Battery module and energy storage system

Abstract

The utility model relates to a battery module and an energy storage system, and relates to the technical field of energy storage. The battery module comprises at least one battery pack and a first end plate, wherein the battery pack comprises a plurality of battery monomers arranged along a first direction; when the battery module comprises a plurality of battery packs, the plurality of battery packs are arranged along a second direction, and the second direction is intersected with the first direction; the first end plate is positioned at one end of the battery pack along a first direction, the first end plate comprises a main body part, and a first bending part and a second bending part which are positioned on two sides of the main body part along a second direction, and the first bending part and the second bending part are bent towards one side far away from the battery pack along the first direction; fixing areas as many as the battery packs are arranged on the main body part; when the battery module comprises a plurality of battery packs, the plurality of fixing areas and the plurality of battery packs are arranged in a one-to-one correspondence manner; the fixing area is provided with a net-shaped stamping reinforcing structure, and the net-shaped stamping reinforcing structure protrudes along one side, in the first direction, of the first end plate. The distribution density of the net-shaped stamping reinforcing structures is gradually decreased in the direction from the center area of the fixing area to the edge area. According to the battery module provided by the invention, the structural strength of the end plates is improved.

Description

Technical Field

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

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can be recharged to activate the active materials after discharge and continue to be used. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. Since the voltage and capacity of a single secondary battery are limited, in order to meet the high voltage and large capacity requirements of the system, multiple battery cells need to be grouped, that is, several battery cells are combined in series and parallel to form a battery module with a certain voltage and capacity.

[0003] At present, battery cells are generally stacked by two end plates arranged at both ends of the battery pack stacking direction, and then the end plates and the battery pack are bundled with steel tie bands to achieve battery cell stacking and limit the expansion of the battery module during power-on operation; therefore, the structural strength requirements for the end plates are relatively high.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] The purpose of the present disclosure is to provide a battery module and an energy storage system, which improve the structural strength of the end plate.

[0006] According to one aspect of the present disclosure, a battery module is provided, the battery module comprising:

[0007] at least one battery pack, the battery pack comprising a plurality of battery cells arranged along a first direction; when the battery module comprises a plurality of the battery packs, the plurality of the battery packs are arranged along a second direction, the second direction intersecting the first direction;

[0008] a first end plate, the first end plate being located at one end of the battery pack along the first direction, the first end plate comprising a main body and a first bending portion and a second bending portion located at both sides of the main body along the second direction, the first bending portion and the second bending portion being bent along the first direction toward a side away from the battery pack; the main body is provided with fixing areas having the same number as the battery packs; when the battery module comprises a plurality of the battery packs, the plurality of fixing areas are provided in a one-to-one correspondence with the plurality of the battery packs;

[0009] Among them, a mesh stamping reinforcement structure is provided on the fixing area, and the mesh stamping reinforcement structure protrudes along one side of the first end plate in the first direction; the distribution density of the mesh stamping reinforcement structure decreases from the central area of ​​the fixing area toward the edge area.

[0010] The battery module provided by the present disclosure is provided with a mesh stamping reinforcement structure on the fixed area of ​​the first end plate, that is, the mesh stamping reinforcement structure on the first end plate can be formed by a stamping process. Therefore, by setting the mesh stamping reinforcement structure, burrs will not appear on the first end plate due to the setting of the reinforcement structure, thereby avoiding the appearance of burrs on the first end plate and causing safety accidents such as puncturing the battery cell, thereby improving the reliability of the first end plate; the mesh stamping reinforcement structure is formed by stamping, and the corners of the reinforcement structure formed are similar to the structure of circular arc chamfers, and there will be no sharp corner structures, thereby avoiding safety accidents such as puncturing the battery cell, thereby improving the reliability of the first end plate; the mesh stamping reinforcement structure is formed by stamping, and the weight of the first end plate will not be increased due to the setting of the reinforcement structure , thereby reducing the weight of the battery module, improving the energy density of the battery module, and further improving the market competitiveness; through the mesh stamping reinforcement structure, the extrusion force generated when the battery cell expands can be better absorbed, avoiding stress concentration, making the first end plate have better toughness and avoiding cracking; through the mesh stamping reinforcement structure, the contact area between the first end plate and the outside air is increased, thereby improving the heat dissipation effect of the first end plate when the reinforcement structure is set; through the mesh stamping reinforcement structure, the first end plate can be formed by a stamping process, and the stamping process does not require casting mold alignment, pouring raw materials, cooling, mold opening, grinding, flaw detection and other processes, which can increase the manufacturing efficiency of the first end plate by more than several times, reduce production costs, and improve the market competitiveness of the product.

[0011] In an exemplary embodiment of the present disclosure, a first flange facing the main body is formed on one end of the first bending portion away from the main body along the first direction; and / or a second flange facing the main body is formed on one end of the second bending portion away from the main body along the first direction.

[0012] The battery module provided by the present disclosure improves the structural strength of the bending portion where the flange is set by setting a flange on the bending portion, thereby improving the structural strength of the first end plate and effectively utilizing the material properties of the first end plate. At the same time, structural defects such as burrs on the side of the bending portion facing the periphery are avoided.

[0013] In an exemplary embodiment of the present disclosure, in the first direction, the mesh stamping reinforcement structure protrudes toward the side away from the battery pack, and the height of the protrusion of the mesh stamping reinforcement structure is less than or equal to the width of the first bending portion and the second bending portion in the first direction.

[0014] The battery module provided by the present disclosure makes the height of the protrusion of the mesh stamping reinforcement structure less than or equal to the width of the first bending portion and the second bending portion in the first direction. When the cable tie is used to bundle the first end plate and the battery pack, the fixing force exerted by the cable tie acts on the first bending portion and the second bending portion, thereby avoiding the phenomenon that the mesh stamping reinforcement structure lifts up the cable tie when the width of the first bending portion and the second bending portion is small, and can improve the stability of the cable tie on the first end plate.

