Battery module

Abstract

The utility model provides a battery module, which mainly solves the problem that the existing battery pack has potential safety hazards. The battery module comprises a battery pack and a pressure-bearing shell, the pressure-bearing shell is a closed pressure shell; the battery pack comprises a plurality of single batteries, and the plurality of single batteries are arranged in the pressure-bearing shell along the x direction and are connected in series through an electric connection assembly; a heat exchange device is arranged at the top of each single battery and is insulated from each single battery; the heat exchange device is provided with a heat exchange channel through which an insulated heat exchange medium passes; and the insulated heat exchange medium in the heat exchange channel is in direct contact with the polar terminals of the single batteries for heat exchange. The battery pack adopts a direct heat exchange mode, and the insulating heat exchange medium directly acts on the polarity terminals, so that the insulating heat exchange medium has a shorter heat exchange path, the utilization efficiency of the insulating heat exchange medium is further improved, the temperature control effect of the battery pack is improved, and the probability of thermal runaway of the battery pack is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a battery module. Background Art

[0002] Currently, battery packs are constructed by connecting multiple cells in series. These packs offer high integration and energy density. However, due to the high concentration of cells in a battery pack, a large amount of heat is generated during charging and discharging. This heat gradually accumulates. If the generated heat is not released promptly, it accumulates, causing uneven temperature in the battery pack, which reduces the pack's service life. In severe cases, the thermal balance of the cells in the pack is disrupted, leading to thermal runaway. This thermal runaway can easily cause combustion and, in severe cases, explosion, posing a safety hazard. Summary of the Invention

[0003] The utility model provides a battery module, which mainly solves the problem of potential safety hazards in existing battery packs.

[0004] In order to solve the above problems, the technical solution provided by the present invention is as follows:

[0005] A battery module comprises a battery pack and a pressure-bearing casing; the pressure-bearing casing is a closed pressure shell; the battery pack comprises a plurality of single cells, which are arranged in the pressure-bearing casing along the x-direction and connected in series via an electrical connection assembly; a heat exchange device is provided within the pressure-bearing casing, the heat exchange device is disposed on top of each single cell, and is insulated from each single cell; the heat exchange device has a heat exchange channel through which an insulating heat exchange medium passes, and the insulating heat exchange medium in the heat exchange channel is in direct contact with the polarity terminals of each single cell for heat exchange.

[0006] Furthermore, the pressure-bearing shell includes a box body with an open top and a top plate sealed at the open end of the top of the box body.

[0007] Furthermore, the electrical connection assembly includes a first electrical connector and a second electrical connector, and the polarity terminals of adjacent single cells with different polarities are electrically connected through the first electrical connector; the two second electrical connectors are respectively electrically connected to the polarity terminals of the single cells with different polarities at both ends of the battery pack; two electrical connection terminals are fixedly provided on the pressure-bearing shell, and the two second electrical connectors are respectively electrically connected to the two electrical connection terminals in a one-to-one correspondence.

[0008] Furthermore, the heat exchange channel is connected to the external pipeline through a transition tube, and the transition tube is integrally fixed to the pressure-bearing shell.

[0009] Further, the heat exchange device comprises a connecting pipe assembly, the through channel is arranged on the polar terminal of each single battery, the connecting pipe assembly connects the through channels on the polar terminals of adjacent single batteries to form a heat exchange channel, and the connecting pipe assembly is insulated from the polar terminals of the single batteries.

[0010] Further, the two ports of the through channel are provided with fixing portions fixed to the side walls of the polar terminals and connected to the connecting pipe assembly, and the inner wall of the through channel is provided with a heat conduction rib plate for increasing the heat exchange area.

[0011] Further, the heat exchange device comprises a plurality of sub heat exchange devices, each of which is arranged at the top of each single battery, and each of the sub heat exchange devices comprises at least one heat exchange pipe, each of which has a first through channel extending in the x direction and at least one second through channel; the polar terminals of each single battery are electrically connected to the electrical connection assembly in the z direction after penetrating through each sub heat exchange device, the first through channels of the sub heat exchange devices of adjacent single batteries are connected to form a heat exchange channel, and part of the structure of the polar terminals of each single battery is located in the heat exchange channel and directly contacts the insulating heat exchange medium.

[0012] Further, the sub heat exchange device comprises two heat exchange pipes arranged in the y direction, each of which is provided with a first through channel and a second through channel; the first through channel penetrates in the x direction; the second through channel penetrates in the z direction and is connected to the first through channel; the two polar terminals of the single battery are electrically connected to the electrical connection assembly after penetrating through the second through channels of the two heat exchange pipes, and the two ports of the second through channel are sealed from the polar terminals.

[0013] Further, the heat exchange device comprises at least one heat exchange plate, the heat exchange plate has a first through channel extending in the x direction and at least one group of second through channels arranged in the x direction, the first through channel in the heat exchange plate serves as a heat exchange channel, each second through channel penetrates in the z direction and is connected to the first through channel; the polar terminals of each single battery are electrically connected to the electrical connection assembly in the z direction after penetrating through the second through channels, and part of the structure of the polar terminals of each single battery is located in the heat exchange channel and directly contacts the insulating heat exchange medium.

[0014] Further, the heat exchange device comprises two heat exchange plates arranged in the y direction; each of the heat exchange plates is provided with a first through channel and a plurality of second through channels arranged in the x direction; the first through channel penetrates in the x direction; each second through channel penetrates in the z direction and is connected to the first through channel; each heat exchange plate corresponds to the polar terminals of all single batteries located on the same side in the battery pack, each polar terminal penetrates through the second through channel on the heat exchange plate and is electrically connected to the electrical connection assembly, and the two ports of the second through channel are sealed from the polar terminals.

[0015] Compared with the prior art, the technical scheme of the utility model has the advantages that:

[0016] 1. The battery module, an insulation heat exchange medium passes through a heat exchange channel arranged on the top of each single battery, the heat exchange channel mainly exchanges heat with the polarity terminal of the single battery with relatively concentrated heat, so as to realize reliable temperature control of each single battery in the battery pack. The battery pack adopts direct heat exchange mode, the insulation heat exchange medium in the heat exchange channel directly contacts with the polarity terminal of the single battery, the insulation heat exchange medium directly acts on the polarity terminal, so that the insulation heat exchange medium has a shorter heat exchange path, thereby improving the utilization efficiency of the insulation heat exchange medium, improving the heat exchange efficiency of the battery pack, improving the temperature control effect of the battery pack, reducing the probability of thermal runaway of the battery pack, and improving the safety of the battery pack in use.

[0017] Meanwhile, a pressure-bearing shell is additionally arranged outside the battery pack, the pressure-bearing shell has a certain pressure-bearing capacity, when the single battery occurs thermal runaway, the high-temperature and high-pressure thermal runaway flue gas and electrolyte generated by the single battery can be gathered in the pressure-bearing shell, so as to avoid the harm caused by the leakage of the high-temperature and high-pressure thermal runaway flue gas and electrolyte to the surrounding devices, and further improve the safety of the battery pack in use.

