Battery module and engineering machinery

Abstract

The invention discloses a battery module and engineering machinery, relates to the field of batteries, and aims to improve the thermal management effect of the battery module and improve the refrigeration effect and temperature uniformity of the battery module. The battery module comprises a battery cell, a first refrigeration assembly and a second refrigeration assembly, the first refrigeration assembly is attached to the first side face of the battery cell. The second refrigeration assembly is attached to the second side face of the battery cell, and the first side face is parallel to the second side face. Flow paths of the first refrigeration assembly and the second refrigeration assembly are independent. In the first direction, the first inlet of the first refrigeration assembly is located on one side of the first outlet of the first refrigeration assembly, and the second inlet of the second refrigeration assembly is located on the other side of the second outlet of the second refrigeration assembly. According to the technical scheme, the cooling efficiency and the cooling effect on the battery cell can be improved, the temperature uniformity of the battery cell is improved, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery module and engineering machinery. Background Art

[0002] For power batteries, the battery thermal management system plays a vital role in the stability and safety of power batteries. In related technologies, the battery thermal management system controls the temperature of the battery cell within an appropriate temperature range by setting a liquid cooling plate at the bottom of the battery.

[0003] The inventors found that the existing technology has at least the following problems: liquid cooling plates are only suitable for small-capacity batteries. With the continuous improvement of battery integration and space utilization, large-capacity batteries and high-capacity battery modules are gradually being widely used, but the existing liquid cooling plates cannot meet the cooling needs of large-capacity batteries and high-capacity battery modules. Summary of the invention

[0004] The present invention provides a battery module and an engineering machine, which are used to improve the thermal management effect of the battery module and improve the cooling effect and temperature uniformity of the battery module.

[0005] An embodiment of the present invention provides a battery module, comprising:

[0006] Battery cells;

[0007] A first cooling assembly is arranged in close contact with the first side surface of the battery core; and

[0008] A second cooling assembly is arranged in contact with the second side surface of the battery core, and the first side surface is parallel to the second side surface;

[0009] The flow paths of the first refrigeration component and the second refrigeration component are independent; along the first direction, the first inlet of the first refrigeration component is located on one side of the first outlet of the first refrigeration component, and the second inlet of the second refrigeration component is located on the other side of the second outlet of the second refrigeration component.

[0010] In some embodiments, there are multiple battery cells, and the multiple battery cells are arranged side by side. Each of the battery cells is equipped with one first refrigeration assembly and one second refrigeration assembly.

[0011] In some embodiments, the battery module further comprises:

[0012] a first liquid inlet manifold, comprising a plurality of first flow outlets, each of the first flow outlets corresponding to the first refrigeration components one by one, each of the first flow outlets being connected to one of the first inlets, and each of the first refrigeration components being a parallel branch; and

[0013] The first liquid outlet main pipe includes a plurality of first reflux ports, wherein the first reflux ports correspond one-to-one to the first refrigeration components, and each of the first reflux ports is connected to one of the first outlets.

[0014] In some embodiments, the battery module further comprises:

[0015] a second liquid inlet manifold, comprising a plurality of second flow outlets, each of the second flow outlets corresponding to the second refrigeration components one by one, each of the second flow outlets being connected to one of the second inlets, and each of the second refrigeration components being a parallel branch; and

[0016] The second liquid outlet main pipe includes a plurality of second reflux ports, each of the second reflux ports corresponds to the second refrigeration components one by one, and each of the second reflux ports is connected to one of the second outlets.

[0017] In some embodiments, the first inlet of the first refrigeration assembly is located directly above the second outlet of the second refrigeration assembly; and the first outlet of the first refrigeration assembly is located directly above the second inlet of the second refrigeration assembly.

[0018] In some embodiments, along the first direction, a flow direction of the refrigerant in the first refrigeration assembly is opposite to a flow direction of the refrigerant in the second refrigeration assembly.