[0015] In an exemplary embodiment of the present disclosure, a plurality of first protrusions are provided on the first bending portion, and the first protrusions are stamped structures formed on the first bending portion; a first limiting portion is formed between two adjacent first protrusions; a plurality of second protrusions are provided on the second bending portion, and the second protrusions are stamped structures formed on the second bending portion; a second limiting portion is formed between two adjacent second protrusions; the first limiting portion and the second limiting portion cooperate to form a limit for the cable tie on both sides of the first end plate.

[0016] The battery module provided by the present disclosure forms a countersunk hole by punching at the bending portion, and the countersunk hole protrudes toward the periphery of the bending portion to form a protruding portion. While a limiting portion for limiting the cable tie is formed by the two protruding portions, the structural strength of the bending portion is also improved by the punched countersunk hole.

[0017] In an exemplary embodiment of the present disclosure, the first end plate is also provided with a plurality of stamped reinforcement ribs connecting the main body and the first bending portion and connecting the main body and the second bending portion, and the plurality of stamped reinforcement ribs are arranged at least corresponding to the first limiting portion and the second limiting portion.

[0018] The battery module provided by the present disclosure improves the structural strength between the bending portion and the main body by arranging stamped reinforcing ribs, thereby preventing the bending portion from being deformed due to the change in the bending angle of the bending portion relative to the main body; especially after the cable tie is tied to the bending portion, the stamped reinforcing ribs and the limiting portion are arranged correspondingly, so that the position where the cable tie is tied has a higher structural strength to avoid deformation of the bending portion.

[0019] In an exemplary embodiment of the present disclosure, the battery module further includes a first cable tie and a second cable tie, and the first cable tie and the second cable tie are configured to bundle the at least one battery pack and the first end plate; the first cable tie and / or the second cable tie are located in the first limiting portion and the second limiting portion on both sides of the first end plate.

[0020] The battery module provided by the present disclosure provides a limiting portion on the first end plate so that the first tie and the second tie are located in the limiting portion of the first flange, thereby limiting the first tie and the second tie to avoid misalignment of the first tie and the second tie.

[0021] In an exemplary embodiment of the present disclosure, along a third direction intersecting the first direction and the second direction, a third bending portion and a fourth bending portion are further provided on both sides of the main body on the first end plate, and the third bending portion and the fourth bending portion are bent along the first direction toward a side away from the battery pack.

[0022] The battery module provided by the present invention can form the main body, the third bending part and the fourth bending part through a whole plate using a sheet metal bending process, thereby improving the structural strength of the third bending part and the fourth bending part, and further improving the structural strength of the first end plate, thereby effectively utilizing the material properties of the first end plate.

[0023] In an exemplary embodiment of the present disclosure, a first lifting hole is provided on the first bending portion, and a second lifting hole is provided on the second bending portion.

[0024] The battery module provided by the present disclosure can be hoisted through the first hoisting hole and the second hoisting hole.

[0025] In an exemplary embodiment of the present disclosure, the mesh stamping reinforcement structure includes a plurality of annular stamping reinforcement ribs with different diameters, and the plurality of annular stamping reinforcement ribs are concentrically distributed.

[0026] According to the simulation cloud map, the battery module provided by the present invention shows that during the expansion of the battery pack composed of battery cells, the displacement size on the first end plate changes outward in an elliptical radial shape; by arranging multiple annular stamping reinforcement structures on the first end plate, the structural strength of the first end plate can be improved in a targeted manner according to the rule that the displacement size on the first end plate changes outward in an elliptical radial shape.

[0027] In an exemplary embodiment of the present disclosure, in a direction from a central area of ​​the fixing zone toward an edge area, a distance between at least partially adjacent two of the annular stamping reinforcement ribs increases.

[0028] In the battery module provided by the present invention, the distribution density of the mesh stamping reinforcement structure decreases gradually from the central area of ​​the fixed area toward the edge area, so as to absorb the expansion force of the end plate whose displacement size changes radially outward during the expansion process of the battery pack; at the same time, the material strength of the end plate is effectively utilized, reducing the strength requirements of the end plate material itself.

[0029] In an exemplary embodiment of the present disclosure, the mesh stamping reinforcement structure further includes a plurality of strip-shaped stamping reinforcement ribs, and the plurality of strip-shaped stamping reinforcement ribs are radially distributed with the center of the circle of the annular stamping reinforcement rib as the center point.

[0030] The battery module provided by the present invention forms a cross-shaped distributed stamping reinforcement structure by cooperating with multiple strip stamping reinforcement ribs and multiple annular stamping reinforcement ribs, ensuring that the first end plate has sufficient strength in all directions to support the battery pack and disperse the expansion force of the entire battery pack.

[0031] In an exemplary embodiment of the present disclosure, in the circumferential direction of the annular stamping reinforcement rib, the angles between two adjacent strip-shaped stamping reinforcement ribs are the same.

[0032] The battery module provided by the present disclosure has multiple strip-shaped stamped reinforcement ribs evenly distributed, which can further effectively disperse the expansion force of the entire battery pack.

[0033] In an exemplary embodiment of the present disclosure, the mesh stamping reinforcement structure is a symmetrical structure along the second direction.

[0034] The battery module provided by the present disclosure can evenly disperse the expansion force of the entire battery pack in the second direction by making the mesh stamping reinforcement structure a symmetrical structure along the second direction.

[0035] In an exemplary embodiment of the present disclosure, in a third direction intersecting the first direction and the second direction, the mesh stamping reinforcement structure is a symmetrical structure; the first direction is perpendicular to the second direction and the third direction.

[0036] The battery module provided by the present disclosure makes the mesh stamping reinforcement structure a symmetrical structure along the third direction, thereby being able to evenly disperse the expansion force of the entire battery pack in the third direction.

[0037] In an exemplary embodiment of the present disclosure, the mesh stamping reinforcement structure protrudes along the first direction toward a side away from the battery pack.