[0018] 2. In the battery module, the pressure-bearing shell comprises a box body with a top opening and a top plate sealingly arranged at the top opening end of the box body, and the structure of the top opening facilitates the assembly of the top heat exchange channel of the battery pack and the battery pack, and realizes the electrical connection between the single batteries.

[0019] 3. In the battery module, two electrical connection terminals are fixedly arranged on the pressure-bearing shell, the electrical connection terminals are electrically connected with the second electrical connection member in the electrical connection assembly, and the pressure-bearing performance of the pressure-bearing shell is further ensured.

[0020] 4. In the battery module, the heat exchange channel is connected with the external pipeline through an adapter pipe, and the adapter pipe is integrally fixed on the pressure-bearing shell, and the pressure-bearing performance of the pressure-bearing shell is further ensured.

[0021] 5. In the battery module, the polarity terminal of each single battery is provided with a channel penetrating through the polarity terminal, and the channel of the adjacent single battery polarity terminal is communicated by the connecting pipe assembly to form a heat exchange channel. Both ends of the channel are provided with a fixed part, and the fixed part realizes the quick and reliable connection between the polarity terminal and the connecting pipe assembly; meanwhile, the inner wall of the channel is provided with a heat-conducting rib plate for increasing the heat exchange area, the heat-conducting rib plate can increase the contact area of the insulation heat exchange medium and the polarity terminal, thereby increasing the heat exchange area and further improving the heat exchange effect.

[0022] 6. The battery module of the utility model, the heat exchange device adopts split type structure, namely the top of each single battery is equipped with sub heat exchange device respectively, the sub heat exchange device of adjacent single battery intercommunicates, forms heat exchange channel, this structure of setting up sub heat exchange device on single battery respectively, it is convenient for sub heat exchange device and single battery to install, also it is convenient for the realization of sealing between sub heat exchange device and single battery.

[0023] 7. The battery module of the utility model, the sub heat exchange device includes two heat exchange pipe fittings along y direction arrangement, so that the top of each single battery is equipped with two heat exchange pipe fittings respectively, each heat exchange pipe fitting is installed with single battery, and installation is very convenient, only the sub heat exchange device and single battery one polarity terminal realize cooperation installation can, simultaneously, the sub heat exchange device and single battery one polarity terminal realize sealing can, and sealing is very convenient and reliable.

[0024] 8. The battery module of the utility model, the battery pack top is equipped with the heat exchange device of carrying out heat exchange with the polarity terminal of all single batteries in the battery pack, the heat exchange device adopts integral type structure, relative to the structure of setting up heat exchange device on single battery respectively, its overall sealing is better, and it is also convenient for processing and manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the schematic diagram of the battery module in example 1;

[0026] Figure 2 It is the explosion drawing of the battery module in example 1;

[0027] Figure 3 It is the structural schematic diagram of single battery and electric connection assembly in example 1;

[0028] Figure 4 It is the structural schematic diagram of single battery polarity terminal being equipped with channel in example 1;

[0029] Figure 5 It is the structural schematic diagram of the top of each single battery being equipped with heat exchange channel in example 1;

[0030] Figure 6 It is the explosion schematic diagram of each single battery and sub connecting pipe connection in example 1;

[0031] Figure 7 It is the cross-sectional view of each single battery and sub connecting pipe connection in example 1;

[0032] Figure 8 It is the structural schematic diagram of single battery polarity terminal being equipped with fixed part in example 1 Figure 1 ;

[0033] Figure 9Explosive diagram of the connection of the polarity terminals of each monobloc battery to the sub-connection pipe in Example 1

[0034] Figure 10 Structure diagram of the monobloc battery polarity terminals provided with a fixing part in Example 1 Figure 2 ;

[0035] Figure 11 Structure diagram of the monobloc battery polarity terminals provided with a channel in Example 2 Figure 1 ;

[0036] Figure 12 Structure diagram of the monobloc battery top provided with a heat exchange device in Example 2 Figure 1 ;

[0037] Figure 13 Structure diagram of the monobloc battery polarity terminals provided with a channel in Example 2 Figure 2 ;

[0038] Figure 14 Structure diagram of the monobloc battery top provided with a heat exchange device in Example 2 Figure 3 ;

[0039] Figure 15 Structure diagram of the communication of the heat exchange devices of each monobloc battery top in Example 2

[0040] Figure 16 Cross-section of the monobloc battery top provided with a heat exchange device in Example 2 Figure 1 ;

[0041] Figure 17 Cross-section of the monobloc battery top provided with a heat exchange device in Example 2 Figure 2 ;

[0042] Figure 18 Diagram of the heat exchange device comprising two half-pipes in Example 2

[0043] Figure 19 Cross-section diagram of the heat exchange device comprising two half-pipes in Example 2

[0044] Figure 20 Diagram of the heat exchange device comprising one half-pipe in Example 2

[0045] Figure 21 Structure diagram of the monobloc battery provided with an explosion relief branch pipe in Example 2

[0046] Figure 22 Structure diagram of the battery pack provided with a channel in Example 3 Figure 1 ;

[0047] Figure 23 Structure diagram of the heat exchange plate in Example 3 Figure 1;

[0048] Figure 24 Structure diagram of the battery pack with channels in Example 3 Figure 2 ;

[0049] Figure 25 Structure diagram of the heat exchange plate in Example 3 Figure 2 ;

[0050] Figure 26 Sectional view of the battery pack with heat exchange device on the top in Example 3.

[0051] The figure marks: 1-battery pack, 2-pressure bearing shell, 3-electric connection assembly, 4-adapting pipe, 5-L-shaped connecting rib, 11-single battery, 12-sub connecting pipe, 13-heat exchange pipe fitting, 14-heat exchange plate, 15-first channel, 16-second channel, 17-0-shaped sealing ring, 18-explosion venting branch pipe, 19-explosion venting part, 111-polarity terminal, 112-channel, 113-fixing part, 114-heat conducting rib plate, 131-connecting pipe section, 21-box body, 22-top plate, 23-explosion venting mechanism, 31-first electric connecting piece, 32-second electric connecting piece, 33-electric connecting terminal. DETAILED DESCRIPTION

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

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

[0054] In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "top, bottom, etc." is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on 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.

[0055] The utility model provides a kind of battery module, to reduce the probability of thermal runaway of each single battery in battery module, heat exchange device is equipped in the top of each single battery, heat exchange device has the heat exchange passage of insulating heat exchange medium passing, the heat exchange passage mainly carries out heat exchange with the polarity terminal of each single battery heat more concentrated, direct heat exchange mode is used when heat exchanging, i.e.

