Battery module assembly

Abstract

The utility model provides a battery module assembly, which mainly solves the problem that the existing battery module has potential safety hazards. The battery module assembly comprises a battery module, a first heat exchange device and a second heat exchange device, the battery module comprises an outer shell and a plurality of single batteries arranged in the outer shell; the first heat exchange device is positioned in the outer shell and is arranged at the top of each single battery; the first heat exchange device is provided with a heat exchange channel through which an insulated heat exchange medium passes, and the insulated heat exchange medium in the heat exchange channel is in direct contact with the polar terminals of the single batteries for heat exchange; the second heat exchange device is arranged on at least one of the bottom of the outer shell and the side wall of the outer shell and is used for exchanging heat with the outer shell of the battery module. The first heat exchange device and the second heat exchange device simultaneously exchange heat with the polarity terminal and the outer shell of the battery module, so that the temperatures at different positions of the whole battery module are effectively controlled, and the safety of the battery module during use is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery field, concretely relates to a battery module assembly. BACKGROUND

[0002] The existing battery module is composed of a plurality of single batteries in series, so that the battery module has the characteristics of high space utilization, high integration and high energy density. However, due to the high concentration of single batteries in the battery module, a large amount of heat will be generated during charging and discharging, and the heat will gradually increase. If the generated heat is not released in time, the heat will accumulate, causing uneven temperature of the battery module, thereby reducing the service life of the battery module. In severe cases, the thermal balance of the battery module is destroyed, causing safety hazards. SUMMARY

[0003] The utility model provides a kind of battery module assembly, mainly solve the problem that existing battery module exists safety hazard.

[0004] To solve the above problems, the technical scheme provided by the utility model is as follows:

[0005] The battery module assembly provided by the utility model comprises a battery module, a first heat exchange device and a second heat exchange device. The battery module comprises an outer shell and a plurality of single batteries arranged in the outer shell. The first heat exchange device is located in the outer shell and arranged at the top of each single battery. The first heat exchange device is insulated from each single battery. The first heat exchange device has a heat exchange channel through which an insulating heat exchange medium passes. The insulating heat exchange medium in the heat exchange channel directly contacts the polar terminals of each single battery for heat exchange. The second heat exchange device is arranged at least one of the bottom of the outer shell and the side wall of the outer shell for heat exchange with the outer shell of the battery module.

[0006] Further, the first heat exchange device comprises a connecting pipe assembly. Each single battery has a channel passing through the polar terminal. The connecting pipe assembly connects the channels on the polar terminals of adjacent single batteries to form a heat exchange channel. The connecting pipe assembly is insulated from each single battery polar terminal.

[0007] Further, the first heat exchange device comprises a plurality of sub-first heat exchange devices. Each sub-first heat exchange device is arranged at the top of each single battery. The sub-first heat exchange device comprises at least one heat exchange pipe. Each heat exchange pipe has a first channel extending in the x direction and at least one second channel. The polar terminals of each single battery are electrically connected after passing through each sub-first heat exchange device in the z direction. The first channels of the sub-first heat exchange devices of adjacent single batteries are connected to form a heat exchange channel. Part of the structure of each single battery polar terminal is located in the heat exchange channel and directly contacts the insulating heat exchange medium.

[0008] Further, the first heat exchange device comprises at least one heat exchange plate, the heat exchange plate has a first channel extending along the x direction and at least one group of second channels arranged along the x direction, the first channel in the heat exchange plate serves as a heat exchange channel, and each second channel penetrates along the z direction and is communicated with the first channel; the polar terminals of each single battery are electrically connected after penetrating through the second channel in the z direction, and part of the structure of the polar terminals of each single battery is located in the heat exchange channel and directly contacts the insulating heat exchange medium.

[0009] Further, the part of the polar terminals of each single battery contacting the insulating heat exchange medium is provided with a functional structure for increasing the heat exchange area.

[0010] Further, the second heat exchange device comprises at least one liquid cooling plate, and the liquid cooling plate is arranged on the side wall of the outer shell and exchanges heat with the side wall of the outer shell.

[0011] Further, the liquid inlet port and the liquid outlet port of the liquid cooling plate are located on the same side wall of the liquid cooling plate, and the liquid inlet port is located below the liquid outlet port.

[0012] Further, the first heat exchange device and the second heat exchange device are connected in series.

[0013] Further, the outer shell has a blast venting channel, and the blast venting channel covers the blast venting part of each single battery.

[0014] Further, the outer shell comprises a cylinder with two open ends and two end plates sealingly arranged at the open ends of the cylinder, the end plates comprise a first sealing plate and a second sealing plate arranged in parallel, the first sealing plate is used for sealing the open end of the cylinder, and the second sealing plate is used for clamping the single batteries in the x direction.

[0015] Compared with the prior art, the beneficial effects of the technical scheme of the utility model are:

[0016] 1. The utility model adds a first heat exchange device and a second heat exchange device on the battery module, the first heat exchange device mainly exchanges heat with the polar terminals of each single battery in the battery module, can timely lead out the heat of the single battery with relatively concentrated heat, the second heat exchange device mainly exchanges heat with the outer shell of the battery module, and can timely lead out the heat of the outer shell of the battery module. When the battery module works normally, the first heat exchange device, the second heat exchange device, the polar terminals of the battery module and the outer shell all exchange heat, so that the temperature at different positions of the whole battery module is effectively controlled, the performance problems and safety problems caused by the excessively high or low temperature of the battery module are avoided, and the safety of the battery module during use is improved.

[0017] Meanwhile, the first heat exchange device and the battery module adopt a direct heat exchange mode, the first heat exchange device is provided with a heat exchange channel through which the insulating heat exchange medium passes, the insulating heat exchange medium in the heat exchange channel directly contacts the polar terminal of the single battery, and the insulating heat exchange medium directly acts on the polar terminal, so that the insulating heat exchange medium has a shorter heat exchange path, thereby improving the utilization efficiency of the insulating heat exchange medium, improving the heat exchange efficiency of the battery module, improving the temperature control effect of the battery module, and further improving the safety of the battery module during use.

[0018] 2. In the battery module assembly, the first heat exchange device adopts a split structure, that is, each single battery is respectively provided with a sub-first heat exchange device, and the sub-first heat exchange devices of adjacent single batteries are communicated with each other to form a heat exchange channel; the structure of arranging the sub-first heat exchange devices on the single batteries facilitates the installation of the sub-first heat exchange devices and the polar terminals of the single batteries, and also facilitates the sealing of the sub-first heat exchange devices and the polar terminals of the single batteries.

[0019] 3. In the battery module assembly, the first heat exchange device comprises at least one heat exchange plate, the heat exchange plate is used for heat exchange with the polar terminals of all single batteries in the battery module, the first heat exchange device adopts an integrated structure, and compared with the structure of arranging the sub-first heat exchange devices on the single batteries, the integrated structure has better overall sealing performance and is also convenient for processing and manufacturing.

[0020] 4. In the battery module assembly, the functional structure is arranged on the polar terminal of each single battery without affecting the conductivity of the polar terminal, so as to increase the heat exchange area of the polar terminal, and the part provided with the functional structure is located in the first heat exchange device and exchanges heat with the insulating heat exchange medium; compared with the polar terminal without the functional structure, the polar terminal with the functional structure has a larger heat exchange area, and thus better heat exchange effect can be obtained.

[0021] 5. In the battery module assembly, the second heat exchange device is a liquid cooling plate arranged on the side wall of the shell, the liquid cooling plate has a larger heat exchange area when exchanging heat with the side wall of the shell, can better exchange heat with the battery module, and further improves the temperature control effect of the battery module.

[0022] 6. In the battery module assembly, the liquid inlet port and the liquid outlet port of the liquid cooling plate are located on the same side wall of the liquid cooling plate, and the liquid inlet port is located below the liquid outlet port. After the liquid cooling plate is installed, the liquid inlet port of the liquid cooling plate is close to the bottom of the shell, and the liquid outlet port is close to the top of the shell. Since the temperature of the heat exchange medium of the liquid inlet port is lower than that of the liquid outlet port, the heat exchange effect of the liquid cooling plate and the bottom of the shell is greater than that of the top of the shell. At the same time, since the heat of the top of the shell has been treated by the first heat exchange device, the arrangement ensures the balance of heat exchange at different positions of the entire battery module.

[0023] 7. The battery module assembly of the utility model, first heat exchange device and second heat exchange device are connected in series, after series connection, first heat exchange device and second heat exchange device can realize the connection with external temperature control pipeline through less pipeline joint, the installation, disassembly and maintenance of battery module assembly are convenient, and the leakage problem when more pipeline joints is reduced.

[0024] 8. The battery module assembly of the utility model, the shell body has the explosion vent passage, the explosion vent passage can direct and orderly discharge the thermal runaway flue gas generated after each single battery thermal runaway, and the harm generated after battery module thermal runaway is reduced.