[0038] The battery module provided by the present invention has a first end plate with a smooth surface on one side for clamping and fixing the battery pack, which can provide a better clamping effect on the battery pack; at the same time, the mesh stamping reinforcement structure faces outward, which can improve the heat dissipation capacity of the first end plate and prevent the structural strength of the first end plate from being excessively affected by high temperature.

[0039] In an exemplary embodiment of the present disclosure, the battery module further includes:

[0040] A second end plate, wherein the second end plate is located at two opposite ends of the battery pack along the first direction from the first end plate, and the second end plate has the same structure as the first end plate.

[0041] The battery module provided by the present disclosure improves the structural strength of the second end plate by making the second end plate completely identical to the first end plate. At the same time, the same mold can be used during production, thereby reducing production costs and improving production efficiency.

[0042] According to another aspect of the present disclosure, there is provided an energy storage system, which includes the battery module provided by any of the above embodiments.

[0043] In the energy storage system provided by the present disclosure, a mesh stamping reinforcement structure is provided on the fixed area of ​​the first end plate in the battery module, that is, the mesh stamping reinforcement structure on the first end plate can be formed by a stamping process. Therefore, by setting the mesh stamping reinforcement structure, burrs will not appear on the first end plate due to the setting of the reinforcement structure, thereby avoiding the occurrence of burrs on the first end plate and causing safety accidents such as puncturing the battery cell, thereby improving the reliability of the first end plate; the mesh stamping reinforcement structure is formed by stamping, and the corners of the reinforcement structure formed are similar to the structure of circular arc chamfers, and there will be no sharp corner structures, thereby avoiding safety accidents such as puncturing the battery cell, thereby improving the reliability of the first end plate; the mesh stamping reinforcement structure is formed by stamping, and the first end plate will not be additionally increased due to the setting of the reinforcement structure. The weight of the battery module can be reduced, the energy density of the battery module can be increased, and the market competitiveness can be improved; the mesh stamping reinforcement structure can better absorb the extrusion force generated when the battery cell expands, avoid stress concentration, and make the first end plate have better toughness and avoid cracking; the mesh stamping reinforcement structure increases the contact area between the first end plate and the outside air, thereby improving the heat dissipation effect of the first end plate when the reinforcement structure is set; the mesh stamping reinforcement structure can be used to form the first end plate by a stamping process, and the stamping process does not require casting mold alignment, pouring raw materials, cooling, mold opening, grinding, flaw detection and other processes, which can increase the manufacturing efficiency of the first end plate by more than several times, reduce production costs, and improve the market competitiveness of the product.

[0044] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0046] Figure 1 A schematic diagram of an energy storage system provided for one embodiment of the present disclosure.

[0047] Figure 2 A schematic diagram of an end plate in the related art provided by the present disclosure.

[0048] Figure 3 A schematic diagram of a battery module provided for one embodiment of the present disclosure.

[0049] Figure 4 An exploded view of a battery module provided in accordance with an embodiment of the present disclosure.

[0050] Figure 5 A front schematic diagram of a first end plate provided for an embodiment of the present disclosure.

[0051] Figure 6 A front view of a first end plate provided for one embodiment of the present disclosure.

[0052] Figure 7 A schematic back view of a first end plate provided for an embodiment of the present disclosure.

[0053] Description of reference numerals:

[0054] 10. Energy storage device; 20. Power grid; 30. First power conversion device; 40. Second power conversion device;

[0055] 100. Battery module;

[0056] 110, battery pack; 111, battery cell; 112, electrical connector; 113, output terminal;

[0057] 210, first end plate; 2110, main body; 2111, first bending portion; 2112, second bending portion; 2113, third bending portion; 2114, fourth bending portion; 2115, fixing area; 2116, fixing hole; 2121, first flange; 2122, second flange; 2131, first protruding portion; 2132, second protruding portion; 2133, first limiting portion; 2134, second limiting portion; 2141, first lifting hole; 2142, second lifting hole; 2150, mesh stamping reinforcement structure; 2151, annular stamping reinforcement rib; 2152, strip stamping reinforcement rib; 2160, stamping reinforcement rib;

[0058] 220, second end plate;

[0059] 310, first cable tie; 320, second cable tie. DETAILED DESCRIPTION

[0060] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0061] Since the energy people need is highly temporal and spatial, in order to rationally use energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, to achieve the goal of carbon neutrality, green energy is currently mainly used to replace fossil energy to achieve the purpose of generating green electricity.

[0062] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0063] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0064] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0065] (1) Large-scale energy storage power stations used in energy storage scenarios on the power generation side, such as wind power and photovoltaic power stations, can assist renewable energy generation in meeting grid connection requirements while improving the utilization rate of renewable energy. As a high-quality active / reactive regulating power source on the power supply side, energy storage power stations can achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the problem of new energy generation and absorption, and are of great significance in power grid system backup, relieving peak load power supply pressure, and peak and frequency regulation.

[0066] (2) Large energy storage containers used in grid-side energy storage scenarios mainly perform peak load regulation, frequency regulation, and grid congestion relief. Peak load regulation can achieve peak load shaving and valley filling of power loads, that is, charging the energy storage battery when the power load is low and releasing the stored electricity during the peak load period, thereby achieving a balance between power production and consumption, such as energy storage power station systems;

[0067] (3) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in household energy storage scenarios on the user side. Their main functions are self-generation and self-use of electricity, peak shaving and valley filling, capacity cost management, and improved power supply reliability. According to different application scenarios, energy storage on the power consumption side can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity costs. In addition, communication base stations, data centers and other fields need to be equipped with energy storage for backup power supply. In addition, in remote areas, as well as areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0068] Figure 1 A schematic diagram of an energy storage system provided in an embodiment of the present disclosure, and the present disclosure Figure 1 The embodiment is described by taking the shared energy storage scenario on the power generation / distribution side as an example. The energy storage system disclosed in the present invention is not limited to the energy storage scenario on the power generation / distribution side, but can also be applied to scenarios on the industrial and commercial side or the user side.

