Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system, and relates to the technical field of energy storage. The battery pack comprises a battery box body, a plurality of battery modules, a first support, a second support and a third support, a battery bin is formed in the battery box body, the battery modules are located in the battery bin, and each battery module comprises a plurality of single batteries arranged in the first direction; wherein in the first direction, a support is arranged between every two adjacent battery modules and at least one of one end of each battery module and the other end of each battery module, a plurality of energy absorption grooves are formed in each support, and crushing guide grooves are formed in the groove walls of at least part of the energy absorption grooves, so that the buffering and vibration reduction performance of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of energy storage, in particular to a battery pack and an energy storage system. BACKGROUND

[0002] A battery pack usually includes a plurality of battery modules. During transportation or use, the battery modules are prone to damage due to mechanical effects such as vibration, falling, collision, extrusion, expansion, etc., resulting in liquid leakage, short circuit, thermal runaway, and even fire and explosion of the battery modules, which poses a great safety risk. Therefore, it is necessary to improve the buffering and damping performance of the battery pack.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] The purpose of the present disclosure is to provide a battery pack and an energy storage system.

[0005] According to one aspect of the present disclosure, a battery pack is provided, comprising:

[0006] a battery box body, the battery box body being formed with a battery compartment;

[0007] a plurality of battery modules, the plurality of battery modules being located in the battery compartment, each of the battery modules comprising a plurality of battery cells arranged along a first direction;

[0008] wherein, along the first direction, at least one of between two adjacent battery modules, one end of the plurality of battery modules and the other end of the plurality of battery modules is provided with a support, and the support is provided with a plurality of energy absorption grooves on the upper portion, and at least part of the groove walls of the energy absorption grooves are provided with crush guide grooves.

[0009] In an exemplary embodiment of the present disclosure, at least part of the crush guide grooves penetrate the groove walls of the energy absorption grooves.

[0010] In an exemplary embodiment of the present disclosure, at least part of the crush guide grooves are located at the connection positions of the two intersecting groove walls in the energy absorption grooves.

[0011] In an exemplary embodiment of the present disclosure, at least part of the two adjacent energy absorption grooves are communicated by the crush guide grooves.

[0012] In an exemplary embodiment of the present disclosure, at least part of the crush guide grooves that communicate the two adjacent energy absorption grooves are located at the connection positions of the two intersecting groove walls in the crush guide grooves.

[0013] In an example embodiment of the present disclosure, at least part of the energy absorption grooves are through-hole structures extending in the first direction.

[0014] In an example embodiment of the present disclosure, the plurality of energy absorption grooves are distributed along a second direction and a third direction, and the crush guide groove is located at a middle position of the energy absorption grooves along the first direction; the first direction is the thickness direction of the battery monomer, the second direction is the width direction of the battery monomer, and the third direction is the height direction of the battery monomer.

[0015] In an example embodiment of the present disclosure, a plurality of strip-shaped grooves are arranged on the surface of at least part of the energy absorption grooves, the extension direction of the strip-shaped grooves intersects the first direction, and at least part of the strip-shaped grooves extend to the surface of the plurality of energy absorption grooves.

[0016] In an example embodiment of the present disclosure, at least part of the crush guide grooves are located at the groove bottom of the strip-shaped grooves and extend through the groove wall of the energy absorption grooves.

[0017] In an example embodiment of the present disclosure, along the first direction, a first support is arranged between two adjacent battery modules, a second support is arranged at one end of the plurality of battery modules, and a third support is arranged at the other end of the plurality of battery modules; at least any two of the first support, the second support, and the third support have the same structure and / or the energy absorption grooves have the same structure.

[0018] In an example embodiment of the present disclosure, along the first direction, a first support is arranged between two adjacent battery modules, a second support is arranged at one end of the plurality of battery modules, and a third support is arranged at the other end of the plurality of battery modules; the battery pack further comprises a first panel and a second panel, the second support is arranged between the first panel and the battery module adjacent to the first panel, and the third support is arranged between the second panel and the battery module adjacent to the second panel.

[0019] In an example embodiment of the present disclosure, the first support is bonded to the adjacent battery module, and / or the second support is bonded to the adjacent battery module and the first panel, and / or the third support is bonded to the adjacent battery module and the second panel.

[0020] In an example embodiment of the present disclosure, a positioning structure is arranged between the support and the adjacent battery module.

