Battery module, battery pack and electric device

Abstract

The utility model relates to the related technical field of batteries, and provides a battery module, a battery pack and a power utilization device. The battery module comprises a plurality of battery monomers, the plurality of battery monomers are transversely arranged and arranged in two rows, a pair of narrow side surfaces of each battery monomer are arranged up and down, and the bottom walls of the two rows of battery monomers are oppositely arranged so that cover plates, provided with anti-explosion valves, of the corresponding battery monomers are oppositely arranged; and the liquid cooling plate is in heat conduction connection with the narrow side surface of the upper side and / or the lower side of the corresponding battery monomer and is used for controlling the temperature of the corresponding battery monomer. The arrangement mode of the battery monomers in the battery module is optimized, the battery monomers are transversely arranged, and meanwhile, the bottom liquid cooling plate is arranged at the joint of the narrow side surfaces of the battery monomers, so that the contact surface of the battery and the bottom liquid cooling plate is enlarged, and the heat dissipation efficiency is improved; battery explosion-proof valves face two sides of the module, so that risks such as battery fire and explosion are reduced, and the safety is improved; the narrow side surface in the height direction of the battery is contacted with the liquid cooling plate to reduce the battery temperature difference and prolong the service life of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module, a battery pack and an electric device. Background Art

[0002] In related technologies, with the release of the national dual-carbon strategy, the development of the power and energy storage industries has been accelerated, and lithium battery vehicles and lithium battery energy storage have ushered in great opportunities for development; battery pack and battery module packaging technology is a key technology in the field of lithium batteries. Since batteries generate a lot of heat during the charging and discharging process, in order to reduce the heat of the battery pack and prevent thermal runaway, the current mainstream solution is to install a liquid cooling plate on the battery to reduce the temperature of the battery.

[0003] The current liquid cooling plate heat dissipation solution usually uses a combination of end plates and steel strips to ensure that the module's external dimensions are not affected. The battery output pole side faces upward, the explosion-proof valve faces upward, and the corresponding other side contacts the liquid cooling tray. The module is assembled into the liquid cooling tray to form a PACK (battery pack). However, this liquid cooling solution also has some problems, such as: the contact area between the module and the liquid cooling plate is small, and the heat dissipation effect is poor; the battery explosion-proof valve faces upward, and when the battery valve is opened, the liquid splashes onto the surface of other cells, affecting battery safety and easily causing accidents such as fire and explosion; the battery output pole side is far away from the contact side of the liquid cooling plate, resulting in a large temperature difference between the upper and lower sides of the battery, affecting the battery life, etc. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery module, a battery pack and an electrical device to solve the technical problems in the prior art that the heat exchange effect of the battery module is poor and it is easy to catch fire after its explosion-proof valve is opened.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a battery module, the battery module comprising:

[0007] A plurality of battery cells, wherein the plurality of battery cells are disposed horizontally and arranged in two rows, wherein a pair of narrow side surfaces of each of the battery cells are disposed up and down, and the bottom walls of the two rows of battery cells are disposed oppositely so that the cover plates of the corresponding battery cells provided with the explosion-proof valves are disposed oppositely;

[0008] The liquid cooling plate is thermally connected to the narrow side surfaces on the upper side and / or the lower side of the corresponding battery cell, and is used to control the temperature of the corresponding battery cell.

[0009] According to some embodiments of the present application, the liquid cooling plate includes:

[0010] a top liquid cooling plate, disposed above the corresponding battery cell to be thermally connected to the narrow side surface of the upper side of the battery cell; and / or,

[0011] A bottom liquid cooling plate is disposed below the corresponding battery cell to be thermally connected to the narrow side surface of the lower side of the battery cell

[0012] According to some embodiments of the present application, the battery module further includes:

[0013] The end plate assembly comprises: two side end plates and a middle end plate, wherein the two side end plates are respectively arranged at the two ends of the two columns of battery cells, and the middle end plate is arranged in the middle of the two columns of battery cells;

[0014] The module fixing bar is connected to the bottom liquid cooling plate through a first connecting member; wherein one end of the first connecting member is connected to the module fixing bar, and the other end is passed through the end plate assembly and fixedly connected to the bottom liquid cooling plate to fix the multiple battery cells.

