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; a first avoiding hole is formed in the top plate of the outer shell corresponding to the polar terminal of each single battery; the polar terminals of the single batteries extend out of the first avoiding holes and then are electrically connected, the first heat exchange device is arranged at the top of the outer shell and exchanges heat with the polar terminals of the single batteries, and the second heat exchange device is arranged at 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. First avoiding holes are formed in the top plate of the outer shell corresponding to the polarity terminals of each single battery. The polarity terminals of each single battery are electrically connected after extending out of the first avoiding holes. The region of the top plate of the outer shell corresponding to the first avoiding holes is fixedly sealed with the shell of the single battery. The first heat exchange device is arranged at the top of the outer shell and is insulated from the outer shell and 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 polarity 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 is a hollow box body with one end open. The open end of the hollow box body is sealingly fixed with the top plate of the outer shell, and the cavity formed by the hollow box body and the top plate of the outer shell serves as a heat exchange channel. Second avoiding holes are formed in the hollow box body corresponding to the polarity terminals of each single battery. The polarity terminals of each single battery extend out of the corresponding second avoiding holes, and the polarity terminals are sealingly connected with the second avoiding holes.

[0007] Further, the first heat exchange device comprises a connecting pipe assembly. A channel penetrating the polarity terminal is arranged on the polarity terminal of each single battery. The connecting pipe assembly connects the channels on the polarity terminals of adjacent single batteries to form a heat exchange channel. The connecting pipe assembly is insulated from the polarity terminals of each single battery.

[0008] Further, the part of each single battery polarity terminal in contact with the insulating heat exchange medium is provided with a functional structure for increasing the heat exchange area.

[0009] Further, the second heat exchange device comprises at least one liquid cooling plate arranged on the side wall of the outer shell and performing heat exchange with the side wall of the outer shell.

[0010] 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.

[0011] Further, the first heat exchange device and the second heat exchange device are connected in series.

[0012] Further, the upper part of the outer shell is provided with an insulating sealing adhesive layer, the main part of the first heat exchange device is located in the insulating sealing adhesive layer, the adapter pipe connected with the liquid inlet port and the liquid outlet port of the first heat exchange device extends out of the insulating sealing adhesive layer, the top of the outer shell is provided with an insulating protective cover, and each single battery polarity terminal and the first heat exchange device are located in the insulating protective cover.

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

[0014] Further, the outer shell comprises a cylinder with an open top or bottom, a top plate sealing the open top of the cylinder, and a bottom plate sealing the open bottom of the cylinder, the top plate is provided with a protrusion extending in the x direction, and the blast passage is formed in the protrusion.

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

[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 performs heat exchange with the polarity terminals of each single battery in the battery module, can timely lead out the heat of the single battery polarity terminal with relatively concentrated heat, the second heat exchange device mainly performs heat exchange 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 and the second heat exchange device perform heat exchange with the polarity terminals of the battery module and the outer shell, so that the temperature at different positions of the whole battery module is effectively controlled, the performance problems and safety problems caused by 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, and the utilization efficiency of the insulating heat exchange medium is improved, the heat exchange efficiency of the battery module is improved, the temperature control effect of the battery module is improved, and the safety of the battery module during use is further improved.

[0018] 2. In the battery module assembly, the first heat exchange device is a hollow box body with one end open, and in the heat exchange channel formed by the hollow box body, the insulating heat exchange medium not only directly exchanges heat with the polar terminals of the single batteries, but also directly exchanges heat with the top plate of the shell body, further improving the heat exchange effect of the insulating heat exchange medium on the battery module.

[0019] 3. In the battery module assembly, the first heat exchange device includes at least one heat exchange plate, and the heat exchange plate exchanges heat with the polar terminals of all single batteries in the battery module. The first heat exchange device adopts an integrated structure, has good overall sealing, and is convenient to process and manufacture.

[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. 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 heat exchange area is larger, and 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 body. The liquid cooling plate has a large heat exchange area when exchanging heat with the side wall of the shell body, 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 body, and the liquid outlet port is close to the top of the shell body. 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 body is greater than that of the top of the shell body. At the same time, since the heat of the top of the shell body has been treated by the first heat exchange device, the setting 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 are generated is also reduced.

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

[0025] 9. The battery module assembly of the utility model, the shell body includes the cylinder structure of at least one end of the top or bottom is open, and the top plate of sealing cylinder top open end, the bottom plate of sealing cylinder bottom open, the height of the cylinder in the shell body of this structure is almost the same as the shell height of single battery, so that the volume and manufacturing cost of the whole battery module are smaller. At the same time, the polarity terminal of each single battery in the battery module extends out of the shell body, the installation of first heat exchange device and electrical connection assembly is convenient, and the single battery in the shell body is not easy to affect the electrical connection assembly and first heat exchange device when thermal runaway.

[0026] 10. The battery module assembly of the utility model, the top plate of the shell body is provided with an insulating sealing adhesive layer, the main part of first heat exchange device is located in the insulating sealing adhesive layer, the insulating sealing adhesive layer can avoid the short circuit problem caused by the condensation outside first heat exchange device, and further improve the sealing property of the whole first heat exchange device. In addition, the battery module uses the insulating protective cover to provide insulation protection for the polarity terminal and first heat exchange device, avoids the security risk that may exist in the exposed polarity terminal during the operation of the battery module, and also avoids the problem that some foreign matters in the external environment fall into the polarity terminal position and cause the short circuit of the battery module, and the safety of the battery module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structural schematic view that the side wall of the battery module shell body in embodiment 1 is provided with 1 liquid cooling plate;

[0028] Figure 2 It is the structural schematic view that the side wall of the battery module shell body in embodiment 1 is provided with 2 liquid cooling plates;

[0029] Figure 3 It is the structural schematic view that the bottom of the battery module shell body in embodiment 1 is provided with a liquid cooling plate;

[0030] Figure 4 It is the structural schematic view that the side wall and bottom of the battery module shell body in embodiment 1 are provided with liquid cooling plates;

[0031] Figure 5 Schematic diagram of the battery module in Example 1

[0032] Figure 6 Exploded view of the battery module in Example 1 Figure 1 ;

[0033] Figure 7 Exploded view of the battery module in Example 1 Figure 2 ;

[0034] Figure 8 Exploded view of the first heat exchange device in Example 1

[0035] Figure 9 Cross-sectional view of the battery module in Example 1 Figure 1 ;

[0036] Figure 10 Cross-sectional view of the battery module in Example 1 Figure 2 ;

[0037] Figure 11 Structure schematic diagram of the single battery in Example 1

[0038] Figure 12 Structure schematic diagram of the liquid cooling plate in Example 1

[0039] Figure 13 Structure schematic diagram of the battery module provided with an insulating sealing adhesive layer in Example 2

[0040] Figure 14 Structure schematic diagram of the battery module provided with an insulating protective cover in Example 2

[0041] Figure 15 Structure schematic diagram of the battery module in Example 3

[0042] Figure 16 Exploded view of the battery module in Example 3

[0043] Figure 17 Cross-sectional view of the battery module in Example 3

[0044] Figure 18 Structure schematic diagram of the battery module in Example 4 Figure 1 ;

[0045] Figure 19 Structure schematic diagram of the heat exchange plate in Example 4 Figure 1 ;

[0046] Figure 20 Structure schematic diagram of the battery module in Example 4 Figure 2 ;

[0047] Figure 21Structure diagram of heat exchange plate in embodiment 4 Figure 2 ;

