Energy storage device and power supply system

Abstract

The invention discloses an energy storage device and a power supply system. The energy storage device comprises a lower box body, a battery module and a reinforcing structure. The lower box body comprises a cold plate and an enclosure frame, and the cold plate and the enclosure frame define a containing cavity. The battery module is arranged in the accommodating cavity; the reinforcing structure comprises a first reinforcing piece and a second reinforcing piece, the first reinforcing piece and the second reinforcing piece are fixedly arranged on the side, opposite to the battery module, of the cold plate, the orthographic projection of the first reinforcing piece and the orthographic projection of the second reinforcing piece on a target plane have a first overlapping area, and the target plane is perpendicular to the height direction of the battery module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an energy storage device and a power supply system. BACKGROUND

[0002] In the related art, the cold plate of the battery pack is designed integrally with the bottom plate of the lower box body. The cold plate not only bears the structural support and protection function of the lower box body, but also directly realizes efficient thermal management of the battery. At the same time, synergistic advantages are formed in the dimensions of space, cost, and reliability. However, when the cold plate deforms or is damaged due to deformation, the sealing, load-bearing capacity, and installation stability of the battery pack are all affected. SUMMARY

[0003] The energy storage device and the power supply system provided by the embodiments of the present application solve the problem that the cold plate is prone to deformation in the related art.

[0004] The energy storage device provided by the embodiments of the present application includes a lower box body, a battery module, and a reinforcing structure. The lower box body includes a cold plate and a surrounding frame connected to each other, and the cold plate and the surrounding frame form an accommodation cavity. The battery module is arranged in the accommodation cavity. The reinforcing structure includes a first reinforcing member and a second reinforcing member. The first reinforcing member and the second reinforcing member are fixed to the side of the cold plate away from the battery module. The first reinforcing member and the second reinforcing member have a first overlapping area in the normal projection on a target plane. The target plane is perpendicular to the height direction of the battery module.

[0005] The energy storage device provided by the embodiments of the present application has the first reinforcing member and the second reinforcing member fixed to the side of the cold plate away from the battery module, and the first reinforcing member and the second reinforcing member at least partially overlap. The first reinforcing member and the second reinforcing member shorten the "stress span" of the cold plate. Under such a structural relationship, the reinforcing structure significantly improves the anti-deformation ability of the cold plate, so that the cold plate can withstand greater vertical load without deforming, thereby ensuring that the lower box body has sufficient sealing, load-bearing capacity, and installation stability.

[0006] According to some embodiments of the present application, the two ends of the first reinforcing member are fixed to the surrounding frame, and the second reinforcing member is fixed to the surface of the side of the cold plate away from the battery module. The first reinforcing member covers at least part of the second reinforcing member.

[0007] In the embodiments of the present application, the two ends of the first reinforcing member are fixed to the surrounding frame, so that the first reinforcing member is rigidly fixed to the surrounding frame. The first reinforcing member changes from an "independent support member" to a "rigid member cooperating with the surrounding frame". The bending resistance of the first reinforcing member is significantly improved, and the first reinforcing member can bear greater vertical load. The cold plate is less likely to deform.

[0008] According to some embodiments of the present application, the first reinforcing member is fastened with the second reinforcing member by a second fastening member.

[0009] In the embodiments of the present application, the two ends of the first reinforcing member are fixedly connected with the frame, and the other regions of the first reinforcing member are fastened with the second reinforcing member by the second fastening member, that is, the first reinforcing member is not only connected with the frame but also connected with the second reinforcing member, so that the central region of the first reinforcing member can be prevented from sagging, and the ability of the first reinforcing member to bear vertical load is improved. In addition, the second reinforcing member can not only improve the anti-deformation ability of the cold plate but also be connected with the first reinforcing member. Compared with the case where the second fastening member is directly connected with the cold plate, the thickness of the second reinforcing member can be designed to be greater than the thickness of the cold plate, so that the fastening force of the second fastening member is improved when the second fastening member is connected with the second reinforcing member.

[0010] According to some embodiments of the present application, the cold plate comprises a substrate and a flow channel portion, the flow channel portion is protruded on the side surface of the substrate away from the battery module, the second reinforcing member is fixedly arranged on the region of the substrate where the flow channel portion is not arranged, and the height of the second reinforcing member is greater than the height of the flow channel portion.

[0011] In the embodiments of the present application, the height of the second reinforcing member is greater than the height of the flow channel portion, and when the first reinforcing member is fastened with the second reinforcing portion by the second fastening member, the second reinforcing member directly contacts the first reinforcing member, so that the first reinforcing member can be prevented from damaging the flow channel portion. In addition, the second reinforcing member plays a role of fixedly connecting the first reinforcing member and dispersing the stress at the bottom of the cold plate.

[0012] According to some embodiments of the present application, the first reinforcing member is provided with a groove on the side thereof facing the cold plate, and at least part of the second reinforcing member is arranged in the groove.

[0013] In the embodiments of the present application, at least part of the second reinforcing member can be accommodated in the groove of the first reinforcing member, so that the first reinforcing member can be as closely attached to the side surface of the cold plate away from the battery module as possible, the contact area between the first reinforcing member and the cold plate is larger, and the stress is more uniform, so that the cold plate can be prevented from being damaged due to the stress between the first reinforcing member and the cold plate.

[0014] According to some embodiments of the present application, the bottom wall of the groove is fastened with the second reinforcing member by a second fastening member.