[0021] In an example embodiment of the present disclosure, the battery box comprises a lower box and a box cover, the lower box and the box cover form the battery compartment, and the support is connected to the lower box.

[0022] In an example embodiment of the present disclosure, a ratio of a width of the support in the second direction to a sum of widths of all the battery modules in the second direction is 0.8-1.2; the first direction is a thickness direction of the battery monomer, and the second direction is a width direction of the battery monomer; and / or,

[0023] A ratio of a height of the support in the third direction to a height of the battery module is 0.8-1.1; the first direction is a thickness direction of the battery monomer, and the third direction is a height direction of the battery monomer.

[0024] According to another aspect of the present disclosure, a power storage system is also provided, which includes the battery pack of any of the above embodiments.

[0025] The battery pack provided by the present disclosure can fix the battery module through the support, increase the horizontal constraint of the battery module, improve the overall rigidity of the battery pack, and reduce the risk of vibration failure of the battery module. In addition, when the battery pack falls, collides, is extruded, or expands during transportation or use, the energy absorption grooves can be deformed and absorb energy in time through the crushing guide grooves on the groove walls of at least some of the energy absorption grooves, thereby absorbing the displacement or deformation of the battery module caused by falling, collision, extrusion, expansion, etc., improving the buffering and damping performance between the battery modules, and improving the buffering and damping performance of the battery pack, thereby reducing the thermal runaway caused by resonance or falling, collision, etc. of the battery pack, and improving the safety of the battery pack.

[0026] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 A schematic diagram of a power storage system according to an embodiment of the present disclosure.

[0029] Figure 2 A schematic diagram of a battery pack according to an embodiment of the present disclosure.

[0030] Figure 3 A schematic diagram of opening the box cover of the battery pack is provided for an embodiment of the present disclosure.

[0031] Figure 4 A schematic diagram of the lower box body and the first support, the second support and the third support is provided for an embodiment of the present disclosure.

[0032] Figure 5 A side view of the first support is provided for an embodiment of the present disclosure.

[0033] Figure 6 A front view of the first support is provided for an embodiment of the present disclosure.

[0034] Figure 7 A side view of the second support is provided for an embodiment of the present disclosure.

[0035] Figure 8 A front view of the second support is provided for an embodiment of the present disclosure.

[0036] Figure 9 A front side view of the second support is provided for another embodiment of the present disclosure.

[0037] Figure 10 A rear side view of the second support is provided for another embodiment of the present disclosure.

[0038] Figure 11 A side view of the third support is provided for an embodiment of the present disclosure.

[0039] Figure 12 A front view of the third support is provided for an embodiment of the present disclosure.

[0040] 10, energy storage device; 20, power grid; 30, first electric energy conversion device; 40, second electric energy conversion device;

[0041] 100, battery pack;

[0042] 110, battery box body; 111, lower box body; 112, box cover; 113, first panel; 114, second panel; 115, bottom plate;

[0043] 120, battery module; 121, battery cell; 122, end plate;

[0044] 131, first support; 132, second support; 133, third support; 134, energy absorption groove; 135, crushing guide groove; 136, strip-shaped groove. DETAILED DESCRIPTION

[0045] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any number of ways, and example implementations should not be construed as limited to only those described herein; rather, embodiments should be construed more broadly. Identical reference numerals may

[0046] Since the energy required by people has strong time and space, in order to reasonably use energy and improve utilization, it is necessary to store one form of energy in the same form of energy or convert it into another form of energy through a medium or device, and then release it in a specific energy form based on future application.

[0047] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage of green power grid to be unstable (not enough electricity at peak electricity consumption, and too much electricity at low electricity consumption), and unstable voltage will 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.

[0048] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is converted into other forms of energy through physical or chemical means for storage, and when needed, the energy stored in the energy storage device is converted into electrical energy for release. Simply put, the energy storage device is similar to a large "power bank", which stores electrical energy when light energy and wind energy are sufficient, and releases the stored electrical energy when needed.

[0049] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0050] (1) Large-scale energy storage power stations applied in wind power, photovoltaic power stations and other power generation side energy storage scenarios, which can assist renewable energy power generation to meet grid connection requirements and improve renewable energy utilization rate; energy storage power stations as high-quality active / reactive power regulation power sources in power supply side, realize load matching of electrical energy in time and space, enhance renewable energy consumption capacity, reduce instantaneous power change, reduce impact on power grid, improve new energy power generation consumption problem, and have great significance in power grid system standby, relieving peak load power supply pressure and peak regulation.