[0069] like Figure 1As shown, the energy storage system includes: an energy storage device 10, a power grid 20, a first power conversion device 30, and a second power conversion device 40. In the case of power generation, the first power conversion device 30 and the second power conversion device 40 are used to convert other forms of energy into electric energy, connect to the power grid 20, and supply it to the power distribution network. When the power load is low and the first power conversion device 30 and the second power conversion device 40 generate excess power, the excess power is stored in the energy storage device 10 to reduce the wind and solar power abandonment rates and improve the problem of new energy power generation and consumption. When the power load is high, the power grid issues an instruction to use the power stored in the energy storage device 10 in conjunction with the power grid 20 to transmit power to the power consumption side in a grid-connected mode, providing peak-shaving, frequency regulation, standby and other services for the operation of the power grid, giving full play to the peak-shaving role of the power grid 20, promoting the peak-shaving and valley-filling of the power grid 20, and alleviating the power supply pressure of the power grid 20.

[0070] Among them, the first power conversion device 30 can be a solar energy conversion device, and the second power conversion device 40 can be a wind energy conversion device; of course, the power conversion device can also be a device that converts at least one of thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0071] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 10 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0072] The energy storage device 10 may include a battery module. The battery module includes a plurality of battery cells. When the plurality of battery cells are fixed, end plates may be assembled at both ends, and the plurality of battery cells may be bundled together by the end plates and tie bands. The battery cells may be lithium-ion secondary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc. The battery cells may be cylindrical, flat, rectangular, etc., and the embodiments of the present application do not limit this.

[0073] In the related technology, the common end plate is the die-cast A380 material end plate. The elastic modulus, tensile strength and elongation at break of this metal material are relatively excellent, which can basically meet the expansion of the battery cell during the working cycle and ensure the structural strength.

[0074] However, if Figure 2As shown, the common die-cast end plate 200' has a relatively regular shape, which results in a wasteful design. When the battery module is simulated for expansion force, it is found that the end plate has basically reached the limit state, the end plate has been permanently deformed, and the battery cell has a risk of failure; the design does not maximize the use of the structure to effectively utilize the material properties, and cannot fully absorb the force of the battery cell expansion, resulting in the failure of the end plate, and the material limit has not been reached at this time.

[0075] In view of the above technical problems, the present disclosure provides a battery module, such as Figure 3 to Figure 7 As shown, the battery module 100 includes at least one battery pack 110 and a first end plate 210, and the battery pack 110 includes a plurality of battery cells 111 arranged along a first direction X; when the battery module 100 includes a plurality of battery packs 110, the plurality of battery packs 110 are arranged along a second direction Y, and the second direction Y intersects with the first direction X; the first end plate 210 is located at one end of the battery pack 110 along the first direction X, and the first end plate 210 is provided with fixing areas 2115 having the same number as the battery packs 110; when the battery module 100 includes a plurality of battery packs 110, the plurality of fixing areas 2115 are arranged in a one-to-one correspondence with the plurality of battery packs 110.

[0076] Among them, the first end plate 210 includes a main body 2110, a first bending portion 2111 and a second bending portion 2112, the first bending portion 2111 and the second bending portion 2112 are located on both sides of the main body 2110 along the second direction Y, and the first bending portion 2111 and the second bending portion 2112 are bent along the first direction X toward the side away from the battery pack 110.

[0077] Among them, a mesh stamping reinforcement structure 2150 is provided on the fixed area 2115, and the mesh stamping reinforcement structure 2150 protrudes along one side of the first end plate 210 in the first direction X; the distribution density of the mesh stamping reinforcement structure 2150 decreases from the central area of ​​the fixed area 2115 toward the edge area.

[0078] It should be noted that the mesh stamping reinforcement structure 2150 refers to a reinforcing rib structure formed by a stamping process on the main body 2110 of the first end plate 210, and the reinforcing rib structure formed by the stamping process is distributed in a mesh on the first end plate 210. The mesh stamping reinforcement structure 2150 may include a plurality of cross-connected reinforcing ribs, and the distribution density of the mesh stamping reinforcement structure 2150 reflects the density of the distribution of the plurality of reinforcing ribs on the first end plate 210, and the distribution density can be reflected by the number of distributions per unit area on the first end plate 210. For example, the distribution density of the mesh stamping reinforcement structure 2150 can be that in an area where multiple reinforcement ribs are distributed on the main body 2110 of the first end plate 210, the number of reinforcement ribs distributed per unit area can be expressed as the ratio of the number of multiple reinforcement ribs to the area of ​​the area where multiple reinforcement ribs are distributed; when the number of reinforcement ribs in the mesh stamping reinforcement structure 2150 in a unit area is greater than the number of reinforcement ribs in the mesh stamping reinforcement structure 2150 in another unit area, it is determined that the distribution density of the mesh stamping reinforcement structure 2150 in the unit area is greater than the distribution density of the mesh stamping reinforcement structure 2150 in the other area; at the same time, the distribution density of the mesh stamping reinforcement structure 2150 can also be reflected by the average distance between multiple reinforcement ribs. For example, among multiple reinforcement ribs, the average value of the distance between each two is the average distance. The larger the average distance, the more sparsely the multiple reinforcement ribs are distributed, and the smaller the average distance, the denser the multiple reinforcement ribs are distributed. When the average distance between two adjacent reinforcing ribs in a mesh stamping reinforcement structure 2150 in a unit area is smaller than the average distance between two adjacent reinforcing ribs in another unit area, the distribution density of the mesh stamping reinforcement structure 2150 in the unit area is determined to be greater than the distribution density of the mesh stamping reinforcement structure 2150 in another area. When the distribution density is determined by the number of reinforcing ribs in a unit area and the distance between two adjacent reinforcing ribs, the widths of the plurality of reinforcing ribs may be the same or substantially the same.