[0025] 9. The battery module assembly of the utility model, the shell body adopts the cylinder with two open ends and the end plate arranged at the open end of the cylinder, the shell body with the structure is integrally formed by extrusion, and the pressure bearing performance of the cylinder is good. Meanwhile, the end plate on both sides is convenient for installing the electric connection terminal of the external battery module and the adapter pipe of the external first heat exchange device. In addition, the end plate includes first sealing plate and second sealing plate, the size of the second sealing plate in x direction is adjusted, so that the end plate clamps all single batteries in x direction, prevents each single battery from swelling, and improves the stability of each single battery in the shell body. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structural schematic diagram of the battery module assembly in embodiment 1;

[0027] Figure 2 It is the structural schematic diagram of the battery module in embodiment 1;

[0028] Figure 3 It is the explosion of the battery module in embodiment 1 Figure 1 ;

[0029] Figure 4 It is the explosion of the battery module in embodiment 1 Figure 2 ;

[0030] Figure 5 It is the structural schematic diagram of the shell body provided with the limiting boss in embodiment 1;

[0031] Figure 6 It is the connection schematic diagram of each single battery and electric connection assembly in embodiment 1;

[0032] Figure 7 It is the structural schematic diagram of each single battery provided with first heat exchange device in embodiment 1;

[0033] Figure 8 It is the explosion of each single battery and sub connection pipe connection in embodiment 1;

[0034] Figure 9 Structure schematic diagram of the fixed part provided for the monomer battery polarity terminal in Example 1;

[0035] Figure 10 Schematic diagram of the battery module shell side wall provided with two liquid cooling plates in Example 1;

[0036] Figure 11 Schematic diagram of the battery module shell bottom provided with a liquid cooling plate in Example 1;

[0037] Figure 12 Structure schematic diagram of the battery module shell side wall and bottom both provided with liquid cooling plates in Example 1;

[0038] Figure 13 Structure schematic diagram of the liquid cooling plate in Example 1;

[0039] Figure 14 Structure schematic diagram of the first heat exchange device provided for the top of each monomer battery in Example 2 Figure 1 ;

[0040] Figure 15 Structure schematic diagram of the first heat exchange device provided for the top of each monomer battery in Example 2 Figure 1 ;

[0041] Figure 16 Structure schematic diagram of the first heat exchange device provided for the top of each monomer battery in Example 2 Figure 2 ;

[0042] Figure 17 Structure schematic diagram of the first heat exchange device provided for the top of each monomer battery in Example 2 Figure 2 ;

[0043] Figure 18 Cross-sectional view of the first heat exchange device including two half tubes in Example 2;

[0044] Figure 19 Structure schematic diagram of the first heat exchange device including one half tube in Example 2;

[0045] Figure 20 Cross-sectional view of the first heat exchange device provided for the top of each monomer battery in Example 2 Figure 1 ;

[0046] Figure 21 Cross-sectional view of the first heat exchange device provided for the top of each monomer battery in Example 2 Figure 2 ;

[0047] Figure 22 Structure schematic diagram of the first heat exchange device provided for the top of each monomer battery in Example 3 Figure 1 ;

[0048] Figure 23 Structure diagram of heat exchange plate in embodiment 3 Figure 1 ;

[0049] Figure 24 Structure diagram of each single battery provided with first heat exchange device in embodiment 3 Figure 2 ;

[0050] Figure 25 Structure diagram of heat exchange plate in embodiment 3 Figure 2 .

[0051] Fig. 1 is a battery module, 2 is a first heat exchange device, 3 is a second heat exchange device, 11 is a single battery, 12 is an outer shell, 13 is an electrical connection assembly, 14 is an L-shaped connecting rib, 111 is a polarity terminal, 112 is a channel, 113 is a fixing part, 114 is a heat conduction rib plate, 115 is a blast releasing part, 116 is a blast releasing branch pipe, 117 is a functional structure, 121 is a cylinder, 122 is an end plate, 123 is a blast releasing mechanism, 1211 is a limiting boss, 1221 is a first sealing plate, 1222 is a second sealing plate, 131 is a first electrical connection piece, 132 is a second electrical connection piece, 133 is an electrical connection terminal, 21 is an adapter pipe, 22 is a sub-connection pipe, 23 is a heat exchange pipe fitting, 24 is a heat exchange plate, 25 is a first channel, 26 is a second channel, 27 is an O-shaped sealing ring, 31 is a liquid cooling plate, 311 is an inlet port, 312 is an outlet port, 313 is a partition plate. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purpose, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0053] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0054] In the description of the utility model, it is necessary to explain that the position or position relation of the terms such as top, bottom is based on the position or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model. In addition, the terms "first, second, third, etc." are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0055] The existing battery module is composed of a plurality of single batteries electrically connected, so that the battery module has the characteristics of high integration and high energy density. In order to improve the safety of the battery module in use, the battery module is generally provided with a heat management device, which processes the heat of the battery module shell or the heat at the polarity terminal of the battery module. This single processing method cannot timely process the heat generated at different positions of the entire battery module, and the temperature control effect of the battery module is poor.

[0056] The utility model discloses a battery module is provided with first heat exchange device and second heat exchange device. The first heat exchange device mainly exchanges heat with the polarity terminal of each single battery in the battery module, and can timely export the heat of the single battery polarity terminal with relatively concentrated heat. The second heat exchange device mainly exchanges heat with the shell of the battery module, and can timely export the heat at the shell of the battery module. When the battery module is working normally, the first heat exchange device and the second heat exchange device exchange heat with the polarity terminal and the shell of the battery module at the same time, effectively avoiding the heat accumulation between each single battery in the shell of the battery module, realizing the balanced heat dissipation of each single battery in the battery module, making the temperature of different positions and different areas of the entire battery module be effectively controlled, avoiding the performance problems and safety problems caused by the excessively high or low temperature of the battery module, and improving the safety of the battery module in use.

[0057] More importantly, the first heat exchange device and the battery module adopt a direct heat exchange mode. The first heat exchange device is provided with a heat exchange channel through which an insulating heat exchange medium passes. The insulating heat exchange medium in the heat exchange channel directly contacts the polarity terminal of the single battery, that is, part of the structure of the polarity terminal is directly placed in the first heat exchange device, so that the polarity terminal directly contacts the insulating heat exchange medium, and the insulating heat exchange medium directly acts on the polarity terminal of each single battery. Compared with the indirect heat exchange mode, the direct heat exchange mode has a shorter heat exchange path, improves the utilization efficiency of the insulating heat exchange medium, improves the heat exchange efficiency of the battery module, and can further improve the safety of the battery module in use.

[0058] Example 1

[0059] As Figures 1 to 4As shown, the embodiment provides a battery module assembly, which comprises a battery module 1, a first heat exchange device 2 and a second heat exchange device 3. The battery module 1 comprises an outer shell 12 and a plurality of single batteries 11, the number of which can be adjusted according to actual needs. The plurality of single batteries 11 are arranged in the outer shell 12 and connected in series through an electrical connection assembly 13. Meanwhile, the outer shell 12 is insulated from each single battery 11. The insulation mode can be that an insulation layer is arranged on the inner wall of the outer shell 12, or an insulation layer is added to the shell of each single battery 11, or an insulation pad is added between the single battery 11 and the outer shell 12, etc. The first heat exchange device 2 is located in the outer shell 12 and mainly exchanges heat with the polar terminals 111 of each single battery 11 in the battery module 1. The second heat exchange device 3 is located outside the outer shell 12 and mainly exchanges heat with the outer shell 12 of the battery module 1.

[0060] For ease of description, the arrangement direction of the single battery 11 is defined as the x direction, the height direction of the single battery 11 is defined as the z direction, and the direction perpendicular to the x direction and the z direction is defined as the y direction.

[0061] As shown in Figure 4 , Figure 5 and Figure 6 , the plurality of single batteries 11 are connected in series through the electrical connection assembly 13 in the outer shell 12. The electrical connection assembly 13 in the embodiment comprises a first electrical connection member 131 and a second electrical connection member 132. The first electrical connection member 131 is located in the outer shell 12 and used to realize the series connection between each single battery 11 in the battery module 1. The second electrical connection member 132 realizes the electrical connection between the battery module 1 and external equipment. Each single battery 11 can be connected in series through the following modes:

[0062] First, the positive polarity terminals of each single battery 11 are located on the same side, and the negative polarity terminals are located on the other side. The polarity terminals 111 of different polarity of adjacent single batteries 11 are connected through the first electrical connection member 131 arranged obliquely. One of the polarity terminals 111 of the first and last single batteries 11 is connected with one second electrical connection member 132. The two second electrical connection members 132 pass through the outer shell 12 and are respectively used as the electrical connection terminals 133 (two electrical connection terminals 133 are respectively used as the total positive and total negative of the battery module 1) of the battery module 1.