[0015] According to some embodiments of the present application, the first reinforcing member is provided with a first rib on the side thereof away from the cold plate and at a position corresponding to the groove in the height direction of the battery module; and the groove is recessed from the side surface of the first reinforcing member facing the cold plate and into the first rib along the height direction of the battery module.

[0016] According to some embodiments of the present application, the first reinforcing member is provided with a first rib on the side facing away from the cold plate.

[0017] In the embodiments of the present application, the first rib can improve the structural strength of the first reinforcing member, thereby improving the deformation resistance of the cold plate.

[0018] According to some embodiments of the present application, the second reinforcing member is arranged between the cold plate and the first rib, and the first rib is locked with the second reinforcing member by a second locking member.

[0019] In the embodiments of the present application, the second reinforcing member is arranged between the cold plate and the first rib, and the first rib is locked with the second reinforcing member by a second locking member.

[0020] According to some embodiments of the present application, the first reinforcing member is provided with a second rib on the side facing away from the cold plate, and the second rib and the first rib have a second overlapping area in the orthographic projection on the target plane.

[0021] In the embodiments of the present application, the first reinforcing member is provided with a second rib on the side facing away from the cold plate, and the second rib and the first rib have a second overlapping area in the orthographic projection on the target plane.

[0022] According to some embodiments of the present application, the first rib is locked with the second reinforcing member by a second locking member, and the second locking member has a force receiving portion.

[0023] The protruding height of the second rib is greater than the protruding height of the first rib, and the height difference between the second rib and the first rib forms an avoiding groove for avoiding the force receiving portion.

[0024] In the embodiments of the present application, after the first reinforcing member and the second reinforcing member are locked by the second locking member, the force receiving portion can be hidden in the avoiding groove and does not protrude from the top surface of the second rib. The design of the avoiding groove can ensure that the second rib can always be in contact with other components, thereby protecting and avoiding the force receiving portion of the second locking member, and avoiding the force receiving portion from being scratched and affecting the connection strength.

[0025] According to some embodiments of the present application, the first reinforcing member extends along the width direction of the battery module, and the second reinforcing member extends along the length direction of the battery module.

[0026] According to some embodiments of the present application, the side of the cold plate facing away from the battery module has a middle region and two edge regions arranged along the length direction of the battery module, and the middle region is connected between the two edge regions; the number of the first reinforcing members is multiple, and the multiple first reinforcing members are arranged along the second direction, and the density of the first reinforcing members arranged in the middle region is greater than the density of the first reinforcing members arranged in the edge regions.

[0027] In the embodiments of the present application, the density of the first reinforcing members arranged in the middle region of the cold plate is greater, which can improve the anti-deformation capability of the middle part of the cold plate and avoid serious deformation of the middle region of the cold plate.

[0028] According to some embodiments of the present application, the second reinforcing member is arranged between the first reinforcing member and the cold plate; in the height direction of the battery module, the positions corresponding to the first reinforcing member and the second reinforcing member, and the side surface of the first reinforcing member facing the second reinforcing member is a first surface, and the rest of the outer surface of the first reinforcing member except the first surface is a second surface; at least one of the first surface and the outer surface of the second reinforcing member is provided with a conductive layer, the first reinforcing member is electrically connected with the second reinforcing member through the conductive layer, and the second surface is provided with a corrosion-resistant layer.

[0029] In the embodiments of the present application, the first reinforcing member is electrically connected with the second reinforcing member through the conductive layer, so that the cold plate, the first reinforcing member, the second reinforcing member and the entire lower box body are in equipotential, on the one hand, since potential difference is prone to occur between the non-charged but possibly conductive components such as the lower box body and the first reinforcing member, and current conduction is prone to occur when a person touches, thereby causing electric shock accidents, the equipotential design can keep the cold plate, the first reinforcing member, the second reinforcing member and the lower box body at the same potential, thereby eliminating the risk of electric shock; on the other hand, the equipotential design can ground the current when the box body is electrified, so as to ensure that the battery pack box body and the grounding system are at the same potential, and avoid dangerous voltage when electrified. In addition, the rest of the surface of the first reinforcing member is provided with a corrosion-resistant layer, which can block or delay the corrosion of external moisture, oxygen and other corrosive media to the first reinforcing member, thereby prolonging the service life.

[0030] The power supply system of the embodiments of the present application comprises a power-using device and the energy storage device of any one of the above, and the energy storage device is used to supply power to the power-using device. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0032] Figure 1 is a schematic diagram of an energy storage system.

[0033] Figure 2 is a schematic diagram of a battery pack according to an embodiment of the application.

[0034] Figure 3 is a schematic diagram of a battery module, a lower case, and a first reinforcing member according to an embodiment of the application.

[0035] Figure 4 is a schematic diagram of a battery module, a lower case, and a first reinforcing member according to an embodiment of the application. Figure 3

[0036] Figure 5 Figure 3

[0037] Figure 6 is a schematic diagram of a first reinforcing member.

[0038] Figure 7 Figure 6

[0039] Figure 8

[0040] Figure 9

[0041] Figure 10 is a schematic diagram of a power supply system.

[0042] In the drawings:

[0043] 100, case; 110, upper cover; 120, lower case; 121, cold plate; 121a, middle region; 121b, edge region; 1211, base plate; 1212, flow passage portion; 122, side frame; 123, end frame; 124, surrounding frame; 125, accommodation cavity;

[0044] 200, battery module; 220, single battery;

[0045] 300, wire harness sampling assembly;

[0046] ​​​​​​​400, reinforcing structure; 400a, first reinforcing member; 400b, second reinforcing member; 402, avoiding groove; 403, first surface; 404, second surface; 405, conductive layer; 406, anticorrosive layer; 410, first rib; 420, second rib; 430, groove;

[0047] 610, first locking member; 620, second locking member; 621, stress receiving portion. DETAILED DESCRIPTION

[0048] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will be simplified or omitted.