[0079] The battery module 100 provided in the present disclosure can form a main body 2110, a first bending portion 2111 and a second bending portion 2112 through a whole plate by using a sheet metal bending process, thereby improving the structural strength of the first bending portion 2111, and further improving the structural strength of the first end plate 210, thereby effectively utilizing the material properties of the first end plate 210. At the same time, a mesh stamping reinforcement structure 2150 is provided on the fixed area 2115 of the first end plate 210, that is, the mesh stamping reinforcement structure 2150 on the first end plate 210 can be formed by a stamping process. Therefore, by setting the mesh stamping reinforcement structure 2150, burrs will not appear on the first end plate 210 due to the setting of the reinforcement structure, thereby avoiding the occurrence of burrs on the first end plate 210 and causing safety accidents such as puncturing the battery cells, thereby improving the reliability of the first end plate 210; the mesh stamping reinforcement structure 2150 is formed by stamping, and the corners of the reinforcement structure formed are similar to the structure of circular arc chamfers, and there will be no sharp corner structure, thereby avoiding safety accidents such as puncturing the battery cells, thereby improving the reliability of the first end plate 210; the mesh stamping reinforcement structure 2150 is formed by stamping, and the weight of the first end plate 210 will not be increased due to the setting of the reinforcement structure, thereby reducing the weight of the battery module 100, improving the energy density of the battery module 100, and thus improving market competitiveness. competitiveness; through the mesh stamping reinforcement structure 2150, the extrusion force generated when the battery cell expands can be better absorbed, stress concentration can be avoided, and the first end plate 210 has better toughness and avoids cracking; through the mesh stamping reinforcement structure 2150, the contact area between the first end plate 210 and the outside air is increased, thereby improving the heat dissipation effect of the first end plate 210 when the reinforcement structure is set; through the mesh stamping reinforcement structure 2150, the thickness of the first end plate 210 can be avoided from increasing when the reinforcement structure is set on the first end plate 210, thereby reducing the weight of the battery module, improving the energy density of the battery module, and further improving the market competitiveness; through the mesh stamping reinforcement structure 2150, the first end plate 210 can be formed by a stamping process, and the stamping process does not require casting mold alignment, pouring raw materials, cooling, mold opening, grinding, flaw detection and other processes, which can increase the manufacturing efficiency of the first end plate 210 by more than several times, reduce production costs, and improve the market competitiveness of products.

[0080] In addition, the distribution density of the mesh stamping reinforcement structure 2150 decreases gradually from the central area of ​​the fixed area 2115 toward the edge area. Therefore, the mesh stamping reinforcement structure 2150 can absorb the expansion force of the first end plate 210 whose displacement size changes radially outward during the expansion of the battery pack 110. The mesh stamping reinforcement structure 2150 is more in line with the expansion change law of the battery pack 110, avoiding the risk of failure of the battery cell 111; at the same time, the mesh stamping reinforcement structure 2150 is a stamping structure formed on the first end plate 210, which effectively utilizes the material strength of the first end plate 210, reduces the strength requirements of the first end plate 210 material itself, and reduces the material cost of the first end plate 210; in addition, by forming the mesh stamping reinforcement structure 2150 of the stamping structure on the first end plate 210, a recessed structure is formed on the other side of the first end plate 210 opposite to the mesh stamping reinforcement structure 2150, which can improve the heat dissipation capacity of the first end plate 210, thereby improving the heat dissipation capacity of the battery module 100.

[0081] In one embodiment, the stacking direction of the plurality of battery cells 111 in the battery pack 110 along the first direction X is perpendicular to the large surface of the battery cell 111. By stacking the plurality of battery cells 111 in a direction perpendicular to the large surface of the battery cell 111, the space occupied by the plurality of battery cells 111 after being stacked can be made smaller. The large surface of the battery cell 111 can be considered as the surface with the largest area of ​​the battery cell 111. Further, the large surface of the battery cell 111 can be considered as the surface with the largest heat generation of the battery cell 111. For example, when the battery cell 111 is a square battery, the battery cell 111 includes two opposite large surfaces.

[0082] Among them, the battery cell 111 includes a battery cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charging / discharging. The battery cell of the battery cell 111 refers to a unit formed by winding or laminating a stacking portion, which includes a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Among them, the polarity of the first electrode and the second electrode can be interchanged. The battery cell is arranged in the battery housing of the battery cell 111.

[0083] Among them, the battery cell 111 can be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a wound battery cell. Of course, the battery cell 111 can also be a laminated battery, which is not only convenient for grouping, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0084] Among them, the battery cell 111 can be a square battery, that is, the battery cell 111 can be a quadrangular prism battery. The quadrangular prism battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, but can be arc transitions. Of course, the battery cell 111 can be a cylindrical battery, and the present disclosure does not limit this.

[0085] In one embodiment, Figure 3 to Figure 7 As shown, the battery module 100 includes a battery pack 110, and a fixing area 2115 is matched on the first end plate 210; below, this application takes the battery module 100 including a battery pack 110, and a fixing area 2115 is matched on the first end plate 210 as an example to introduce the structure of the first end plate 210 in detail.

[0086] like Figure 5 As shown, a first flange 2121 facing the main body 2110 is formed on one end of the first bent portion 2111 away from the main body 2110 along the first direction X. By providing the first flange 2121 on the first bent portion 2111, the structural strength of the first bent portion 2111 where the first flange 2121 is provided is improved, thereby improving the structural strength of the first end plate 210, and effectively utilizing the material properties of the first end plate 210. At the same time, structural defects such as burrs on the side of the first bent portion 2111 facing the periphery are avoided.

[0087] Among them, a second flange 2122 facing the main body 2110 is formed on the end of the second bent portion 2112 away from the main body 2110 along the first direction X. By providing the second flange 2122 on the second bent portion 2112, the structural strength of the second bent portion 2112 where the second flange 2122 is provided is improved, thereby improving the structural strength of the first end plate 210, and effectively utilizing the material properties of the first end plate 210. At the same time, structural defects such as burrs on the side of the second bent portion 2112 facing the periphery are avoided.