[0063] Second, the adjacent single battery 11 is located at the same side of the polarity terminal 111, that is, the positive polarity terminal of one of the adjacent two single batteries 11 and the negative polarity terminal of the other single battery 11 are located at the same side of the battery module 1; at this time, the polarity terminals 111 of the adjacent two single batteries 11 located at the same side are opposite in polarity, and the polarity terminals 111 of different polarities of the adjacent single batteries 11 are electrically connected through the first electrical connection 131 arranged along the arrangement direction of the single battery 11; one of the polarity terminals 111 of the first and last two single batteries 11 is connected with a second electrical connection 132, and the two second electrical connections 132 pass through the outer shell 12 and are respectively used as the electrical connection terminals 133 (the two electrical connection terminals 133 are respectively used as the total positive and total negative of the battery module 1) externally connected to the battery module 1.

[0064] The first electrical connection 131 is generally an electrical connection plate, which is electrically connected with the polarity terminal 111 of each single battery 11, and can be welded on the polarity terminal 111 of each single battery 11, or can also be fixed on the polarity terminal 111 of each single battery 11 by screws.

[0065] The second electrical connection 132 is two, which is electrically connected with the polarity terminal 111 of the single battery 11 at both ends of the battery module 1, and then passes through the outer shell 12 and is used as the electrical connection terminal 133 externally connected to the entire battery module 1. The outer shell 12 is provided with a through hole through which the second electrical connection 132 passes, and after the second electrical connection 132 passes through the outer shell 12, it is used as the electrical connection terminal 133 for electrically connecting the entire battery module 1 with external equipment.

[0066] When the second electrical connection 132 passes through the outer shell 12 as the externally connected electrical connection terminal 133, it needs to be insulated from the outer shell 12, which can be specifically insulated by insulating the non-electrically connected part of the second electrical connection 132, such as spraying insulating paint, wrapping insulating film, etc.; the inner wall of the through hole through which the second electrical connection 132 passes through the outer shell 12 can also be insulated, such as spraying insulating paint, etc.; an insulating sleeve can also be added between the outer shell 12 and the second electrical connection 132; of course, for safety, multiple insulation methods can be combined to achieve insulation between the second electrical connection 132 and the outer shell 12.

[0067] As Figure 2 , Figure 3 and Figure 4As shown, the outer shell 12 in the embodiment mainly integrates and installs each single battery 11, and also protects each single battery 11. Different from the outer shell of the general battery module 1, the outer shell 12 in the utility model can bear certain pressure, and when each single battery 11 is in thermal runaway, the outer shell 12 can ensure that the thermal runaway smoke gas cannot leak from the outer shell 12, thereby avoiding the harm to the devices near the battery module 1.

[0068] As shown in the figure, Figure 2 In order to further improve the safety of the battery module 1, the above-mentioned outer shell 12 is provided with a pressure relief mechanism 123, and the thermal runaway smoke gas in the outer shell 12 is discharged from the outer shell 12 through the pressure relief mechanism 123. The pressure relief mechanism 123 specifically includes a pressure relief pipe and a pressure relief part, the pressure relief pipe is connected with the pressure relief port of the outer shell 12, and the pressure relief part is arranged on the pressure relief pipe or the pressure relief port of the outer shell 12. The pressure relief part can be a pressure relief membrane or a pressure relief valve. The pressure relief mechanism 123 can ensure that when the single battery 11 in the outer shell 12 is in thermal runaway, the thermal runaway smoke gas in the outer shell 12 can be discharged in an orderly manner, thereby avoiding the safety hazards such as explosion in the outer shell 12 of the battery module 1.

[0069] The shape and size of the above-mentioned outer shell 12 can be designed as a shape convenient for placement according to the application scene of the battery module 1, and the structure of the outer shell 12 is as follows:

[0070] First, as shown in the figure, Figure 4 The outer shell 12 is a rectangular shell, which includes a cylinder 121 with a top opening and a top plate sealingly arranged at the top opening end of the cylinder 121. The top of the cylinder 121 is open, and after each single battery 11 is placed in the cylinder 121, the top plate is sealingly fixed (welded) to the open end of the top of the cylinder 121. The outer shell 12 of this structure has good pressure bearing property, the cylinder 121 can be integrally formed by extrusion process, so that the pressure bearing property of the cylinder 121 is good, and the structure of the top opening is convenient for the assembly of the top heat exchange channel of each single battery 11 and the electrical connection of each single battery 11.

[0071] Second, as shown in the figure, Figure 3 The outer shell 12 is a rectangular shell, which includes a cylinder 121 with two open ends and an end plate 122 covering the open end of the cylinder 121. The front and rear of the cylinder 121 are both open, one of the end plates 122 is sealingly fixed (welded) to the open end of the front of the cylinder 121, and the other end plate 122 is sealingly fixed (welded) to the open end of the rear of the cylinder 121. The outer shell 12 of this structure has good pressure bearing property, the cylinder 121 can be integrally formed by extrusion process, so that the pressure bearing property of the cylinder 121 is good, and the end plates 122 on both sides are convenient for installing the electrical connection terminals of the battery module and the adapter pipe connected with the first heat exchange device.

[0072] As Figure 5 shown, the top plate of the barrel 121 is provided with a limiting boss 1211 for limiting the height of each single battery 11. The limiting boss 1211 limits each single battery 11 in the z direction, so that each single battery 11 is stably and reliably installed in the outer shell 12, improving the stability of each single battery 11 in the outer shell 12, avoiding shaking and friction between each single battery 11 and the outer shell 12 during transportation or in a moving environment, and reducing the probability of thermal runaway of the battery module 1.

[0073] As Figure 3 shown, the end plate 122 is mainly used to seal the open end of the barrel 121. The end plate 122 is provided with a venting mechanism 123. The thermal runaway smoke in the outer shell 12 is discharged out of the outer shell 12 through the venting mechanism 123, thereby reducing the harm caused by thermal runaway of the battery module 1. The end plate 122 in this embodiment includes a first sealing plate 1221 and a second sealing plate 1222. The first sealing plate 1221 is used to seal the open end of the barrel, and the second sealing plate 1222 is used to clamp the single batteries in the x direction. By adjusting the size of the second sealing plate 1222 in the x direction, the end plate 122 clamps all single batteries 11 in the x direction, preventing each single battery 11 from swelling and improving the stability of each single battery 11 in the outer shell 12. In other embodiments, the end plate 122 can also be realized by one sealing plate.

[0074] In addition, in order to improve the pressure-bearing capacity of the entire outer shell 12, two electrical connection terminals 133 can be additionally fixed on the outer shell 12 as the total positive and total negative of the battery module 1. The two second electrical connections 132 are respectively and correspondingly electrically connected with the two electrical connection terminals 133. When the electrical connection terminals 133 are arranged on the end plate 122 of the outer shell 12, the second electrical connections 132 need to have a certain flexibility to be able to be bent in the outer shell 12. During assembly, first, the second electrical connections 132 are electrically connected with the polarity terminals 111 of the single batteries 11, and then the end plate 122 is placed near the open end of the barrel 121, and the second electrical connections 132 are correspondingly electrically connected with the two electrical connection terminals 133. Since the second electrical connections 132 are flexible and can be bent in the outer shell 12, after the second electrical connections 132 are connected with the electrical connection terminals 133, the sealing connection between the end plate 122 and the barrel 121 can be finally performed.

[0075] As Figure 1As shown, in order to enable the above-mentioned battery module 1 to work safely and reliably, the first heat exchange device 2 and the second heat exchange device 3 are additionally arranged on the above-mentioned battery module 1. The first heat exchange device 2 mainly exchanges heat with the polar terminals 111 of each battery module 1, and timely leads out the heat on the polar terminals 111 which are relatively concentrated in heat, and is mainly used for controlling the temperature of the top of the battery module 1, especially the part of the polar terminals 111 of the battery module 1. The second heat exchange device 3 mainly exchanges heat with the outer shell 12 of each battery module 1. The first heat exchange device 2 and the second heat exchange device 3 are used in cooperation, so that the temperature of different positions and different areas of the whole battery module 1 is effectively controlled, and the battery module 1 is ensured to operate in the optimal temperature range, and the safety of the battery module 1 during use is improved.

[0076] When the above-mentioned first heat exchange device 2 is installed, it is arranged in the outer shell 12 and located at the top of each single battery 11, and meanwhile, the first heat exchange device 2 is insulated from each single battery 11, and the insulation here specifically refers to the insulation of the part of the first heat exchange device 2 in contact with the polar terminals 111 and the shell of the single battery 11.