[0048] Figure 22 Sectional view of battery module in embodiment 4

[0049] Figure 23 Structure diagram of battery module in embodiment 5

[0050] Figure 24 Exploded view of battery module in embodiment 5

[0051] Figure 25 Structure diagram of battery module in embodiment 5

[0052] Figure 26 Sectional view of battery module in embodiment 5

[0053] Fig. 1 is a battery module, Fig. 2 is a first heat exchange device, Fig. 3 is a second heat exchange device, Fig. 11 is a single battery, Fig. 12 is an outer shell, Fig. 13 is an electrical connection assembly, Fig. 14 is a sealing connecting piece, Fig. 15 is a support piece, Fig. 16 is an insulating sealing adhesive layer, Fig. 17 is an insulating protective cover, Fig. 18 is an explosion venting part, Fig. 111 is a polarity terminal, Fig. 112 is a channel, Fig. 113 is a fixing part, Fig. 114 is a heat-conducting rib plate, Fig. 115 is a functional structure, Fig. 121 is a cylinder, Fig. 122 is an end plate, Fig. 123 is an explosion venting channel, Fig. 124 is an explosion venting mechanism, Fig. 1211 is a first avoiding hole, Fig. 1221 is a first sealing plate, Fig. 1222 is a second sealing plate, Fig. 131 is a first electrical connecting piece, Fig. 132 is a second electrical connecting piece, Fig. 21 is an adapter pipe, Fig. 22 is a sub connecting pipe, Fig. 23 is a heat exchange pipe piece, Fig. 24 is a heat exchange plate, Fig. 25 is a first channel, Fig. 26 is a second channel, Fig. 27 is a hollow box, Fig. 28 is an O-shaped sealing ring, Fig. 29 is an intermediate pipe section, Fig. 271 is a sealing top plate, Fig. 272 is a second side plate, Fig. 273 is a first side plate, Fig. 274 is a second avoiding hole, Fig. 31 is a liquid cooling plate, Fig. 311 is an inlet port, Fig. 312 is an outlet port, and Fig. 313 is a partition plate. DETAILED DESCRIPTION

[0054] In order to make the above objectives, characteristics and advantages of the present application more apparent, clear and understandable, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0055] Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. However, the present application can be practiced according to other embodiments that are not specifically described herein, and the present application is not limited to the embodiments described herein. Therefore, the scope of the present application is not limited to the specific embodiments described herein.

[0056] In the description of the present application, it should be noted that the positions or relationships indicated by the terms "top, bottom" and the like in the description are based on the positions or relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. 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.

[0057] 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 during use, the battery module is generally provided with a heat management device, which either processes the heat of the battery module shell or processes 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.

[0058] The present application is provided with a first heat exchanger and a second heat exchanger. The first heat exchanger mainly exchanges heat with the polarity terminals 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 exchanger 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 exchanger and the second heat exchanger exchange heat with the polarity terminals and the shell of the battery module at the same time, effectively avoiding the accumulation of heat between each single battery in the shell of the battery module, achieving balanced heat dissipation of each single battery in the battery module, and effectively controlling the temperature of different positions and different areas of the entire battery module, avoiding performance problems and safety problems caused by excessively high or low temperature of the battery module, and improving the safety of the battery module during use.

[0059] 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 polar terminal of the single battery, that is, part of the structure of the polar terminal is directly placed in the first heat exchange device, so that the polar terminal directly contacts the insulating heat exchange medium, and the insulating heat exchange medium directly acts on the polar 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.

[0060] Embodiment 1

[0061] As shown in Figures 1 to 4 , the present 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 first heat exchange device 2 mainly exchanges heat with the polar terminal 111 of each single battery 11 in the battery module 1, and the second heat exchange device 3 mainly exchanges heat with the outer shell 12 of the battery module 1. The structure of the battery module 1, the first heat exchange device 2 and the second heat exchange device 3 will be described in detail below.

[0062] As shown in Figures 5 to 7 , the battery module 1 in the present embodiment comprises a plurality of single batteries 11 and an outer shell 12. The number of single batteries 11 can be adjusted according to actual needs. The plurality of single batteries 11 are arranged in the same direction in the outer shell 12 and are insulated from the outer shell 12. The insulation treatment can be specifically that an insulating layer is arranged on the inner wall of the outer shell 12, or an insulating layer is added to the battery shell of each single battery 11, or an insulating pad is added between the single battery 11 and the outer shell 12.

[0063] The top plate of the outer shell 12 is provided with a first avoiding hole 1211 through which the polar terminal 111 of each single battery 11 extends. After the plurality of single batteries 11 are arranged in the same direction in the outer shell 12, the polar terminal 111 of each single battery 11 extends out of the corresponding first avoiding hole 1211 and is connected in series through the electrical connection assembly 13. At the same time, a sealing connecting piece 14 is additionally arranged between the polar terminal 111 of each single battery 11 and the first avoiding hole 1211, so as to fix and seal the top plate area of the cylinder 121 corresponding to the first avoiding hole 1211 and the shell of the single battery 11.

[0064] As shown in Figure 8 , Figure 9 , and Figure 10As shown, the sealing connector 14 includes a hollow component. The bottom of the hollow component is used for a sealed connection with a first region of the single cell 11, and the top of the hollow component is used for a sealed connection with a second region of the top plate of the outer casing 12. The first region is the area surrounding any polar terminal 111 on the upper cover of any single cell 11. The area surrounding the polar terminal 111 is the area surrounding the insulating sealing gasket on the polar terminal 111. The insulating sealing gasket is a component on the single cell 11 used to insulate between the polar terminal 111 and the upper cover of the single cell 11. The second region is the area on the top plate of the outer casing 12 corresponding to any first clearance hole 1211. The area on the top plate of the outer casing 12 corresponding to the first clearance hole 1211 is the area surrounding any first clearance hole 1211 on the outer surface of the top plate of the outer casing 12; or the area on the top plate of the outer casing 12 corresponding to the first clearance hole 1211 is the wall of the first clearance hole 1211.

[0065] For ease of description, in this embodiment, the arrangement direction of the individual battery cells 11 is defined as the x-direction, the height direction of the individual battery cells 11 is defined as the z-direction, and the direction perpendicular to both the x-direction and the z-direction is defined as the y-direction.

[0066] In this embodiment, the outer casing 12 mainly integrates and mounts each individual battery cell 11, and also provides safety protection for each individual battery cell 11. The outer casing 12 can withstand a certain amount of pressure. In the event of thermal runaway of each individual battery cell 11, the outer casing 12 can ensure that thermal runaway fumes do not leak from the outer casing 12, thus avoiding damage to devices near the battery module 1.

[0067] like Figure 6 As shown, to further enhance the safety of the battery module 1 during use, the outer casing 12 is provided with a venting channel 123 and a venting mechanism 124. The venting channel 123 covers the venting portion 18 of each individual battery cell 11, which can specifically be a venting membrane disposed on the casing of each individual battery cell 11. The venting mechanism 124 is connected to the venting channel 123 and can directionally and orderly discharge the thermal runaway fumes emitted by each individual battery cell 11. The venting mechanism 124 specifically includes a pressure relief pipe and a pressure relief section. The pressure relief pipe is connected to the venting port of the outer casing 12, and the pressure relief section is disposed on the pressure relief pipe or on the venting port of the outer casing 12. The pressure relief section can specifically be a venting membrane or a venting valve. This venting mechanism 124 can ensure that the thermal runaway fumes inside the battery module 1 can be smoothly discharged when thermal runaway occurs, avoiding safety hazards such as explosions inside the outer casing 12 of the battery module 1.

[0068] The shape and size of the outer casing 12 can be designed to facilitate placement according to the application scenario of the battery module 1. In this embodiment, the outer casing 12 is a rectangular shell, which can specifically adopt the following structure:

[0069] First, as Figure 5 and Figure 6 shown, the outer shell 12 includes a cylinder 121 with both ends open, and two end plates 122 sealingly arranged at the open ends of the cylinder 121. The front and rear of the cylinder 121 are both open, one of the end plates 122 is sealingly fixed to the open end of the front of the cylinder 121, and the other end plate 122 is sealingly fixed to the open end of the rear of the cylinder 121. The sealing fixation can be welding or threaded connection, etc. The outer shell 12 of this structure has good pressure-bearing performance, and the cylinder 121 can be integrally formed by extrusion process, so that the cylinder 121 has good pressure resistance.