[0049] It is to be understood that the terms "including", "comprising", "having" and variations thereof herein are intended to cover all possible combinations of the listed items with those items not specifically recited. For example, a process, method, system, article, or apparatus that includes a series of steps or units is not to be limited by the specific order of the steps or units, unless the context requires otherwise.

[0050] Since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate of energy, it is necessary to store one form of energy through a medium or device into the same or another form of energy, and release it in a specific energy form based on future application needs.

[0051] At present, the generation of green electricity generally depends on photovoltaic, wind power, water potential, etc., and wind energy and solar energy have the problems of strong intermittency and large fluctuation, which will cause the instability of power grid, not enough electricity at peak electricity, too much electricity at low electricity, and unstable voltage will also cause damage to electricity, therefore, due to insufficient electricity demand or insufficient grid accommodation capacity, the problem of "abandoning wind and light" may be caused, and energy storage is needed to solve these problems. That is, the electricity is stored in other forms of energy through physical or chemical means, and the energy is converted into electricity when needed, simply speaking, energy storage is similar to a large "power bank", which stores electricity when photovoltaic and wind energy are sufficient, and releases the electricity of energy storage when needed.

[0052] Taking electrochemical energy storage as an example, the scheme provides an energy storage device, which is applied to an energy storage system, and is internally provided with a group of chemical batteries, mainly using chemical elements in the batteries as energy storage medium. The charging and discharging process is accompanied by chemical reaction or change of the energy storage medium. In simple terms, the wind energy and solar energy generated are stored in the chemical batteries, and when the external power usage reaches the peak, the stored power is released for use, or transferred to places where power is in short supply for use.

[0053] At present, the energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage and power consumption side energy storage, and the corresponding types of energy storage devices include:

[0054] (1) Large-scale energy storage power station applied to wind power and photovoltaic power station side, which can assist renewable energy power generation to meet grid connection requirements and improve renewable energy utilization rate; the energy storage power station is used as a high-quality active / reactive power regulation power source in the power supply side, realizes load matching of electric energy in time and space, enhances renewable energy consumption capacity, reduces instantaneous power change, reduces impact on the power grid, improves new energy power generation consumption problem and has great significance in power grid system standby, relieving peak load power supply pressure and peak regulation;

[0055] (2) Energy storage container applied to the power grid side, the main functions of which are peak regulation, frequency regulation and peak regulation for relieving power grid congestion, which can realize peak clipping and valley filling of power consumption load, i.e. charging the energy storage battery when the power consumption load is low, and releasing the stored power when the power consumption load is high, so as to realize the balance between power production and consumption;

[0056] (3) Small energy storage cabinet applied to power consumption side, the main functions of which are power self-generation and self-use, peak-valley price difference arbitrage, capacity cost management and improvement of power supply reliability. According to different application scenarios, the power consumption side energy storage can be divided into industrial and commercial energy storage cabinet, household energy storage device and energy storage charging pile, etc., which is generally used with distributed photovoltaic power supply. Industrial and commercial users can use energy storage for peak-valley price difference arbitrage and capacity cost management. In the power market implementing peak-valley electricity price, the energy storage system is charged at low price and discharged at high price, so as to realize peak-valley price difference arbitrage and reduce power consumption cost. In addition, industrial enterprises applying two-part electricity price can use the energy storage system to store energy at low power consumption and discharge at high peak load, so as to reduce the maximum demand power and the maximum demand capacity, and achieve the purpose of reducing capacity cost. Household photovoltaic power supply with energy storage can improve the level of power self-generation and self-use. Due to high electricity price and poor power supply stability, the demand for household photovoltaic power supply is increased. Considering that photovoltaic power is generated during the day and the user's load is generally high at night, the configuration of energy storage can better utilize photovoltaic power and improve the level of self-generation and self-use, while reducing power consumption cost. In addition, communication base stations, data centers and other fields need to configure energy storage for standby power supply.

[0057] In some embodiments, please refer to Figure 1 , Figure 1 Figure 1 is a structural schematic diagram of an energy storage system according to an embodiment of the present application, and Figure 1 The energy storage device of the present application is not limited to the power generation / distribution side energy storage scenario.

[0058] The present application provides an energy storage system, which comprises a high-voltage cable 2, a first electric energy conversion device 3, a second electric energy conversion device 4, and an energy storage device 1 provided by the present application. In some embodiments of the power generation side scenario, the second electric energy conversion device 4 can be a wind power electric energy conversion device. Since the wind power electric energy conversion generates electric energy with fluctuation, randomness and intermittence, the unstable electric energy output by the wind power electric energy conversion device can be first stored in the energy storage device 1 through grid connection. The energy storage device 1 is connected with the high-voltage cable 2 and outputs smooth electric energy for power distribution side use, realizes peak shaving and frequency modulation, and realizes stable operation of the power grid. Alternatively, the wind power electric energy conversion device is always connected with the high-voltage cable 2. In ordinary power generation, the electric energy output by the wind power electric energy conversion device is supplied to the power distribution side through the high-voltage cable. When the current power load is low and the wind power electric energy conversion device generates excess power, the excess power is first stored in the energy storage device 1, the wind curtailment and light curtailment rates are reduced, and the new energy power generation consumption problem is improved. When the power load is high, the power grid issues an instruction, and the energy storage device 1 stores the electric energy together with the high-voltage cable 2 in a grid-connected mode to transmit electric energy to the power side for use, providing peak shaving, frequency modulation, backup and other services for power grid operation, fully playing the role of power grid peak shaving, promoting peak shaving and valley filling of the power grid, and relieving the power supply pressure of the power grid.