[0015] According to some embodiments of the present application, the module fixing bar includes:

[0016] Two side fixing bars, the two side fixing bars are respectively extended along the arrangement direction of the battery cells in the corresponding columns and are arranged on the top side of the battery module;

[0017] The middle fixing bar extends along the arrangement direction of the battery cells in any column and is arranged at the opposite positions of the bottom walls of the two columns of battery cells.

[0018] According to some embodiments of the present application, the middle fixing bar is provided with a plurality of pressing sheets for pressing the battery cells.

[0019] The plurality of pressing sheets are arranged on both sides of the middle fixing bar and correspond one by one to the plurality of battery cells.

[0020] According to some embodiments of the present application, an insulating sheet is attached to the surface of the middle end plate corresponding to the battery cells on both sides thereof.

[0021] According to some embodiments of the present application, the battery module further includes:

[0022] The limiting strip is arranged on the upper surface of the bottom liquid cooling plate and is used for limiting the positions of the two rows of battery cells.

[0023] According to some embodiments of the present application, a heat exchange partition is provided between the two rows of battery cells, and a heat exchange channel is provided inside the heat exchange partition for controlling the temperature of the corresponding battery cells.

[0024] According to some embodiments of the present application, the two columns of battery cells are connected in series, and the battery cells in each column of battery cells are connected in series in sequence.

[0025] The total positive and total negative of the battery module are located at the same end of the battery module, the total positive is led to the end of one of the two columns of battery cells, and the total negative is led to the end of the other of the two columns of battery cells.

[0026] In a second aspect, the present application provides a battery pack, which includes any battery module described in the above embodiments.

[0027] In a third aspect, the present application provides an electrical device, which includes any battery module described in the above embodiments.

[0028] In the above technical scheme, a battery module and an electrical device are provided. By optimizing the arrangement of battery cells in the battery module, the battery cells are placed horizontally, and at the same time, a bottom liquid cooling plate is configured to connect with the narrow side of the battery cell, thereby increasing the contact surface between the battery and the bottom liquid cooling plate and improving the heat dissipation efficiency; the battery explosion-proof valve is directed toward both sides of the module, and when the battery valve is opened, the electrolyte will not be sprayed onto the battery surface, reducing the risk of battery fire and explosion, thereby improving safety; at least one narrow side in the battery height direction (vertical direction after the battery cell is placed horizontally) is in contact with the liquid cooling plate, and the thickness of the narrow side is narrow, which effectively reduces the heat transfer distance, reduces the battery temperature difference, and improves the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is an overall schematic diagram of a battery module according to an exemplary embodiment;

[0031] Figure 2 is a schematic diagram of a battery cell according to an exemplary embodiment;

[0032] Figure 3 is a front view of a battery module according to an exemplary embodiment;

[0033] Figure 4 is a left side view of a battery module according to an exemplary embodiment;

[0034] Figure 5The figure is a schematic diagram of a battery module assembly limit strip according to an exemplary embodiment.

[0035] In the figure: 10, battery cell; 101, cover plate; 102, explosion-proof valve; 103, narrow side; 104, bottom wall; 105, large surface; 20, end plate assembly; 201, side end plate; 202, middle end plate; 30, module fixing bar; 301, side fixing bar; 302, middle fixing bar; 40, bottom liquid cooling plate; 50, CCS assembly; 601, total positive; 602, total negative; 70, copper busbar mounting base; 701, connecting copper busbar. DETAILED DESCRIPTION

[0036] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0037] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0038] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0039] In the related technology, the bottom wall or cover of the battery cell in the traditional module contacts the liquid cooling plate for heat exchange and cooling, and the battery cell is arranged upright (that is, the cover with the explosion-proof valve faces upward). Therefore, there are some problems with the current liquid cooling solution, such as: the contact area between the module and the liquid cooling plate is small, and the heat dissipation efficiency is not high; the battery explosion-proof valve faces upward, and when the battery valve is opened, the liquid splashes onto the surface of other battery cells, affecting battery safety and easily causing accidents such as fire and explosion; the battery pole side is far away from the contact side of the liquid cooling plate, resulting in a large temperature difference between the upper and lower sides of the battery, affecting the battery life, etc.