[0070] As Figure 6 shown, based on the structure of the outer shell 12, when each monomer battery 11 is installed, each monomer battery 11 is pushed into the cylinder 121 from the open end of the cylinder 121, and then each monomer battery 11 is lifted to make the polarity terminal 111 of each monomer battery 11 pass through the first avoiding hole 1211 of the top plate of the cylinder 121, and then the support 15 extending along the x direction can be inserted between the bottom plate of the cylinder 121 and each monomer battery 11, and the support 15 supports each monomer battery 11 in the z direction. From the installation process, it can be seen that since each monomer battery 11 is placed in the cylinder 121 from the open end of the side of the cylinder 121, and then the polarity terminal 111 of each monomer battery 11 is stretched out from the first avoiding hole 1211 on the top plate of the cylinder 121, this installation method requires that the height between the bottom plate of the cylinder 121 and the top plate of the cylinder 121 is greater than the height between the polarity terminal 111 of each monomer battery 11 and the bottom of the monomer battery 11, so as to realize the installation of each monomer battery 11.

[0071] After the support 15 lifts and supports each monomer battery 11, a cavity is formed between each monomer battery 11 and the bottom plate of the cylinder 121, which can be used as a venting channel 123 at this time. The venting channel 123 covers the venting part 18 at the bottom of each monomer battery 11, and when the venting part 18 of any monomer battery 11 is broken by the hot smoke in the cavity, the hot smoke is discharged through the venting channel 123.

[0072] The end plate 122 is mainly used for sealing the open end of the cylinder 121. The end plate 122 in the embodiment includes a first sealing plate 1221 and a second sealing plate 1222 arranged in parallel. The first sealing plate 1221 is used to seal the open end of the cylinder 121, and the venting mechanism 124 is arranged on the first sealing plate 1221. By adjusting the size of the second sealing plate 1222 in the x direction, the end plate 122 can clamp all monomer batteries 11 in the x direction, prevent each monomer battery 11 from swelling, and improve the stability of each monomer battery 11 in the outer shell 12.

[0073] In other embodiments, the end plate 122 can also adopt a structure of a sealing plate, and the end plate 122 of this structure has relatively weak pressure bearing performance compared with the end plate 122 of the double-sealing plate structure.

[0074] Second, as shown in Figure 7 The outer shell 12 includes a cylinder body 121, a top plate and a bottom plate, at least one end of the top or bottom of the cylinder body 121 is open, the top plate is sealingly fixed to the open end of the top of the cylinder body 121, and the bottom plate is sealingly fixed to the open end of the bottom of the cylinder body 121. The sealing fixation can be welding or threaded connection, etc. In some embodiments, the bottom plate and the cylinder body 121 are an integral structure, or the top plate and the cylinder body 121 are an integral structure, and the outer shell 12 of this structure has better pressure bearing performance and sealing performance.

[0075] The installation process of each single battery 11 is described with the top plate and the cylinder body 121 being an integral structure and the bottom plate and the cylinder body 121 being a separate structure. When installing each single battery 11, each single battery 11 is placed into the cylinder body 121 from the open end of the bottom of the cylinder body 121, so that the polarity terminal 111 of each single battery 11 passes through the first avoiding hole 1211 of the top plate, and then the bottom plate is fixedly connected with the cylinder body 121. This installation method makes the height of the cylinder body 121 only slightly larger than the height of the shell of each single battery 11, that is, the height of the cylinder body 121 only needs to consider the size of the shell of each single battery 11, and does not need to consider the size of the polarity terminal 111 of each single battery 11. Compared with the structure in which the cylinder body 121 is open from the side end, the structure in which the cylinder body 121 is open from the top or bottom makes the height of the entire cylinder body 121 relatively small, thereby reducing the height of the entire battery module 1 in the z direction, and the volume and manufacturing cost of the battery module 1 are also reduced. At the same time, the outer shell 12 structure installed from the top or bottom does not need to provide a support 15 in the cylinder body 121, and the manufacturing cost of the entire battery module 1 is further reduced.

[0076] The aforementioned outer casing 12, installed from the top or bottom, has an explosion venting channel 123. Specifically, the explosion venting channel 123 can be located at the top or bottom of the inner cavity of the outer casing 12. When the explosion venting channel 123 is located at the top of the inner cavity of the outer casing 12, a protrusion extending in the x-direction can be provided on the top plate of the outer casing 12, forming the explosion venting channel 123 within the protrusion. Alternatively, if the top plate of the outer casing 12 is a flat plate structure, and the explosion venting channel 123 is formed between the top of the individual battery 11 and the top plate, then a certain space needs to be left between the top of the individual battery 11 and the top plate. In actual installation, the height of the polarity terminals 111 of each individual battery 11 needs to be increased to meet the requirements of contact between the polarity terminals 111 and the heat exchange channel, and electrical connection with the electrical connection assembly 13. When the height of the polar terminal 111 of the single cell 11 is increased, the height of the sealing connector 14 and the cylinder 121 is also increased accordingly, which in turn increases the height of the entire battery module 1 in the z direction, and the volume and manufacturing cost of the entire battery module 1 are also further increased.

[0077] When the explosion venting channel 123 is located at the bottom of the inner cavity of the outer casing 12, a protrusion extending in the x-direction can also be provided on the bottom plate of the outer casing 12, forming the explosion venting channel 123 within the protrusion. Alternatively, a support member 15 extending in the x-direction can be inserted between the bottom plate of the outer casing 12 and each individual battery cell 11. After the support member 15 raises and supports each individual battery cell 11 in the z-direction, the cavity between the bottom plate of the outer casing 12 and the bottom of each individual battery cell 11 becomes the explosion venting channel 123. However, this type of explosion venting channel 123 will also increase the overall height of the outer casing 12 in the z-direction.

[0078] Therefore, setting a protrusion on the top plate of the outer casing 12 and forming a venting channel 123 within the protrusion is a relatively better approach. The venting channel 123 of this structure will not increase the overall height of the outer casing 12, and there is no need to set a support member 15 inside the cylinder 121. The manufacturing cost of the entire battery module 1 is also relatively low.

[0079] like Figures 5 to 7 As shown, during the assembly of battery module 1, electrical connections between individual battery cells 11 are achieved through electrical connection assembly 13. In this embodiment, electrical connection assembly 13 includes a first electrical connector 131 and a second electrical connector 132. The first electrical connector 131 is used to connect the individual battery cells 11 in series within battery module 1, and the second electrical connector 132 enables electrical connection between battery module 1 and external devices. Specifically, the individual battery cells 11 in battery module 1 can be connected in series in the following ways:

[0080] First, the positive polarity terminals of each single battery 11 are located on the same side of the single battery 11, and the negative polarity terminals of each single battery 11 are located on the other side of the single battery 11; that is, the adjacent single batteries 11 have the same polarity of the same side polarity terminals 111, and the polarity terminals 111 of different polarities of the adjacent single batteries 11 are electrically connected through the first electrical connecting member 131 arranged obliquely to the x direction, and the two second electrical connecting members 132 are electrically connected with the single batteries 11 at both ends of the battery module 1, and the two second electrical connecting members 132 are respectively used as the electrical connecting terminals connected outside the battery module 1;

[0081] Second, the adjacent single batteries 11 have different polarities of the same side polarity terminals 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 on the same side of the battery module 1; at this time, the adjacent two single batteries 11 have opposite polarities of the same side polarity terminals 111, and the polarity terminals 111 of the adjacent single batteries 11 located on the same side are electrically connected through the first electrical connecting member 131 arranged parallel to the x direction; the two second electrical connecting members 132 are electrically connected with the single batteries 11 at both ends of the battery module 1, and the two second electrical connecting members 132 are respectively used as the electrical connecting terminals connected outside the battery module 1;

[0082] The first electrical connecting member 131 and the second electrical connecting member 132 are generally an electrical connecting plate, which is electrically connected with the polarity terminals 111 of each single battery 11, and can be welded on the polarity terminals 111 of each single battery 11, or can also be fixed on the polarity terminals 111 of each single battery 11 by screws.