[0056] Example 1

[0057] As Figures 1 to 3 shown, the utility model provides a kind of battery module, which comprises battery pack 1 and pressure containment shell 2;The pressure containment shell 2 is closed pressure shell, specifically including the box 21 of top opening and the top plate 22 of sealing being arranged in the top opening end of box 21.The battery pack 1 includes a plurality of single batteries 11, the number of single battery 11 can be adjusted according to actual demand, a plurality of single batteries 11 are arranged in the same direction in pressure containment shell 2, and are connected in series by electric connection assembly 3, the pressure containment shell is insulated between each single battery, the insulation can be specifically provided with insulation layer on the inner wall of pressure containment shell, or, increase insulation layer on the shell of each single battery, or, increase insulating pad between single battery and pressure containment shell;At the same time, heat exchange device is equipped in pressure containment shell 2, heat exchange device is arranged in the top of each single battery 11, and heat exchange device is insulated between each single battery, the insulation here specifically refers to the part of heat exchange device and the polarity terminal of each single battery 11, the shell of each single battery is contacted and insulated.The heat exchange device has the heat exchange passage 112 of insulating heat exchange medium passing, and the insulating heat exchange medium in the heat exchange passage 112 is directly contacted with the polarity terminal 111 of each single battery 11 and exchanges heat.

[0058] The heat exchange passage 112 is filled with an insulating heat exchange medium, which directly contacts the polarity terminal 111, so as to realize temperature control of the battery pack 1. When the temperature of the battery pack 1 is higher than a set threshold, the battery pack 1 is cooled by filling the heat exchange passage 112 with an insulating heat exchange medium with a lower temperature; when the temperature of the battery pack 1 is lower than the set threshold, the battery pack 1 is heated by filling the heat exchange passage 112 with an insulating heat exchange medium with a higher temperature; by controlling the temperature of the insulating heat exchange medium, the battery pack 1 can always operate at a normal working temperature.

[0059] For the convenience of description, the arrangement direction of the single battery 11 is defined as the x direction, the height direction of the single battery 11 is defined as the z direction, and the direction perpendicular to the x direction and the z direction is defined as the y direction.

[0060] The heat exchange device and the heat exchange passage 112 in the embodiment are realized by the following structure:

[0061] As shown in Figure 4 , the heat exchange device in the embodiment includes a connecting pipe assembly, the polarity terminal 111 of each single battery 11 is provided with a passage 112 penetrating the polarity terminal 111 in the x direction, the connecting pipe assembly connects the passages 112 on the polarity terminals 111 of adjacent single batteries 11, forms the heat exchange passage 112, and is insulated from the polarity terminals 111 of each single battery 11.

[0062] The polarity terminal 111 described herein can be a single battery 11 pole, and when the height of the single battery 11 pole does not meet the set requirements, a pole adapter can be connected to the single battery 11 pole, and the whole structure of the single battery 11 pole and the pole adapter is taken as the single battery 11 polarity terminal 111. The polarity terminal 111 in the embodiment is a single battery 11 pole, which has a higher height compared with a conventional single battery 11 pole.

[0063] The shape of the polarity terminal 111 of each single battery 11 is not limited in the embodiment, and the cross section thereof can be square, circular or the like. Meanwhile, the cross section of the passage 112 is also not limited, and a passage 112 with a relatively regular structure such as a circular or square cross section can be generally used. In addition, the cross section area of the passage 112 in the embodiment is not too large, provided that the conductivity of the polarity terminal 111 is not affected; and the cross section area of the passage 112 is also not too small, so as to not affect the heat exchange effect due to a too small heat exchange area. The cross section area of the passage 112 can be as large as possible provided that the conductivity of the polarity terminal 111 is not affected, so as to increase the heat exchange area and improve the heat exchange effect.

[0064] In combination with Figure 5 , Figure 6 and Figure 7As can be seen, the connecting pipe assembly of this embodiment includes multiple sections of sub-connecting pipes 12; the two ends of each section of the sub-connecting pipe 12 are respectively connected to the polarity terminals 111 and the channels 112 of the adjacent single cells 11 located on the same side, forming two heat exchange channels 112 at the top of the battery pack 1. At the same time, the sub-connecting pipe 12 is used to connect the channels 112 of the two polarity terminals 111 of one outermost single cell 11 in the battery pack 1, thereby realizing the series connection of the two heat exchange channels 112 to form a U-shaped heat exchange channel 112. The free ends of the channels 112 of the two polarity terminals 111 of the other outermost single cell 11 (the free ends mentioned here are the ends of the channels 112 not connected to the sub-connecting pipe 12) can directly serve as the two ends of the U-shaped heat exchange channel 112, and the two ends of the U-shaped heat exchange channel 112 serve as the liquid inlet and outlet, respectively.

[0065] In some other embodiments, the two heat exchange channels 112 can be connected in parallel, that is, the ports of the two heat exchange channels 112 on one side are used as liquid inlets, and the ports of the two heat exchange channels 112 on the other side are used as liquid outlets.

[0066] like Figure 5 and Figure 6 As shown, to facilitate connection to external piping, this embodiment also connects a transfer tube 4 to the free ends of the channels 112 of the polarity terminals 111, which serve as the liquid inlet and outlet. Connection to the external piping is achieved via the transfer tube 4. During installation, the transfer tube 4 passes through the pressure-bearing housing 2 and connects to the external piping. To further ensure the pressure-bearing performance of the pressure-bearing housing 2, the transfer tube 4 is integrally formed with the pressure-bearing housing 2. For example, the transfer tube 4 can be welded to the pressure-bearing housing 2. Furthermore, the non-connecting portions of the transfer tube 4 preferably have a certain degree of flexibility. Deformation of the transfer tube 4 facilitates connection between the transfer tube 4 and the pressure-bearing housing 2 and the polarity terminals 111, respectively, while also facilitating a sealed connection between the transfer tube 4 and the corresponding channel 112 ports.

[0067] During assembly, the two ends of the sub-connecting tube 12 are respectively inserted into the two ports of the channel 112 of the polarity terminal 111 of the adjacent single battery 11. When the sub-connecting tube 12 is made of a hard material, the channels 112 on the polarity terminals 111 of the adjacent single battery 11 must be coaxial to achieve effective connection. However, in some cases, due to manufacturing errors, it is difficult to ensure the coaxiality of the channels 112 on the polarity terminals 111 of adjacent single battery 11. Therefore, in this embodiment, the non-connecting portion of the sub-connecting tube 12 (herein, the non-connecting portion refers to the portion of the sub-connecting tube 12 that is not connected to the end of the channel 112, which can also be understood as the middle section of the sub-connecting tube 12) preferably has a certain degree of flexibility. Based on the deformation of the sub-connecting tube 12, this processing error is overcome, facilitating the sealed connection between the sub-connecting tube 12 and the corresponding end of the channel 112.

[0068] In addition, in order to make the connection between the polarity terminal 111 of each single battery 11 and the sub-connecting tube 12 more reliable, a fixing portion 113 may be provided on the side wall of the polarity terminal 111. The fixing portion 113 may specifically adopt the following structure:

[0069] First, the fixing portion 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. At the same time, the channel 112 passes through the annular boss;

[0070] a. Figure 8 As shown, the annular boss includes a first annular boss, and the outer circumferential size of the first annular boss is adapted to the inner circumferential size of the sub-connecting pipe 12, that is, the outer circumferential size of the first annular boss is consistent with the inner circumferential size of the sub-connecting pipe 12, or is slightly smaller than the inner circumferential size of the sub-connecting pipe 12;

[0071] like Figure 9 As shown, when connected, the sub-connecting pipe 12 is sleeved on the outer wall of the first annular boss to realize the communication of the channels 112 between the single cells 11. When connected specifically, the sub-connecting pipe 12 can be sleeved on the first annular boss through interference fit; the fixing portion 113 of this structure can increase the heat exchange area through which the insulating heat exchange medium passes, and at the same time, it is also convenient for quick and reliable connection with the sub-connecting pipe 12.