[0040] The present application provides a battery module and an electrical device, which optimizes the arrangement of its battery cells and adjusts them into two rows of horizontally placed battery cells. At the same time, a bottom liquid cooling plate is configured to connect the narrow side surfaces of the horizontally placed battery cells, thereby increasing the contact surface between the battery and the bottom liquid cooling plate and improving the heat dissipation efficiency. The battery explosion-proof valve is directed toward both sides of the module. When the battery valve is opened, the electrolyte will not spray onto the battery surface, thereby reducing the risk of battery fire and explosion and improving safety. The narrow side surface of the battery in the height direction is used to contact the bottom liquid cooling plate, thereby reducing the heat transfer distance, reducing the battery temperature difference and improving the battery life.

[0041] The technical solution of this embodiment is described in detail below in conjunction with the accompanying drawings. The following embodiments and implementation methods can be combined with each other if there is no conflict.

[0042] In an exemplary embodiment of the present utility model, a battery module is provided, such as Figure 1-Figure 2 As shown, Figure 1 is an overall schematic diagram of a battery module according to an exemplary embodiment. Figure 2 is a schematic diagram of a battery cell according to an exemplary embodiment. The battery module includes:

[0043] The bottom liquid cooling plate 40 is located at the bottom of the battery module and can carry the battery cells 10 and perform heat exchange and cooling on them;

[0044] A plurality of battery cells 10 are horizontally placed on a bottom liquid cooling plate 40 and arranged in two rows, wherein the bottom walls 104 of the two rows of battery cells 10 are arranged opposite to each other, and the cover plates 101 of the two rows of battery cells 10 with explosion-proof valves 102 are arranged back to back, and the narrow side surface 103 of each battery cell 10 is thermally connected to the bottom liquid cooling plate 40 on its lower side.

[0045] In this exemplary embodiment, since multiple battery cells 10 are placed horizontally and the bottom wall 104 is opposite, the cover plate 101 with the explosion-proof valve 102 can be oriented toward both sides of the battery module. When the battery valve is opened, the electrolyte will not spray onto the battery surface, reducing the risk of battery fire and explosion, thereby improving safety. The battery module uses a bottom liquid cooling plate 40 to exchange heat and cool down the battery cells 10 below the two rows. The battery module contains square battery cells 10, and the area of ​​the narrow side surface 103 of the square battery cell 10 is also larger than the area of ​​its bottom wall 104, thereby increasing the contact surface between the battery and the bottom liquid cooling plate 40 and improving the heat dissipation efficiency. In addition, the explosion-proof valves 102 of each battery cell 10 of the battery module are all oriented toward both sides of the battery module, and the narrow side surface 103 in the height direction of the battery cell 10 is used to contact the bottom liquid cooling plate 40, which can also reduce the heat transfer distance, reduce the battery temperature difference, and improve the battery life.

[0046] It should be noted that in addition to the "bottom liquid cooling plate 40 controls the temperature of the battery cell 10 at the bottom" method in this embodiment, a top liquid cooling plate can also be provided to control the temperature of the battery cell 10 above it. Since each battery cell 10 is in a horizontal position, the top liquid cooling plate is also in contact with another narrow side surface 103 in the height direction of the battery cell 10 (in the vertical direction after the battery cell 10 is placed horizontally). Heat exchange and cooling are performed on the upper and lower sides of the two columns of battery cells 10 at the same time, which can further improve the heat dissipation efficiency of the battery module. In addition, only a top liquid cooling plate can be provided, that is, the bottom liquid cooling plate 40 is not provided, and only the narrow side surface on the upper side of the battery cell 10 is thermally connected to perform heat exchange and temperature control on the corresponding narrow side surface.

[0047] In some exemplary embodiments, Figure 1-Figure 4As shown, in this exemplary embodiment, the battery module also includes: an end plate assembly 20 and a module fixing bar 30. The end plate assembly 20 includes: two side end plates 201 and a middle end plate 202, the two side end plates 201 are correspondingly arranged at the two ends of the two columns of battery cells 10, and the middle end plate 202 is arranged in the middle of the two columns of battery cells 10. The module fixing bar 30 is connected to the bottom liquid cooling plate 40 through a first connecting member; wherein one end of the first connecting member is connected to the module fixing bar 30, and the other end is passed through the end plate assembly 20 (at the corresponding position, the side end plates 201 and the middle end plates 202 are respectively passed through the first connecting member) and then fixedly connected to the bottom liquid cooling plate 40 to fix multiple battery cells 10. Exemplarily, the first connecting member is a long bolt or the like.

