Battery module and energy storage system

Abstract

The utility model discloses a battery module and an energy storage system, the battery module comprises a battery monomer, a heat conduction structural member and a liquid cooling plate, the liquid cooling plate is internally provided with a cooling flow channel, liquid cooling is performed on the battery module through the liquid cooling plate, the liquid cooling has the advantage of high heat conduction speed compared with air cooling, and the battery module can be rapidly cooled; the liquid cooling plates are arranged on the two sides of the heat conduction structural member in the arrangement direction, the liquid cooling plates cool the two sides of the battery module at the same time, cooling liquid stably flows in the cooling flow channels of the liquid cooling plates, the temperature difference of the battery monomers at different parts of the same battery module is reduced, and the safety performance of the battery module is improved. The energy storage system is provided with at least one battery module, the liquid cooling plates of different battery modules are mutually independent, the multiple battery modules do not interfere with one another during liquid cooling, it is guaranteed that each battery module can be effectively cooled, the problem that the temperatures of the battery modules at different positions in the same energy storage system are greatly different is solved, and the energy storage efficiency is improved. And the safety performance of the energy storage system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy storage batteries, and in particular to a battery module and an energy storage system. Background Art

[0002] With the continuous expansion of the development scale of new energy such as wind power and photovoltaic power generation, realizing the intelligence of the power grid by storing and transmitting electricity will be the optimization trend of the energy system. The energy storage system of power storage mainly uses energy storage batteries (energy storage batteries are batteries used for solar power generation equipment, wind power generation equipment and renewable energy storage energy). The performance requirements of the energy storage system for energy storage batteries are large capacity, long life, fast response and trickle charging. The energy storage battery includes multiple battery modules, each of which has multiple battery cells. The lithium-ion battery in the battery cell has the advantages of high energy density ratio, power density ratio, good charge and discharge efficiency and flexible grouping, which can meet the large-scale energy storage needs in the current energy storage system.

[0003] However, lithium-ion batteries need to be kept at a certain temperature to be used safely and efficiently. If the temperature is too high, the internal active substances of the lithium-ion battery will become active, posing a safety hazard. If the temperature is too low, the internal active substances of the lithium-ion battery will become inactive and the efficiency will decrease. If forced to charge and discharge, lithium precipitation is likely to occur, causing a short circuit and thermal runaway. Therefore, temperature control of lithium-ion batteries is a challenge that large-scale energy storage systems must face in terms of safety design.

[0004] The commonly used temperature control in the prior art is mainly cold air. Air cooling has the advantages of simple structure and low price, but air cooling uses air as the heat transfer medium, the thermal conductivity is low, and the cooling effect is affected by the air flow rate, resulting in large differences in the temperature of lithium-ion batteries in different parts of the same energy storage system, reducing the safety performance of the energy storage system.

[0005] In addition, air cooling requires air ducts to be reserved on the energy storage system, which increases the volume of the energy storage system, reduces the integration rate, and increases infrastructure and transportation costs.

[0006] Therefore, how to reduce the temperature difference of lithium-ion batteries in different parts of the same energy storage system to improve the safety performance of the energy storage system has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0007] The present application proposes a battery module to reduce the temperature difference of lithium-ion batteries in different parts of the same energy storage system to improve the safety performance of the energy storage system. The present application also proposes an energy storage system.

[0008] In order to achieve the above objectives, the present application provides a battery module, comprising:

[0009] Battery cells;

[0010] A heat-conducting structure is arranged along the circumference of the battery cell and is used to absorb the heat of the battery cell. The heat-conducting structure is arranged between two adjacent battery cells and on a side of the battery cell at the head end and the tail end of the battery module away from the adjacent battery cell.

[0011] A liquid cooling plate having a cooling channel is provided on both sides of the arrangement direction of the heat-conducting structural member. The liquid cooling plate is used to absorb the heat of the heat-conducting structural member. The liquid cooling plate is connected to the heat-conducting structural member to fix the heat-conducting structural member and the battery cell.