[0059] In some embodiments of the power distribution side, the first electric energy conversion device 3 can be a photovoltaic electric energy conversion device. The energy storage device 1 is connected with the high-voltage cable 2 and installed between the downstream of the high-voltage cable 2 and the user load. The electric energy output by the photovoltaic electric energy conversion device is stored in the energy storage device 1, which can be used as a backup power source in response to the failure of the power grid / power distribution network. Alternatively, when the high-voltage cable 2 transmission line is blocked, the energy storage device 1 can provide power supply support to relieve the line blockage and delay the economic pressure caused by the expansion of the power grid / power distribution.

[0060] Optionally, the first electric energy conversion device 3 can include but is not limited to a wind power electric energy conversion device, and the second electric energy conversion device 4 can include but is not limited to a photovoltaic electric energy conversion device. The first electric energy conversion device 3 and the second electric energy conversion device 4 can convert at least one of solar energy, light energy, wind energy, heat energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0061] Optionally, the energy storage device 1 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0062] Optionally, the energy storage device 1 may include, but is not limited to, battery packs, battery clusters, mobile power supplies, energy storage cabinets / containers, and other battery integrated systems. The actual application form of the energy storage device 1 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1.

[0063] like Figure 2 As shown, the energy storage device 1 is a battery pack, which includes a housing 100, a battery module 200, and a wiring harness sampling assembly 300. The housing 100 includes an upper cover 110 and a lower housing 120, which, when connected, form a cavity for accommodating the battery module 200 and the wiring harness sampling assembly 300. The battery module 200 is fixed within the lower housing 120, and the wiring harness sampling assembly 300 is located on one side of the battery module 200, used to collect the voltage and / or temperature of the individual cells 220 of the battery module 200.

[0064] In one embodiment, the battery module 200 and the wiring harness sampling assembly 300 are arranged along the height direction of the battery module 200, and the wiring harness sampling assembly 300 is located above the battery module 200 in the height direction.

[0065] It is understood that the number of battery modules 200 can be one or more, and the number of wiring harness sampling components 300 can be one or more. The number of battery modules 200 and the number of wiring harness sampling components 300 can be the same or different.

[0066] For example, there are four battery modules 200, which are arranged side by side along the width of the battery modules 200. There are also four wiring harness sampling assemblies 300, which are located on one side of each of the four battery modules 200.

[0067] Of course, in other embodiments, the number of wiring harness sampling components 300 may be less than the number of battery modules 200. For example, there may be two wiring harness sampling components 300 and four battery modules 200, with one wiring harness sampling component 300 corresponding to two battery modules 200.

[0068] In one embodiment, the harness sampling component 300 is a CCS (CellConnection System, integrated busbar).

[0069] Each battery module 200 includes multiple individual battery cells 220, which are arranged side by side. The multiple individual battery cells 220 can be connected in series, parallel, or a combination thereof; a combination of series and parallel connections is used. The wiring harness sampling component 300 is capable of collecting the voltage and / or temperature of each individual battery cell 220.

[0070] When there are multiple battery modules 200, the multiple battery modules 200 can also be connected in series, parallel or mixed.

[0071] Among them, the single cell 220 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0072] like Figure 3 As shown, the lower housing 120 includes a cold plate 121 and a frame 124. The frame 124 has openings at both ends. The cold plate 121 is fixedly connected to the frame 124 and covers one of the openings of the frame 124. The cold plate 121 and the frame 124 together form a receiving cavity 125, and the cold plate 121 serves as the bottom plate of the lower housing 120. The battery module 200 is installed into the receiving cavity 125 through the other opening of the frame 124 and is located on one side of the thickness direction of the cold plate 121.

[0073] As an example, the frame 124 includes two side frames 122 and two end frames 123. The side frames 122 extend along the length direction of the battery module 200, and the end frames 123 extend along the width direction of the battery module 200. The two side frames 122 are arranged opposite each other along the width direction of the battery module 200, and the two end frames 123 are arranged along the length direction of the battery module 200. The two side frames 122 and the two end frames 123 are connected end to end to form a rectangular frame.

[0074] In one embodiment, the cold plate 121 is fixedly connected to two side frames 122 on both sides along the width direction of the battery module 200, and the cold plate 121 is fixedly connected to two end frames 123 on both sides along the length direction of the battery module 200.

[0075] As an example, the cold plate 121 is bolted to the side frame 122 and the end frame 123.

[0076] The inventor of the present application found in research that after the cold plate 121 is designed in an integrated manner with the bottom plate of the lower box body 120, since the cold plate 121 is internally provided with a flow channel, the cold plate 121 is actually a hollow plate structure, which further leads to a low bearing capacity of the cold plate 121. Under the gravity of the battery module 200, the cold plate 121 is prone to sagging deformation. When the cold plate 121 is severely deformed or even damaged due to deformation, the sealing performance, bearing capacity and installation stability of the battery pack are all affected.