[0072] 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-connecting pipe 12, that is, the inner wall circumferential dimension of the second annular boss is consistent with the outer wall circumferential dimension of the sub-connecting pipe 12, or slightly smaller than the outer wall circumferential dimension of the sub-connecting pipe 12;

[0073] During connection, the sub-connecting tube 12 is embedded in the inner wall of the second annular boss to achieve communication between the channels 112 of the single cells 11. Specifically, during connection, the sub-connecting tube 12 can be inserted into the second annular boss through interference fit.

[0074] c. The annular boss includes a first annular boss and a second annular boss. The outer circumferential dimension of the first annular boss matches the inner circumferential dimension of the sub-connecting pipe 12 , and the inner circumferential dimension of the second annular boss matches the outer circumferential dimension of the sub-connecting pipe 12 .

[0075] When connected, the sub-connection pipe 12 is clamped in the ring groove between the first annular boss and the second annular boss, at this time, the inner wall of the sub-connection pipe 12 is in contact with the outer wall of the first annular boss, and the outer wall of the sub-connection pipe 12 is in contact with the inner wall of the second annular boss; the fixing part 113 of this structure can fix the inner wall and the outer wall of the sub-connection pipe 12 at the same time, thereby improving the stability of the connection between the sub-connection pipe 12 and the polar terminal 111. At the same time, the fixing part 113 of this structure forms a plurality of sealing contact surfaces between the sub-connection pipe 12 and the fixing part 113, thereby further improving the sealing performance and reliability of the connection.

[0076] Second, as shown in Figure 10 The fixing part 113 is an annular groove arranged on the side wall of the polar terminal 111;

[0077] The shape of the annular groove is similar to that of the sub-connection pipe 12, and the groove width of the annular groove is consistent with or slightly smaller than the wall thickness of the sub-connection pipe 12; wherein the groove width of the annular groove refers to the radial dimension of the annular groove. When connected, the end of the sub-connection pipe 12 is embedded in the 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.

[0078] In addition, since the heat exchange channel 112 flows with the insulating heat exchange medium, the sealing performance of the entire heat exchange channel 112 is particularly important. In order to ensure the sealing performance of the heat exchange channel 112, the sub-connection pipe 12 and the fixing part 113 of the corresponding polar terminal 111 are connected in an interference fit. 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 12 is made of metal, the polar terminal 111 and the sub-connection pipe 12 can be sealed by welding, but attention should be paid to the insulation between the polar terminal 111 and the sub-connection pipe 12.

[0079] As shown in Figure 8 In order to further optimize the heat exchange effect, the heat exchange channel 112 can further be provided with a plurality of heat-conducting rib plates 114 in the embodiment, the plurality of heat-conducting rib plates 114 are uniformly distributed along the circumference of the channel 112, and each heat-conducting rib plate 114 extends along the axis of the channel 112. The heat-conducting rib plate 114 can increase the contact area between the insulating heat exchange medium and the polar terminal 111, i.e. increase the heat exchange area, thereby effectively improving the heat exchange effect. In other embodiments, according to the size of the channel 112, the number and arrangement of the heat-conducting rib plates 114 can be adjusted, provided that the flow of the insulating heat exchange medium is not affected.

[0080] It should be noted that:

[0081] 1. In the utility model, the polarity terminal 111 directly contacts with the insulation heat exchange medium, and the ideal insulation 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 other characteristics. In the utility model, the insulation heat exchange medium is the common insulation heat exchange medium in the prior art, which can be but not limited to insulation oil and fluorinated liquid.

[0082] 2. Since the sub connecting pipe 12 directly contacts with the polarity terminal 111, the sub connecting pipe 12 and the two polarity terminals 111 connected therewith must be insulated, and the insulation can be realized in the following ways:

[0083] 2.1, the sub connecting pipe 12 of insulating material is selected;

[0084] 2.2, the sub connecting pipe 12 of non-insulating material can be insulated, for example, the pipe wall of the sub connecting pipe 12 is insulated by spraying insulating paint, wrapping insulating film and the like; the inner wall of the channel 112 connected with the sub connecting pipe 12 can also be insulated, for example, by spraying insulating paint; an insulating sleeve can also be added between the sub connecting pipe 12 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 12 and the polarity terminal 111 of the channel 112.

[0085] 2.3, if the pressure shell 2 is made of metal material, the insulation between the adapter pipe 4 and the pressure shell 2 also needs to be realized, and the corresponding insulation treatment can be realized by adopting the similar insulation method as that between the sub connecting pipe 12 and the polarity terminal 111.

[0086] When assembling the battery pack 1, the channels 112 on the polarity terminals 111 of each single battery 11 are connected by the connecting pipe assembly, and then the electrical connection between each single battery 11 is realized by the electrical connection assembly 3. The electrical connection assembly 3 in the embodiment includes a first electrical connection piece 31 and a second electrical connection piece 32, the first electrical connection piece 31 is used to realize the series connection between each single battery 11 in the battery pack 1, and the second electrical connection piece 32 realizes the electrical connection between the battery pack 1 and the external equipment. Each single battery 11 in the battery pack 1 can be connected in series by the following ways:

[0087] First, the positive polarity terminals 111 of each single battery 11 are located on the same side of the single battery 11, and the negative polarity terminals 111 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 31 arranged obliquely to the x direction, and the two second electrical connecting members 32 are electrically connected with the single batteries 11 at both ends of the battery pack 1, and the two second electrical connecting members 32 pass through the pressure-bearing shell 2 and are respectively used as the electrical connecting terminals 33 externally connected to the battery pack 1;

[0088] Second, the adjacent single batteries 11 have different polarities of the same side polarity terminals 111, that is, the positive polarity terminal 111 of one of the adjacent two single batteries 11 and the negative polarity terminal 111 of the other single battery 11 are located on the same side of the battery pack 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 same side of the adjacent single batteries 11 are electrically connected through the first electrical connecting member 31 arranged parallel to the x direction; the two second electrical connecting members 32 are electrically connected with the single batteries 11 at both ends of the battery pack 1, and the two second electrical connecting members 32 pass through the pressure-bearing shell 2 and are respectively used as the electrical connecting terminals 33 externally connected to the battery pack 1;

[0089] The first electrical connecting member 31 is 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 be fixed on the polarity terminals 111 of each single battery 11 by screws to achieve electrical connection.