[0019] In some embodiments, along the second direction, the flow direction of the refrigerant in the first refrigeration component is the same as the flow direction of the refrigerant in the second refrigeration component; wherein the first direction is perpendicular to the second direction, and the plane in which the first direction and the second direction are located is parallel to the first side.

[0020] In some embodiments, the first side surface and the second side surface are two sides of the battery cell having the largest cross-sectional area.

[0021] In some embodiments, the number of the battery cells is at least two, each of the battery cells is arranged in one-to-one correspondence with the first refrigeration assembly, the first refrigeration assemblies of two adjacent battery cells are arranged side by side, and the first inlet of one of the first refrigeration assemblies is adjacent to the first outlet of the adjacent first refrigeration assembly.

[0022] In some embodiments, each of the battery cells is arranged in one-to-one correspondence with the second refrigeration assembly, the second refrigeration assemblies of two adjacent battery cells are arranged side by side, and the second outlet of one of the second refrigeration assemblies is adjacent to the second inlet of the adjacent second refrigeration assembly.

[0023] In some embodiments, for the same battery cell, the first cooling assembly at the top of the battery cell and the second cooling assembly at the bottom of the battery cell are centrally symmetrically distributed relative to the center of the battery cell.

[0024] In some embodiments, there are multiple battery cells, the multiple battery cells are arranged side by side, and at least two of the battery cells are jointly equipped with a first refrigeration assembly and a second refrigeration assembly.

[0025] In some embodiments, along the first direction, the flow directions of the refrigerants in the first refrigeration assembly and the second refrigeration assembly are opposite.

[0026] In some embodiments, a plurality of battery cells that share a group of the first refrigeration assembly and the second refrigeration assembly are grouped together, and the first refrigeration assembly and the second refrigeration assembly are symmetrically arranged relative to the center of the group of battery cells.

[0027] An embodiment of the present invention further provides an engineering vehicle, comprising a battery module provided by any technical solution of the present invention.

[0028] The battery module provided by the above technical solution is provided with a first refrigeration assembly and a second refrigeration assembly for each battery cell. The first refrigeration assembly and the second refrigeration assembly cool the battery cell at the same time. On the one hand, it can improve the cooling efficiency and cooling effect of the battery cell. On the other hand, it makes the cooling objects of each first refrigeration assembly and the second refrigeration assembly less, and the coolant inflow and outflow strokes of the first refrigeration assembly and the second refrigeration assembly are respectively short, and the temperature difference between the coolant inflow and outflow is small. After cooling, the temperature of each area of ​​the battery cell is relatively consistent, the temperature difference is small, and the temperature is more uniform, which effectively improves the temperature uniformity of the battery cell itself, helps to increase the service life of the battery cell, improve the safety of the battery pack, and effectively reduce the probability of battery module heating and overheating during charging and discharging and use in high temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 A schematic diagram of the three-dimensional structure of a battery module provided in an embodiment of the present invention.

[0031] Figure 2 A schematic front view of a battery module provided in an embodiment of the present invention.

[0032] Figure 3 A schematic diagram of the refrigerant flow direction inside the first refrigeration assembly and the second refrigeration assembly of the battery module provided in an embodiment of the present invention.

[0033] Figure 4A schematic diagram of the relative positions of the battery cells, the first refrigeration assembly and the second refrigeration assembly of the battery module provided in an embodiment of the present invention, and the refrigerant flow direction.

[0034] Reference numerals:

[0035] 1. Battery cell; 2. First refrigeration assembly; 3. Second refrigeration assembly; 4. First liquid inlet manifold; 5. First liquid outlet manifold; 6. Second liquid inlet manifold; 7. Second liquid outlet manifold;

[0036] 21. First inlet; 22. First outlet; 31. Second inlet; 32. Second outlet; 41. First outflow outlet; 51. First reflux outlet; 61. Second outflow outlet; 62. Second reflux outlet. DETAILED DESCRIPTION

[0037] Combine the following Figure 1 to Figure 4 The technical solution provided by the present invention is described in more detail. The description of the exemplary embodiments is merely illustrative and is by no means intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​described in these embodiments should be interpreted as being merely exemplary and not limiting.