[0051] (2) Large energy storage container applied in grid side energy storage scenario, the main functions are peak shaving, frequency modulation, and relieving grid congestion peak shaving, which can realize peak load shaving, i.e. charging the energy storage battery when the power load is low, and releasing the stored power when the power load is high, so as to balance the power production and consumption, such as energy storage power station system;

[0052] (3) Small and medium-sized energy storage cabinet applied in industrial and commercial energy storage scenario (bank, shopping mall, etc.) and small household energy storage box applied in household energy storage scenario, the main functions are power self-generation and self-use, peak load shaving, capacity cost management, and improving power supply reliability. According to different application scenarios, the power side energy storage can be divided into industrial and commercial energy storage cabinet, household energy storage device, and energy storage charging pile, which is generally used with distributed photovoltaic. Because there is a large price difference between the peak and valley positions of the electricity demand, after the user has an energy storage device, in order to reduce the cost, the energy storage device (energy storage cabinet / box) is usually charged during the low electricity price period; and the electricity in the energy storage device is released for use during the high electricity price period, so as to save the electricity cost. In addition, communication base stations, data centers and other fields need to be equipped with energy storage for backup power. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to the user providing backup power for himself and the grid, which eliminates the inconvenience caused by frequent power outages due to disasters or other reasons.

[0053] Figure 1 The schematic diagram of the energy storage system provided for an embodiment of the present disclosure, and the present disclosure Figure 1 The embodiment takes the power generation / distribution side shared energy storage scenario as an example for illustration, and the energy storage system of the present disclosure is not limited to the power generation / distribution side energy storage scenario, but can also be applied to industrial and commercial side or user side scenarios.

[0054] As Figure 1 shown, the energy storage system includes an energy storage device 10, a power grid 20, a first electric energy conversion device 30, and a second electric energy conversion device 40. In the power generation case, the first electric energy conversion device 30 and the second electric energy conversion device 40 are used to convert other forms of energy into electric energy, which is connected with the power grid 20 for use in the power consumption side. When the power consumption load is low, the first electric energy conversion device 30 and the second electric energy conversion device 40 generate excess power, which is stored in the energy storage device 10, reducing the wind and light abandonment rate and improving the new energy power generation consumption problem. When the power consumption load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 10 in the grid-connected mode together with the power grid 20 to supply the power consumption side, providing peak shaving, frequency modulation, backup and other services for the power grid 20 operation, fully playing the role of peak shaving of the power grid 20, promoting the peak load shaving of the power grid 20, and relieving the power supply pressure of the power grid 20.

[0055] The first electric energy conversion device 30 can be a solar energy conversion device, and the second electric energy conversion device 40 can be a wind energy conversion device. Of course, the electric energy conversion device can also be a device for converting at least one of thermal energy, tidal energy, biomass energy, and mechanical energy into electric energy.

[0056] In combination with the above-mentioned energy storage by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 10 includes at least one chemical battery, which uses chemical elements in the chemical battery as an energy storage medium to realize the charging and discharging process through chemical reactions or changes 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 chemical reactions or changes of the energy storage medium. When the use of external electric energy reaches a peak, the electric quantity stored in the at least one group of chemical batteries is released and used through chemical reactions or changes of the energy storage medium, or is transferred to a place where electric quantity is in short supply for use.

[0057] The energy storage device 10 can be a battery pack including battery monomers, an energy storage box, an energy storage cabinet, etc. The battery monomers can be lithium ion secondary batteries, lithium-sulfur batteries, sodium-lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., and the battery monomers can be in the form of a cylinder, a flat body, a cuboid, etc., which are not limited in the embodiments of the present disclosure.

[0058] As shown in Figure 2 and Figure 3 Taking the energy storage device 10 as a battery pack 100 as an example, the battery pack 100 includes a battery box body 110 and a plurality of battery modules 120. The battery box body 110 includes a lower box body 111 and a box cover 112, and the box cover 112 is fixedly / detachably connected with the lower box body 111 to enclose a battery compartment. The plurality of battery modules 120 are located in the battery compartment.

[0059] The battery modules 120 accommodated in the battery compartment of the battery box body 110 can be at least one, such as one, two, four, five, six, seven, eight or more. The more the number of battery modules 120, the higher the capacity of the battery pack 100, and thus the market demand can be more easily met. For example, as shown in Figure 3 The battery compartment of the battery box body 110 accommodates two rows along the length direction of the battery box body 110 and four columns along the width direction of the battery box body 110, totaling eight battery modules 120.