[0090] The second electrical connecting member 32 is two, which are respectively electrically connected with the polarity terminals 111 of the single batteries 11 at both ends of the battery pack 1, and then pass through the pressure-bearing shell 2 and are used as the electrical connecting terminals 33 externally connected to the entire battery pack 1. The pressure-bearing shell 2 is provided with a through hole through which the second electrical connecting member 32 passes, and after the second electrical connecting member 32 passes through the pressure-bearing shell 2, it is used as the electrical connecting terminal 33 for electrical connection between the entire battery pack 1 and external equipment.

[0091] When the second electrical connecting member 32 passes through the pressure-bearing shell 2 as the externally connected electrical connecting terminal 33, it needs to be insulated from the pressure-bearing shell 2, which can be specifically insulated by insulating the non-electrically connected part of the second electrical connecting member 32, such as spraying insulating paint or wrapping insulating film; the inner wall of the through hole of the pressure-bearing shell 2 can also be insulated, such as spraying insulating paint; an insulating sleeve can also be added between the pressure-bearing shell 2 and the second electrical connecting member 32; of course, for safety, multiple insulation methods can be combined to achieve insulation between the second electrical connecting member 32 and the pressure-bearing shell 2.

[0092] As Figure 2 shown, the pressure-containing shell 2 in the embodiment is a closed pressure shell, which mainly integrates and installs the battery pack 1, and also protects the battery pack 1. Unlike the general battery pack 1 shell, the pressure-containing shell 2 in the utility model is a closed pressure shell, which is a sealed shell and can withstand a certain pressure. When the single battery 11 is in thermal runaway, the pressure-containing shell 2 can ensure that the thermal runaway flue gas does not leak from the pressure-containing shell 2, thereby avoiding harm to the devices near the battery module.

[0093] The shape and size of the pressure-containing shell 2 can be designed according to the application scenario of the battery module to facilitate placement. In the embodiment, the pressure-containing shell 2 is a rectangular shell, which includes a box body 21 with an open top and a top plate 22 sealingly arranged at the open top end of the box body 21. The top of the box body 21 is open, and after the battery pack 1 is placed in the box body 21, the top plate 22 is sealingly fixed (welded) to the open end of the top of the box body 21. The pressure-containing shell 2 has good pressure resistance, and the box body 21 can be integrally formed to have good pressure resistance. In addition, the open-top structure facilitates the assembly of the top heat exchange channel 112 of the battery pack 1 and the electrical connection of the single batteries 11.

[0094] In addition, the pressure-containing shell has a certain pressure-bearing capacity. To ensure the pressure-bearing performance of the entire pressure-containing shell, two electrical connection terminals 33 can be additionally fixed on the pressure-containing shell. The electrical connection terminals 33 are integrated with the pressure-containing shell and serve as the total positive and total negative of the battery pack. The two second electrical connection pieces 32 are respectively and correspondingly electrically connected to the two electrical connection terminals 33. When the electrical connection terminals 33 are arranged on the box body 21 of the pressure-containing shell, the second electrical connection pieces 32 are first electrically connected to the single battery polarity terminals, and then the second electrical connection pieces 32 are respectively and correspondingly electrically connected to the two electrical connection terminals 33. After electrical connection is completed, the top plate 22 is sealingly connected to the box body 21.

[0095] As Figure 1 shown, the pressure-containing shell 2 further comprises a pressure relief mechanism 23. The thermal runaway flue gas in the pressure-containing shell 2 is discharged from the pressure-containing shell 2 through the pressure relief mechanism 23. The pressure relief mechanism 23 specifically comprises a pressure relief pipe and a pressure relief membrane. The pressure relief pipe is connected to the pressure relief port of the pressure-containing shell 2, and the pressure relief membrane is arranged on the pressure relief pipe or the pressure relief port. The pressure relief mechanism 23 can ensure that the thermal runaway flue gas in the single battery 11 in the pressure-containing shell 2 is discharged from the pressure-containing shell 2 in an orderly manner.

[0096] The battery module with the above structure is assembled as follows: firstly, the plurality of single batteries 11 are arranged in the same direction in the box 21, the connecting pipe assembly connects the channels 112 on the polarity terminals 111 of the adjacent single batteries 11 to form the heat exchange channel; secondly, the electrical connection between the single batteries 11 is realized by the electrical connection assembly 3, and meanwhile, the adapter pipe 4 and the second electrical connection 32 are insulated and sealingly connected with the box 21; and finally, the top plate 22 is sealingly connected with the box 21.

[0097] Embodiment 2

[0098] The battery module in this embodiment has a structure similar to that in Embodiment 1, and the heat exchange device in this embodiment is different from that in Embodiment 1. The heat exchange device and the heat exchange channel 112 in this embodiment are realized by the following structure:

[0099] As shown in Figure 11 and Figure 13 , the heat exchange device in this embodiment includes a plurality of sub heat exchange devices, each of which is arranged at the top of each single battery 11; the polarity terminal 111 of each single battery 11 is electrically connected with the electrical connection assembly 3 after penetrating the sub heat exchange device at the top of each single battery 11 in the z direction, and part of the structure of the polarity terminal 111 of the single battery 11 is located in the heat exchange device and directly contacts the insulating heat exchange medium; the sub heat exchange devices of the adjacent single batteries 11 are connected with each other to form the heat exchange channel 112, and the sub heat exchange devices are insulated from the polarity terminals of each single battery 11 and the part of the shell of each single battery 11 that contacts the sub heat exchange devices.

[0100] The sub heat exchange device in this embodiment is described in detail below with reference to the accompanying drawings.

[0101] a. As shown in Figure 12 and Figure 16 , the sub heat exchange device includes two heat exchange pipe assemblies 13 arranged in the y direction, each of which is provided with a first channel 15 and a second channel 16; the first channel 15 penetrates in the x direction; the second channel 16 penetrates in the z direction and is connected with the first channel 15; the two polarity terminals 111 of each single battery 11 pass through the second channels 16 of the two heat exchange pipe assemblies 13 respectively and are electrically connected with the electrical connection assembly 3, and meanwhile, the two ports of the second channel 16 are sealingly connected with the polarity terminals 111.

[0102] b. As shown in Figure 14 and Figure 17As shown in the drawings, the sub heat exchange device comprises one heat exchange pipe 13, each heat exchange pipe 13 is provided with a first channel 15 and two second channels 16 arranged along the y direction; the first channel 15 is through along the x direction; the second channel 16 is through along the z direction and is communicated with the first channel 15; two polar terminals 111 of each single battery 11 are correspondingly passed through the two second channels 16 on the heat exchange pipe 13 and are electrically connected with the electrical connection assembly 3, and meanwhile, the two ports of the second channel 16 are sealed with the polar terminal 111.

[0103] c. As shown in the drawings, Figure 18 and Figure 19 As shown in the drawings, the sub heat exchange device comprises two heat exchange pipes 13 arranged along the y direction, the heat exchange pipe 13 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 upper cover plate of the single battery 11, each heat exchange pipe 13 is provided with a first channel 15 and one second channel 16; the first channel 15 is through along the x direction; the second channel 16 is through along the z direction and is communicated with the first channel 15; two polar terminals 111 of each single battery 11 are correspondingly passed through the second channels 16 on the two heat exchange pipes 13 and are electrically connected with the electrical connection assembly 3, and meanwhile, one port of the second channel 16 is sealed with the polar terminal 111.