[0077] The first heat exchange device 2 has a heat exchange channel through which an insulating heat exchange medium passes, and the insulating heat exchange medium in the heat exchange channel directly contacts the polar terminals 111 of each single battery 11 to exchange heat. The insulating heat exchange medium is introduced into the above-mentioned heat exchange channel, so that the insulating heat exchange medium directly contacts the polar terminals 111 to realize the temperature control of the battery module 1. When the temperature of the battery module 1 is higher than the set threshold value, the insulating heat exchange medium with lower temperature is introduced into the heat exchange channel to cool the battery module 1; when the temperature of the battery module 1 is lower than the set threshold value, the insulating heat exchange medium with higher temperature is introduced into the heat exchange channel to heat the battery module 1; by controlling the temperature of the insulating heat exchange medium, the battery module 1 can be ensured to always operate at the normal working temperature.

[0078] The first heat exchange device 2 and the heat exchange channel in the embodiment are realized by the following structure:

[0079] As shown in Figure 7 and Figure 8 The first heat exchange device 2 includes a connecting pipe assembly, the polar terminals 111 of each single battery 11 are provided with channels 112 penetrating through the polar terminals 111 along the x direction, the connecting pipe assembly connects the channels 112 on the polar terminals 111 of adjacent single batteries 11 to form a heat exchange channel, and meanwhile, the connecting pipe assembly is insulated from the polar terminals 111 of each single battery 11.

[0080] The polar terminal 111 described herein can be a monomer battery 11 pole, and when the monomer battery 11 pole height does not meet the set requirements, a pole adapter can also be connected to the monomer battery 11 pole, and the monomer battery 11 pole and the pole adapter are matched as a whole structure of the monomer battery 11 polar terminal 111. The polar terminal 111 of the embodiment is the pole of the monomer battery 11, which is higher in height than the conventional monomer battery 11 pole.

[0081] The shape of the polar terminal 111 of each monomer battery 11 is not limited in the embodiment, and the cross section can be square, circular, etc. At the same time, the cross section of the channel 112 is also not limited, and a channel 112 with a relatively regular structure such as a circular or square cross section can be generally used. In addition, the cross-sectional area of the channel 112 of the embodiment is not too large, provided that it does not affect the conductivity of the polar terminal 111; the cross-sectional area of the channel 112 is also not too small, so that the heat exchange area is too small to affect the heat exchange effect. The cross-sectional area of the channel 112 can be increased as much as possible under the premise of not affecting the conductivity of the polar terminal 111, so as to increase the heat exchange area and improve the heat exchange effect.

[0082] As shown in Figure 7 and Figure 8 It can be seen that the connecting pipe assembly of the embodiment includes a plurality of sub-connecting pipes 22; the two ends of each sub-connecting pipe 22 are connected with the channels 112 of the polar terminals 111 of the adjacent monomer batteries 11 located on the same side, forming two heat exchange channels at the top of each monomer battery 11. At the same time, the sub-connecting pipe 22 is used to connect the channels 112 of the two polar terminals 111 of one outermost monomer battery 11 in the battery module 1, realizing the series connection of the two heat exchange channels, forming a U-shaped heat exchange channel, and the free ends (herein, the free end refers to the port of the channel 112 without connecting the sub-connecting pipe 22) of the channels 112 of the two polar terminals 111 of the other outermost monomer battery 11 can be directly used as the two ports of the U-shaped heat exchange channel, and the two ports of the U-shaped heat exchange channel are used as the liquid inlet end and the liquid outlet end, respectively.

[0083] In other embodiments, the two heat exchange channels can be connected in parallel, that is, the ports located on one side of the two heat exchange channels are used as the liquid inlet end, and the ports located on the other side of the two heat exchange channels are used as the liquid outlet end.

[0084] As shown in Figure 7 and Figure 8As shown, the present embodiment also connects an adapter pipe 21 on the channel 112 of the polar terminal 111 as the inlet end and outlet end of the heat exchange channel, and connects with the external temperature control pipeline through the adapter pipe 21. When the adapter pipe 21 is installed, it is connected with the external temperature control pipeline through the shell 12. In order to further ensure the pressure bearing performance of the shell 12, the adapter pipe 21 is integrally connected to the end plate 122, for example, the adapter pipe 21 can be welded to the end plate 122. At the same time, the non-connection part of the adapter pipe 21 (here, the non-connection part can be understood as the middle section of the adapter pipe 21) has a certain flexibility. Based on the deformation of the adapter pipe 21, the adapter pipe 21 can be connected with the end plate 122 and the polar terminal 111 respectively, and the adapter pipe 21 can also be sealed and connected with the channel 112 on the corresponding polar terminal 111.

[0085] As shown in Figure 8 When the sub-connection pipe 22 is made of a hard material pipe section, the channels 112 on the polar terminals 111 of the adjacent single batteries 11 must be coaxial in order to achieve effective connection. However, in some cases, due to the existence of machining errors, it is difficult to ensure the coaxiality of the channels 112 on the polar terminals 111 of the adjacent single batteries 11, therefore, the non-connection part of the sub-connection pipe 22 (here, the non-connection part is the part of the sub-connection pipe 22 that is not connected with the port of the channel 112, and can also be understood as the middle section of the sub-connection pipe 22) is preferably flexible. Based on the deformation of the sub-connection pipe 22, the above machining errors are overcome, and the sub-connection pipe 22 is sealed and connected with the port of the corresponding channel 112.

[0086] In addition, in order to make the connection of the polar terminal 111 of each single battery 11 and the sub-connection pipe 22 more reliable, a fixing part 113 can also be provided on the side wall of the above-mentioned polar terminal 111. The fixing part 113 can adopt the following structure:

[0087] First, the fixing part 113 is an annular boss integrally formed on the side wall of the polar terminal 111 and protruding from the side wall of the polar terminal 111, and the channel 112 passes through the annular boss;

[0088] As shown in Figure 9 The annular boss includes a first annular boss, and the outer wall circumferential dimension of the first annular boss is adapted to the inner wall circumferential dimension of the sub-connection pipe 22, that is, the outer wall circumferential dimension of the first annular boss is consistent with or slightly smaller than the inner wall circumferential dimension of the sub-connection pipe 22;

[0089] When connected, the sub-connection pipe 22 is sleeved on the outer wall of the first annular boss to realize the communication of the passages 112 between the single batteries 11. Specifically, the sub-connection pipe 22 can be sleeved on the first annular boss through interference fit. The fixing part 113 of this structure can increase the heat exchange area through which the insulating heat exchange medium passes, and also facilitates quick and reliable connection with the sub-connection pipe 22.

[0090] b. The annular boss comprises a second annular boss, the inner wall circumferential dimension of the second annular boss is adapted to the outer wall circumferential dimension of the sub-connection pipe 22, that is, the inner wall circumferential dimension of the second annular boss is consistent with or slightly smaller than the outer wall circumferential dimension of the sub-connection pipe 22;

[0091] When connected, the sub-connection pipe 22 is embedded into the inner wall of the second annular boss to realize the communication of the passages 112 between the single batteries 11. Specifically, the sub-connection pipe 22 can be inserted into the second annular boss through interference fit;

[0092] c. The annular boss comprises a first annular boss and a second annular boss, the outer wall circumferential dimension of the first annular boss is adapted to the inner wall circumferential dimension of the sub-connection pipe 22, and the inner wall circumferential dimension of the second annular boss is adapted to the outer wall circumferential dimension of the sub-connection pipe 22;

[0093] When connected, the sub-connection pipe 22 is clamped in the annular groove between the first annular boss and the second annular boss. At this time, the inner wall of the sub-connection pipe 22 is in contact with the outer wall of the first annular boss, and the outer wall of the sub-connection pipe 22 is in contact with the inner wall of the second annular boss. The fixing part 113 of this structure can fix the inner wall and the outer wall of the sub-connection pipe 22 at the same time, improve the stability of the connection between the sub-connection pipe 22 and the polar terminal 111, and at the same time, the fixing part 113 of this structure forms multiple sealed contact surfaces between the sub-connection pipe 22 and the fixing part 113, further improving the sealing and reliability of the connection.

[0094] Second, the fixing part 113 is a third annular groove arranged on the side wall of the polar terminal 111;

[0095] The third annular groove is similar in shape to the sub-connection pipe 22, and the groove width of the third annular groove is consistent with or slightly smaller than the wall thickness of the sub-connection pipe 22. The groove width of the third annular groove specifically refers to the radial dimension of the third annular groove. When connected, the end of the sub-connection pipe 22 is embedded in the third annular groove. Compared with the structure in which the fixing part 113 is an annular boss, the fixing part 113 of this structure can be machined on the existing polar terminal 111, reducing the manufacturing cost of the polar terminal 111.