[0060] Each battery module 120 can include a pair of end plates 122 arranged opposite to each other along the arrangement direction of the battery cells, and a plurality of battery cells 121 arranged between the pair of end plates 122. The plurality of battery cells 121 and the pair of end plates 122 can be fixed by a binding tool such as a cable tie. The plurality of battery cells 121 are arranged along the length direction of the battery box, and the plurality of battery cells 121 are connected by cell connecting pieces to realize series / parallel connection among the plurality of battery cells 121.

[0061] The plurality of battery cells 121 are connected in series one by one, and each cell connecting piece is connected to electrode terminals of different polarities on two battery cells 121. Alternatively, two battery cells 121 are connected in parallel to form a group, and the groups are connected in series. In this case, each cell connecting piece is connected to electrode terminals of the same polarity on two battery cells 121, and then connected to electrode terminals of opposite polarity on other two battery cells 121.

[0062] Currently, the protection of the battery pack mainly includes three aspects. Firstly, the strength of the battery box, end plate and other structures and materials are adjusted to enhance the overall strength of the battery module, so as to achieve the purpose of impact resistance and vibration resistance. Secondly, protective components are added to prevent short circuit of the battery pack and delay the spread of thermal runaway, such as wrapping the end plate and copper bar with insulating materials, and arranging fireproof and heat insulation materials between the battery modules and the battery modules, and between the battery modules and the box cover. Thirdly, after thermal runaway occurs, fire extinguishing devices such as spraying fire extinguishing agents or various solutions into the battery pack are used to prevent the spread of thermal runaway.

[0063] However, increasing the strength of the battery box, end plate and other structures or materials to protect the battery pack is difficult to play a buffering role in actual impact, and instead, it is easy to cause damage to the aluminum shell of the battery cell during contact with the weak structure. At the same time, the other two protection methods have complex manufacturing process and high cost, and can only delay the spread of thermal runaway of the battery pack, but cannot reduce the probability of thermal runaway of the battery pack from the source. If the subsequent treatment is not timely, the battery pack may still catch fire or even explode.

[0064] To this end, an embodiment of the present disclosure provides a battery pack, as shown in Figures 2-4As shown, the battery pack 100 includes a battery box 110, a plurality of battery modules 120 and a support, the battery box 110 is formed with a battery compartment, the plurality of battery modules 120 are located in the battery compartment, each battery module 120 includes a plurality of battery monomers 121 arranged along a first direction X; along the first direction X, at least one of between the two adjacent battery modules 120, one end of the plurality of battery modules 120 and the other end of the plurality of battery modules 120 is provided with a support, and a plurality of energy absorption grooves 134 are provided on the support, and a crushing guide groove 135 is provided on the groove wall of at least part of the energy absorption grooves 134.

[0065] The battery pack 100 provided by the present disclosure can generally require a larger displacement or deformation amount in the stacking direction of the battery monomer 121 when vibration, falling, collision, extrusion, expansion and other phenomena occur during transportation or use, that is, the battery module 120 needs to absorb a larger displacement or deformation amount in the first direction X; by providing a support at at least one of between the two adjacent battery modules 120, one end of the plurality of battery modules 120 and the other end of the plurality of battery modules 120, on the one hand, the support can fix the battery module 120, increase the horizontal constraint of the battery module 120, improve the overall stiffness of the battery pack 100, and play a role in reducing vibration, reducing the risk of vibration failure of the battery module 120; on the other hand, since the support is provided with a plurality of energy absorption grooves 134, and the crushing guide groove 135 is provided on the groove wall of at least part of the energy absorption grooves 134, when the battery pack 100 falls, collides, extrudes, expands and other phenomena occur during transportation or use, the crushing guide groove 135 can guide the timely deformation and energy absorption of the energy absorption groove 134, and absorb the displacement or deformation of the battery module 120 caused by falling, collision, extrusion, expansion and other phenomena, to improve the buffering and shock absorbing performance between the battery modules 120, thereby improving the buffering and shock absorbing performance of the battery pack 100, reducing thermal runaway caused by resonance or falling, collision and other accidents of the battery pack from the source, and improving the safety of the battery pack 100.