[0012] Preferably, in the above battery module, the heat-conducting structural member includes a first side plate, a top plate, a second side plate and a bottom plate arranged along the circumference of the battery cell.

[0013] The widths of the first side plate and the second side plate are greater than the widths of the top plate and the bottom plate. The top plate is located between poles of two adjacent battery cells, and the bottom plate is opposite to the top plate.

[0014] Preferably, in the above battery module, the heat-conducting structure further includes a partition plate connected to at least one of the top plate, the bottom plate, the first side plate and the second side plate, and used to separate two adjacent battery cells.

[0015] Preferably, in the above battery module, a vent hole is provided on the partition between two adjacent battery cells.

[0016] Preferably, in the above battery module, a heat-conducting boss corresponding to the position of the pole of the battery cell is arranged on the top plate, and two heat-conducting bosses are respectively in contact with the first side plate and the second side plate.

[0017] Preferably, in the above-mentioned battery module, L-shaped plates are provided at both ends of the length direction of the side plate to which the heat-conducting structure is connected to the liquid cooling plate, the first flat plate of the L-shaped plate is connected to the end of the side plate, and the second flat plate of the L-shaped plate is parallel to the side plate to form a slot between the second flat plate and the side plate.

[0018] The slots are formed at both ends of the side plate in the length direction, and the liquid cooling plate is plug-connected to the two slots. Limiting blocks are provided at both ends of the liquid cooling plate in the length direction for fixing the heat-conducting structure and the battery cell on the liquid cooling plate. A pipeline interface connected to the cooling channel is provided on the limiting block.

[0019] Preferably, in the above battery module, a heat dissipation hollow is provided between the free ends of the second flat plates of the two L-shaped plates.

[0020] Preferably, in the above battery module, side surfaces of two adjacent heat-conducting structural members abut against each other.

[0021] An energy storage system comprises n battery modules, wherein the battery modules are the battery modules described in any of the above schemes, wherein n is a positive integer and n≥1.

[0022] Preferably, the above energy storage system also includes a liquid supply pipe, including 2n branch pipes, a connecting pipe and a main pipe, one end of the branch pipe is connected to the cooling channel of the liquid cooling plate of the battery module, the connecting pipe is connected to the other end of the 2n branch pipes, one end of the main pipe is connected to the connecting pipe, and the other end of the main pipe is connected to the liquid supply device.

[0023] The battery module provided in the embodiment of the present application includes a battery cell, a heat-conducting structural member and a liquid cooling plate. The liquid cooling plate has a cooling channel. Liquid cooling plates are arranged on both sides of the arrangement direction of the heat-conducting structural member. The liquid cooling plates are used to absorb the heat of the heat-conducting structural member. At the same time, the liquid cooling plates are connected to the heat-conducting structural member to achieve the fixation of the heat-conducting structural member and the battery cell. The battery module disclosed in the present application uses a liquid cooling plate to liquid-cool the battery module. Liquid cooling has the advantage of fast heat conduction speed compared to air cooling, and can quickly cool down the battery module; liquid cooling plates are arranged on both sides of the arrangement direction of the heat-conducting structural member. The liquid cooling plates can cool down both sides of the battery module at the same time. The coolant flows stably in the cooling channel of the liquid cooling plate, reducing the temperature difference of the battery cells in different parts of the same battery module and improving the safety performance of the battery module. The energy storage system has at least one battery module, and the liquid cooling plates of different battery modules are independent of each other. There is no mutual interference between multiple battery modules during liquid cooling, ensuring that each battery module can be effectively cooled. This solves the technical problem that the temperature of battery modules in different parts of the same energy storage system with air cooling is greatly different, resulting in reduced safety performance of the energy storage system.