[0088] like Figure 2 to Figure 5As shown, in the first direction X, the mesh stamping reinforcement structure 2150 protrudes toward the side away from the battery pack 110, and the height of the protrusion of the mesh stamping reinforcement structure 2150 is less than or equal to the width of the first bending portion 2111 and the second bending portion 2112 in the first direction X. By making the height of the protrusion of the mesh stamping reinforcement structure 2150 less than or equal to the width of the first bending portion 2111 and the second bending portion 2112 in the first direction X, when the cable tie is used to tie the first end plate 210 and the battery pack 110, the fixing force applied by the cable tie acts on the first bending portion 2111 and the second bending portion 2112, thereby avoiding the phenomenon that the mesh stamping reinforcement structure 2150 lifts up the cable tie when the width of the first bending portion 2111 and the second bending portion 2112 is small, and the stability of the cable tie on the first end plate 210 can be improved.

[0089] like Figure 5 to Figure 7 As shown, a plurality of first protrusions 2131 are provided on the first bending portion 2111, and the first protrusions 2131 are stamped structures formed on the first bending portion 2111; a first stopper 2133 is formed between two adjacent first protrusions 2131. A plurality of second protrusions 2132 are provided on the second bending portion 2112, and the second protrusions 2132 are stamped structures formed on the second bending portion 2112; a second stopper 2134 is formed between two adjacent second protrusions 2132. The first stopper 2133 cooperates with the second stopper 2134 to limit the cable tie on both sides of the first end plate 210.

[0090] Among them, a countersunk hole can be formed by punching on the first bending portion 2111, and the countersunk hole protrudes toward the periphery of the first bending portion 2111 to form a first protruding portion 2131. While the first limiting portion 2133 for limiting the cable tie is formed by the two first protruding portions 2131, the punched countersunk hole also improves the structural strength of the first bending portion 2111. Similarly, a countersunk hole can be formed by punching on the second bending portion 2112, and the countersunk hole protrudes toward the periphery of the second bending portion 2112 to form a second protruding portion 2132. While the second limiting portion 2134 for limiting the cable tie is formed by the two second protruding portions 2132, the punched countersunk hole also improves the structural strength of the second bending portion 2112.

[0091] like Figure 5As shown, the first end plate 210 is also provided with a plurality of stamped reinforcing ribs 2160 connecting the main body 2110 and the first bending portion 2111 and connecting the main body 2110 and the second bending portion 2112, and the plurality of stamped reinforcing ribs 2160 are arranged at least corresponding to the first limiting portion 2133 and the second limiting portion 2134. By arranging the stamped reinforcing ribs 2160, the strength between the main body 2110 and the first bending portion 2111 and the second bending portion 2112 is improved, so as to avoid the first bending portion 2111 and the second bending portion 2112 being deformed due to the change of the bending angles relative to the main body 2110 after the first bending portion 2111 and the second bending portion 2112 are subjected to force; especially after the cable tie is tied to the first bending portion 2111 and the second bending portion 2112, by arranging a plurality of stamped reinforcing ribs 2160 corresponding to the first limiting portion 2133 and the second limiting portion 2134, the position where the cable tie is tied has a higher structural strength, so as to avoid the deformation of the first bending portion 2111 and the second bending portion 2112.

[0092] Among them, the stamped reinforcing rib 2160 can be a rib, which can be formed by sheet metal stamping on the main body 2110 and the first bending portion 2111 and the second bending portion 2112, so that the stamped reinforcing rib 2160 and the main body 2110, the first bending portion 2111 and the second bending portion 2112 are an integrated structure.

[0093] like Figure 3 and Figure 4 As shown, the battery module 100 is provided with a first tie 310 and a second tie 320, and the first tie 310 and the second tie 320 are spaced apart on the first end plate 210 along the third direction Z. By providing a first limiting portion 2133 and a second limiting portion 2134 on the first end plate 210, the first tie 310 and the second tie 320 are located in the first limiting portion 2133 of the first bending portion 2111 and in the second limiting portion 2134 of the second bending portion 2112, thereby limiting the first tie 310 and the second tie 320, and avoiding misalignment of the first tie 310 and the second tie 320.

[0094] like Figure 5 As shown, the first bending portion 2111 is provided with a first lifting hole 2141, and the second bending portion 2112 is provided with a second lifting hole 2142. After the first end plate 210 is assembled with the battery pack 110 into a module, the module can be lifted through the first lifting hole 2141 and the second lifting hole 2142. The number and position of the first lifting hole 2141 and the second lifting hole 2142 can be set as needed, and the present disclosure does not limit this.

[0095] In one embodiment, Figure 5As shown, along the third direction Z, the first end plate 210 is provided with a third bending portion 2113 and a fourth bending portion 2114 on both sides of the main body 2110, and the third bending portion 2113 and the fourth bending portion 2114 are bent along the first direction X toward the side away from the battery pack 110. The third bending portion 2113 and the fourth bending portion 2114 are sheet metal bending structures formed at the edge of the main body 2110. The main body 2110 and the third bending portion 2113 and the fourth bending portion 2114 can be formed by a whole plate using a sheet metal bending process, thereby improving the structural strength of the third bending portion 2113 and the fourth bending portion 2114, thereby improving the structural strength of the first end plate 210, and effectively utilizing the material properties of the first end plate 210.

[0096] The third bending portion 2113 and the fourth bending portion 2114 are provided with fixing holes 2116. After the first end plate 210 and the battery pack 110 are assembled into a module, the module can be locked through the fixing holes 2116. The number and position of the fixing holes 2116 can be set as needed, and the present disclosure does not limit this.

[0097] In one embodiment, Figures 4 to 7 As shown, the mesh stamping reinforcement structure 2150 is arranged on the surface of the first end plate 210 facing away from the battery group 110, and a recessed structure corresponding to the mesh stamping reinforcement structure 2150 is formed on the surface of the first end plate 210 facing the battery group 110, which can enhance the heat dissipation capacity of the first end plate 210; at the same time, the mesh stamping reinforcement structure 2150 faces outward, and the heat dissipation capacity of the first end plate 210 can be further enhanced through the mesh stamping reinforcement structure 2150, thereby preventing the structural strength of the first end plate 210 from being excessively affected by high temperature.