[0083] As shown in Figures 1 to 4 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 polarity terminals 111 of each battery module 1, and timely leads out the heat on the polarity terminals 111 which concentrate heat, and is mainly used for controlling the temperature of the top of the battery module 1, especially the part of the polarity terminals 111 of the battery module 1. The second heat exchange device 3 mainly exchanges heat with the 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 best temperature range, and the safety of the battery module 1 during use is improved.

[0084] As shown in Figure 5 and Figure 8As shown, the first heat exchange device 2 in the embodiment is arranged at the top of the outer shell 12, and the first heat exchange device 2 is insulated from the outer shell 12 and each single battery 11. The first heat exchange device 2 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 terminal 111 of each single battery 11 for heat exchange. The insulating heat exchange medium is introduced into the heat exchange channel to directly contact the polar terminal 111, thereby achieving temperature control of the battery module 1. When the temperature of the battery module 1 is higher than a set threshold, the battery module 1 is cooled by introducing an insulating heat exchange medium with a lower temperature into the heat exchange channel. When the temperature of the battery module 1 is lower than the set threshold, the battery module 1 is heated by introducing an insulating heat exchange medium with a higher temperature into the heat exchange channel. By controlling the temperature of the insulating heat exchange medium, the battery module 1 can always operate at a normal working temperature.

[0085] The first heat exchange device 2 adopts a direct heat exchange mode, so that the polar terminal 111 directly contacts the insulating heat exchange medium to achieve heat exchange of the polar terminal 111. Compared with the effect of indirectly exchanging heat between the polar terminal 111 and the insulating heat exchange medium through a heat exchange member, first, the heat exchange path is shorter, which can improve the utilization efficiency of the insulating heat exchange medium. Second, the heat exchange area is larger, which improves the heat exchange efficiency, and further improves the heat exchange efficiency of such a battery module 1.

[0086] The first heat exchange device 2 and the heat exchange channel in the embodiment are implemented through the following structure:

[0087] As shown in Figures 8 to 10 , the first heat exchange device 2 includes a plurality of sub-first heat exchange devices, each of which corresponds to each single battery 11. The sub-first heat exchange device includes at least one heat exchange pipe member 23, each of which has a first channel 25 extending in the x direction and at least one second channel 26. The polar terminal 111 of each single battery 11 passes through the first avoiding hole 1211 on the top plate of the cylinder body 121, and then corresponds to the heat exchange pipe member 23 in the z direction to realize electrical connection with the electrical connection assembly 13. The first channel 25 of the heat exchange pipe member 23 of the adjacent single battery 11 is communicated to form a heat exchange channel. Part of the structure of the polar terminal 111 of each single battery 11 is located in the heat exchange channel and directly contacts the insulating heat exchange medium. Each heat exchange pipe member 23 is insulated from the adjacent single battery 11.

[0088] The specific structure of the sub-first heat exchange device in the embodiment will be described in detail below with reference to the accompanying drawings.

[0089] a、As shown in Figure 8 and Figure 9As shown, 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 polar terminals 111 of each single battery 11 correspondingly pass through the second channels 26 on the two heat exchange pipe fittings 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;

[0090] b、The sub first heat exchange device includes one heat exchange pipe fitting 23, each heat exchange pipe fitting 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 fitting 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;

[0091] c、As shown, Figure 10 The sub first heat exchange device includes two heat exchange pipe fittings 23 arranged along the y direction, the heat exchange pipe fitting 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, the half pipe is buckled and sealed and fixed on the top plate of the cylinder body 121, 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 polar terminals 111 of each single battery 11 correspondingly pass through the second channels 26 on the two heat exchange pipe fittings 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;

[0092] d、The sub first heat exchange device includes one heat exchange pipe fitting 23, the heat exchange pipe fitting 23 is a half pipe, the half pipe is buckled and sealed and fixed on the top plate of the cylinder body 121, each heat exchange pipe fitting 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 fitting 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.

[0093] When the battery module 1 is installed, the heat exchange pipes 23 on the polarity terminals 111 of the adjacent single batteries 11 are connected to each other to form a heat exchange channel, and heat exchange between the single batteries 11 is achieved. The cross-sectional shape of the heat exchange pipe 23 is not limited in the embodiment. Since the heat exchange pipe 23 in the embodiment is arranged on the top of the flat cylindrical body 121, the heat exchange pipe 23 is a rectangular pipe or a rectangular half pipe in consideration of the structural regularity. In other embodiments, a round pipe or a pipe with other structures can also be used.

[0094] The first channel 25 is a channel formed along the length direction of the heat exchange pipe 23. The inner cavity of the first channel 25 is used as a flow cavity of the insulating heat exchange medium. 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. 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 as the electrical connection part can extend out of the second channel 26.

[0095] 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 achieved.

[0096] When the battery module 1 is constructed, the heat exchange pipes 23 of the single batteries 11 on the same side can be connected to form two heat exchange channels on the top of the battery module 1. The two heat exchange channels can be connected in parallel or in series, and the heat exchange of the battery module 1 is achieved based on the two heat exchange channels.

[0097] When the connection is made, a connection pipe section can be connected to the inlet end or the outlet end of the heat exchange pipe 23. Taking the connection to the inlet end as an example, the connection pipe section of one of the heat exchange pipes 23 can be inserted into the outlet end of the other heat exchange pipe 23 to achieve the connection of the two adjacent heat exchange pipes 23, and the connection position of the connection pipe section and the other heat exchange pipe 23 needs to be sealed. Figure 8 As shown in FIG. 8, the connection pipe sections can also be arranged at the liquid inlet and the liquid outlet of each heat exchange pipe 23. The connection pipe section of one of the two adjacent heat exchange pipes 23 and the connection pipe section of the other heat exchange pipe 23 are connected through the intermediate pipe section 29.

[0098] As shown in FIG. 9, the connection pipe sections can also be arranged at the liquid inlet and the liquid outlet of each heat exchange pipe 23. The connection pipe section of one of the two adjacent heat exchange pipes 23 and the connection pipe section of the other heat exchange pipe 23 are connected through the intermediate pipe section 29. Figure 9 and Figure 10As shown, since the heat exchanger tube 23 contains an insulating heat exchange medium, its sealing performance is particularly important. To ensure the sealing performance of the heat exchanger tube 23, this embodiment provides two second annular grooves extending circumferentially on each polarity terminal 111, with the two second annular grooves arranged along the z-direction. O-rings 28 are embedded in the two second annular grooves, and the two O-rings 28 are pressed against the two ports of the second channel 26 respectively, thereby achieving sealing and improving the stability of the heat exchanger tube 23.

[0099] In some other embodiments, when a metal heat exchange tube 23 is used, the polar terminal 111 and the top port of the second channel 26 can be sealed by welding (the top port mentioned here is the port near the electrical connection part of the polar terminal 111, and the stability of the heat exchange tube 23 on the polar terminal 111 can be further improved by welding).

[0100] In this embodiment, a transfer pipe 21 is also connected to the liquid inlet and liquid outlet of the first heat exchange device 2, which facilitates connection with external temperature control pipelines.