[0096] In addition, since the heat exchange channel is filled with insulating heat exchange medium, the sealing performance of the heat exchange channel is particularly important. In order to ensure the sealing performance of the heat exchange channel, the sub-connection pipe 22 and the fixed part 113 of the corresponding polarity terminal 111 are connected in an interference fit manner. In other embodiments, a sealing ring can be additionally arranged between the two to further improve the sealing performance of the connection part. When the sub-connection pipe 22 is made of metal, the connection and sealing between the polarity terminal 111 and the sub-connection pipe 22 can also be achieved by welding. However, attention should be paid to the insulation between the polarity terminal 111 and the sub-connection pipe 22.

[0097] As shown in Figure 9 In order to further optimize the heat exchange effect, the functional structure 117 can be arranged in the channel 112. The functional structure can increase the heat exchange area of the polarity terminal 111 without affecting the conductivity of the polarity terminal 111. The functional structure 117 can be a point-shaped protrusion or a point-shaped recess arranged on the inner wall of the channel 112. In the embodiment, the functional structure is a plurality of heat-conducting rib plates 114. The plurality of heat-conducting rib plates 114 are uniformly distributed along the circumference of the channel 112, and each heat-conducting rib plate 114 extends along the axis of the channel 112. The heat-conducting rib plate 114 can increase the contact area between the insulating heat exchange medium and the polarity terminal 111, i.e., increase the heat exchange area, thereby effectively improving the heat exchange effect. In other embodiments, the number and arrangement of the heat-conducting rib plates 114 can be adjusted according to the size of the channel 112, as long as the flow of the insulating heat exchange medium is not affected.

[0098] It should be noted that:

[0099] 1. Since the polarity terminal 111 directly contacts the insulating heat exchange medium, the ideal insulating heat exchange medium should have good insulation, high specific heat capacity and thermal conductivity, good flame retardant performance, low cost, suitable working temperature, long service life, no corrosion, etc. In the embodiment, the insulating heat exchange medium is a common insulating heat exchange medium in the prior art, which can be but is not limited to insulating oil and fluorinated liquid.

[0100] 2. Since the sub-connection pipe 22 directly contacts the polarity terminal 111, the sub-connection pipe 22 and the two polarity terminals 111 connected thereto must be insulated. The insulation can be achieved in the following ways:

[0101] 2.1. Selecting an insulating material for the sub-connection pipe 22;

[0102] 2.2, the sub-connection pipe 22 is made of non-insulating material, the wall of the sub-connection pipe 22 can be insulated, such as spraying insulating paint, wrapping insulating film, etc.; the inner wall of the channel 112 connected with the sub-connection pipe 22 can also be insulated, such as spraying insulating paint, etc.; an insulating sleeve can also be added between the sub-connection pipe 22 and the channel 112; of course, in order to be safe, multiple insulation methods can be combined to achieve the insulation between the channel 112 and the sub-connection pipe 22 and the polarity terminal 111.

[0103] 2.3, if the outer shell 12 is made of metal material, the insulation between the adapter pipe 21 and the polarity terminal 111 also needs to be realized, which can be realized by similar insulation methods as the sub-connection pipe 22.

[0104] When the above battery module 1 is assembled, first, a plurality of single batteries 11 are arranged in the same direction, the connection pipe assembly connects the channels 112 on the polarity terminals 111 of adjacent single batteries 11 to form a heat exchange channel; then, the electrical connection assembly 13 realizes the electrical connection between the single batteries 11; secondly, each single battery 11 is pushed into the inner cavity of the cylinder body 121 from the side of the cylinder body 121, the adapter pipe 21, the second electrical connection 132 and the two side end plates 122 are connected, after the adapter pipe 21, the second electrical connection 132 and the end plate 122 are insulated and sealed, finally, the end plate 122 and the cylinder body 121 are sealed.

[0105] After the first heat exchange device 2 and the battery module 1 are assembled, the second heat exchange device 3 is arranged on the outer shell 12 of the battery module 1, the second heat exchange device 3 is arranged at least one of the bottom of the outer shell 12 and the side wall of the outer shell 12, and contacts the bottom or the side wall of the outer shell 12 to exchange heat, and processes the heat generated by the outer shell 12 of the battery module 1.

[0106] As shown in Figure 1 , Figures 10 to 12 The second heat exchange device 3 in the embodiment includes at least one liquid cooling plate 31, which can exchange heat with the side wall of the outer shell 12, the bottom plate of the outer shell 12, or both the side wall and the bottom plate of the outer shell 12. The side wall of the outer shell 12 refers to the side wall parallel to the xz plane, and the bottom plate of the outer shell 12 refers to the xy plane.

[0107] Preferably, the liquid cooling plate 31 exchanges heat with the side wall of the outer shell 12. When the liquid cooling plate 31 exchanges heat with the side wall of the outer shell 12, the heat exchange area is large, which can further improve the temperature control effect of the battery module 1. At the same time, the liquid cooling plate 31 is arranged on the side wall of the outer shell 12. The liquid cooling plate 31 can also inhibit the deformation of the outer shell 12 of the battery module 1 due to expansion, avoid the safety hazards such as leakage, internal short circuit and thermal runaway caused by the bulging deformation of the outer shell 12, and improve the safety and reliability of the battery module 1.

[0108] As shown in Figure 1 , Figure 12 and Figure 13 , since the side wall of the outer shell 12 is rectangular, the liquid cooling plate 31 in the embodiment is a rectangular liquid cooling plate which is attached to the side wall of the outer shell 12 and exchanges heat with the side wall of the outer shell 12. Two ports are arranged on the side wall of the liquid cooling plate 31, which are respectively an inlet port 311 and an outlet port 312. The heat exchange medium enters the inside of the liquid cooling plate 31 through the inlet port 311, exchanges heat with the outer shell 12, and then is discharged from the outlet port 312. The inlet port 311 and the outlet port 312 can be arranged on different side walls of the liquid cooling plate 31, or can be arranged on the same side wall of the liquid cooling plate 31. If the inlet port 311 and the outlet port 312 are located on the same side wall of the liquid cooling plate 31, a partition plate 313 is arranged in the chamber of the liquid cooling plate 31, which divides the inside of the liquid cooling plate 31 into a U-shaped flow channel. The inlet port 311 and the outlet port 312 are respectively communicated with the U-shaped flow channel.

[0109] As shown in Figure 13 , in the embodiment, the inlet port 311 and the outlet port 312 of the liquid cooling plate 31 are arranged on the same side wall of the liquid cooling plate 31, and the inlet port 311 is located below the outlet port 312. After the liquid cooling plate 31 is installed, the inlet port 311 of the liquid cooling plate 31 is close to the bottom of the outer shell 12, and the outlet port 312 is close to the top of the outer shell 12. Since the temperature of the heat exchange medium of the inlet port 311 is lower than that of the outlet port 312, the heat exchange effect of the liquid cooling plate 31 on the bottom of the outer shell 12 is greater than that on the top of the outer shell 12. At the same time, since the heat at the top of the battery module 1 has been treated by the first heat exchange device 2, this arrangement improves the uniformity of the temperature at different positions of the entire battery module 1.

[0110] In order to improve the support strength of the liquid cooling plate 31, the liquid cooling plate 31 in this embodiment is preferably made of metal. When the outer shell 12 is electrified, insulation should be ensured between the liquid cooling plate 31 and the outer shell 12. Generally, the outer shell 12 or the liquid cooling plate 31 can be insulated, for example, a layer of insulating material can be coated on the surface of the outer shell 12 or the liquid cooling plate 31, or the surface of the outer shell 12 or the liquid cooling plate 31 can be sprayed with insulating paint, or an insulating pad can be added between the two, or the liquid cooling plate 31 can be made of a relatively hard insulating material, but the support strength of the liquid cooling plate 31 should be ensured.

[0111] When the liquid cooling plate 31 is installed, the liquid cooling plate 31 can be fixed to the side wall of the outer shell 12 by screw connection or adhesion. If adhesion is selected, the adhesion of the heat-conducting glue with good heat-conducting performance is preferred.

[0112] In this embodiment, the first heat exchange device 2 and the second heat exchange device 3 can also be connected in series, that is, the adapter pipe 21 at the liquid outlet end of the first heat exchange device 2 is communicated with the liquid inlet port 311 of the liquid cooling plate 31, or the adapter pipe 21 at the liquid inlet end of the first heat exchange device 2 is communicated with the liquid outlet port 312 of the liquid cooling plate 31. After being connected in series, the first heat exchange device 2 and the second heat exchange device 3 can be connected to the external temperature control pipeline through fewer pipeline joints, which is convenient for the installation, disassembly and maintenance of the battery module assembly, and also reduces the leakage problem caused by too many pipeline joints.

[0113] In other embodiments, the first heat exchange device 2 and the second heat exchange device 3 can also be connected in parallel, that is, the first heat exchange device 2 and the second heat exchange device 3 are respectively connected to the external temperature control pipeline.