[0024] In this solution, the liquid cooling plate integrates cooling and fixing functions. The battery module does not need to be equipped with a separate cooling structure, which simplifies the structure of the battery module and reduces the volume of a single battery module, thereby reducing the volume of the energy storage system to a certain extent, improving the integration rate of the energy storage system, and reducing infrastructure and transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0026] Figure 1 It is a structural schematic diagram of the connection between the battery module and the liquid supply pipe of the present application;

[0027] Figure 2 It is a schematic structural diagram of a heat-conducting structural member of the battery module of the present application located between two adjacent battery cells;

[0028] Figure 3 It is a schematic diagram of the structure of the heat-conducting structural member located at the end of the battery module of the present application;

[0029] Figure 4 It is a schematic diagram of the structure of the liquid cooling plate of the battery module of the present application;

[0030] Figure 5 It is a schematic diagram of the structure of the liquid supply pipe of the energy storage system of the present application.

[0031] The accompanying drawings are as follows:

[0032] 1-battery cell; 2-heat-conducting structural member; 21-first side plate; 22-top plate; 23-second side plate; 24-bottom plate; 25-partition plate; 26-heat-conducting boss; 27-L-shaped plate; 3-liquid cooling plate; 31-limiting block; 4-liquid supply pipe; 41-branch pipe; 42-connecting pipe; 43-main pipe. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0034] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.

[0035] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0036] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0037] See also Figure 1-Figure 5 .

[0038] Some embodiments of the present application disclose a battery module, including a battery cell 1, a heat-conducting structural component 2 and a liquid cooling plate 3.

[0039] There are multiple battery cells 1, which are stacked and arranged side by side. Adjacent battery cells 1 are connected in series through an electrical connection structure, and the electrical connection structure is used to realize current transmission or electrical signal collection between the battery cells 1;

[0040] The heat-conducting structure 2 is arranged along the circumference of the battery cell 1 to absorb the heat of the battery cell 1. The heat-conducting structure 2 is arranged between two adjacent battery cells 1 and on the side of the battery cell 1 at the head end and the tail end of the battery module away from the adjacent battery cell 1.

[0041] The liquid cooling plate 3 has a cooling channel, and the liquid cooling plate 3 is arranged on both sides of the arrangement direction of the heat-conducting structure 2. The liquid cooling plate 3 is used to absorb the heat of the heat-conducting structure 2. At the same time, the liquid cooling plate 3 is connected to the heat-conducting structure 2 to achieve the fixation of the heat-conducting structure 2 and the battery cell 1. It should be noted here that the arrangement direction of the heat-conducting structure 2 is consistent with the arrangement direction of the battery cell 1, and the heat-conducting structure 2 and the battery cell 1 are arranged at intervals in the arrangement direction of the battery cell 1.

[0042] The battery module disclosed in the present application is liquid-cooled by a liquid cooling plate 3. Liquid cooling has the advantage of fast heat conduction speed compared to air cooling, and can quickly cool down the battery module, reducing the safety hazard caused by the excessive temperature of the battery module; liquid cooling plates 3 are set on both sides of the arrangement direction of the heat-conducting structural member 2, and the liquid cooling plates 3 can cool down both sides of the battery module at the same time. The coolant flows stably in the cooling channel of the liquid cooling plate 3, reducing the temperature difference of the battery cells 1 at different parts of the same battery module, and improving the safety performance of the battery module. The energy storage system has at least one battery module, and the liquid cooling plates 3 of different battery modules are independent of each other. There is no mutual interference between multiple battery modules during liquid cooling, ensuring that each battery module can be effectively cooled, solving the technical problem that the temperature of battery modules at different parts of the same energy storage system with air cooling is greatly different, resulting in reduced safety performance of the energy storage system.

[0043] In this solution, the liquid cooling plate 3 not only has a cooling function but also has the function of fixing the battery cell 1 and the heat-conducting structural member 2, that is, the liquid cooling plate 3 in this solution integrates cooling and fixing functions, and the battery module does not need to be provided with a separate cooling structure, which simplifies the structure of the battery module and reduces the volume of a single battery module, thereby reducing the volume of the energy storage system to a certain extent, improving the integration rate of the energy storage system, and reducing infrastructure and transportation costs.