[0038] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements.

[0039] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0040] All terms used in the present disclosure, including technical terms or scientific terms, have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment are considered part of the specification.

[0042] The dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. In the drawings, the same reference numerals are attached to common structural elements or structural elements of the same type, and their repeated descriptions are appropriately omitted.

[0043] In the description of the specific embodiments below, for the convenience of explanation, an XYZ coordinate system is established. The X-axis and the Y-axis are both located in the horizontal plane, the direction along the arrangement of the multiple battery cells in the horizontal plane is defined as the first direction, and the direction perpendicular to the first direction in the horizontal plane is defined as the second direction. The Z-axis is perpendicular to both the first direction and the second direction. Figure 1-2 In the figure, the X-axis direction is equivalent to the left-right direction (lateral direction), the Y-axis direction is equivalent to the up-down direction (depth direction), and the Z-axis direction is equivalent to the front-back direction (height direction). The plane where the first direction and the second direction are located is parallel to one of the side surfaces of the battery cell. Here, the plane is parallel to the largest side surface of the battery cell as an example.

[0044] The inventors have found through research that the battery thermal management system of the existing battery module uses a liquid cooling plate to cool the battery cell. The cooling efficiency of the liquid cooling plate is low. The liquid cooling plate is arranged close to one of the sides of the battery cell. The temperature difference between the side where the liquid cooling plate is set and the other side opposite to the side of the battery cell is large. During the cooling process, the temperature of the coolant in the liquid cooling plate gradually rises along the flow direction of the fluid. As the battery module power increases, the volume of the battery module and the number of battery cells also increase synchronously. The flow of the coolant inside the liquid cooling plate increases, which makes the temperature difference between the inlet and outlet of the coolant greater, resulting in a gradual decrease in the temperature difference between the battery cell and the coolant along the flow direction of the coolant. The cooling rate of the battery cell is low, resulting in a large temperature difference between the various battery cells of the battery module. The inconsistent temperature of each battery cell will seriously affect the service life of the battery module. For this reason, the industry is in urgent need of a product that can meet the cooling needs of large-capacity battery modules. The battery module proposed in the following technical solution of the embodiment of the present invention has a good cooling effect.

[0045] Figure 1 A schematic diagram of the three-dimensional structure of a battery module provided in an embodiment of the present invention. Figure 2 A schematic front view of a battery module provided in an embodiment of the present invention. Figure 3 A schematic diagram of the refrigerant flow direction inside the first refrigeration assembly and the second refrigeration assembly of the battery module provided in an embodiment of the present invention. Figure 4 A schematic diagram of the relative positions of the battery cells, the first refrigeration assembly and the second refrigeration assembly of the battery module provided in an embodiment of the present invention, and the refrigerant flow direction.

[0046] See also Figure 1, an embodiment of the present invention provides a battery module, including a battery cell 1, a first refrigeration assembly 2 and a second refrigeration assembly 3. The first refrigeration assembly 2 is arranged in close contact with the first side of the battery cell 1. The second refrigeration assembly 3 is arranged in close contact with the second side of the battery cell 1, and the first side and the second side are parallel. The flow paths of the first refrigeration assembly 2 and the second refrigeration assembly 3 are independent; wherein, along the first direction, the first inlet 21 of the first refrigeration assembly 2 is located on one side of the first outlet 22 of the first refrigeration assembly 2, and the second inlet 31 of the second refrigeration assembly 3 is located on the other side of the second outlet 32 ​​of the second refrigeration assembly 3.