[0101] When exchanging heat with the first heat exchange device 2, in this embodiment, the polar terminal 111 of the individual battery 11 is provided with a structure to increase the heat exchange area of ​​the polar terminal 111. For ease of description, the structure that can increase the heat exchange area of ​​the polar terminal 111 is collectively referred to as functional structure 115. When the polar terminal 111 of each individual battery 11 passes through the first heat exchange device 2, the part of the polar terminal 111 with functional structure 115 is located inside the first heat exchange device 2 and is in direct contact with the insulating heat exchange medium. After constructing the battery module 1 based on such individual 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 115 on the polar terminal 111 can specifically adopt the following structure:

[0102] First, such as Figure 11 As shown, the functional structure 115 includes at least one first annular groove formed on the side of the polarity terminal 111. Multiple first annular grooves are arranged along the height direction of the polarity terminal 111, and each first annular groove extends circumferentially along the side of the polarity terminal 111. Without affecting the conductivity of the polarity terminal 111, the number of first annular grooves, as well as their width and depth, can be adjusted as needed. Since the first annular grooves can increase the heat exchange area of ​​this part of the polarity terminal 111, placing this part inside the cavity of the first heat exchange device 2 results in a larger heat exchange area compared to the polarity terminal 111 with a smooth side surface, thereby achieving a better heat exchange effect.

[0103] Second, the functional structure 115 includes point-like pits, protrusions and the like on the side of the polarity terminal 111, and the heat exchange area of the part of the polarity terminal 111 can be increased based on the point-like pits and protrusions. After the part is located in the inner cavity of the first heat exchange device 2, the polarity terminal 111 with the point-like pits and protrusions has a larger heat exchange area than the polarity terminal 111 with smooth sides, and thus a better heat exchange effect can be obtained.

[0104] Third, the functional structure 115 includes a through hole provided on the polarity terminal 111 and penetrating the polarity terminal 111. On the premise of not affecting the electrical conductivity of the polarity terminal 111, 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. On the premise of not affecting the electrical conductivity of the polarity terminal 111, two or more through holes can also be provided.

[0105] It should be noted that:

[0106] Since the polarity terminal 111 of the utility model 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 and the like. In the utility model, 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 and the like.

[0107] After the heat exchange pipe 23 contacts the outer shell 12 or the polarity terminal 111, a short circuit can be caused. At this time, insulation between the heat exchange pipe 23 and the outer shell 12 and the polarity terminal 111 needs to be realized. The following methods can be used to realize the insulation:

[0108] 1.1, selecting an insulating material for the heat exchange pipe 23;

[0109] 1.2, selecting an insulating material for the intermediate pipe section 29;

[0110] 1.3, using a non-insulating material for the heat exchange pipe 23. The heat exchange pipe 23 can be insulated, for example, by spraying insulating paint, wrapping insulating film and the like, to overcome the problem. An insulating sealing gasket can also be added between the heat exchange pipe 23 and the polarity terminal 111 and the top of the cylinder 121 to overcome the problem. Of course, to be on the safe side, multiple insulation methods can be combined to overcome the problem.

[0111] For example, Figures 1 to 4As shown, the second heat exchange device 3 in the embodiment is arranged at least one of the bottom of the outer shell 12 and the side wall of the outer shell 12, and exchanges heat with the bottom or the side wall of the outer shell 12 to process the heat generated by the battery module 1. The second heat exchange device 3 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.

[0112] Preferably, the liquid cooling plate 31 exchanges heat with the side wall of the outer shell 12, which has a larger heat exchange area and can further improve the temperature control effect of the battery module 1. At the same time, the liquid cooling plate 31 arranged on the side wall of the outer shell 12 can also inhibit the deformation of the outer shell 12 due to expansion, avoiding the safety hazards such as leakage, internal short circuit, and thermal runaway caused by the bulging deformation of the outer shell 12, and improving the safety and reliability of the battery module 1.

[0113] As shown in Figure 1 and Figure 12 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 to exchange heat with the side wall of the outer shell 12. The side wall of the liquid cooling plate 31 is provided with two ports as the liquid inlet port 311 and the liquid outlet port 312. The heat exchange medium enters the inside of the liquid cooling plate 31 through the liquid inlet port 311, exchanges heat with the outer shell 12, and then is discharged from the liquid outlet port 312. The liquid inlet port 311 and the liquid 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 liquid inlet port 311 and the liquid outlet port 312 are located on the same side wall of the liquid cooling plate 31, a partition plate 313 is arranged in the cavity of the liquid cooling plate 31 to divide the cavity into a U-shaped flow channel. The liquid inlet port 311 and the liquid outlet port 312 are in communication with the U-shaped flow channel.

[0114] In this embodiment, the liquid inlet port 311 and the liquid outlet port 312 of the liquid cooling plate 31 are arranged on the same side wall of the liquid cooling plate 31, and the liquid inlet port 311 is located below the liquid outlet port 312. After the liquid cooling plate 31 is installed, the liquid inlet port 311 of the liquid cooling plate 31 is close to the bottom of the outer shell 12, and the liquid outlet port 312 is close to the top of the outer shell 12. Since the temperature of the heat exchange medium of the liquid inlet port 311 is lower than that of the liquid 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 of the top of the battery module 1 has been treated by the first heat exchange device 2, the arrangement improves the balance of the temperature at different positions of the entire battery module 1.

[0115] In order to improve the support strength of the liquid cooling plate 31, the liquid cooling plate 31 of metal material is preferred in this embodiment. When the outer shell 12 is electrified, insulation should be ensured between the liquid cooling plate 31 and the outer shell 12. The outer shell 12 or the liquid cooling plate 31 can be insulated, such as coating an insulating material on the surface of the outer shell 12 or the liquid cooling plate 31, or spraying insulating paint on the surface of the outer shell 12 or the liquid cooling plate 31, or adding an insulating pad between the two, or using an insulating material with high hardness to prepare the liquid cooling plate 31, but the support strength of the liquid cooling plate 31 should be ensured.

[0116] 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, adhesion with a heat-conducting glue with good heat-conducting performance is preferred.

[0117] 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 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 of the first heat exchange device 2 is communicated with the liquid outlet port 312 of the liquid cooling plate 31. After the series connection, 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 installation, disassembly and maintenance of the battery module assembly, and also reduces the leakage problem caused by too many pipeline joints.

[0118] 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 connected to the external temperature control pipeline respectively.

[0119] The first heat exchange device 2 and the second heat exchange device 3 exchange heat with the battery module 1 at different locations. After absorbing heat in the first heat exchange device 2 and the second heat exchange device 3, the heat exchange medium is transferred to an external heat treatment device through a temperature control pipeline for processing. The heat treatment device is a device with heating and / or cooling functions, used to increase or decrease the temperature of the heat exchange medium. For example, the heat treatment device is specifically a heater, a chiller, or a refrigerator or water chiller with a compressor.

[0120] 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.

[0121] If the heat exchange medium in the second heat exchange device 3 is a non-insulating heat exchange medium, while the heat exchange medium in the first heat exchange device 2 is an insulating heat exchange medium, and the first heat exchange device 2 and the second heat exchange device 3 are filled with different heat exchange media, then different temperature control pipelines and different heat treatment devices are used to connect to the first heat exchange device 2 and the second heat exchange device 3 respectively. In this case, 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.

[0122] Example 2

[0123] like Figure 13 As shown, in this embodiment, based on the battery module 1 in Embodiment 1 above, an insulating sealant layer 16 is laid on the top of the outer casing 12. The main body of the first heat exchange device 2 is located within the insulating sealant layer 16, and both the liquid inlet and outlet ends of the first heat exchange device 2 are exposed above the insulating sealant layer 16. Simultaneously, the insulating sealant layer 16 also fills the space between the polarity terminal 111 and the sealing connector 14. In this embodiment, the electrical connection portions of all polarity terminals 111 extend beyond the insulating sealant layer 16 to facilitate connection with the electrical connection assembly 13.

[0124] Laying an insulating sealant layer 16 on top of the battery module 1 has at least the following advantages:

[0125] 1. Further improve the sealing performance of the first heat exchange device 2; specifically, the insulating sealant constituting the insulating sealant layer 16 penetrates into the tiny gap between the first heat exchange device 2 and the polar terminal 111 (the insulating sealant cannot enter the inner cavity of the heat exchange channel through the tiny gap), and further seals the gap radially.