[0048] It should be noted that the number of intermediate end plates 202 can also be determined according to the total length of the battery module. If the number of battery cells 10 is large, after the battery module is divided into two columns, its overall length is still large. In this case, multiple intermediate end plates 202 can be provided.

[0049] After the battery cells 10 are arranged on the bottom liquid cooling plate 40 in a corresponding order, the module fixing bar 30 , the end plate assembly 20 and the bottom liquid cooling plate 40 cooperate to fix the battery cells 10 , thereby enhancing the stability of the overall structure of the battery module.

[0050] In addition, if a top liquid cooling plate is used, the top liquid cooling plate can be connected to the module fixing bar 30 so that the top liquid cooling plate is in contact with the upward facing narrow side 103 of the battery cell 10 for heat exchange and cooling; the module fixing bar 30 can also be replaced by the top liquid cooling plate, that is, the top liquid cooling plate, the bottom liquid cooling plate 40 and the end plate assembly 20 are matched, and the battery cell 10 is fixed using corresponding connectors.

[0051] In some exemplary embodiments, Figure 1-Figure 4 As shown, in this exemplary embodiment, the module fixing bar 30 includes: two side fixing bars 301 and a middle fixing bar 302. The two side fixing bars 301 are respectively extended along the arrangement direction of the battery cells 10 in the corresponding columns and are arranged on the top side of the battery module. The two side fixing bars 301 cooperate with the end plate assembly 20 and the bottom liquid cooling plate 40 to form a compression limit for the two columns of battery cells 10 near their cover plates 101. The middle fixing bar 302 extends along the arrangement direction of any column of battery cells 10 and is arranged at the position opposite to the bottom wall 104 of the two columns of battery cells 10. The middle fixing bar 302 cooperates with the end plate assembly 20 and the bottom liquid cooling plate 40 to form a compression limit for the two columns of battery cells 10 near their bottom wall 104.

[0052] Considering the overall structural strength of the battery module, in this embodiment, the lengths of the middle fixing bar 302 and the side fixing bar 301 are determined according to the design length of the battery module. In addition, after the strength of the corresponding fixing bar is enhanced, the middle fixing bar 302 or the side fixing bar 301 can be fixed in sections. For example, the two side fixing bars 301 still use the full-length size, and the middle fixing bar 302 adopts a multi-section design. At this time, the multi-section middle fixing bars 302 also need to be laid and fixed along the arrangement direction of the battery cells 10 in the corresponding column. It can be understood that the number of multi-section middle fixing bars 302 can be reasonably selected according to the number of the set middle end plates 202.

[0053] In some exemplary embodiments, Figure 1-Figure 4 As shown, in this exemplary embodiment, a plurality of pressing sheets are provided on the middle fixing bar 302 for pressing the battery cells 10. The plurality of pressing sheets are provided on both sides of the middle fixing bar 302 and correspond to the plurality of battery cells 10 one by one. After the middle fixing bar 302 is connected to the bottom liquid cooling plate 40 through the first connecting member, the pressing sheets are used to press the corresponding battery cells 10 to form a certain pressing force, thereby ensuring the stability of the two rows of battery cells 10.

[0054] In some exemplary embodiments, in order to enhance the heat exchange effect of the battery cells 10, a heat exchange partition is provided between two rows of battery cells 10, and a heat exchange flow channel is provided inside the heat exchange partition for controlling the temperature of the bottom wall 104 of the corresponding battery cell 10. When the heat exchange partition is assembled between the two rows of battery cells 10, it can be pressed together with the battery cell 10 by using the middle fixing bar 302.