[0047] The battery cell 1 is the core component of the battery module, which directly affects the overall performance and service life of the battery module. The battery cell 1 includes a positive electrode, a negative electrode, a diaphragm and an electrolyte. The positive electrode material uses materials such as lithium nickel cobalt aluminum oxide (NCA), lithium cobalt oxide (LCO) or lithium iron phosphorus (LFP), which have high potential and energy density. The negative electrode material uses graphite or silicon-based materials. Graphite has good conductivity and stability, while silicon materials can improve energy density. The diaphragm is a porous material placed between the positive and negative electrodes. The diaphragm allows lithium ions to pass through while effectively preventing short circuits between the positive and negative electrodes. The diaphragm material is usually polyethylene (PE) or polypropylene (PP). The electrolyte is the medium for the chemical reaction of the battery. The electrolyte uses a mixture of organic solvents and lithium salts, which can conduct ions during the charging and discharging process of the battery.

[0048] The battery cell 1 may be a laminated battery cell, which is a battery cell in which the positive electrode, the negative electrode and the separator are stacked in parallel, effectively utilizing the surface area of ​​the material and increasing the energy density of the battery. The laminated battery cell has good thermal conductivity, and the heat inside the battery cell 1 is transferred to each surface of the battery cell 1.

[0049] In some embodiments, the battery module includes a plurality of battery cells 1, and the battery cells 1 are generally in the shape of a cuboid. The battery cells 1 are placed in a flat manner, with one of the largest side surfaces of the battery cell 1 as the bottom surface, and the other largest side surface of the battery cell 1 as the top surface. Each battery cell 1 is individually equipped with a first refrigeration component 2 and a second refrigeration component 3. The first refrigeration component 2 is bonded to the top surface of the battery cell 1, and the second refrigeration component 3 is bonded to the bottom surface of the battery cell 1. The first refrigeration component 2 and the second refrigeration component 3 are bonded to the side surface with the largest area of ​​the battery cell 1, so the cooling area is large, the cooling effect is good, the cooling speed is fast, and the efficiency is high.

[0050] The first refrigeration assembly 2 and the second refrigeration assembly 3 each include a flow channel that is reciprocatingly arranged or arranged in an S shape. The first refrigeration assembly 2 and the second refrigeration assembly 3 can both be formed by stamping or other methods to form the above-mentioned flow channel. The flow channel of the first refrigeration assembly 2 almost covers the entire top surface of the battery cell 1, and the flow channel of the second refrigeration assembly 3 almost covers the bottom surface of the battery cell 1.

[0051] The first refrigeration assembly 2 and the second refrigeration assembly 3 are both used to cool the battery core 1. The coolants in the first refrigeration assembly 2 and the second refrigeration assembly 3 are two independent fluids. One coolant flows in from the first inlet 21 of the first refrigeration assembly 2 and flows out from the first outlet 22; the other coolant flows in from the second inlet 31 of the second refrigeration assembly 3 and flows out from the second outlet 32.

[0052] Figure 3 and Figure 4 In the figure, the flow channel of the first refrigeration component 2 includes four sections, namely the flow channel indicated by arrow S1, the flow channel indicated by arrow S2, the flow channel indicated by arrow S3, and the flow channel indicated by arrow S4. The flow channel of the second refrigeration component 3 includes four sections, namely the flow channel indicated by arrow S5, the flow channel indicated by arrow S6, the flow channel indicated by arrow S7, and the flow channel indicated by arrow S8.

[0053] Flow direction of the refrigerant in the first refrigeration component 2 : the refrigerant flows in from the first inlet 21 of the first refrigeration component 2 , flows along the directions of S1 , S2 , S3 , S4 , and finally flows out from the first outlet 22 of the first refrigeration component 2 .

[0054] Flow direction of the refrigerant in the second refrigeration component 3 : the refrigerant flows in from the second inlet 31 of the second refrigeration component 3 , flows along the directions of S5 , S6 , S7 , and S8 , and finally flows out from the second outlet 32 ​​of the second refrigeration component 3 .