[0104] d. As shown in the drawings, Figure 20 As shown in the drawings, the sub heat exchange device comprises one heat exchange pipe 13, each heat exchange pipe 13 is provided with a first channel 15 and two second channels 16 arranged along the y direction; the first channel 15 is through along the x direction; the second channel 16 is through along the z direction and is communicated with the first channel 15; two polar terminals 111 of each single battery 11 are correspondingly passed through the two second channels 16 on the heat exchange pipe 13 and are electrically connected with the electrical connection assembly 3, and meanwhile, one port of the second channel 16 is sealed with the polar terminal 111.

[0105] When the battery pack 1 is installed, the heat exchange pipes 13 of the adjacent single batteries 11 are communicated with each other to form a heat exchange channel 112, thereby realizing heat exchange with each single battery 11. The cross-sectional shape of the heat exchange pipe 13 is not limited in the utility model, since the heat exchange pipe 13 in the embodiment is arranged on the top of the single battery 11 in a planar shape, considering the structural regularity, the heat exchange pipe 13 in the embodiment is a rectangular pipe or a rectangular half pipe. In other embodiments, a circular pipe or a pipe with other structural forms can also be used.

[0106] The first channel 15 is a channel 112 extending along the length of the heat exchange tube 13. The ends of the first channel 15 serve as the inlet and outlet of the heat exchange tube 13, respectively. Sealing plates may be fixed to the ends of the first channel 15, with openings formed in the sealing plates serving as the inlet and outlet of the heat exchange plate 14.

[0107] The aforementioned second channel 16 allows for a portion of the polarity terminal 111 to pass through. In this embodiment, the second channel 16 is perpendicular to the first channel 15. Furthermore, in the z-direction (the height of the battery cell 11), the second channel 16 is smaller than the corresponding polarity terminal 111, ensuring that the top of the polarity terminal 111 protrudes from the second channel 16 as an electrical connection.

[0108] In this embodiment, the port shape of the second channel 16 is adapted to the cross-sectional shape of the polarity terminal 111. The port shape of the second channel 16 is circular, the cross-sectional shape of the polarity terminal 111 is also circular, and the diameter of the two ports of the second channel 16 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 16 and the cross-sectional shape of the polarity terminal 111 can be different, as long as it is ensured that the polarity terminal 111 can be inserted into the second channel 16 and can be sealed.

[0109] like Figure 15 As shown, when constructing a battery module, the heat exchange pipes 13 of the single cells 11 on the same side can be connected to form two heat exchange channels 112 at the top of the battery pack 1. The two heat exchange channels 112 can be connected in parallel or in series, and heat exchange of the battery pack 1 is achieved based on the two heat exchange channels 112. When connecting, a connecting pipe section 131 can be connected to the inlet or outlet of the heat exchange pipe 13. Taking the inlet as an example, the connecting pipe section 131 of one heat exchange pipe 13 can be inserted into the outlet of another heat exchange pipe 13 to achieve communication between two adjacent heat exchange pipes 13. The connection between the connecting pipe section 131 and the other heat exchange pipe 13 needs to be sealed. A connecting pipe section 131 can also be provided at the liquid inlet and liquid outlet of each heat exchange pipe 13. In two adjacent heat exchange pipes 13, the connecting pipe section 131 of one heat exchange pipe 13 and the connecting pipe section 131 of the other heat exchange pipe 13 are sealed and plugged into each other.

[0110] In addition, if Figure 16 and Figure 17As shown, since the heat exchange pipe 13 flows with the insulating heat exchange medium, the sealing of the heat exchange pipe 13 is particularly important. In order to ensure the sealing of the heat exchange pipe 13, two annular grooves extending along the circumferential direction of the polar terminal 111 are formed on the polar terminal 111, the two annular grooves are arranged along the z direction, and the O-shaped sealing ring 17 is embedded in the two annular grooves. The two O-shaped sealing rings 17 are pressed against the two ports of the second channel 16, so as to realize sealing and improve the stability of the heat exchange pipe 13.

[0111] In other embodiments, when the heat exchange pipe 13 is made of metal, the sealing of the polar terminal 111 and the top port of the second channel 16 can be realized by welding (the top port mentioned here is the port close to the electrical connection part of the polar terminal 111, and the welding method can further improve the stability of the heat exchange pipe 13 on the polar terminal 111); an insulating pad is additionally arranged between the heat exchange pipe 13 and the top of the single battery 11 to realize the insulation between the heat exchange pipe 13 and the top of the single battery 11.

[0112] In order to facilitate the connection with the external pipeline, the adapter pipe 4 is connected to the free end of the channel 112 of the polar terminal 111 which is the liquid inlet end and the liquid outlet end. The adapter pipe 4 is connected with the external pipeline through the adapter pipe 4. When the adapter pipe 4 is installed, it is connected with the external pipeline through the pressure-bearing shell 2. In order to further ensure the pressure-bearing performance of the pressure-bearing shell 2, the adapter pipe 4 is integrally formed on the pressure-bearing shell 2, for example, the adapter pipe 4 can be welded on the pressure-bearing shell 2. At the same time, the non-connected part of the adapter pipe 4 is preferably flexible. Based on the deformation of the adapter pipe 4, the adapter pipe 4 can be connected with the pressure-bearing shell 2 and the polar terminal 111 respectively, and the adapter pipe 4 can be sealed and connected with the port of the corresponding channel 112.

[0113] It should be noted that:

[0114] The heat exchange pipe 13 may cause short circuit after contacting with the top of the single battery 11 or the polar terminal 111. At this time, insulation between the heat exchange pipe 13 and the top of the single battery 11 or the polar terminal 111 needs to be realized. The following methods can be used to realize the insulation:

[0115] 2.1, selecting the heat exchange pipe 13 made of insulating material;

[0116] 2.2, selecting the connecting pipe section 131 made of insulating material;

[0117] 2.3, the heat exchange pipe 13 is made of non-insulating material, the wall of the heat exchange pipe 13 can be insulated, for example, by spraying insulating paint, wrapping insulating film, etc., to overcome this problem; an insulating sealing gasket can also be added between the heat exchange pipe 13 and the polarity terminal 111 and the top of the single battery 11 to overcome this problem; of course, to be on the safe side, multiple insulation methods can be combined to overcome this problem;

[0118] As shown in Figure 16 In order to further improve the stability of the heat exchange pipe 13 on the single battery 11, the embodiment can add an L-shaped connecting rib 5 between the heat exchange pipe 13 and the single battery 11 box 21. The horizontal plate of the L-shaped connecting rib 5 is fixedly connected with the heat exchange pipe 13, and the vertical plate of the L-shaped connecting rib 5 is fixedly connected with the single battery 11 box 21. The specific connection method can be selected according to the material of the heat exchange pipe 13. For example, the heat exchange pipe 13 in the embodiment is made of insulating material, so the L-shaped connecting rib 5 can be fixedly connected with the heat exchange pipe 13 and the single battery 11 box 21 by screws. When the heat exchange pipe 13 is made of metal material, the L-shaped connecting rib 5 can be fixedly connected with the heat exchange pipe 13 and the single battery 11 box 21 by welding.