[0077] Based on this, as shown in Figure 3 The energy storage device 1 of the embodiment of the present application also includes a reinforcing structure 400, the reinforcing structure 400 includes a first reinforcing member 400a and a second reinforcing member 400b, the first reinforcing member 400a and the second reinforcing member 400b are both fixedly arranged on the side of the cold plate 121 away from the battery module 200, the first reinforcing member 400a and the second reinforcing member 400b have a first overlapping area in the orthographic projection on a target plane, and the target plane is perpendicular to the height direction of the battery module 200.

[0078] The energy storage device 1 of the embodiment of the present application, the side of the cold plate 121 away from the battery module 200 is fixedly provided with the first reinforcing member 400a and the second reinforcing member 400b, and the first reinforcing member 400a and the second reinforcing member 400b at least partially overlap, the first reinforcing member 400a and the second reinforcing member 400b shorten the “force span” of the cold plate 121. Under such a structural relationship, the reinforcing structure 400 significantly improves the anti-deformation capability of the cold plate 121, so that the cold plate 121 can withstand greater vertical load without deformation, thereby ensuring that the lower box body 120 has sufficient sealing performance, bearing capacity and installation stability.

[0079] As an example, the first reinforcing member 400a extends along a first direction D1, and the second reinforcing member 400b extends along a second direction D2. The first direction D1 and the second direction D2 can be the same direction or different directions.

[0080] For example, the first direction D1 is the width direction of the battery module 200, the second direction D2 is the length direction of the battery module 200, and the first direction D1 is perpendicular to the second direction D2. That is, the first reinforcing member 400a constitutes a transverse reinforcing member, the second reinforcing member 400b constitutes a longitudinal reinforcing member, and the first reinforcing member 400a and the second reinforcing member 400b are arranged in a longitudinal and transverse staggered manner. Of course, the first direction D1 and the second direction D2 can also be arranged at an angle.

[0081] In a variant, the first direction D1 can also not be the width direction of the battery module 200, and the second direction D2 can also not be the length direction of the battery module 200. For example, the first reinforcing member 400a and the second reinforcing member 400b respectively extend along two diagonal lines of the surrounding frame 124, i.e., the first direction D1 and the second direction D2 are respectively two diagonal directions of the surrounding frame 124, so that the first reinforcing member 400a and the second reinforcing member 400b are arranged in an "X" shape on the bottom surface of the cold plate 121. Of course, the first reinforcing member 400a and the second reinforcing member 400b can also extend in other directions, which will not be listed one by one here.

[0082] Next, taking the example that the first reinforcing member 400a extends in the width direction of the battery module 200, and the second reinforcing member 400b extends in the length direction of the battery module 200. In addition, for ease of description, the height direction of the battery module 200 is defined as the third direction D3, wherein the first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other.

[0083] In an embodiment, the first reinforcing member 400a and the second reinforcing member 400b are in a split structure. Of course, in a variant embodiment, the first reinforcing member 400a and the second reinforcing member 400b can also be in an integrated structure.

[0084] In an embodiment, the first reinforcing member 400a is in a flat plate structure, for example, a rectangular plate structure; and the second reinforcing member 400b is in an elongated component. Of course, in a variant embodiment, the first reinforcing member 400a and the second reinforcing member 400b can both be elongated components; or, the first reinforcing member 400a and the second reinforcing member 400b are both in a flat plate structure.

[0085] The number of the first reinforcing members 400a can be one or more, and when the number of the first reinforcing members 400a is more than one, the plurality of first reinforcing members 400a are arranged along the second direction D2. The number of the second reinforcing members 400b can be one or more.

[0086] When the number of the first reinforcing members 400a is more than one, and the number of the second reinforcing members 400b is one, each first reinforcing member 400a can form a cross point with the second reinforcing member 400b.

[0087] When the number of the first reinforcing members 400a is more than one, and the number of the second reinforcing members 400b is also more than one, the plurality of second reinforcing members 400b constitute a plurality of longitudinal reinforcing groups, the number of the longitudinal reinforcing groups is the same as the number of the first reinforcing members 400a, and each longitudinal reinforcing group includes at least one second reinforcing member 400b. When a longitudinal reinforcing group includes a plurality of second reinforcing members 400b, the plurality of second reinforcing members 400b of the longitudinal reinforcing group are arranged along the first direction D1.

[0088] In an embodiment, as shown in Figure 3 The reinforcing structure 400 includes 4 first reinforcing members 400a and 12 second reinforcing members 400b, the 12 second reinforcing members 400b are divided into 4 longitudinal reinforcing groups, each longitudinal reinforcing group corresponds to one of the 4 first reinforcing members 400a, and each longitudinal reinforcing group includes 3 second reinforcing members 400b arranged along the first direction D1, and each first reinforcing member 400a is arranged staggered with the corresponding 3 second reinforcing members 400b.

[0089] As shown in Figure 3 The side of the cold plate 121 facing away from the battery module 200 has an intermediate region 121a and two edge regions 121b arranged along the length direction (second direction D2) of the battery module, and the intermediate region 121a is connected between the two edge regions 121b. The number of first reinforcing members 400a is multiple, and the multiple first reinforcing members 400a are arranged along the second direction D2, and the density of the first reinforcing members 400a arranged in the intermediate region 121a is greater than the density of the first reinforcing members 400a arranged in the edge region 121b.

[0090] Because the size of the cold plate 121 along the second direction D2 is large, the cold plate 121 is prone to severe sagging deformation in the middle region. In the embodiment of the present application, more first reinforcing members 400a are arranged in the intermediate region of the cold plate 121, which can improve the anti-deformation ability of the middle region of the cold plate 121 and avoid severe deformation of the middle region of the cold plate 121.