[0055] As described above, the battery module includes a plurality of battery cells 1, and a first refrigeration assembly 2 is provided on the top surface of each battery cell 1. The first refrigeration assembly 2 of each battery cell 1 is independent, and the refrigerant does not flow from one first refrigeration assembly 2 to another first refrigeration assembly 2, but flows in from the first inlet 21 of each first refrigeration assembly 2 itself, and flows out from the first outlet 22 of each first refrigeration assembly 2 itself. In order to make the temperature of the refrigerant flowing into each first refrigeration assembly 2 more balanced, the battery module also includes a first liquid inlet manifold 4 and a first liquid outlet manifold 5. The first liquid inlet manifold 4 includes a plurality of first flow outlets 41, and the first flow outlets 41 correspond to the first refrigeration assemblies 2 one by one. Each first flow outlet 41 is connected to a first inlet 21, and each first refrigeration assembly 2 is a parallel branch. The first liquid outlet manifold 5 includes a plurality of first reflux ports 51, and the first reflux ports 51 correspond to the first refrigeration assemblies 2 one by one. Each first reflux port 51 is connected to a first outlet 22. In some embodiments, taking the battery module including four battery cells 1 as an example, the first liquid inlet manifold 4 includes four first flow outlets 41, and the first liquid outlet manifold 5 includes four first return ports 51. Each first refrigeration assembly 2 is connected through a parallel pipeline to ensure that the inlet temperature and flow rate of each first refrigeration assembly 2 remain consistent, and ultimately the cooling effect of each battery cell 1 tends to be the same.

[0056] Continue to see Figures 1 to 3 , the battery module also includes a second liquid inlet manifold 6 and a second liquid outlet manifold 7. The second liquid inlet manifold 6 includes a plurality of second flow outlets 61, each of which corresponds to the second refrigeration assembly 3 one by one, and each second flow outlet 61 is connected to a second inlet 31, and each second refrigeration assembly 3 is a parallel branch. The second liquid outlet manifold 7 includes a plurality of second return ports 62, each of which corresponds to the second refrigeration assembly 3 one by one, and each second return port 62 is connected to a second outlet 32. In some embodiments, taking the battery module including four battery cells 1 as an example, the second liquid inlet manifold 6 includes 4 second flow outlets 61, and the second liquid outlet manifold 7 includes 4 second return ports 62. Each second refrigeration assembly 3 is connected by a parallel pipeline to ensure that the inlet temperature and flow rate of each second refrigeration assembly 3 remain consistent, so that the cooling effect of each battery cell 1 is the same, and finally the temperature of each battery cell 1 of the battery module is consistent.

[0057] For the same battery cell 1, for its first refrigeration assembly 2 and second refrigeration assembly 3, in the first direction, i.e., the X direction, the first inlet 21 of the first refrigeration assembly 2 is located on the left, and the first outlet 22 of the first refrigeration assembly 2 is located on the right. The second inlet 31 of the second refrigeration assembly 3 is located on the right, and the first outlet 22 of the first refrigeration assembly 2 is located on the left. Figure 3 In some embodiments, along the first direction, the flow direction of the refrigerant in the first refrigeration assembly 2 is opposite to the flow direction of the refrigerant in the second refrigeration assembly 3. That is, in the X direction, the flow direction of the refrigerant in the first refrigeration assembly 2 is from left to right, and the flow direction of the refrigerant in the second refrigeration assembly 3 is from right to left.

[0058] In some embodiments, along the second direction, the flow direction of the refrigerant in the first refrigeration assembly 2 is the same as the flow direction of the refrigerant in the second refrigeration assembly 3. The details are as follows.

[0059] In the Y direction, the flow direction of the refrigerant in the flow channel indicated by arrow S1 is the same as the flow direction of the refrigerant in the flow channel indicated by arrow S8. And the flow channel indicated by arrow S1 is located directly above the flow channel indicated by arrow S8, and the so-called directly above means that the flow channel indicated by arrow S1 and the flow channel indicated by arrow S8 correspond to the same coordinate on the X axis.