[0055] In some exemplary embodiments, Figure 1-Figure 4 As shown, in this exemplary embodiment, the battery module further includes: a limiting bar. The limiting bar is arranged on the upper surface of the bottom liquid cooling plate 40, and is used to limit the positions of the two columns of battery cells 10. The limiting bar is arranged on the bottom liquid cooling plate 40 to form a protrusion of a certain height. After the module fixing bar 30 is connected to the bottom liquid cooling plate 40, the limiting bar cooperates with the module fixing bar 30 to limit the positions of the two columns of battery cells 10 in a partition, so as to ensure that the positions of the battery cells 10 in the battery module are relatively stable.

[0056] In some exemplary embodiments, the surface (plate surface) of the middle end plate 202 corresponding to the battery cells 10 on both sides thereof is affixed with an insulating sheet. The two columns of battery cells 10 are connected in series, and the battery cells 10 in each column of battery cells 10 are connected in series in sequence. The total positive 601 and the total negative 602 of the battery module are located at the same end of the battery module, the total positive 601 is led to the end of one of the two columns of battery cells 10, and the total negative 602 is led to the end of the other of the two columns of battery cells 10.

[0057] The battery module in one embodiment is described below in conjunction with the assembly process of the battery module. Figure 1-Figure 5 As shown, the battery module in this embodiment includes a battery cell 10, a module fixing bar 30, a limit bar, a side end plate 201, an intermediate end plate 202, a bottom liquid cooling plate 40, long bolts, an insulating sheet (or glue), a connecting copper bar 701, a copper bar mounting base 70 and a CCS assembly 50. The battery module uses a square battery cell 10 with a terminal at one end.

[0058] First, the battery module is divided into left and right sides with the middle end plate 202 as the center. Each battery cell 10 is installed on the bottom liquid cooling plate 40. The surface of the bottom liquid cooling plate 40 is insulated. The middle end plate 202 is first fixed to the bottom liquid cooling plate 40 by tooling.

[0059] Then, with the middle end plate 202 as the center, the batteries on the left and right sides are stacked at the same time. Take the right battery as an example: first, three limit strips are installed on the bottom liquid cooling plate 40, and structural glue is applied between the limit strips. Then, the first column of batteries is installed, and double-sided adhesive insulating sheets are attached to both sides of the middle end plate 202. Double-sided adhesive foam tape is attached to the single large surface 105 of the battery cell 10, or structural glue is applied to the single large surface 105 of the battery cell 10. The un-taped or glued side of the battery cell 10 is attached to the middle end plate 202, and the end face of the lead-out pole side of the battery cell 10 is aligned with the side of the middle end plate 202. In this column of battery cells 10, each battery cell 10 is stacked alternately on the bottom liquid cooling plate 40 with a positive pole at the bottom and a negative pole at the bottom, until the installation of the first column of battery cells 10 is completed.

[0060] The installation method of the second column of battery cells 10 is similar to that of the first column. The opposite sides of the lead-out poles of the two columns of battery cells 10 (i.e., the bottom wall 104) are installed by double-sided adhesive foam tape or structural glue, and the second column of battery cells 10 are installed on the bottom liquid cooling plate 40 alternately with one negative pole at the bottom and one positive pole at the bottom, wherein: the battery cells 10 in the second column of battery cells 10 corresponding to the battery cells 10 in the first column must have one positive pole at the bottom and one negative pole at the bottom, or one negative pole at the bottom and one positive pole at the bottom.

[0061] During the assembly process, it is necessary to ensure that the pole distribution of the battery cells 10 in the corresponding columns on the left and right sides is opposite, that is, the right side uses one positive pole and one negative pole at the bottom, and the left side uses one negative pole and one positive pole at the bottom.

[0062] After the left and right sides are stacked, the contact surfaces of the two side end plates 201 with the battery cells 10 are affixed with double-sided adhesive insulating sheets. The two side end plates 201 are installed on the left and right sides of the two columns of battery cells 10. The side end plates 201 are squeezed simultaneously by tooling to a suitable position, and then the module fixing bars 30 are placed. Each fixing bar is equipped with three long bolts. The module fixing bars 30, the side end plates 201, and the middle end plates 202 are fixed to the bottom liquid cooling plate 40. A nut is provided at the bottom of the bottom liquid cooling plate 40 to be fixed with the long bolts.