[0126] Second, secondary sealing of the first relief hole 1211 site; even if there is a small gap between the sealing connector 14 and the shell of the single battery 11 and the top plate of the cylinder 121 (the gap does not allow the insulation sealant to pass), fill the insulation sealant in the space between the polar terminal 111 and the sealing connector 14, and also seal such small gaps to further improve the sealing of the first relief hole 1211 site;

[0127] Third, anti-condensation; during long-term use, due to the temperature difference inside and outside the first heat exchange device 2, condensation will be produced on the surface, and when the condensation accumulates to a certain amount, it may cause short circuit problems; the first heat exchange device 2 is wrapped with an insulation sealant layer 16, and when condensation is produced on the surface of the first heat exchange device 2, it can prevent the battery from short-circuiting under the protection of the insulation sealant layer 16;

[0128] Fourth, improve the stability of the first heat exchange device 2; because the first heat exchange device 2 is completely wrapped with an insulation sealant layer 16, the stability of the first heat exchange device 2 on the battery module 1 can be further improved.

[0129] In other embodiments, the electrical connection assembly 13 can be connected to the polar terminal 111, and then the insulation sealant layer 16 can be laid on the top of the battery module 1, that is, the insulation sealant layer 16 completely covers the polar terminal 111 of the single battery 11 and the connection site of the electrical connection assembly 13 and the polar terminal 111; in the entire battery module 1, after the cylinder 121 is insulated, only the electrical connection terminal of the electrical connection assembly 13 (used to realize the series connection of the battery module 1) is exposed and charged, and the rest is insulated, so that such a battery module 1 has higher safety performance.

[0130] In order to prevent overflow during the glue injection process, the local structure of the cylinder 121 is used as a glue stop plate, and in the z direction, the height of the side plate of the cylinder 121 is higher than the height of the top plate of the cylinder 121. The part of the cylinder 121 side plate higher than the top plate of the cylinder 121 is used as a glue stop plate.

[0131] As Figure 14As shown, based on the above structure, this embodiment also provides an insulating protective cover 17 on the top of the battery module 1, thereby providing insulation protection for the polarity terminal 111 and the first heat exchange device 2. This avoids potential safety hazards caused by the exposed polarity terminal 111 during the operation of the battery module 1, and also prevents foreign objects from falling into the polarity terminal 111 and causing a short circuit in the battery module 1, thus improving the safety of the battery module 1. It should be noted that if the insulating protective cover 17 completely covers the polarity terminal 111, it would make electrical connection of this type of battery module 1 more difficult. Therefore, this embodiment opens a slit on the side wall of the insulating protective cover 17, through which the electrical connector can be connected to the polarity terminal 111 of the battery module 1, thereby achieving electrical connection. It should also be noted that the side wall of the insulating protective cover 17 also needs to be provided with channels for the liquid inlet and outlet of the first heat exchange device 2 to extend out.

[0132] Example 3

[0133] like Figures 15 to 17 As shown, the battery module assembly in this embodiment is similar to the battery module assemblies in Embodiments 1 and 2, except that the structure of the first heat exchange device 2 in this embodiment is different. The first heat exchange device 2 in this embodiment is implemented through the following structure:

[0134] like Figure 15 As shown, the first heat exchange device 2 in this embodiment includes a hollow box 27 with one open end. To ensure the regularity of the battery module 1 structure, components whose shape and size are adapted to the top plate of the cylinder 121 are typically used as the first heat exchange device 2. In this embodiment, the top plate of the cylinder 121 is a rectangular plate, so the hollow box 27 is a cubic box. Second clearance holes 274 are provided on the hollow box 27 opposite to the open end of the cubic box to correspond to the polarity terminals 111 of each individual battery 11. The first heat exchange device 2 of this structure is fixed to the cylinder 121. When at the top, it is fastened to the top of the cylinder 121, and the open end is fixedly sealed to the cylinder 121; in the z direction, the polar terminal 111 penetrates the first heat exchange device 2, that is, part of the structure of the polar terminal 111 is located inside the first heat exchange device 2, directly in contact with the insulating heat exchange medium, and the polar terminal 111 is sealed with the corresponding second clearance hole 274; the other part of the structure of the polar terminal 111 is located outside the first heat exchange device 2, and is connected to the electrical connection assembly 13; the cavity formed by the hollow box 27 and the top plate of the cylinder 121 serves as a heat exchange channel.

[0135] In the heat exchange channel formed by the hollow box 27, the insulating heat exchange medium not only directly exchanges heat with the polar terminals 111 of each single battery 11, but also directly contacts the top plate of the cylinder body 121. The insulating heat exchange medium can also directly act on the top plate of the cylinder body 121, further improving the heat exchange effect of the insulating heat exchange medium on each single battery 11, and having a better heat exchange effect on the battery module 1.

[0136] As shown in Figure 16 and Figure 17 , in this embodiment, a hollow box 27 with one end open and made of insulating material is selected. The hollow box 27 is buckled on the top plate of the cylinder body 121. In order to ensure that the electrical connection part of each single battery 11 polar terminal 111 can smoothly pass through the corresponding second avoiding hole 274 of the hollow box 27, the area of the second avoiding hole 274 in the xy plane needs to be slightly larger than the area of the corresponding polar terminal 111 electrical connection part in the xy plane, and in the z direction, it needs to be ensured that the corresponding polar terminal 111 electrical connection part can smoothly pass through the corresponding second avoiding hole 274.

[0137] Generally, the shape of the second avoiding hole 274 is matched with the cross-sectional shape of the electrical connection part of the polar terminal 111. If the second avoiding hole 274 is a round hole and the cross-section of the electrical connection part of the polar terminal 111 is circular, then the diameter of the second avoiding hole 274 needs to be slightly larger than the outer diameter of the electrical connection part of the polar terminal 111. If the second avoiding hole 274 is a square hole and the cross-section of the electrical connection part of the polar terminal 111 is square, then the area of the second avoiding hole 274 needs to be slightly larger than the cross-sectional area of the electrical connection part of the polar terminal 111. Of course, the shape of the second avoiding hole 274 can also not be matched with the cross-sectional shape of the electrical connection part of the polar terminal 111. It only needs to ensure that the electrical connection part of the polar terminal 111 can smoothly pass through the corresponding second avoiding hole 274 and can realize the sealing between them.

[0138] When the insulating heat exchange medium is a liquid insulating heat exchange medium, the sealing performance of the hollow box 27 is particularly important. In order to ensure the sealing performance of the hollow box 27, Figure 17 It can be seen that in this embodiment, a step structure is arranged on each polar terminal 111 along the circumferential direction, and a sealing glue layer is laid on the step surface. When the electrical connection part of the polar terminal 111 protrudes through the corresponding second avoiding hole 274 of the hollow box 27, the area around the second avoiding hole 274 of the hollow box 27 is crimped on the sealing glue layer, and at the same time, the sealing glue layer penetrates into the gap between the second avoiding hole 274 and the polar terminal 111, realizing the sealing between the polar terminal 111 and the second avoiding hole 274. In other embodiments, an O-shaped sealing ring 28 can also be sleeved between the polar terminal 111 and the second avoiding hole 274 to realize the sealing between them.

[0139] In this embodiment, the first heat exchange device 2 is easily in contact with the outer casing 12 and the polar terminals 111 of each individual battery cell 11. If the first heat exchange device 2 is conductive, a short circuit problem will occur. Therefore, in this embodiment, the first heat exchange device 2 is preferably made of insulating material. When a non-insulating material is used, an insulating sealing ring can be added between the polar terminal 111 and the first heat exchange device 2 to overcome this problem. Alternatively, the first heat exchange device 2 can be insulated, for example, by spraying insulating paint or wrapping it with an insulating film. For safety, multiple insulation methods can be combined to overcome this problem.