[0044] In this solution, the liquid cooling plates 3 are arranged on both sides of the arrangement direction of the heat-conducting structural members 2. The liquid cooling plates 3 can dissipate heat on both sides of the battery module at the same time, thereby increasing the heat dissipation area of ​​the battery module and improving the heat dissipation efficiency.

[0045] In other embodiments of the present application, the liquid cooling plate 3 can be not only arranged on both sides of the arrangement direction of the heat-conducting structure 2, but also can be simultaneously arranged at the bottom of the heat-conducting structure 2, thereby enhancing the temperature regulation ability of the battery module and the supporting ability of the battery module.

[0046] It should be noted here that the wall on which the pole of the battery cell 1 is set is the top wall of the battery cell 1, the bottom wall of the battery cell 1 is opposite to the top wall of the battery cell 1, the wall perpendicular to the plane where the battery cell 1 is located is the side wall of the battery cell 1, the top wall, bottom wall and side wall constitute the outer circumference of the battery cell 1, and the circumferential direction of the battery cell 1 is the circumferential direction of the outer circumference of the battery cell 1.

[0047] In this solution, the cooling channels of the liquid cooling plate 3 have various arrangements.

[0048] In some embodiments of the present application, the cooling channel is a linear channel, and the length direction of the linear channel is consistent with the length direction of the liquid cooling plate 3. In this embodiment, the number of cooling channels can be one or more. When there are multiple cooling channels, the multiple cooling channels are arranged side by side along the width direction of the liquid cooling plate 3. Preferably, both ends of the cooling channel are provided with connecting channels inclined toward the liquid inlet and the liquid outlet of the liquid cooling plate 3.

[0049] In other embodiments of the present application, the cooling channel is sawtooth or wave-shaped, the undulating height of the cooling channel is less than the width of the liquid cooling plate 3, and the extension direction of the cooling channel is consistent with the length direction of the liquid cooling plate 3. In this embodiment, the number of cooling channels can be one or more. When there is one cooling channel, the undulating height of the cooling channel is close to the width of the liquid cooling plate 3. When there are multiple cooling channels, multiple cooling channels are arranged side by side along the width direction of the liquid cooling plate 3, or two adjacent cooling channels are staggered in the length direction of the liquid cooling plate 3 and the two adjacent cooling channels are connected to each other.

[0050] In some other embodiments of the present application, the cooling channel is a combination of at least two shapes, such as a combination of a straight line and a wave shape.

[0051] It should be noted here that the width direction of the liquid cooling plate 3 is perpendicular to the length direction of the liquid cooling plate 3 .

[0052] The larger the area of ​​the cooling channel on the liquid cooling plate 3 is, the better the cooling effect of the liquid cooling plate 3 is; at the same time, the liquid cooling plate 3 itself can also play a role in heat dissipation.

[0053] The battery module is not only safe but also efficient under appropriate temperature conditions. When the temperature of the battery module is lower than the appropriate temperature, the supply of cooling liquid to the cooling channel of the liquid cooling plate 3 is stopped to stop cooling the battery module, or a liquid with a certain temperature is supplied to the cooling channel of the liquid cooling plate 3 to heat the battery module so that the temperature of the battery module is raised to an appropriate temperature; when the temperature of the battery module is higher than the appropriate temperature, cooling liquid is supplied to the cooling channel of the liquid cooling plate 3 to cool the battery module, and the temperature of the cooling liquid can be adjusted according to actual needs.

[0054] The coolant may be water, or other liquids that have a cooling function and do not affect the safety performance of the battery module, and is not specifically limited here.

[0055] The battery module disclosed in the present application not only regulates the temperature of the battery module through the liquid cooling plate 3, but also exchanges heat with the battery cell 1 through the heat-conducting structural member 2, thereby further enhancing the efficiency of the heat exchange.