[0063] Finally, the current carrier or CCS assembly 50 (busbar assembly) is installed, and the last battery cell 10 is installed on the copper busbar mounting base 70 through the connecting copper busbar 701 and connected in series with the second column of battery cells 10 .

[0064] Since the narrow surface area of ​​the battery in the height direction is larger than the area on the opposite side of the battery output column, the battery contacts the liquid cooling plate through the narrow surface, solving the problem of low heat dissipation efficiency of the liquid cooling plate. The internal heat conduction distance of the battery is reduced, which reduces the temperature difference inside the battery and improves the battery life. The battery explosion-proof valve 102 faces sideways, and the electrolyte will not be sprayed onto the battery surface, reducing the risk of battery fire and explosion, and improving safety.

[0065] An exemplary embodiment of the present utility model further provides an electric device, which includes: any one of the battery modules in the above embodiments.

[0066] It should be noted that the electrical devices described in the embodiments of the present application may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spacecrafts, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0067] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0068] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A battery module, characterized in that: The battery module comprises: A plurality of battery cells, wherein the plurality of battery cells are disposed horizontally and arranged in two rows, wherein a pair of narrow side surfaces of each of the battery cells are disposed up and down, and the bottom walls of the two rows of battery cells are disposed oppositely so that the cover plates of the corresponding battery cells provided with explosion-proof valves are disposed oppositely; The liquid cooling plate is thermally connected to the narrow side surfaces on the upper side and / or the lower side of the corresponding battery cell, and is used to control the temperature of the corresponding battery cell.

2. The battery module according to claim 1, characterized in that: The liquid cooling plate comprises: a top liquid cooling plate, disposed above the corresponding battery cell to be thermally connected to the narrow side surface of the upper side of the battery cell; and / or, The bottom liquid cooling plate is arranged below the corresponding battery cell to be thermally connected to the narrow side surface of the lower side of the battery cell.

3. The battery module according to claim 2, characterized in that: The battery module also includes: The end plate assembly comprises: two side end plates and a middle end plate, wherein the two side end plates are respectively arranged at the two ends of the two columns of battery cells, and the middle end plate is arranged in the middle of the two columns of battery cells; The module fixing bar is connected to the bottom liquid cooling plate through a first connecting member; wherein one end of the first connecting member is connected to the module fixing bar, and the other end is passed through the end plate assembly and fixedly connected to the bottom liquid cooling plate to fix the multiple battery cells.

4. The battery module according to claim 3, characterized in that: The module fixing strip comprises: Two side fixing bars, the two side fixing bars are respectively extended along the arrangement direction of the battery cells in the corresponding columns and are arranged on the top side of the battery module; The middle fixing bar extends along the arrangement direction of the battery cells in any column and is arranged at the positions opposite to the bottom walls of the two columns of battery cells.

5. The battery module according to claim 4, characterized in that: The middle fixing bar is provided with a plurality of pressing sheets for pressing the battery cells. The plurality of pressing sheets are arranged on both sides of the middle fixing bar and correspond one by one to the plurality of battery cells.

6. The battery module according to claim 3, characterized in that: Insulating sheets are attached to the surfaces of the middle end plate corresponding to the battery cells on both sides thereof.

7. The battery module according to any one of claims 2 to 6, characterized in that: The battery module also includes: The limiting strip is arranged on the upper surface of the bottom liquid cooling plate and is used for limiting the positions of the two rows of battery cells.

8. The battery module according to any one of claims 1 to 6, characterized in that: A heat exchange partition is provided between the two rows of battery cells, and a heat exchange flow channel is provided inside the heat exchange partition for controlling the temperature of the corresponding battery cells.

9. The battery module according to any one of claims 1 to 6, characterized in that: The two columns of battery cells are connected in series, and the battery cells in each column of battery cells are connected in series in sequence. The total positive and total negative of the battery module are located at the same end of the battery module, the total positive is led to the end of one of the two columns of battery cells, and the total negative is led to the end of the other of the two columns of battery cells.

10. A battery pack, characterized in that: The battery pack comprises the battery module according to any one of claims 1 to 9.

11. An electrical device, characterized in that: The electrical device comprises the battery module according to any one of claims 1 to 9 or the battery pack according to claim 10.

Images