[0114] The first heat exchange device 2 and the second heat exchange device 3 exchange heat at different positions of the battery module 1. After the heat exchange medium absorbs heat in the first heat exchange device 2 and the second heat exchange device 3, it is transmitted to the external heat treatment device through the temperature control pipeline for treatment. The heat treatment device is a device with heating and / or cooling functions, which is used to heat or cool the heat exchange medium. For example, the heat treatment device is specifically a heater, a cooler, or a refrigeration machine with a compressor, a water chiller, etc.

[0115] The heat exchange medium in the first heat exchange device 2 is an insulating heat exchange medium, and the heat exchange medium in the second heat exchange device 3 is also an insulating heat exchange medium. Therefore, the same set of temperature control pipelines can be used to connect the first heat exchange device 2 and the second heat exchange device 3. At this time, the first heat exchange device 2 and the second heat exchange device 3 can be connected in series or in parallel.

[0116] If the heat exchange medium in the second heat exchange device 3 is a non-insulating heat exchange medium, and the heat exchange medium in the first heat exchange device 2 is an insulating heat exchange medium, at this time, the first heat exchange device 2 and the second heat exchange device 3 are filled with different heat exchange media, different temperature control pipelines and different heat treatment devices are used to connect the first heat exchange device 2 and the second heat exchange device 3 respectively, at this time, the first heat exchange device 2 and the second heat exchange device 3 cannot be connected in series, but can only be connected in parallel.

[0117] Embodiment 2

[0118] The battery module assembly in this embodiment is similar in structure to the battery module assembly in Embodiment 1. The first heat exchange device 2 of the battery module 1 in this embodiment is different from that in Embodiment 1. The first heat exchange device 2 in the battery module 1 in this embodiment is realized by the following structure:

[0119] As shown in Figure 14 and Figure 16 , the first heat exchange device 2 in this embodiment includes a plurality of sub-first heat exchange devices, the top of each single battery 11 is respectively provided with a sub-first heat exchange device, the sub-first heat exchange devices of adjacent single batteries 11 are communicated to form a heat exchange channel, and the polarity terminals 111 of each single battery 11 are electrically connected with the electrical connection assembly 13 after penetrating the sub-first heat exchange device at the top thereof in the z direction. Part of the structure of the polarity terminal 111 of the single battery 11 is located in the heat exchange channel and directly contacts with the insulating heat exchange medium. The sub-first heat exchange device is insulated from the adjacent single battery 11. Here, the insulation specifically refers to the insulation between the sub-first heat exchange device and the part of the single battery 11 that contacts with the polarity terminal 111 and the shell of the single battery 11. After the battery module 1 is constructed based on such single batteries 11, the sub-first heat exchange devices of each single battery 11 can be communicated to form a heat exchange channel at the top of the battery module 1, and the battery module 1 can be heat exchanged.

[0120] The specific structure of the sub-first heat exchange device in this embodiment will be described in detail below with reference to the accompanying drawings.

[0121] a. As shown in Figure 14 and Figure 15 , the sub-first heat exchange device includes two heat exchange pipe fittings 23 arranged along the y direction, each heat exchange pipe fitting 23 is provided with a first channel 25 and a second channel 26; the first channel 25 penetrates along the x direction; the second channel 26 penetrates along the z direction and is communicated with the first channel 25; the two polarity terminals 111 of each single battery 11 are respectively electrically connected with the electrical connection assembly 13 after penetrating the second channels 26 of the two heat exchange pipe fittings 23, and the two ports of the second channel 26 are sealed from the polarity terminals 111.

[0122] b. As shown in Figure 16 and Figure 17As shown in the figure, the sub first heat exchange device includes one heat exchange pipe 23, each heat exchange pipe 23 is provided with a first channel 25 and two second channels 26 arranged along the y direction; the first channel 25 penetrates along the x direction; the second channel 26 penetrates along the z direction and is communicated with the first channel 25; the two polar terminals 111 of each single battery 11 correspondingly pass through the two second channels 26 on the heat exchange pipe 23 and are electrically connected with the electrical connection assembly 13, and the two ports of the second channel 26 are sealed with the polar terminals 111;

[0123] c、as shown in the figure, Figure 18 As shown in the figure, the sub first heat exchange device includes two heat exchange pipes 23 arranged along the y direction, the heat exchange pipe 23 is a half pipe, which can be understood as being divided into two halves along the axial direction of the whole pipe, each half is a half pipe, and the half pipe is buckled and sealed and fixed on the upper cover plate of the single battery 11, each heat exchange pipe 23 is provided with a first channel 25 and a second channel 26; the first channel 25 penetrates along the x direction; the second channel 26 penetrates along the z direction and is communicated with the first channel 25; the two polar terminals 111 of each single battery 11 correspondingly pass through the second channels 26 on the two heat exchange pipes 23 and are electrically connected with the electrical connection assembly 13, and one port of the second channel 26 is sealed with the polar terminal 111.

[0124] d、as shown in the figure, Figure 19 As shown in the figure, the sub first heat exchange device includes one heat exchange pipe 23, the heat exchange pipe 23 is a half pipe, and the half pipe is buckled and sealed and fixed on the upper cover plate of the single battery 11, each heat exchange pipe 23 is provided with a first channel 25 and two second channels 26 arranged along the y direction; the first channel 25 penetrates along the x direction; the second channel 26 penetrates along the z direction and is communicated with the first channel 25; the two polar terminals 111 of each single battery 11 correspondingly pass through the two second channels 26 on the heat exchange pipe 23 and are electrically connected with the electrical connection assembly 13, and one port of the second channel 26 is sealed with the polar terminal 111.

[0125] When the battery module 1 is installed, the heat exchange pipes 23 of the adjacent single batteries 11 are communicated with each other, the cavity of the sub first heat exchange device after being communicated is used as a heat exchange channel, and heat exchange between the single batteries 11 is realized. The cross-sectional shape of the heat exchange pipe 23 is not limited in the utility model, since the heat exchange pipe 23 in the embodiment is arranged on the top of the single battery 11 in a planar shape, considering the structural regularity, the heat exchange pipe 23 in the embodiment is a rectangular pipe or a rectangular half pipe. In other embodiments, a circular pipe or a pipe with other structures can also be used.

[0126] The first channel 25 is a channel formed along the length direction of the heat exchange pipe 23, and the two ends of the first channel 25 are respectively used as the inlet end and the outlet end of the heat exchange pipe 23. The second channel 26 is used for the partial structure of the polarity terminal 111 to pass through, and in the embodiment, the second channel 26 is perpendicular to the first channel 25. In addition, in the z direction (the height direction of the single battery 11), the size of the second channel 26 is smaller than the size of the corresponding polarity terminal 111, so that the top of the polarity terminal 111 can be used as the electrical connection part and extend out of the second channel 26.

[0127] The port shape of the second channel 26 in the embodiment is matched with the cross-sectional shape of the polarity terminal 111, the port of the second channel 26 is circular, the cross section of the polarity terminal 111 is also circular, and the diameter of the two ports of the second channel 26 is slightly larger than the outer diameter of the polarity terminal 111; in other embodiments, the shape of the two ports of the second channel 26 can be different from the cross-sectional shape of the polarity terminal 111, as long as the polarity terminal 111 can be inserted into the second channel 26 and the sealing can be realized.

[0128] When the battery module 1 is constructed, the heat exchange pipes 23 of the single batteries 11 on the same side can be connected, two heat exchange channels are formed at the top of each single battery 11, and the two heat exchange channels can be connected in parallel or in series, and the heat exchange of the battery module 1 is realized based on the two heat exchange channels.

[0129] When each first heat exchange device is connected, a connecting pipe section can be connected to the inlet end or the outlet end of the heat exchange pipe 23. Taking the connection at the inlet end as an example, the connecting pipe section of one of the heat exchange pipes 23 can be inserted into the outlet end of another heat exchange pipe 23, so that the connection between the two adjacent heat exchange pipes 23 is realized, and the connection position of the connecting pipe section and the other heat exchange pipe 23 needs to be sealed. In addition, a connecting pipe section can be arranged at the liquid inlet and the liquid outlet of each heat exchange pipe 23, and the connecting pipe sections of the two adjacent heat exchange pipes 23 are sealed and inserted into each other.

[0130] In addition, since the insulating heat exchange medium flows in the heat exchange pipe 23, the sealing performance of the heat exchange pipe 23 is particularly important. In order to ensure the sealing performance of the heat exchange pipe 23, as shown in FIGS. 1, 2 and 3, two second annular grooves extending along the circumferential direction are formed on each polarity terminal 111, the two second annular grooves are arranged in the z direction, and an O-shaped sealing ring 27 is embedded in each second annular groove. The outer circle of each O-shaped sealing ring 27 is pressed against the two ports of the second channel 26, so that the sealing is realized, and the stability of the heat exchange pipe 23 is also improved. Figure 20 Figure 21 In addition, since the insulating heat exchange medium flows in the heat exchange pipe 23, the sealing performance of the heat exchange pipe 23 is particularly important. In order to ensure the sealing performance of the heat exchange pipe 23, as shown in FIGS. 1, 2 and 3, two second annular grooves extending along the circumferential direction are formed on each polarity terminal 111, the two second annular grooves are arranged in the z direction, and an O-shaped sealing ring 27 is embedded in each second annular groove. The outer circle of each O-shaped sealing ring 27 is pressed against the two ports of the second channel 26, so that the sealing is realized, and the stability of the heat exchange pipe 23 is also improved.