[0056] The heat-conducting structure 2 is arranged along the circumference of the battery cell 1, and can simultaneously exchange heat with the top wall, bottom wall and side wall of the battery cell 1, which can further reduce the accumulation of heat between adjacent battery cells 1 and improve the safety performance of the battery module.

[0057] The heat-conducting structure 2 includes a first side plate 21, a top plate 22, a second side plate 23 and a bottom plate 24, which are arranged along the circumference of the battery cell 1. Figure 2 and Figure 3 As shown, the first side plate 21 and the second side plate 23 are respectively attached to the two side walls of the battery cell 1, the top plate 22 and the bottom plate 24 are respectively attached to the top wall and the bottom wall of the battery cell 1, and the top plate 22 avoids the pole of the battery cell 1, and the bottom plate 24 is opposite to the top plate 22.

[0058] like Figure 2 As shown, the width of the first side plate 21 and the second side plate 23 is greater than the width of the top plate 22 and the bottom plate 24. The top plate 22 is located between the poles of two adjacent battery cells 1, that is, the heat-conducting structure 2 located between two adjacent battery cells 1 can simultaneously conduct heat with the two adjacent battery cells 1. This design further simplifies the structure of the battery module and reduces the processing cost and overall quality of the battery module.

[0059] The widths of the first side plate 21, the second side plate 23, the top plate 22 and the bottom plate 24 are all the dimensions of the first side plate 21, the second side plate 23, the top plate 22 and the bottom plate 24 along the arrangement direction of the battery cells 1. Figure 1 As shown, the width of the top plate 22 is at most equal to the distance between the poles of two adjacent battery cells 1 , and the width of the bottom plate 24 may be equal to or greater than the width of the top plate 22 .

[0060] like Figure 2 As shown, the bottom plate 24 can support the battery cell 1 and cooperate with the first side plate 21 and the second side plate 23 to fix the battery cell 1 .

[0061] Preferably, the first side plates 21 of two adjacent heat-conducting structures 2 can abut against each other in the arrangement direction of the heat-conducting structures 2 to increase the heat-conducting area of ​​the heat-conducting structures 2 and improve the integrity of the sides of the battery module, thereby effectively protecting the battery cells 1.

[0062] In order to further optimize the above technical solution, the heat-conducting structural member 2 of the battery module disclosed in the present application further includes a partition 25 for separating two adjacent battery cells 1 .

[0063] The partition 25 is connected to at least one of the top plate 22, the bottom plate 24, the first side plate 21, and the second side plate 23. The partition 25 can transfer the heat of the battery cells 1 located on both sides of the partition 25 to the top plate 22, the bottom plate 24, the first side plate 21, and the second side plate 23 connected thereto, thereby realizing efficient heat transfer, and can also prevent the combustion from spreading to the adjacent battery cells 1 when thermal runaway occurs in the battery module, thereby controlling the thermal runaway at the cell level and preventing the thermal runaway from spreading.

[0064] Preferably, the partition plate 25 is connected to the top plate 22 , the bottom plate 24 , the first side plate 21 and the second side plate 23 .

[0065] In this solution, the heat-conducting structural member 2 has two installation positions, one of which is between two adjacent battery cells 1, and the other is on the side of the battery cell 1 located at the head and tail ends of the battery module that is not in contact with the adjacent battery cell 1 (or the side away from the adjacent battery cell 1). The heat-conducting structural member 2 located between two adjacent battery cells 1 adopts the above structure, the heat-conducting structural member 2 of the battery cell 1 located at the head and tail ends of the battery module can have the same structure as the above heat-conducting structural member 2, or be half of the above heat-conducting structural member 2, and the heat-conducting structural member 2 on the side of the battery cell 1 located at the head and tail ends of the battery module that is not in contact with the adjacent battery cell 1 can also serve as the end plate of the battery module.