[0060] In the Y direction, the flow direction of the refrigerant in the flow channel indicated by arrow S2 is the same as the flow direction of the refrigerant in the flow channel indicated by arrow S7. And the flow channel indicated by arrow S2 is located directly above the flow channel indicated by arrow S7, and the so-called directly above means that the flow channel indicated by arrow S2 and the flow channel indicated by arrow S7 correspond to the same coordinate on the X axis.

[0061] In the Y direction, the flow direction of the refrigerant in the flow channel indicated by arrow S3 is the same as the flow direction of the refrigerant in the flow channel indicated by arrow S6. And the flow channel indicated by arrow S3 is located directly above the flow channel indicated by arrow S6, and the so-called directly above means that the flow channel indicated by arrow S3 and the flow channel indicated by arrow S6 correspond to the same coordinate on the X axis.

[0062] In the Y direction, the flow direction of the refrigerant in the flow channel indicated by arrow S4 is the same as the flow direction of the refrigerant in the flow channel indicated by arrow S5. And the flow channel indicated by arrow S4 is located directly above the flow channel indicated by arrow S5, and the so-called directly above means that the flow channel indicated by arrow S4 and the flow channel indicated by arrow S5 correspond to the same coordinate on the X axis.

[0063] For the same battery cell 1, the first refrigeration component 2 at the top and the second refrigeration component 3 at the bottom are arranged in the above manner, so that the colder refrigerant in the first refrigeration component 2 is located on the left side of the top of the battery cell 1, and the hotter refrigerant is located on the right side of the top; the colder refrigerant in the second refrigeration component 3 is located on the right side of the bottom of the battery cell 1, and the hotter refrigerant is located on the left side of the bottom. The fluid can be symmetrically distributed on both sides of the battery cell 1, thereby improving the temperature uniformity of the battery cell 1 and the entire battery module during cooling.

[0064] by Figure 3 Taking the leftmost group of the first refrigeration assembly 2 and the second refrigeration assembly 3 as an example, the refrigerant in the flow channel corresponding to the arrow S1 is the coldest and has a good cooling effect. The flow channel corresponding to the arrow S8 of the second refrigeration assembly 3 at the bottom of the same position of the battery cell 1 (meaning that the coordinates of the X-axis are roughly the same) has the highest temperature of the refrigerant in the flow channel. Similarly, the refrigerant in the flow channel corresponding to the arrow S4 is the hottest fluid area of ​​the top liquid cooling plate, and the refrigerant in the flow channel corresponding to the arrow S5 is the coldest fluid area of ​​the bottom liquid cooling plate. Along the X-axis direction, the battery cell 1 will not be hot at one end and cold at the other. Since the sides of the battery cell 1 will conduct heat to each other, the top plate and the bottom plate of the battery cell 1 will exchange heat with the side plate. This setting method of the embodiment of the present invention is more efficient in heat exchange, and the battery cell 1 can reach a balanced temperature faster. In addition, this method has a short heat transfer path. For example, the temperature on the left side of the top plate of the battery cell 1 is the lowest, so it can quickly cool down the left side plate of the battery cell 1; the temperature on the right side of the bottom plate of the battery cell 1 is the lowest, so it can quickly cool down the right side plate of the battery cell 1. During the entire cooling process, the top plate and the side plates are close to each other, and the bottom plate and the side plates are also close to each other, the heat transfer path is very short, and the temperature uniformity of each part of the battery cell 1 is good.

[0065] Continue to see Figure 3In some embodiments, the first inlet 21 of the first refrigeration assembly 2 is located directly above the second outlet 32 ​​of the second refrigeration assembly 3. The first outlet 22 of the first refrigeration assembly 2 is located directly above the second inlet 31 of the second refrigeration assembly 3. The so-called directly above means that the first inlet 21 at the top of the same battery cell 1 and the second outlet 32 ​​at the bottom of the battery cell 1 correspond to the same coordinate on the X-axis. The first outlet 22 at the top of the same battery cell 1 and the second inlet 31 at the bottom of the battery cell 1 correspond to the same coordinate on the X-axis.