[0091] As an example, the reinforcing structure 400 includes 4 first reinforcing members 400a, two of which are arranged in the intermediate region 121a of the cold plate 121, and the other two are arranged in the two edge regions 121b, respectively.

[0092] In a variant, at least one first reinforcing member 400a can be arranged in the intermediate region 121a, and no first reinforcing member 400a is arranged in each edge region 121b.

[0093] As shown in Figure 3 and Figure 4 The two ends of the first reinforcing member 400a in the length direction (first direction D1) are fixed to the surrounding frame 124, the second reinforcing member 400b is fixed to the surface of the cold plate 121 facing away from the battery module 200, and the first reinforcing member 400a covers at least part of the second reinforcing member 400b.

[0094] In the embodiment, the two ends of the first reinforcing member 400a are fixed to the frame 124, so that the first reinforcing member 400a is rigidly fixed to the frame 124, the first reinforcing member 400a changes from an "independent support" to a "rigid member cooperating with the frame 124", the bending resistance of the first reinforcing member 400a is significantly improved, the first reinforcing member 400a can bear greater vertical load, and the cold plate 121 is less likely to deform.

[0095] In an embodiment, the second reinforcing member 400b is connected to the side surface of the cold plate 121 away from the battery module 200 by welding.

[0096] Of course, in a variant, the first reinforcing member 400a can also be fixed to the cold plate 121, for example, the first reinforcing member 400a is welded to the side surface of the cold plate 121 away from the battery module 200.

[0097] As an example, the two ends of the first reinforcing member 400a along the first direction D1 are fastened to the frame 124 by the first fastening member 610.

[0098] In the embodiment, the first reinforcing member 400a and the frame 124 are connected by the first fastening member 610, the first fastening member 610 can apply stable pre-tightening force between the first reinforcing member 400a and the frame 124, so that the first reinforcing member 400a and the frame 124 are tightly connected, thereby ensuring the bearing capacity of the first reinforcing member 400a, and the pre-tightening force of the first fastening member 610 can be controlled by torque, so that the connection strength is controllable.

[0099] Further, when the first reinforcing member 400a is fixed to the frame 124, the two ends of the first reinforcing member 400a along the first direction D1 are connected to the two side frames 122 of the frame 124 by the first fastening member 610 respectively.

[0100] In an embodiment, the first reinforcing member 400a is fastened to the second reinforcing member 400b by the second fastening member 620.

[0101] In the embodiment of the present application, the two ends of the first reinforcing member 400a are fixedly connected to the surrounding frame 124, and the other regions of the first reinforcing member 400a are also locked to the second reinforcing member 400b through the second locking member 620, that is, the first reinforcing member 400a is not only connected to the surrounding frame 124, but also connected to the second reinforcing member 400b, so as to avoid the middle region of the first reinforcing member 400a from sagging, and improve the ability of the first reinforcing member 400a to bear vertical load. In addition, the second reinforcing member 400b can not only improve the anti-deformation ability of the cold plate 121, but also serve as a support seat for mounting and fixing the first reinforcing member 400a. Compared with the second locking member 620 being directly connected to the cold plate 121, the thickness of the second reinforcing member 400b can be designed to be greater than the thickness of the cold plate 121, so that when the second locking member 620 is connected to the second reinforcing member 400b, the locking force of the second locking member 620 is improved.

[0102] As shown in Figure 5 and Figure 6 , the side of the first reinforcing member 400a facing the cold plate 121 is provided with a groove 430, and at least part of the second reinforcing member 400b is arranged in the groove 430.

[0103] In the embodiment of the present application, at least part of the second reinforcing member 400b can be accommodated in the groove 430 of the first reinforcing member 400a, so that the first reinforcing member 400a can be as close as possible to the side surface of the cold plate 121 away from the battery module 200, the contact area between the first reinforcing member 400a and the cold plate 121 is larger, and the stress is more uniform, so as to avoid damage to the cold plate 121 due to stress between the first reinforcing member 400a and the cold plate 121.

[0104] Further, the bottom wall of the groove 430 is locked to the second reinforcing member 400b through the second locking member 620. When connected, the second locking member 620 is sequentially loaded into the bottom wall of the groove 430 and the second reinforcing member 400b from the side of the first reinforcing member 400a away from the battery module 200.

[0105] As shown in Figure 5 , in the height direction of the battery module 200, the position corresponding to the first reinforcing member 400a and the second reinforcing member 400b, and the side surface of the second reinforcing member 400b is a first surface 403, and the rest of the outer surface of the first reinforcing member 400a except the first surface 403 is a second surface 404; at least one of the outer surface of the first surface 403 and the second reinforcing member 400b is provided with a conductive layer 405, the first reinforcing member 400a is electrically connected to the second reinforcing member 400b through the conductive layer 405, and the second surface 404 is provided with a corrosion-resistant layer 406.

[0106] In this embodiment, the first reinforcing member 400a is electrically connected to the second reinforcing member 400b via a conductive layer 405, making the cold plate 121, the first reinforcing member 400a, the second reinforcing member 400b, and the entire lower housing 120 equipotential. On the one hand, since potential differences can easily occur between non-energized but potentially conductive components such as the lower housing 120 and the first reinforcing member 400a, contact with personnel may lead to current conduction and potentially electric shock. The equipotential design keeps the cold plate 121, the first reinforcing member 400a, the second reinforcing member 400b, and the lower housing 120 at the same potential, thereby eliminating the risk of electric shock. On the other hand, the equipotential design can ground and conduct current when the housing leaks, ensuring that the battery pack housing is at the same potential as the grounding system and preventing dangerous voltages from being generated during leakage. In addition, the remaining surfaces of the first reinforcing member 400a are provided with an anti-corrosion layer 406, which can block or delay the erosion of the first reinforcing member 400a by external corrosive media such as moisture and oxygen, extending its service life.