[0066] No through holes are provided on the partition 25 of the heat-conducting structure 2 of the battery cells 1 located at the head and tail ends of the battery module, while a through hole is provided on the partition 25 of the heat-conducting structure 2 located between two adjacent battery cells 1, so as to realize the flow of heat in the battery module and prevent heat from accumulating between two adjacent battery cells 1, so as to reduce the temperature difference between different cells and improve the safety of the operation of the battery module.

[0067] The through hole can be a through hole with a larger size, such as Figure 2 As shown, there may also be a plurality of through holes of smaller size, and the through holes are evenly or unevenly distributed on the partition plate 25 .

[0068] The pole of the battery cell 1 is the position with the highest temperature in the entire battery cell 1. In order to reduce the temperature of the pole position, the present application provides a heat-conducting boss 26 at the position of the top plate 22 corresponding to the pole of the battery cell 1. Figure 1 As shown, the battery cell 1 has a positive electrode column and a negative electrode column, there are two heat-conducting bosses 26 corresponding to the positions of the positive electrode column and the negative electrode column respectively, and the two heat-conducting bosses 26 are respectively in contact with the first side plate 21 and the second side plate 23 to transfer heat to the liquid cooling plate 3.

[0069] Preferably, the size of the heat-conducting boss 26 is larger than the size of the pole, and the width of the heat-conducting boss 26 is at most equal to the width of the top plate 22 .

[0070] The shapes of the two heat-conducting bosses 26 may be the same or different.

[0071] In this solution, the heat-conducting structural member 2 is plug-connected with the liquid cooling plate 3 .

[0072] like Figure 2 and 3 As shown, L-shaped plates 27 are provided at both ends of the length direction of the side plate connecting the heat-conducting structure 2 and the liquid cooling plate 3. The L-shaped plate 27 includes a first horizontal plate and a second horizontal plate. The first horizontal plate is perpendicular to the second horizontal plate. The first horizontal plate is connected to the end of the side plate, and the second horizontal plate is parallel to the side plate. The second horizontal plates of the two L-shaped plates 27 are opposite to each other, and a slot is formed between the second horizontal plate and the side plate.

[0073] Since L-shaped plates 27 are provided at both ends of the side plate in the length direction, slots are formed at both ends of the side plate in the length direction, and the liquid cooling plate 3 is plugged into the two slots at both ends of the side plate in the length direction; a hollow is formed between the two second horizontal plates to facilitate observation of the insertion position of the liquid cooling plate 3, and at the same time, there is no other structure to block the liquid cooling plate 3, and heat can be dissipated through the liquid cooling plate 3.

[0074] The lengths of the second horizontal plates of the L-shaped plates 27 installed at both ends of the side plate in the length direction may be equal or unequal. Preferably, the L-shaped plates 27 are symmetrically distributed at both ends of the side plate in the length direction.

[0075] The liquid cooling plate 3 is connected to the heat-conducting structure 2 through a slot. The width of the liquid cooling plate 3 is greater than the distance between the free ends of the two second horizontal plates, and greater than the distance between the free ends of the first horizontal plate of the L-shaped plate 27 located below and the second horizontal plate of the L-shaped plate 27 located above. At the same time, the width of the liquid cooling plate 3 does not exceed the length of the side plate.

[0076] Limiting blocks 31 are provided at both ends of the liquid cooling plate 3 in the length direction, which are used to limit the heat-conducting structure 2 to prevent the heat-conducting structure 2 located at the end of the battery module from sliding off the liquid cooling plate 3, thereby fixing the heat-conducting structure 2 and the battery cell 1 on the liquid cooling plate 3.

[0077] The limit block 31 is provided with a pipeline interface which is communicated with the cooling channel.

[0078] Specifically, after the liquid cooling plate 3 is connected to the heat-conducting structural member 2 , the limiting block 31 is connected to the liquid cooling plate 3 to fix the heat-conducting structural member 2 and the battery cell 1 on the liquid cooling plate 3 .