[0066] See also Figure 3 For the same battery cell 1 , the first cooling assembly 2 installed on the top of the battery cell 1 and the second cooling assembly 3 installed on the bottom of the battery cell 1 are centrally symmetrically distributed relative to the center of the battery cell 1 .

[0067] Continue to see Figure 1 or Figure 3 In some embodiments, the number of battery cells 1 is at least two, and each battery cell 1 is arranged in one-to-one correspondence with the first refrigeration assembly 2. The first refrigeration assemblies 2 of two adjacent battery cells 1 are arranged side by side, and the first inlet 21 of one of the first refrigeration assemblies 2 is adjacent to the first outlet 22 of the adjacent first refrigeration assembly 2. There is also heat conduction between two adjacent battery cells 1. The higher temperature of the top plate of one battery cell 1 is adjacent to the lower temperature of the top plate of the adjacent battery cell 1, and the higher temperature of the bottom plate of one battery cell 1 is adjacent to the lower temperature of the bottom plate of the adjacent battery cell 1. The temperature of the battery cells 1 and the battery cells 1 tend to be consistent through heat conduction between two adjacent battery cells 1, which improves the uniformity of the temperature of each battery cell 1 in the entire battery module, effectively improves the service life of the battery, and effectively reduces the probability of battery module heating and overheating during charging and discharging and use in high temperature environments.

[0068] In some embodiments, each battery cell 1 is arranged in one-to-one correspondence with the second refrigeration assembly 3 , the second refrigeration assemblies 3 of two adjacent battery cells 1 are arranged side by side, and the second outlet 32 ​​of one second refrigeration assembly 3 is adjacent to the second inlet 31 of the adjacent second refrigeration assembly 3 .

[0069] In some other embodiments, there are multiple battery cells 1 , which are arranged side by side, and at least two battery cells 1 are jointly provided with a first refrigeration assembly 2 and a second refrigeration assembly 3 .

[0070] A plurality of battery cells 1 that share a set of first cooling assembly 2 and second cooling assembly 3 form a group of battery cells 1, and the first cooling assembly 2 and second cooling assembly 3 are arranged symmetrically relative to the center of the group of battery cells 1. This arrangement can also improve the temperature uniformity of the battery cells 1 and the battery module.

[0071] Specifically, along the first direction, the refrigerant in the first refrigeration assembly 2 and the second refrigeration assembly 3 flows in opposite directions. This arrangement can also improve the temperature consistency of various parts of the battery core 1, improve the cooling efficiency, and improve the temperature uniformity of the battery core 1 and the battery module.

[0072] An embodiment of the present invention further provides an engineering vehicle, comprising a battery module provided by any technical solution of the present invention.

[0073] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the protection content of the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0074] In the description of the present invention, each technical feature may be combined with other technical features where feasible.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery module, characterized in that: include: Battery cell (1); A first cooling assembly (2) is arranged in close contact with a first side surface of the battery core (1); as well as A second cooling assembly (3) is arranged in close contact with a second side surface of the battery core (1), wherein the first side surface and the second side surface are parallel; The flow paths of the first refrigeration component (2) and the second refrigeration component (3) are independent; along a first direction, the first inlet (21) of the first refrigeration component (2) is located on one side of the first outlet (22) of the first refrigeration component (2), and the second inlet (31) of the second refrigeration component (3) is located on the other side of the second outlet (32) of the second refrigeration component (3).

2. The battery module according to claim 1, characterized in that: There are a plurality of battery cells (1), and the plurality of battery cells (1) are arranged side by side. Each battery cell (1) is provided with a first refrigeration component (2) and a second refrigeration component (3).