[0107] In one embodiment, at least one of the outer surfaces of the first surface 403 and the second reinforcing member 400b is provided with a conductive layer 405. This can be: the first surface 403 is provided with a conductive layer 405; or, the outer surface of the second reinforcing member 400b is provided with a conductive layer 405; or, both the first surface 403 and the outer surface of the second reinforcing member 400b are provided with a conductive layer 405.

[0108] It is understandable that the conductive layer 405 can be made of pure metal materials, carbon-based materials, or conductive polymer materials.

[0109] The conductive layer 405 can be attached to the substrate surface by means of electroplating, sputtering, spraying, etc., and this application does not limit it.

[0110] The anti-corrosion layer 406 can be made of metal or non-metal. When the anti-corrosion layer 406 is made of metal, it can be formed on the substrate surface by processes such as electroplating or spraying; when the anti-corrosion layer 406 is made of non-metal, it can be formed on the substrate surface by methods such as brushing or spraying.

[0111] As an example, when the first reinforcing member 400a is provided with a groove 430, the bottom surface of the groove 430 is the first surface 403.

[0112] like Figure 7 As shown, the first reinforcing member 400a has a first rib 410 protruding on the side facing away from the cold plate 121.

[0113] In the embodiments of this application, the first rib 410 can improve the structural strength of the first reinforcing member 400a, thereby improving the deformation resistance of the cold plate 121.

[0114] As an example, the first rib 410 can extend along the second direction D2. Of course, in other embodiments, the first rib 410 can also extend along other directions.

[0115] In an embodiment, the second reinforcing member 400b is arranged between the cold plate 121 and the first rib 410, and the first rib 410 is fastened to the second reinforcing member 400b by the second fastening member 620.

[0116] In the embodiments of the present application, the second reinforcing member 400b is arranged between the cold plate 121 and the first rib 410, so that the cold plate 121 and the first rib 410 are supported by force, and the connection strength between the cold plate 121 and the first reinforcing member 400a is strengthened, thereby avoiding the cold plate 121 from being deformed by extrusion when the energy storage device 1 vibrates.

[0117] Please continue to refer to Figure 7 The side of the first reinforcing member 400a away from the cold plate 121 further protrudes a second rib 420, and the orthographic projection of the second rib 420 on the target plane overlaps the first rib 410 in a second overlapping area.

[0118] In the embodiments of the present application, the side of the first reinforcing member 400a away from the cold plate 121 protrudes the intersecting first rib 410 and second rib 420, which further improves the structural strength of the first reinforcing member 400a, and further improves the anti-deformation ability of the cold plate 121.

[0119] In an embodiment, the number of first ribs 410 can be one or more, and the number of second ribs 420 can be one or more.

[0120] As an example, the second rib 420 extends along the first direction D1; of course, in other embodiments, the second rib 420 can also extend along other directions.

[0121] In the embodiments of the present application, the first rib 410 extends along the second direction D2, and the second rib 420 extends along the first direction D1. The first rib 410 and the second rib 420 are arranged in a longitudinal and transverse intersecting manner. The first rib 410 shortens the “force span” of the first reinforcing member 400a along the first direction D1, and the second rib 420 shortens the “force span” of the first reinforcing member 400a along the second direction D2. Under the joint action of the first rib 410 and the second rib 420, the anti-deformation ability of the first reinforcing member 400a is significantly improved, and the ability of the cold plate 121 to withstand vertical load is improved.

[0122] As Figure 6 and Figure 7As shown, the groove 430 on the first reinforcing member 400a corresponds to the position of the first rib 410 in the third direction D3. The groove 430 is recessed into the first rib 410 from the surface of the first reinforcing member 400a facing the cold plate 121 and along the third direction D3.

[0123] In the embodiments of this application, the groove 430 corresponds to the position of the first rib 410. When the first reinforcing member 400a is a plate-shaped structure, the thickness of the first reinforcing member 400a does not need to be designed to be very large. While satisfying the requirement to improve the deformation resistance of the cold plate 121, it can also save costs.

[0124] The inventors of this application discovered in their research that when the first reinforcing member 400a is a plate-shaped structure, its thickness is relatively thin. When the second locking member 620 locks the first reinforcing member 400a and the second reinforcing member 400b together, the force-bearing part 621 of the second locking member 620 will protrude from the surface of the first reinforcing member 400a facing away from the cold plate 121. This will cause the force-bearing part 621 of the second locking member 620 to easily rub against other components, thus affecting the locking strength.

[0125] Therefore, in order to solve the above problems, such as 7 and Figure 8 As shown, the second locking member 620 has a force-bearing part 621, and the protrusion height of the second rib 420 is greater than the protrusion height of the first rib 410. The height difference between the second rib 420 and the first rib 410 forms a relief groove 402 for avoiding the force-bearing part 621.

[0126] In this embodiment of the application, after the second locking member 620 locks the first reinforcing member 400a and the second reinforcing member 400b, the force-bearing part 621 can be hidden in the relief groove 402 and does not protrude from the top surface of the second rib 420. The design of the relief groove 402 can ensure that the second rib 420 can always contact other components, thereby protecting and avoiding the force-bearing part 621 of the second locking member 620, and thus preventing the force-bearing part 621 from being scratched and affecting the connection strength.