[0119] In addition, if two second channels 16 are provided on the heat exchange pipe 13 and heat exchange with two polarity terminals 111 of the same single battery 11, the projection of the heat exchange pipe 13 will basically cover the upper cover plate of the single battery 11 after being arranged on the top of the single battery 11. If the explosion vent 19 (the explosion vent 19 can also be called an explosion vent, an explosion-proof part, an explosion-proof opening, etc.) is arranged on the upper cover plate of the single battery 11, and the gap between the heat exchange pipe 13 and the upper cover plate is too small or even does not exist, the heat runaway smoke may not be able to be timely discharged under the shielding of the heat exchange pipe 13, which has certain safety hazards. In the embodiment, the following two schemes can be used to solve such problems:

[0120] Scheme one, adjust the position of the explosion vent 19 to avoid the heat exchange pipe 13, for example, the explosion vent 19 can be arranged on the lower cover plate.

[0121] Scheme two, as shown in Figure 21 Another avoiding channel 112 perpendicular to the first channel 15 is arranged on the heat exchange pipe 13; the avoiding channel 112 corresponds to the explosion vent 19 of the upper cover plate; an explosion vent branch pipe 18 is arranged on the upper cover plate, one end of the explosion vent branch pipe 18 is sealingly connected with the upper cover plate region around the explosion vent 19, and the other end penetrates through the avoiding channel 112 and extends out.

[0122] Similarly, if the liquid injection port is located below the heat exchange pipe 13, it is not convenient to inject liquid, therefore, the liquid injection port should also be arranged away from the heat exchange pipe 13, and can be arranged at the edge position of the upper cover plate.

[0123] Embodiment 3

[0124] The battery module in this embodiment is similar to the battery module in Embodiment 1, and the structure of the heat exchange device in this embodiment is different from that in Embodiment 1. The heat exchange device and the heat exchange channel 112 in this embodiment are realized by the following structure:

[0125] As shown in Figure 22 and Figure 24 , the heat exchange device in this embodiment includes at least one heat exchange plate, the polarity terminals 111 of each monomer battery 11 are all penetrated through the heat exchange plate in the z direction and then electrically connected with the electrical connection assembly 3, part of the structure of the polarity terminals 111 of each monomer battery 11 is located in the heat exchange plate and directly contacts with the insulating heat exchange medium, and the side wall of the polarity terminal 111 of each monomer battery 11 is sealed with the heat exchange device, the heat exchange device is insulated with the adjacent monomer battery 11, and the insulation here specifically refers to the insulation between the heat exchange device and the part of the monomer battery 11 that contacts with the polarity terminal and the shell of the monomer battery.

[0126] The specific structure of the heat exchange device will be described in detail below in combination with the drawings and specific embodiments.

[0127] a、As shown in Figure 23 , the heat exchange device includes two heat exchange plates 14 arranged along the y direction, and each heat exchange plate 14 corresponds to the polarity terminals 111 of all monomer batteries 11 located on the same side in the battery pack 1;

[0128] Each heat exchange plate 14 is provided with a first channel 15 and a group of second channels 16 arranged along the x direction, and the number of the second channels 16 is consistent with the number of the monomer batteries 11; the first channel 15 penetrates along the x direction and serves as a heat exchange channel; the second channels 16 penetrate along the z direction and are connected with the first channel 15; the polarity terminals 111 of all monomer batteries 11 located on one side respectively penetrate through the second channels 16 on one heat exchange plate 14 and then are electrically connected with the electrical connection assembly 3, and the polarity terminals 111 of all monomer batteries 11 located on the other side respectively penetrate through the second channels 16 on the other heat exchange plate 14 and then are electrically connected with the electrical connection assembly 3, and meanwhile, the two ports of each second channel 16 are sealed with the polarity terminal 111;

[0129] The two heat exchange plates 14 are respectively sleeved on the polarity terminals 111 on different sides of the battery pack 1, and the two heat exchange plates 14 can be connected in series, and in some other embodiments, the two heat exchange plates 14 can also be connected in parallel;

[0130] b、As shown in Figure 25As shown, the heat exchange device comprises a heat exchange plate 14, which is provided with a first channel 15 and two groups of second channels 16 arranged along the x direction; the first channel 15 penetrates along the x direction and serves as a heat exchange channel; the number of the second channels 16 is twice the number of the single batteries 11, each second channel 16 is connected to the first channel 15 along the z direction, and the two ports of the second channel 16 are sealed with the polar terminals 111.

[0131] The cross-sectional shape of the heat exchange plate 14 is not specifically limited in the utility model, and since the heat exchange plate 14 in the embodiment is arranged on the top of the battery pack 1 in a planar manner, the heat exchange plate 14 in the embodiment is a rectangular plate in consideration of structural regularity. In some other embodiments, a pipe with other structural forms can also be used.

[0132] The first channel 15 is a channel 112 provided in the length direction of the heat exchange plate 14, and in the utility model, after the heat exchange plate 14 is fixed on the top of the battery pack 1, the length direction of the heat exchange plate 14 is consistent with the arrangement direction of the single batteries 11 (the arrangement direction of the single batteries 11 is the x direction), so it can be considered that the first channel 15 extends along the x direction, and the two end ports of the first channel 15 serve as the liquid inlet and outlet of the heat exchange plate 14.

[0133] The second channel 16 is a channel 112 penetrating the side wall of the heat exchange plate 14 and connected to the first channel 15, and in the utility model, after the heat exchange plate 14 is fixed on the top of the battery pack 1, the extension direction of the second channel 16 is consistent with the height direction of the single batteries 11.

[0134] In addition, each group of second channels 16 needs to correspond to the polar terminals 111 of the multiple single batteries 11 on the same side one by one; in addition, in the z direction (the height direction of the single batteries 11), the size of the second channel 16 is smaller than the size of the corresponding polar terminal 111, so as to ensure that the top of the polar terminal 111 as the electrical connection part extends out of the second channel 16.

[0135] The port shape of the second channel 16 in the embodiment is adapted to the cross-sectional shape of the polar terminal 111, the shape of the port of the second channel 16 is circular, the cross section of the polar terminal 111 is also circular, and the diameter of the two ports of the second channel 16 is slightly larger than the outer diameter of the polar terminal 111; in some other embodiments, the shape of the two ports of the second channel 16 can be different from the cross-sectional shape of the polar terminal 111, as long as the polar terminal 111 can be inserted into the second channel 16 and the sealing can be realized.