[0131] ​In some other embodiments, when the heat exchange pipe 23 is made of metal, the sealing between the polar terminal 111 and the top port of the second channel 26 can be achieved by welding. In this case, the welding can further improve the stability of the heat exchange pipe 23 on the polar terminal 111. An insulating pad can be additionally arranged between the heat exchange pipe 23 and the top of the single battery 11 to insulate the heat exchange pipe 23 from the top of the single battery 11.

[0132] In this embodiment, the free end of the first heat exchange device as the liquid inlet end and the liquid outlet end is connected to the adapter pipe 21, which is connected to the temperature control pipeline. When the adapter pipe 21 is installed, it is connected to the temperature control pipeline through the outer shell 12. To further ensure the pressure-bearing performance of the outer shell 12, the adapter pipe 21 is integrally formed on the outer shell 12, for example, the adapter pipe 21 can be welded on the outer shell 12. At the same time, the non-connected part of the adapter pipe 21 is preferably flexible. Based on the deformation of the adapter pipe 21, the adapter pipe 21 can be connected to the outer shell 12 and the polar terminal 111, respectively. At the same time, the adapter pipe 21 can be easily and sealingly connected to the corresponding channel port.

[0133] In this embodiment, the polar terminal 111 of the single battery 11 is provided with a structure for increasing the heat exchange area of the polar terminal 111. For the sake of description, the structure for increasing the heat exchange area of the polar terminal 111 is collectively referred to as the functional structure 117. When the polar terminal 111 of each single battery 11 penetrates through the first heat exchange device 2, the part of the polar terminal 111 provided with the functional structure 117 is located in the first heat exchange device 2 and directly contacts the insulating heat exchange medium. Based on the battery module 1 constructed by such single batteries 11, the heat exchange area between the polar terminal 111 and the insulating heat exchange medium can be increased, thereby improving the heat exchange effect between the insulating heat exchange medium and the battery module 1. The functional structure 117 on the polar terminal 111 can adopt the following structures:

[0134] First, as shown in Figure 18 the functional structure 117 includes at least one first annular groove formed in the side surface of the polar terminal 111. A plurality of first annular grooves are arranged along the height direction of the polar terminal 111, and each first annular groove extends along the circumference of the side surface of the polar terminal 111. The number, groove width, and groove depth of the first annular groove can be adjusted according to the requirements without affecting the conductivity of the polar terminal 111. Based on the first annular groove, the heat exchange area of the part of the polar terminal 111 can be increased. When this part is located in the inner cavity of the first heat exchange device 2, the heat exchange area is larger than that of the polar terminal 111 with a smooth side surface, thereby achieving a better heat exchange effect.

[0135] Second, the functional structure 117 includes dot-shaped pits and protrusions on the side of the polar terminal 111. Based on the fact that the dot-shaped pits and protrusions can increase the heat exchange area of ​​this part of the polar terminal 111, after this part is placed in the inner cavity of the first heat exchange device 2, the polar terminal 111 with dot-shaped pits and protrusions has a larger heat exchange area compared with the polar terminal 111 with a smooth side, thereby obtaining a better heat exchange effect.

[0136] Third, the functional structure 117 includes a through hole formed on the polarity terminal 111, which penetrates the polarity terminal 111. Under the premise of ensuring that the conductivity of the polarity terminal 111 is not affected, the cross-sectional area of ​​the through hole is increased as much as possible to increase the heat exchange area and improve the heat exchange effect. Under the premise of not affecting the conductivity of the polarity terminal 111, two or more through holes may also be formed.

[0137] It should be noted that:

[0138] When the heat exchange tube 23 comes into contact with the top of the individual cell 11 or the polarity terminal 111, it may cause a short circuit. In this case, it is necessary to achieve insulation between the heat exchange tube 23 and the top of the individual cell 11 or the polarity terminal 111. The above insulation can usually be achieved in the following ways:

[0139] 2.1 Select heat exchanger fittings 23 made of insulating material;

[0140] 2.2 Select connecting pipe sections made of insulating material;

[0141] 2.3 Using non-insulated heat exchange tubes 23, the tube walls can be insulated, for example, by spraying insulating paint or wrapping with insulating film, to overcome this problem; an insulating sealing gasket can also be added between the heat exchange tubes 23 and the polar terminal 111 and the top of the individual battery 11 to overcome this problem; of course, for safety, multiple insulation methods can be used in combination with the above methods to overcome this problem.

[0142] like Figure 20 As shown, to further improve the stability of the heat exchanger tube 23 on the individual battery 11, this embodiment can add an L-shaped connecting rib 14 between the heat exchanger tube 23 and the individual battery 11 cylinder 121. The horizontal plate of the L-shaped connecting rib 14 is fixedly connected to the heat exchanger tube 23, and the vertical plate of the L-shaped connecting rib 14 is fixedly connected to the individual battery 11 cylinder 121. The specific connection method can be selected according to the material of the heat exchanger tube 23. For example, in this embodiment, the heat exchanger tube 23 is made of insulating material, so the L-shaped connecting rib 14 can be fixedly connected to the heat exchanger tube 23 and the individual battery 11 cylinder 121 by screws; when the heat exchanger tube 23 is made of metal, the L-shaped connecting rib 14 can be fixedly connected to the heat exchanger tube 23 and the individual battery 11 cylinder 121 by welding.

[0143] In addition, if two second channels 26 are provided on the heat exchange pipe 23, and the heat exchange pipe 23 exchanges heat with two polar terminals 111 of the same single battery 11, the heat exchange pipe 23 is arranged on the top of the single battery 11, and the projection of the heat exchange pipe 23 covers the upper cover plate of the single battery 11. If the explosion vent 115 (the explosion vent 115 can also be referred to as an explosion vent, an explosion-proof part, an explosion-proof opening, etc.) is arranged on the upper cover plate of the single battery 11, and the gap between the heat exchange pipe 23 and the upper cover plate is too small or even does not exist, the thermal runaway smoke may not be able to be discharged in time under the shielding of the heat exchange pipe 23, and there is a certain safety hazard. In the embodiment, the following two schemes can be used to solve such problems:

[0144] Scheme 1: Adjust the position of the explosion vent 115 to avoid the heat exchange pipe 23, for example, the explosion vent 115 can be arranged on the lower cover plate.

[0145] Scheme 2: As shown in Figure 21 , another avoiding channel perpendicular to the first channel 25 is arranged on the heat exchange pipe 23; the avoiding channel corresponds to the explosion vent 115 of the upper cover plate; an explosion vent branch pipe 116 is arranged on the upper cover plate, one end of the explosion vent branch pipe 116 is sealingly connected with the upper cover plate region around the explosion vent 115, and the other end penetrates through the avoiding channel and extends out.

[0146] Similarly, if the liquid injection port is located below the heat exchange pipe 23, it is not convenient to inject liquid, therefore, the liquid injection port should also be arranged to avoid the heat exchange pipe 23, and can be arranged at the edge position of the upper cover plate.

[0147] Embodiment 3

[0148] The battery module assembly in the embodiment is similar to the battery module assembly in Embodiment 1. The first heat exchange device 2 of the battery module 1 in the embodiment is different from that in Embodiment 1, and the first heat exchange device 2 in the battery module 1 in the embodiment is realized through the following structure:

[0149] As shown in Figure 22 and Figure 24 , the first heat exchange device 2 is arranged on the top of each single battery 11, the first heat exchange device 2 includes at least one heat exchange plate 24, the polar terminal 111 of each single battery 11 is electrically connected with the electrical connection assembly 13 after penetrating through the heat exchange plate 24 in the z direction, part of the structure of the polar terminal 111 of each single battery 11 is located in the heat exchange plate 24 and directly contacts with the insulating heat exchange medium, and the side wall of the polar terminal 111 of each single battery 11 is sealingly connected with the heat exchange plate 24, the first heat exchange device 2 is insulated from the adjacent single battery 11, and the insulation here refers to that the first heat exchange device 2 is insulated from the part of the polar terminal 111 of each single battery 11 and the part of the shell of each single battery 11 that contacts with each other.

[0150] The first heat exchange device 2 is described in detail below in combination with the drawings and specific embodiments.

[0151] a、As Figure 22 and Figure 23 shown, the first heat exchange device 2 includes two heat exchange plates 24 arranged along the y direction, and each heat exchange plate 24 corresponds to the polarity terminals 111 of all the single batteries 11 located on the same side in the battery module 1.