[0079] The limiting block 31 and the liquid cooling plate 3 may be fixedly connected or detachably connected.

[0080] The connection method for fixed connection can be welding or riveting.

[0081] The connection method for the detachable connection can be bolt connection, clip connection, or interference fit.

[0082] The length of the limiting block 31 may be greater than the width of the liquid cooling plate 3 , or may be less than the width of the liquid cooling plate 3 , or may be equal to the width of the liquid cooling plate 3 .

[0083] In other embodiments of the present application, the L-shaped plates 27 may also be staggered along the arrangement direction of the heat-conducting structural members 2. Specifically, the L-shaped plate 27 is provided at the first end in the length direction of the side plate of one heat-conducting structural member 2, and the L-shaped plate 27 is provided at the second end in the length direction of the side plate of the other heat-conducting structural member 2. The staggered distribution structure of the L-shaped plates 27 reduces the overall mass of the battery module while ensuring the stable connection between the liquid cooling plate 3 and the heat-conducting structural member 2, and can also improve the temperature regulation capability of the battery module to a certain extent.

[0084] The sizes of the L-shaped plate 27 at the first end of the side plate and the L-shaped plate 27 at the second end of the side plate may be equal or unequal.

[0085] The present application also discloses an energy storage system, comprising n battery modules, wherein the battery modules are the battery modules recorded in any of the above schemes.

[0086] Since the battery module has the above-mentioned technical effects, the energy storage system having the battery module also has the same technical effects, which will not be described in detail here.

[0087] The energy storage system disclosed in the present application also includes a liquid supply pipe 4, which has 2n branch pipes 41, a connecting pipe 42 and a main pipe 43. Figure 5 As shown, the cooling channel of the liquid cooling plate 3 of the battery module is connected to one end of the branch pipe 41, the connecting pipe 42 is connected to the other end of the 2n branch pipes 41, one end of the main pipe 43 is connected to the connecting pipe 42, and the other end of the main pipe 43 is connected to the liquid supply device.

[0088] Multiple battery modules of the energy storage system share one liquid supply pipe 4, and it is only necessary to increase the number of branch pipes 41 on the connecting pipe 42 according to the number of battery modules. Preferably, a valve is provided on the branch pipe 41 to control the connection between the branch pipe 41 and the cooling channel of the liquid cooling plate 3, so as to improve the flexibility of battery module cooling.

[0089] The coolant supplied by the liquid supply device is transported to the connecting pipe 42 through the main pipe 43, and then transported to the 2n branch pipes 41 through the connecting pipe 42. The 2n branch pipes 41 respectively supply the coolant to the cooling channels connected thereto.

[0090] Cooling liquid is supplied to the cooling channels of the liquid cooling plates 3 of different battery modules simultaneously through a main pipe 43. The temperature of the cooling liquid supplied to different battery modules is equal, so that different battery modules are cooled simultaneously by the cooling liquid with equal temperature, so as to reduce the temperature difference of battery modules at different parts in the same energy storage system, so as to improve the safety performance of the energy storage system.

[0091] At the same time, the cooling channel is integrated in the liquid cooling plate 3 for fixing the battery cell 1 and the heat-conducting structural member 2. There is no need to design the liquid cooling structure separately. Not only will the volume of the energy storage system not be increased, but the integration rate of the energy storage system will be enhanced, and the infrastructure and transportation costs will be reduced.

[0092] The energy storage system disclosed in the present application performs functional disassembly and reconstruction of the liquid cooling structure, and designs the liquid cooling system to be distributed and quasi-immersive, which can not only control the temperature of the battery module of the energy storage system more evenly and extend the service life of the battery module, but also control the thermal runaway of the battery module of the energy storage system and control the thermal runaway at the battery cell level to block the spread of the thermal runaway; it can also significantly reduce the cost of the liquid cooling structure and enhance the market competitiveness of the energy storage system.