3. The battery module according to claim 2, characterized in that: Also includes: a first liquid inlet main pipe (4), comprising a plurality of first flow outlets (41), wherein the first flow outlets (41) correspond one to one with the first refrigeration components (2), each of the first flow outlets (41) is connected to one of the first inlets (21), and each of the first refrigeration components (2) is a branch connected in parallel; and The first liquid outlet main pipe (5) comprises a plurality of first reflux ports (51), wherein the first reflux ports (51) correspond one-to-one to the first refrigeration components (2), and each of the first reflux ports (51) is connected to one of the first outlets (22).

4. The battery module according to claim 2, characterized in that: Also includes: A second liquid inlet main pipe (6) comprising a plurality of second flow outlets (61), wherein the second flow outlets (61) correspond one to one with the second refrigeration components (3), each of the second flow outlets (61) is connected to one of the second inlets (31), and each of the second refrigeration components (3) is a branch connected in parallel; as well as The second liquid outlet main pipe (7) comprises a plurality of second return ports (62), wherein the second return ports (62) correspond one-to-one to the second refrigeration components (3), and each of the second return ports (62) is connected to one of the second outlets (32).

5. The battery module according to any one of claims 1 to 4, characterized in that: The first inlet (21) of the first refrigeration component (2) is located directly above the second outlet (32) of the second refrigeration component (3); and the first outlet (22) of the first refrigeration component (2) is located directly above the second inlet (31) of the second refrigeration component (3).

6. The battery module according to any one of claims 1 to 4, characterized in that: Along the first direction, the flow direction of the refrigerant in the first refrigeration component (2) is opposite to the flow direction of the refrigerant in the second refrigeration component (3).

7. The battery module according to claim 1, characterized in that: Along the second direction, the flow direction of the refrigerant in the first refrigeration component (2) is the same as the flow direction of the refrigerant in the second refrigeration component (3); wherein the first direction is perpendicular to the second direction, and a plane in which the first direction and the second direction are located is parallel to the first side surface.

8. The battery module according to claim 1, characterized in that: The first side surface and the second side surface are the two side surfaces of the battery cell (1) with the largest transverse area.

9. The battery module according to claim 1, characterized in that: The number of the battery cells (1) is at least two, each of the battery cells (1) is arranged in one-to-one correspondence with the first refrigeration assembly (2), the first refrigeration assemblies (2) of two adjacent battery cells (1) are arranged side by side, and the first inlet (21) of one of the first refrigeration assemblies (2) is adjacent to the first outlet (22) of the adjacent first refrigeration assembly (2).

10. The battery module according to claim 9, characterized in that: Each of the battery cells (1) is arranged in one-to-one correspondence with the second refrigeration assembly (3), the second refrigeration assemblies (3) of two adjacent battery cells (1) are arranged side by side, and the second outlet (32) of one of the second refrigeration assemblies (3) is adjacent to the second inlet (31) of the adjacent second refrigeration assembly (3).

11. The battery module according to claim 1, characterized in that: For the same battery cell (1), the first cooling assembly (2) at the top of the battery cell (1) and the second cooling assembly (3) at the bottom of the battery cell (1) are centrally symmetrically distributed relative to the center of the battery cell (1).

12. The battery module according to claim 1, characterized in that: The number of the battery cells (1) is multiple, the multiple battery cells (1) are arranged side by side, and at least two of the battery cells (1) are jointly provided with a first refrigeration assembly (2) and a second refrigeration assembly (3).

13. The battery module according to claim 12, characterized in that: Along a first direction, the flow directions of the refrigerants in the first refrigeration component (2) and the second refrigeration component (3) are opposite.

14. The battery module according to claim 12, characterized in that: A plurality of battery cells (1) that share a group of the first refrigeration assembly (2) and the second refrigeration assembly (3) form a group, and the first refrigeration assembly (2) and the second refrigeration assembly (3) are arranged symmetrically relative to the center of the group of battery cells (1).

15. An engineering vehicle, characterized in that: A battery module comprising any one of claims 1 to 14.

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