[0098] Of course, the mesh-shaped stamping reinforcement structure 2150 can also be provided on the surface of the first end plate 210 facing the battery pack 110; in this case, another pad can be separately provided between the first end plate 210 and the battery pack 110, and the expansion force generated by the battery pack 110 is transmitted to the first end plate 210 through the pad. In addition, the mesh-shaped stamping reinforcement structure 2150 with stamping protrusions can be provided on both opposite sides of the first end plate 210, and the present disclosure does not limit this.

[0099] In one embodiment, Figure 5 As shown, the mesh stamping reinforcement structure 2150 includes a plurality of annular stamping reinforcement ribs 2151 of different diameters, and the plurality of annular stamping reinforcement ribs 2151 are concentrically arranged. During the expansion process of the battery pack 110 composed of battery cells 111, the displacement size on the first end plate 210 changes outward in an elliptical radial shape; by arranging a plurality of annular stamping reinforcement ribs 2151 on the first end plate 210, the structural strength of the first end plate 210 can be specifically improved according to the law that the displacement size on the first end plate 210 changes outward in an elliptical radial shape.

[0100] Among them, in the direction from the central area of ​​the fixed area 2115 to the edge area, the spacing between at least part of the adjacent two annular stamping reinforcement ribs 2151 increases. By increasing the spacing between the two adjacent annular stamping reinforcement ribs 2151, that is, the distribution density of the mesh stamping reinforcement structure 2150 decreases from the central area of ​​the fixed area 2115 to the edge area, so as to absorb the expansion force of the battery pack 110 in the process of expansion, the displacement size of the end plate changes radially outward; at the same time, the material strength of the end plate is effectively utilized, and the strength requirements of the end plate material itself are reduced. Of course, in the direction from the central area of ​​the fixed area 2115 to the edge area, the spacing between the two adjacent annular stamping reinforcement ribs 2151 can also be the same.

[0101] For example, the displacement limits of the simulation cloud map are 50.0 mm, 70.9 mm, 89.1 mm, and 105.0 mm from the center of the force, respectively. The arc diameter of the first end plate 210 can be designed based on these parameters. According to different battery packs 110, this rule can be used to optimize the end plate.

[0102] In one embodiment, Figure 5 As shown, the mesh stamping reinforcement structure 2150 also includes a plurality of strip stamping reinforcement ribs 2152, and the plurality of strip stamping reinforcement ribs 2152 are radially distributed with the center of the annular stamping reinforcement rib 2151 as the center point. Through the cooperation of the plurality of strip stamping reinforcement ribs 2152 and the plurality of annular stamping reinforcement ribs 2151, a mesh stamping reinforcement structure similar to a cross is formed, ensuring that the first end plate 210 has sufficient strength in all directions to support the battery pack 110, so as to disperse the expansion force of the entire battery pack 110.

[0103] Among them, Figure 6 As shown, in the circumferential direction of the annular stamped reinforcement rib 2151 , the angle ∠A between two adjacent strip stamped reinforcement ribs 2152 is the same, that is, the multiple strip stamped reinforcement ribs 2152 are evenly distributed, which can further effectively disperse the expansion force of the entire battery pack 110 .

[0104] Among them, for example, three annular stamping reinforcement ribs 2151 can be provided, and three annular stamping reinforcement ribs 2151 with different diameters are concentrically arranged, and the spacing between two adjacent annular stamping reinforcement ribs 2151 increases from the central area of ​​the first end plate 210 toward the edge area. Eight strip-shaped stamping reinforcement ribs 2152 can be provided, and the eight strip-shaped stamping reinforcement ribs 2152 are evenly distributed radially with the dot of the annular stamping reinforcement rib 2151 as the center, so as to ensure that the first end plate 210 has sufficient strength in all directions to support and disperse the expansion force of the entire battery pack 110.

[0105] Of course, the number of annular stamped reinforcement ribs 2151 can also be two, four, five or more, and the spacing between two adjacent annular stamped reinforcement ribs 2151 in the direction from the center area of ​​the first end plate 210 toward the edge area increases, and the spacing between two adjacent annular stamped reinforcement ribs 2151 in the direction from the center area of ​​the first end plate 210 toward the edge area can also be the same; the number of strip stamped reinforcement ribs 2152 can be two, three, four or more, and the angle between two adjacent strip stamped reinforcement ribs 2152 can be the same, and the angle between two adjacent strip stamped reinforcement ribs 2152 can also be different, and the present disclosure does not impose any restrictions on this.

[0106] In one embodiment, Figure 6 As shown, the mesh punching reinforcement structure 2150 is a symmetrical structure along the second direction Y. By making the mesh punching reinforcement structure 2150 a symmetrical structure along the second direction Y, the expansion force of the entire battery pack 110 can be evenly dispersed in the second direction Y.

[0107] Among them, Figure 6 As shown, the mesh punching reinforcement structure 2150 is a symmetrical structure in the third direction Z. By making the mesh punching reinforcement structure 2150 a symmetrical structure along the third direction Z, the expansion force of the entire battery pack 110 can be evenly dispersed in the third direction Z.

[0108] In one embodiment, in the third direction Z, the first tie 310 and the second tie 320 are symmetrically arranged relative to the center of the mesh stamping reinforcement structure 2150, that is, the stamping reinforcement ribs 2160 arranged on both sides of the third direction Z of the mesh stamping reinforcement structure 2150 are symmetrically arranged, so that the restraining force of the first tie 310 and the second tie 320 on the first end plate 210 is uniform, which can reduce the uneven force that causes local premature failure of the first end plate 210.