[0140] In some other embodiments, a hollow box 27 with one open end made of metal can be selected. In order to ensure the insulation between the polar terminal 111 and the second clearance hole 274, an O-ring can be added between them to achieve insulation and sealing. The open end of the hollow box 27 and the cylinder 121 can be sealed and fixed by welding.

[0141] like Figure 16 and Figure 17 As shown, to further improve the sealing performance of the first heat exchange device 2, the hollow housing 27 can adopt the following structure: the hollow housing 27 includes a sealing top plate 271, two first side plates 273, and two second side plates 272. The first side plates 273 are parallel to the yz plane, and the second side plates 272 are parallel to the xz plane. When manufacturing the cylinder 121, the two second side plates 272 are integrally formed with the cylinder 121. When constructing the first heat exchange device 2, only the sealing top plate 271 and the first side plates 273 of the hollow housing 27 need to be fixed. In this structure, only the sealing top plate 271 needs to be insulated.

[0142] Example 4

[0143] like Figures 18 to 20 As shown, the battery module assembly in this embodiment is similar to the battery module assemblies in Embodiments 1 and 2, except that the structure of the first heat exchange device 2 in this embodiment is different. The first heat exchange device 2 in this embodiment is implemented through the following structure:

[0144] The first heat exchange device 2 includes at least one heat exchange plate 24. The heat exchange plate 24 has a first channel 25 extending in the x direction and at least one set of second channels 26 arranged in the x direction. The first channel 25 in the heat exchange plate 24 serves as a heat exchange channel, and each second channel 26 is connected to the first channel 25 in the z direction. The polar terminals 111 of each individual battery 11 pass through the second channels 26 in the z direction and are electrically connected to the electrical connection assembly 13. Part of the structure of the polar terminals 111 of each individual battery 11 is located in the heat exchange channel and is in direct contact with the insulating heat exchange medium. The sidewalls of the polar terminals 111 of each individual battery 11 are sealed with the heat exchange plate 24.

[0145] The first heat exchange device 2 is described in detail below in combination with the drawings and specific embodiments.

[0146] a、as Figure 18 and Figure 19 shown, the first heat exchange device 2 includes two heat exchange plates 24 arranged along the y direction, each heat exchange plate 24 corresponding to the polarity terminals 111 of all single batteries 11 located on the same side in the battery module 1;

[0147] Each heat exchange plate 24 is provided with a first channel 25 and a group of second channels 26 arranged along the x direction, the number of second channels 26 being consistent with the number of single batteries 11; the first channel 25 penetrates along the x direction; the second channel 26 penetrates along the z direction and is connected to the first channel 25; the polarity terminals 111 of all single batteries 11 located on one side respectively pass through the second channels 26 on one heat exchange plate 24 to realize electrical connection with the electrical connection assembly 13, and the polarity terminals 111 of all single batteries 11 located on the other side respectively pass through the second channels 26 on the other heat exchange plate 24 to realize electrical connection with the electrical connection assembly 13, and meanwhile, the two ports of each second channel 26 are sealed with the polarity terminals 111.

[0148] Two heat exchange plates 24 are respectively sleeved on the polarity terminals 111 on different sides in the battery module 1, 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.

[0149] b、as Figure 20 and Figure 21 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; the number of second channels 26 is twice the number of single batteries 11, and each second channel 26 penetrates along the z direction and is connected to the first channel 25; the polarity terminals 111 of all single batteries 11 in the battery module 1 respectively pass through the second channels 26 on the heat exchange plate 24 to realize electrical connection with the electrical connection assembly 13, and meanwhile, the two ports of the second channel 26 are sealed with the polarity terminals 111.

[0150] The cross-sectional shape of the heat exchange plate 24 is not specifically limited in the utility model, since the heat exchange plate 24 in the embodiment is placed in a planar top plate structure, considering the structural regularity, it can be seen from the figure that the heat exchange plate 24 in the embodiment is a rectangular plate. In some other embodiments, heat exchange plates 24 of other structural forms can also be used.

[0151] The first channel 25 is a channel opened in the length direction of the heat exchange plate 24, and after the heat exchange plate 24 is fixed on the top of the cylinder body 121, the length direction of the heat exchange plate 24 is consistent with the length direction of the cylinder body 121, so the first channel 25 can be considered to extend along the x direction, and the two end ports of the first channel 25 serve as the liquid inlet end and the liquid outlet end of the heat exchange plate 24.

[0152] The second channel 26 is a channel penetrating through the heat exchange plate 24 and communicating with the first channel 25, and in the utility model, the extension direction of the second channel 26 is consistent with the height direction of the single battery 11.

[0153] 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, and 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 extends out of the second channel 26 as an electrical connection part.

[0154] The shape of the port of the second channel 26 is adapted to 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 caliber 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.

[0155] After the first heat exchange device 2 is installed on the top of the cylinder body 121, the two ports of the first heat exchange device 2 serve as the liquid inlet end and the liquid outlet end respectively, in order to facilitate connection with the temperature control pipeline, the embodiment further connects the adapter pipe 21 to the liquid inlet end and the liquid outlet end of the first heat exchange device 2, and the adapter pipe 21 is connected with the temperature control pipeline.

[0156] As shown in Figure 22 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 are opened on each polarity terminal 111, the two second annular grooves are arranged along the z direction, and the O-shaped sealing ring 28 is embedded in the two second annular grooves, and the two O-shaped sealing rings 28 are 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.

[0157] It should be noted that when the heat exchange plate 24 contacts the outer shell 12 and the polarity terminals 111 of the plurality of single batteries 11, in order to avoid short circuit problems, the following methods can be used to realize insulation between the heat exchange plate 24 and the polarity terminal 111:

[0158] 3.1, the heat exchange plate 24 is made of insulating material, which can realize the insulation between the heat exchange plate 24 and the shell 12 and the polarity terminal 111, and realize the insulation between the heat exchange plate 24 and the top of the battery module 1.

[0159] 3.2, the heat exchange plate 24 is made of non-insulating material, and an insulating member ring is added between the polarity terminal 111 and the heat exchange plate 24; the side wall of the heat exchange plate 24 is insulated, such as spraying insulating paint, wrapping insulating film, etc.; for safety, multiple insulation methods can be combined to overcome this problem.

[0160] In this embodiment, the heat exchange plate 24 is made of insulating material, which realizes the insulation between the heat exchange plate 24 and the top of the shell 12 and the polarity terminal 111.

[0161] In order to further improve the stability of the heat exchange plate 24 after installation, the L-shaped connecting rib can be added between the heat exchange plate 24 and the cylinder 121, 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. The specific connection method can be selected according to the material of the heat exchange plate 24, for example, the heat exchange plate 24 in this embodiment is made of insulating material, so the L-shaped connecting rib and the heat exchange plate 24 and the cylinder 121 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 can be fixedly connected by welding.

[0162] Embodiment 5

[0163] As shown in Figures 23 to 26 , the battery module assembly in this embodiment is similar to the battery module assembly in embodiment 1 and embodiment 2, except that the structure of the first heat exchange device 2 of the battery module assembly in this embodiment is different. The first heat exchange device 2 in this embodiment is realized by the following structure:

[0164] As shown in Figures 23 to 24 , Figure 26 , the first heat exchange device 2 includes a connecting pipe assembly, the polarity terminal 111 of each single battery 11 is provided with a channel 112 penetrating the polarity terminal 111 along the x direction, and the connecting pipe assembly connects the channels 112 on the polarity terminals 111 of adjacent single batteries 11 to form a heat exchange channel, and at the same time, the connecting pipe assembly is insulated from the polarity terminals 111 of each single battery 11.

[0165] The polar terminal 111 here can be a monomer battery 11 pole, and when the height of the monomer battery 11 pole 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 a monomer battery 11 pole, which has a higher height than the conventional monomer battery 11 pole.

[0166] 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.