[0136] In addition, as shown in FIG. 2, the heat exchange plate 14 is provided with a plurality of second channels 16 arranged along the x direction, and the two groups of second channels 16 are arranged on the same side of the heat exchange plate 14. Figure 26As the heat exchange plate 14 is filled with the heat exchange medium, the sealing of the heat exchange plate 14 is particularly important. In order to ensure the sealing of the heat exchange plate 14, two annular grooves extending along the circumferential direction of the polar terminal 111 are formed on the polar terminal 111, and the two annular grooves are arranged along the z direction. An O-shaped sealing ring 17 is embedded in the two annular grooves, and the two O-shaped sealing rings 17 are pressed against the two ports of the second channel 16, thereby achieving sealing and improving the stability of the heat exchange plate 14.

[0137] After the heat exchange device is installed on the top of the battery pack 1, the two ports of the heat exchange device serve as the liquid inlet and outlet, respectively. In order to facilitate the connection with the external pipeline, an adapter pipe 4 is connected to the liquid inlet and outlet in the embodiment. The adapter pipe 4 is connected to the external pipeline by penetrating the pressure shell 2. In order to further ensure the pressure bearing performance of the pressure shell 2, the adapter pipe 4 is integrally formed on the pressure shell 2, i.e., the adapter pipe 4 is welded on the pressure shell 2.

[0138] It should be noted that the heat exchange plate 14 is in contact with the polar terminal 111 of the plurality of single batteries 11 for polar heat exchange. In order to avoid short circuit, the following methods can be used to achieve insulation between the heat exchange plate 14 and the polar terminal 111:

[0139] 3.1, selecting an insulating material for the heat exchange plate 14, which can achieve insulation between the heat exchange plate 14 and the polar terminal 111, and also achieve insulation between the heat exchange plate 14 and the top of the battery pack 1;

[0140] 3.2, using a heat exchange plate 14 made of non-insulating material, and adding an insulating member ring between the polar terminal 111 and the heat exchange plate 14; insulating the side wall of the heat exchange plate 14, such as spraying insulating paint, wrapping insulating film, etc. In order to be safe, multiple insulation methods can be combined to overcome the problem.

[0141] The heat exchange plate 14 made of insulating material is used to achieve insulation between the heat exchange plate 14 and the top of the battery pack 1 and the polar terminal 111.

[0142] In order to further improve the stability of the heat exchange plate 14 on the battery pack 1, the present embodiment can additionally provide an L-shaped connecting rib between the heat exchange plate 14 and the box 21 of at least one single battery 11 constituting the battery pack 1, the transverse plate of the L-shaped connecting rib is fixedly connected with the heat exchange plate 14, and the vertical plate of the L-shaped connecting rib is fixedly connected with the box 21 of the single battery 11. The specific connection mode can be selected according to the material of the heat exchange plate 14. For example, the heat exchange plate 14 of the present embodiment is made of insulating material, so the L-shaped connecting rib can be fixedly connected with the heat exchange plate 14 and the box 21 of the single battery 11 by screws. When the heat exchange plate 14 is made of metal material, the L-shaped connecting rib can be fixedly connected with the heat exchange plate 14 and the box 21 of the single battery 11 by welding.

Claims

1. A battery module, characterized by, The battery pack and the pressure shell are included; The pressure shell is a closed pressure shell; The battery pack includes a plurality of single batteries arranged in the x direction in the pressure shell and connected in series by an electrical connection assembly; The pressure shell is provided with a heat exchange device arranged on the top of each single battery, and the heat exchange device is insulated from each single battery; the heat exchange device has a heat exchange channel through which an insulating heat exchange medium is passed, and the insulating heat exchange medium in the heat exchange channel directly contacts the polar terminals of each single battery for heat exchange.

2. The battery module of claim 1, wherein, The pressure shell includes a box with an open top and a top plate sealingly arranged at the open top end of the box.

3. The battery module of claim 2, wherein, The electrical connection assembly includes first and second electrical connectors, and the polar terminals of adjacent single batteries of different polarities are electrically connected by the first electrical connectors; two second electrical connectors are respectively electrically connected to the polar terminals of different polarities of the single batteries at both ends of the battery pack; two electrical connection terminals are fixedly arranged on the pressure shell, and the two second electrical connectors are respectively and correspondingly electrically connected to the two electrical connection terminals.

4. The battery module of claim 1, wherein, The heat exchange channel is connected to an external pipeline through an adapter pipe which is integrally fixed on the pressure shell.

5. The battery module according to any one of claims 1 to 4, characterized in that, The heat exchange device includes a connecting pipe assembly, each single battery has a channel passing through the polar terminal, and the connecting pipe assembly connects the channels on the polar terminals of adjacent single batteries to form a heat exchange channel, and the connecting pipe assembly is insulated from the polar terminals of each single battery.

6. The battery module of claim 5, wherein, Both ends of the channel are provided with fixed parts fixed to the side walls of the polar terminals and connected to the connecting pipe assembly; the inner wall of the channel is provided with heat-conducting rib plates for increasing the heat exchange area.

7. The battery module according to any one of claims 1 to 4, characterized in that, The heat exchange device includes a plurality of sub-heat exchange devices, each sub-heat exchange device is arranged on the top of each single battery, and each sub-heat exchange device includes at least one heat exchange pipe, each heat exchange pipe has a first channel extending in the x direction and at least one second channel; The polar terminals of each single battery are respectively electrically connected to the electrical connection assembly after penetrating through each sub-heat exchange device in the z direction, the first channels of the sub-heat exchange devices of adjacent single batteries are connected to form a heat exchange channel, and part of the structure of the polar terminals of each single battery is located in the heat exchange channel and directly contacts the insulating heat exchange medium.

8. The battery module of claim 7, wherein, The sub-heat exchange device includes two heat exchange pipes arranged in the y direction, each heat exchange pipe has a first channel and a second channel; the first channel passes through in the x direction; the second channel passes through in the z direction and is connected to the first channel; The two polar terminals of the single battery are respectively electrically connected to the electrical connection assembly after penetrating through the second channels of the two heat exchange pipes, and the two ports of the second channel are sealed from the polar terminals.

9. The battery module of any one of claims 1 to 4, wherein, The heat exchange device includes at least one heat exchange plate, the heat exchange plate has a first channel extending in the x direction and at least one group of second channels arranged in the x direction, the first channel in the heat exchange plate serves as a heat exchange channel, and each second channel passes through in the z direction and is connected to the first channel; The polar terminals of each single battery are respectively electrically connected to the electrical connection assembly after penetrating through the second channels in the z direction, and part of the structure of the polar terminals of each single battery is located in the heat exchange channel and directly contacts the insulating heat exchange medium.

10. The battery module of claim 9, wherein, The heat exchange device comprises two heat exchange plates arranged along a y direction; each heat exchange plate is provided with a first channel and a plurality of second channels arranged along an x direction; the first channel penetrates along the x direction; each second channel penetrates along a z direction and is communicated with the first channel; Each heat exchange plate corresponds to the polarity terminals of all monomer batteries located on the same side in the battery pack; each polarity terminal is electrically connected with the electrical connection assembly after penetrating through the second channel on the heat exchange plate, and the two ports of the second channel and the polarity terminals are sealed.

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