[0127] As an example, the second locking element 620 is a bolt, and the head of the bolt is the force-bearing part 621.

[0128] like Figure 9 As shown, the cold plate 121 includes a substrate 1211 and a flow channel 1212. The flow channel 1212 protrudes from the side surface of the substrate 1211 facing away from the battery module 200. The second reinforcing member 400b is fixed in the area of ​​the substrate 1211 where the flow channel 1212 is not provided. The height of the second reinforcing member 400b is greater than the height of the flow channel 1212.

[0129] In the embodiments of the present application, the height of the second reinforcing member 400b is greater than the height of the flow channel portion 1212. When the first reinforcing member 400a and the second reinforcing portion are locked by the second locking member 620, the second reinforcing member 400b directly contacts the first reinforcing member 400a, avoiding damage to the flow channel portion 1212 by the first reinforcing member 400a. In addition, the second reinforcing member 400b plays a role in fixing and connecting the first reinforcing member 400a, and dispersing the stress at the bottom of the cold plate 121.

[0130] As shown in Figure 10 Another aspect of the present application also provides a power supply system 6, comprising an electrical device 5 and the energy storage device 1 of any of the above embodiments. The energy storage device 1 is electrically connected to the electrical device 5, and the energy storage device 1 is used to supply power to the electrical device 5.

[0131] It can be understood that the various embodiments / embodiments provided by the present application can be combined with each other without contradiction, and will not be repeated here.

[0132] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0133] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the embodiments of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the application.

[0134] In the description of the present application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the application. In the present application, the illustrative description 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.

[0135] The above merely provides preferred embodiments of the application, and is not intended to limit the application. The application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall fall within the protection scope of the application.

Claims

1. An energy storage device, characterized by, The application relates to a battery pack, comprising: a lower box body, comprising a cold plate and a surrounding frame connected to each other, the cold plate and the surrounding frame forming a containing cavity; a battery module arranged in the containing cavity; and a reinforcing structure, comprising a first reinforcing member and a second reinforcing member, the first reinforcing member and the second reinforcing member being fixed to a side of the cold plate away from the battery module; the first reinforcing member and the second reinforcing member have a first overlapping area in a normal projection on a target plane, the target plane being perpendicular to the height direction of the battery module. Two ends of the first reinforcing member in the length direction are respectively fixed to the surrounding frame, the second reinforcing member is fixed to a side surface of the cold plate away from the battery module, and the first reinforcing member covers at least part of the second reinforcing member.

2. The energy storage device of claim 1, wherein, The first reinforcing member is locked to the second reinforcing member through a second locking member.

3. The energy storage device of claim 2, wherein, The cold plate comprises a base plate and a flow channel part, the flow channel part being protruded to a side surface of the base plate away from the battery module, the second reinforcing member being fixed to a region of the base plate where the flow channel part is not arranged, and the height of the second reinforcing member being greater than the height of the flow channel part.

4. The energy storage device of claim 3, wherein, A groove is arranged on a side of the first reinforcing member facing the cold plate, and at least part of the second reinforcing member is arranged in the groove.

5. The energy storage device of claim 2, wherein, The bottom wall of the groove is locked to the second reinforcing member through a second locking member.

6. The energy storage device of claim 5, wherein, A first rib is protruded to a side of the first reinforcing member away from the cold plate and corresponding to the groove in the height direction of the battery module.

7. The energy storage device of claim 5, wherein, The groove is recessed into the first rib from a side surface of the first reinforcing member facing the cold plate and in the height direction of the battery module. A first rib is protruded to a side of the first reinforcing member away from the cold plate.

8. The energy storage device of claim 1, wherein, The second reinforcing member is arranged between the cold plate and the first rib, and the first rib is locked to the second reinforcing member through a second locking member.

9. The energy storage device of claim 8, wherein, A second rib is further protruded to a side of the first reinforcing member away from the cold plate, and the second rib has a second overlapping area in a normal projection on the target plane with the first rib.

10. The energy storage device of claim 8, wherein, The first rib is locked to the second reinforcing member through a second locking member, and the second locking member has a force receiving part.

11. The energy storage device of claim 10, wherein, The protruding height of the second rib is greater than the protruding height of the first rib, and the height difference between the second rib and the first rib forms an avoiding groove for avoiding the force receiving part. The first reinforcing member extends in the width direction of the battery module, and the second reinforcing member extends in the length direction of the battery module.

12. The energy storage device of claim 1, wherein, A side of the cold plate away from the battery module has a middle region and two edge regions arranged in the length direction of the battery module, and the middle region is connected between the two edge regions.

13. The energy storage device of claim 12, wherein, The number of the first reinforcing members is plural, the plural first reinforcing members are arranged in the length direction of the battery module, and the density of the first reinforcing members arranged in the middle region is greater than the density of the first reinforcing members arranged in the edge regions. The second reinforcing member is arranged between the first reinforcing member and the cold plate.

14. The energy storage device of claim 1, wherein, ​ In the height direction of the battery module, the position corresponding to the first reinforcing member and the second reinforcing member, and the side surface of the second reinforcing member is a first surface, and the rest of the outer surface of the first reinforcing member except the first surface is a second surface; At least one of the first surface and the outer surface of the second reinforcing member is provided with a conductive layer, the first reinforcing member is electrically connected to the second reinforcing member through the conductive layer, and the second surface is provided with a corrosion-resistant layer.

15. A power supply system characterized by comprising: The energy storage device of any one of claims 1-14 is used to power the electric device.

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