[0167] From Figure 24 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 on the same side, forming two heat exchange channels at the top of each monomer battery 11. At the same time, the channels 112 of the two polar terminals 111 of one outermost monomer battery 11 in the battery module 1 are connected by the sub-connecting pipe 22, realizing the series connection of the two heat exchange channels, forming a U-shaped heat exchange channel, and the free ends of the channels 112 of the two polar terminals of the other outermost monomer battery 11 (here, the free end is the port of the channel 112 without the sub-connecting pipe 22) can be directly used as 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.

[0168] In other embodiments, the two heat exchange channels can be connected in parallel, that is, the ports on one side of the two heat exchange channels are used as the liquid inlet end, and the ports on the other side of the two heat exchange channels are used as the liquid outlet end.

[0169] In order to facilitate connection with the temperature control pipeline, the embodiment also connects an adapter pipe 21 to the channel 112 of the polar terminal 111 which is the liquid inlet end and the liquid outlet end of the heat exchange channel, and realizes connection with the temperature control pipeline through the adapter pipe 21.

[0170] In the assembly, the two ends of the sub-connection pipe 22 are inserted into the two ports of the adjacent single battery polarity terminal channel 112 respectively. When the sub-connection pipe 22 adopts a pipe segment of hard material, it is required that the channels 112 on the adjacent single battery 11 polarity terminals 111 must be coaxial to achieve effective connection. However, in some cases, due to the existence of machining errors, it is difficult to guarantee the coaxiality of the channels 112 on the adjacent single battery 11 polarity terminals, therefore, the non-connection part of the sub-connection pipe 22 (here, the non-connection part refers to the part of the sub-connection pipe 22 which is not connected with the ports of the channel 112, and can also be understood as the middle segment of the sub-connection pipe 22) is preferably flexible, based on the deformation of the sub-connection pipe 22, to overcome the above machining errors, and facilitate the sealed connection of the sub-connection pipe 22 with the ports of the corresponding channel 112.

[0171] As shown in Figure 25 , in order to make the connection of the polarity terminals 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 polarity terminal 111, which can adopt the following structure:

[0172] First, the fixing part 113 is an annular boss integrally formed on the side wall of the polarity terminal 111 and protruding from the side wall of the polarity terminal 111, and the channel 112 passes through the annular boss;

[0173] a. As shown in Figure 25 , 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, i.e. 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;

[0174] In the connection, the sub-connection pipe 22 is sleeved on the outer wall of the first annular boss to realize the communication of the channels 112 between the single batteries 11, and in the specific connection, the sub-connection pipe 22 can be sleeved on the first annular boss by interference fit; the fixing part 113 of this structure can increase the heat exchange area for the passage of insulating heat exchange medium, and also facilitate quick and reliable connection with the sub-connection pipe 22.

[0175] b. The annular boss includes a second annular boss, 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, i.e. 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;

[0176] In the connection, the sub-connection pipe 22 is embedded into the inner wall of the second annular boss to realize the communication of the channels 112 between the single batteries 11, and in the specific connection, the sub-connection pipe 22 can be inserted into the second annular boss by interference fit;

[0177] 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 matched with the inner wall circumferential dimension of the sub-connection pipe 22, and the inner wall circumferential dimension of the second annular boss is matched with the outer wall circumferential dimension of the sub-connection pipe 22;

[0178] 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 surface and the outer wall surface of the sub-connection pipe 22 at the same time, thereby improving 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 a plurality of sealing contact surfaces between the sub-connection pipe 22 and the fixing part 113, thereby further improving the sealing performance and reliability of the connection.

[0179] Secondly, the fixing part 113 is a third annular groove arranged on the side wall of the polar terminal 111;

[0180] The shape of the third annular groove is similar to that of 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; wherein 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, thereby reducing the manufacturing cost of the polar terminal 111.

[0181] In addition, since the heat exchange channel flows with the insulating heat exchange medium, the sealing performance of the entire 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 fixing part 113 of the corresponding polar 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 material, the connection and sealing between the polar terminal 111 and the sub-connection pipe 22 can also be realized by welding, but attention should be paid to the insulation between the polar terminal 111 and the sub-connection pipe 22.

[0182] In order to further optimize the heat exchange effect, a functional structure 115 can also be arranged on the polar terminal 111, the functional structure 115 comprising a heat-conducting rib plate 114, a dot-shaped pit, a protrusion, etc. arranged on the inner wall of the channel 112; based on the heat-conducting rib plate 114, the dot-shaped pit, and the protrusion, the contact area between the insulating heat exchange medium and the polar terminal 111 can be increased, thereby effectively improving the heat exchange effect. Figure 25As shown, the embodiment is provided with a plurality of heat-conducting ribs 114 in the channel 112, which are evenly distributed circumferentially along the channel 112, and each of the heat-conducting ribs 114 extends axially along the channel 112. The heat-conducting ribs 114 can increase the contact area between the insulating heat exchange medium and the polarity terminal 111, i.e. increase the heat exchange area, and thus effectively improve the heat exchange effect. In other embodiments, the number and arrangement of the heat-conducting ribs 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.

[0183] It should be noted that:

[0184] 1. Since the polarity terminal 111 of the utility model directly contacts with 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, non-corrosive and other characteristics. In the utility model, the insulating heat exchange medium is the common insulating heat exchange medium in the prior art, which can be but not limited to insulating oil and fluorinated liquid.

[0185] 2. Since the above-mentioned connecting pipe assembly directly contacts with the polarity terminal 111, the sub connecting pipe 22 and the two polarity terminals 111 connected thereto must be insulated. The insulation can be realized in the following ways:

[0186] 2.1. Selecting the sub connecting pipe 22 made of insulating material;

[0187] 2.2. Using the sub connecting pipe 22 made of non-insulating material, which can be insulated by insulating the pipe wall, such as spraying insulating paint, wrapping insulating film, etc. The inner wall of the channel 112 connected with the sub connecting pipe 22 can also be insulated, such as spraying insulating paint, etc. An insulating sleeve can also be added between the sub connecting pipe 22 and the channel 112. Of course, in order to be safe, multiple insulation methods can be combined to realize the insulation between the sub connecting pipe 22 and the polarity terminal 111 of the channel 112.

[0188] 2.3. If the adapter pipe 21 is made of metal material, the insulation between the adapter pipe 21 and the polarity terminal 111 also needs to be realized. The specific insulation treatment can be realized by similar insulation methods as the sub connecting pipe 22.

Claims

1. A battery module assembly, comprising: The battery module, the first heat exchange device, and the second heat exchange device are provided. The battery module comprises 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 the outer shell and insulated from the outer shell and the single batteries. The second heat exchange device is arranged on at least one of the bottom and the sidewall of the outer shell and used for heat exchange with the outer shell of the battery module.

2. The battery module assembly of claim 1, wherein, The first heat exchange device is a hollow box with an open end, and the open end of the hollow box is sealingly fixed to the top plate of the outer shell.

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

4. The battery module assembly of claim 1, wherein, The part of the polarity 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.

5. The battery module assembly of any one of claims 1 to 4, wherein, The second heat exchange device comprises at least one liquid cooling plate arranged on the sidewall of the outer shell and used for heat exchange with the sidewall of the outer shell.

6. The battery module assembly of claim 5, 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.

7. The battery module assembly of claim 5, wherein, The first heat exchange device and the second heat exchange device are connected in series.

8. The battery module assembly of any one of claims 1 to 4, wherein, The top of the outer shell is provided with an insulating sealing adhesive layer, and the main part of the first heat exchange device is located in the insulating sealing adhesive layer.

9. The battery module assembly of any one of claims 1 to 4, wherein, The outer shell is provided with a venting channel, and the venting channel covers the venting part of each single battery.

10. The battery module assembly of claim 9, wherein, The outer shell comprises a cylinder with at least one open end at the top or the bottom, a top plate sealing the open end of the top of the cylinder, and a bottom plate sealing the open end of the bottom of the cylinder. The top plate is provided with a protrusion extending in the x direction, and the venting channel is formed in the protrusion.

Images