[0109] In one embodiment, Figure 3 and Figure 4 As shown, the battery module 100 also includes: a second end plate 220, which is located at both ends of the battery pack 110 along the first direction X with the first end plate 210 to form a clamp for the battery pack 110, and the first end plate 210, the battery pack 110 and the second end plate 220 are bundled and fixed together by the first tie 310 and the second tie 320.

[0110] The electrodes of the multiple battery cells 111 in the battery pack 110 are connected together through electrical connectors 112 to achieve series or parallel connection; the battery cells 111 at both ends of the battery pack 110 are provided with output terminals 113 to enable the battery pack 110 to be charged and discharged.

[0111] The second end plate 220 can be completely identical to the first end plate 210, and its specific structure and beneficial effects refer to the detailed discussion in the above-mentioned first end plate 210 embodiment, which will not be repeated here. By making the second end plate 220 and the first end plate 210 completely identical, the same mold can be used during production and manufacturing, which reduces production costs and improves production efficiency. Of course, the second end plate 220 and the first end plate 210 can also be mirror-symmetrical structures, or the second end plate 220 and the first end plate 210 have different structures, which is not limited by the present disclosure.

[0112] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0113] In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the embodiments of the application.

[0114] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0115] The above are only preferred embodiments of the embodiments of the present application, and are not intended to limit the application embodiments. After considering the specification and practicing the invention disclosed herein, those skilled in the art will easily think of other embodiments of the present disclosure. The present application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are indicated by the attached claims.

Claims

1. A battery module, characterized in that: include: at least one battery pack, the battery pack comprising a plurality of battery cells arranged along a first direction; When the battery module includes a plurality of the battery packs, the plurality of the battery packs are arranged along a second direction, and the second direction intersects with the first direction; a first end plate, the first end plate being located at one end of the battery pack along the first direction, the first end plate comprising a main body and a first bending portion and a second bending portion located at both sides of the main body along the second direction, the first bending portion and the second bending portion being bent along the first direction toward a side away from the battery pack; the main body is provided with fixing areas having the same number as the battery packs; when the battery module comprises a plurality of the battery packs, the plurality of fixing areas are provided in a one-to-one correspondence with the plurality of the battery packs; Among them, a mesh stamping reinforcement structure is provided on the fixing area, and the mesh stamping reinforcement structure protrudes along one side of the first end plate in the first direction. The distribution density of the mesh stamping reinforcement structure decreases from the central area of ​​the fixing area toward the edge area.

2. The battery module according to claim 1, characterized in that: A first flange facing the main body is formed on one end of the first bending portion away from the main body along the first direction; and / or a second flange facing the main body is formed on one end of the second bending portion away from the main body along the first direction.

3. The battery module according to claim 1, characterized in that: In the first direction, the mesh stamping reinforcement structure protrudes toward a side away from the battery pack, and a height of the protrusion of the mesh stamping reinforcement structure is less than or equal to a width of the first bending portion and the second bending portion in the first direction.

4. The battery module according to claim 1, characterized in that: A plurality of first protrusions are provided on the first bending portion, and the first protrusions are stamped structures formed on the first bending portion; a first limiting portion is formed between two adjacent first protrusions; a plurality of second protrusions are provided on the second bending portion, and the second protrusions are stamped structures formed on the second bending portion; a second limiting portion is formed between two adjacent second protrusions; the first limiting portion and the second limiting portion cooperate to form a limit for the cable tie on both sides of the first end plate.

5. The battery module according to claim 4, characterized in that: The first end plate is also provided with a plurality of stamped reinforcement ribs connecting the main body and the first bending portion and connecting the main body and the second bending portion, and the plurality of stamped reinforcement ribs are at least arranged corresponding to the first limiting portion and the second limiting portion.

6. The battery module according to claim 4, characterized in that: The battery module also includes a first tie and a second tie, and the first tie and the second tie are configured to bundle the at least one battery pack and the first end plate; the first tie and / or the second tie are located in the first limiting portion and the second limiting portion on both sides of the first end plate.

7. The battery module according to claim 1, characterized in that: Along a third direction intersecting the first direction and the second direction, a third bending portion and a fourth bending portion are provided on both sides of the main body on the first end plate, and the third bending portion and the fourth bending portion are bent along the first direction toward a side away from the battery pack.

8. The battery module according to claim 1, characterized in that: The first bending portion is provided with a first hanging hole, and the second bending portion is provided with a second hanging hole.

9. The battery module according to claim 1, characterized in that: The mesh stamping reinforcement structure includes a plurality of annular stamping reinforcement ribs with different diameters, and the plurality of annular stamping reinforcement ribs are concentrically distributed.

10. The battery module according to claim 9, characterized in that: In a direction from the central area of ​​the fixing zone toward the edge area, the distance between at least two adjacent annular stamping reinforcement ribs increases gradually.

11. The battery module according to claim 9, characterized in that: The mesh stamping reinforcement structure also includes a plurality of strip-shaped stamping reinforcement ribs, and the plurality of strip-shaped stamping reinforcement ribs are radially distributed with the center of the circle of the annular stamping reinforcement rib as the center point.

12. The battery module according to claim 11, characterized in that: In the circumferential direction of the annular stamping reinforcement rib, the angles between two adjacent strip-shaped stamping reinforcement ribs are the same.

13. The battery module according to any one of claims 1, 9 to 12, characterized in that: The mesh stamping reinforcement structure is a symmetrical structure along the second direction.

14. The battery module according to claim 13, characterized in that: In a third direction intersecting the first direction and the second direction, the mesh stamping reinforcement structure is a symmetrical structure; the first direction is perpendicular to the second direction and the third direction.

15. The battery module according to any one of claims 9 to 12, characterized in that: The mesh stamping reinforcement structure protrudes along the first direction toward a side away from the battery pack.

16. The battery module according to claim 1, characterized in that: The battery module also includes: A second end plate, wherein the second end plate is located at two opposite ends of the battery pack along the first direction from the first end plate, and the second end plate has the same structure as the first end plate.

17. An energy storage system, characterized in that: A battery module comprising any one of claims 1 to 16.

Images