[0093] The battery module of the energy storage system disclosed in the present application innovatively integrates a liquid cooling structure with a fixed structure, simplifies the redundant structure of the battery module, and reduces the production cost of the battery module.

[0094] The energy storage system disclosed in the present application adopts liquid cooling, which can transfer the heat generated by the battery cells 1 of the battery module to the outside of the energy storage system.

[0095] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. A battery module, characterized in that: include: Battery cell (1); A heat-conducting structural member (2) is arranged along the circumference of the battery cell (1) and is used to absorb the heat of the battery cell (1). The heat-conducting structural member (2) is arranged between two adjacent battery cells (1) and on a side of the battery cell (1) at the head end and the tail end of the battery module away from the adjacent battery cell (1); A liquid cooling plate (3) having a cooling channel is provided on both sides of the arrangement direction of the heat-conducting structural member (2). The liquid cooling plate (3) is used to absorb the heat of the heat-conducting structural member (2). The liquid cooling plate (3) is connected to the heat-conducting structural member (2) to achieve fixation of the heat-conducting structural member (2) and the battery cell (1).

2. The battery module according to claim 1, characterized in that: The heat-conducting structural member (2) comprises a first side plate (21), a top plate (22), a second side plate (23) and a bottom plate (24) arranged along the circumference of the battery cell (1). The width of the first side plate (21) and the second side plate (23) is greater than the width of the top plate (22) and the bottom plate (24); the top plate (22) is located between the poles of two adjacent battery cells (1); and the bottom plate (24) is located opposite to the top plate (22).

3. The battery module according to claim 2, characterized in that: The heat-conducting structural member (2) further comprises a partition (25) connected to at least one of the top plate (22), the bottom plate (24), the first side plate (21) and the second side plate (23), and used for separating two adjacent battery cells (1).

4. The battery module according to claim 3, characterized in that: A vent hole is provided on the partition (25) located between two adjacent battery cells (1).

5. The battery module according to claim 2, characterized in that: The top plate (22) is provided with a heat-conducting boss (26) corresponding to the position of the pole of the battery cell (1), and the two heat-conducting bosses (26) are respectively in contact with the first side plate (21) and the second side plate (23).

6. The battery module according to claim 1, characterized in that: L-shaped plates (27) are provided at both ends of the length direction of the side plate connected to the heat-conducting structural member (2) and the liquid cooling plate (3); a first flat plate of the L-shaped plate (27) is connected to the end of the side plate; a second flat plate of the L-shaped plate (27) is parallel to the side plate to form a slot between the second flat plate and the side plate; The slots are formed at both ends of the side plate in the length direction, the liquid cooling plate (3) is plug-connected to the two slots, and limit clamps (31) are provided at both ends of the liquid cooling plate (3) in the length direction for fixing the heat-conducting structural component (2) and the battery cell (1) on the liquid cooling plate (3), and a pipeline interface communicating with the cooling channel is provided on the limit clamp (31).

7. The battery module according to claim 6, characterized in that: A heat dissipation hollow is provided between the free ends of the second flat plates of the two L-shaped plates (27).

8. The battery module according to claim 1, characterized in that: The side surfaces of two adjacent heat-conducting structural components (2) are in contact with each other.

9. An energy storage system, characterized in that: The invention comprises n battery modules, wherein the battery module is the battery module according to any one of claims 1 to 8, wherein n is a positive integer and n≥1.

10. The energy storage system according to claim 9, characterized in that: It also includes a liquid supply pipe (4), including 2n branch pipes (41), a connecting pipe (42) and a main pipe (43), one end of the branch pipe (41) is connected to the cooling channel of the liquid cooling plate (3) of the battery module, the connecting pipe (42) is connected to the other ends of the 2n branch pipes (41), one end of the main pipe (43) is connected to the connecting pipe (42), and the other end of the main pipe (43) is connected to the liquid supply device.

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