[0152] Each heat exchange plate 24 is provided with a first channel 25 and a group of second channels 26 arranged along the x direction, and the number of the second channels 26 is consistent with the number of the single batteries 11; the first channel 25 penetrates along the x direction and serves as a heat exchange channel; the second channels 26 penetrate along the z direction and are communicated with the first channel 25; the polarity terminals 111 of all the single batteries 11 located on one side respectively pass through the second channels 26 on one heat exchange plate 24 and are electrically connected with the electrical connection assembly 13, and the polarity terminals 111 of all the single batteries 11 located on the other side respectively pass through the second channels 26 on the other heat exchange plate 24 and are electrically connected with the electrical connection assembly 13, and meanwhile, the two ports of each second channel 26 are sealed with the polarity terminals 111.

[0153] Two heat exchange plates 24 are respectively sleeved on the polarity terminals 111 on different sides of each single battery 11, and the two heat exchange plates 24 can be connected in series, and in some other embodiments, the two heat exchange plates 24 can also be connected in parallel.

[0154] b、As Figure 24 and Figure 25 shown, the first heat exchange device 2 includes one heat exchange plate 24, which is provided with a first channel 25 and two groups of second channels 26 arranged along the x direction; the first channel 25 penetrates along the x direction and serves as a heat exchange channel; the number of the second channels 26 is twice the number of the single batteries 11, and each second channel 26 penetrates along the z direction and is communicated with the first channel 25; the polarity terminals 111 of all the single batteries 11 in the battery module 1 respectively pass through the second channels 26 on the heat exchange plate 24 and are electrically connected with the electrical connection assembly 13, and meanwhile, the two ports of the second channels 26 are sealed with the polarity terminals 111.

[0155] The cross-sectional shape of the heat exchange plate 24 is not specifically limited in the utility model, and since the heat exchange plate 24 in the embodiment is placed on the top of each single battery 11 in a planar shape, the heat exchange plate 24 in the embodiment is a rectangular plate in consideration of structural regularity, and in some other embodiments, a pipe with other structural forms can also be used.

[0156] The first channel 25 is a channel opened in the length direction of the heat exchange plate 24, after the heat exchange plate 24 is fixed on the top of each single battery 11, the length direction of the heat exchange plate 24 is consistent with the arrangement direction of the single battery 11 (the arrangement direction of the single battery 11 is x direction), therefore, the first channel 25 can be considered as extending along the x direction, and the two end ports of the first channel 25 are used as the liquid inlet end and the liquid outlet end of the heat exchange plate 24.

[0157] The second channel 26 is a channel penetrating through the side wall of the heat exchange plate 24 and penetrating through the first channel 25, after the heat exchange plate 24 is fixed on the top of each single battery 11, the extension direction of the second channel 26 is consistent with the height direction of the single battery 11. In addition, each group of second channels 26 needs to correspond to the polarity terminal 111 on the same side of the plurality of single batteries 11 one by one; in the z direction (the height direction of the single battery 11), the size of the second channel 26 is smaller than the size of the corresponding polarity terminal 111, so as to ensure that the top of the polarity terminal 111 as the electrical connection part extends out of the second channel 26.

[0158] The port shape of the second channel 26 in the embodiment is matched with the cross-sectional shape of the polarity terminal 111, the shape of the port of the second channel 26 is circular, the cross section of the polarity terminal 111 is also circular, and the diameter of the two ports of the second channel 26 is slightly larger than the outer diameter of the polarity terminal 111; in other embodiments, the shape of the two ports of the second channel 26 can be different from the cross-sectional shape of the polarity terminal 111, as long as the polarity terminal 111 can be inserted into the second channel 26 and can be sealed.

[0159] In addition, because the insulating heat exchange medium flows in the heat exchange plate 24, the sealing performance of the heat exchange plate 24 is particularly important, in order to ensure the sealing performance of the heat exchange plate 24, two second annular grooves extending along the circumferential direction of each polarity terminal 111 are opened, the two second annular grooves are arranged along the z direction, and the O-shaped sealing ring 27 is embedded in the two second annular grooves, the two O-shaped sealing rings 27 are respectively pressed against the two ports of the second channel 26, so as to realize sealing and improve the stability of the heat exchange plate 24.

[0160] After the first heat exchange device 2 is installed on the top of each single battery 11, the two ports of the first heat exchange device 2 are respectively used as the liquid inlet end and the liquid outlet end, the first heat exchange device 2 is further connected with the adapter pipe 21 at the liquid inlet end and the liquid outlet end, and the adapter pipe 21 is connected with the temperature control pipeline through the adapter pipe 21, and the adapter pipe 21 is connected with the temperature control pipeline by penetrating through the outer shell 12. In order to further ensure the pressure bearing performance of the outer shell 12, the adapter pipe 21 is integrally formed on the end plate 122, that is, the adapter pipe 21 is welded on the adapter pipe 21.

[0161] It should be noted that after the heat exchange plate 24 contacts the polar terminal 111 of the plurality of single batteries 11 and the shell, in order to avoid the problem of short circuit, the following methods can be used to realize the insulation between the heat exchange plate 24 and the single battery 11:

[0162] 3.1, select the heat exchange plate 24 of insulating material, which can realize the insulation between the heat exchange plate 24 and the polar terminal 111, and also realize the insulation between the heat exchange plate 24 and the shell of the single battery 11;

[0163] 3.2, use the heat exchange plate 24 of non-insulating material, and add an insulating member ring between the polar terminal 111 and the heat exchange plate 24; insulate the side wall of the heat exchange plate 24, for example, spray insulating paint, wrap insulating film, etc.; in order to be safe, multiple insulation methods can be combined to overcome this problem.

[0164] In this embodiment, the heat exchange plate 24 of insulating material is used to realize the insulation between the heat exchange plate 24 and the top of each single battery 11 and the polar terminal 111.

[0165] In order to further improve the stability of the heat exchange plate 24 on each single battery 11, an L-shaped connecting rib can be added between the heat exchange plate 24 and the cylinder 121 of at least one single battery 11 constituting the battery module 1, the horizontal plate of the L-shaped connecting rib is fixedly connected with the heat exchange plate 24, and the vertical plate of the L-shaped connecting rib is fixedly connected with the cylinder 121 of the single battery 11. The specific connection method can be selected according to the material of the heat exchange plate 24. For example, the heat exchange plate 24 of this embodiment is made of insulating material, so the L-shaped connecting rib and the heat exchange plate 24 and the cylinder 121 of the single battery 11 can be fixedly connected by screws. When the heat exchange plate 24 is made of metal material, the L-shaped connecting rib and the heat exchange plate 24 and the cylinder 121 of the single battery 11 can be fixedly connected by welding.

Claims

1. A battery module assembly, comprising: The battery module, the first heat exchange device and the second heat exchange device are included. The battery module includes an outer shell and a plurality of single batteries arranged in the outer shell. The first heat exchange device is arranged on the top of each single battery in the outer shell and insulated from each single battery. The second heat exchange device is arranged on at least one of the bottom of the outer shell and the sidewall of the outer shell to exchange heat with the outer shell of the battery module.

2. The battery module assembly of claim 1, wherein, The first heat exchange device includes a connecting pipe assembly, and each single battery is provided with a channel penetrating through the polar terminal.

3. The battery module assembly of claim 1, wherein, The first heat exchange device includes a plurality of sub-first heat exchange devices, each of which is arranged on the top of each single battery.

4. The battery module assembly of claim 1, wherein, The first heat exchange device includes at least one heat exchange plate, which has a first channel extending in the x direction and at least one second channel arranged in the x direction.

5. The battery module assembly of claim 1, wherein, The part of the polar terminal of each single battery in contact with the insulating heat exchange medium is provided with a functional structure for increasing the heat exchange area.

6. The battery module assembly of any one of claims 1 to 5, wherein, The second heat exchange device includes at least one liquid cooling plate arranged on the sidewall of the outer shell to exchange heat with the sidewall of the outer shell.

7. The battery module assembly of claim 6, wherein, The liquid inlet port and the liquid outlet port of the liquid cooling plate are located on the same sidewall of the liquid cooling plate, and the liquid inlet port is located below the liquid outlet port.

8. The battery module assembly of claim 6, wherein, The first heat exchange device and the second heat exchange device are connected in series.

9. The battery module assembly of any one of claims 1 to 5, wherein, The outer shell has a venting channel covering the venting part of each single battery.

10. The battery module assembly of claim 9, wherein, The outer shell includes a cylindrical body with two open ends and two end plates sealingly arranged at the open ends of the cylindrical body. The end plate includes a first sealing plate and a second sealing plate arranged in parallel, the first sealing plate is used to seal the open end of the cylindrical body, and the second sealing plate is used to clamp the single battery in the x direction.

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