[0066] As shown in Figure 3 and Figure 4 As shown, a first support 131 can be provided between the two adjacent battery modules 120 along the first direction X, a second support 132 can be provided at one end of the plurality of battery modules 120, and a third support 133 can be provided at the other end of the plurality of battery modules 120, and the battery pack 100 is provided with at least one of the first support 131, the second support 132 and the third support 133.

[0067] Next, the first support 131, the second support 132 and the third support 133 provided by the present disclosure will be described in detail.

[0068] As shown in Figure 5As shown, the first support 131 is provided with energy absorption grooves 134, and the openings of the energy absorption grooves 134 face the first direction X. By providing a plurality of energy absorption grooves 134, when the battery pack 100 is subjected to vibration, falling, collision, extrusion, swelling and other phenomena during transportation or use, the plurality of energy absorption grooves 134 on the first support 131 can deform and absorb energy, thereby protecting the integrity of the battery cell structure in the battery module 120 and reducing the risk of battery cell leakage, fire and explosion.

[0069] As shown in Figure 5 and Figure 6 At least part of the energy absorption grooves 134 is a through-hole structure extending along the first direction X. By forming the energy absorption grooves 134 as through-hole structures, when the energy absorption grooves 134 deform and absorb energy, the groove walls of the energy absorption grooves 134 can deform towards the accommodation space formed by the through-hole structure, which is conducive to the deformation of the energy absorption grooves 134 and can improve the deformation and energy absorption capacity of the energy absorption grooves 134. It can be understood that the plurality of energy absorption grooves 134 can all be through-hole structures, or some can be through-hole structures.

[0070] As shown in Figure 5 and Figure 6 The plurality of energy absorption grooves 134 are distributed along the second direction Y and the third direction Z on the first support 131, the first direction X is the thickness direction of the battery monomer 121, the second direction Y is the width direction of the battery monomer 121, and the third direction Z is the height direction of the battery monomer 121. By distributing the plurality of energy absorption grooves 134 along the second direction Y and the third direction Z, the extrusion force received by the energy absorption grooves 134 can be as evenly distributed as possible, so that the energy absorption grooves 134 on each part of the first support 131 can deform and absorb energy at the same time. Of course, the plurality of energy absorption grooves 134 can also be arrayed or irregularly distributed.

[0071] As shown in Figure 5 and Figure 6 The plurality of energy absorption grooves 134 are rectangular, i.e. the first support 131 can have a frame structure, so that the mass of the first support 131 can be relatively light. The size of the plurality of energy absorption grooves 134 can be different, and is specifically set according to the structural space between the two adjacent battery modules 120. Of course, the energy absorption grooves 134 can also be triangular, pentagonal, hexagonal or irregular in shape, and the shapes and sizes of the plurality of energy absorption grooves 134 can be different, as long as the energy absorption effect can be achieved, and the present disclosure does not limit this.

[0072] As shown in Figure 5 and Figure 6 The first support 131 can have a "mountain" structure. When the first support 131 is connected to the bottom plate 115 of the lower box body 111, it can be connected by bolts, clamps, rivets, welding, adhesion and the like. The first support 131 in the "mountain" structure can be fixedly connected or detachably connected to the bottom plate 115 of the lower box body 111 by three legs.

[0073] As shown in Figure 5 , at least part of the groove wall of the energy absorption groove 134 is formed with a crushing guide groove 135. By forming the crushing guide groove 135 on the groove wall of the energy absorption groove 134, it is beneficial to guide the energy absorption groove 134 to deform in time after the first support 131 is crushed and deformed after being crushed. The crushing guide groove 135 can be a shallow groove structure or a through-hole structure formed on the groove wall of the energy absorption groove 134, so that the structural strength of the energy absorption groove 134 at this position is significantly reduced, and when the energy absorption groove 134 is subjected to external force, the energy absorption groove 134 can be crushed and deformed at the position where the crushing guide groove 135 is arranged.

[0074] As shown in Figure 5 , the crushing guide groove 135 can be located at the connection position of the two intersecting groove walls in the energy absorption groove 134, which can improve the deformation energy absorption performance of the two intersecting groove walls in the energy absorption groove 134. The crushing guide groove 135 can be formed in each energy absorption groove 134. When the energy absorption groove 134 is rectangular, the energy absorption groove 134 has four corners, and the crushing guide groove 135 is arranged at each corner to improve the deformation energy absorption performance of each energy absorption groove 134.

[0075] As shown in Figure 5 , the crushing guide groove 135 is a through-hole structure, and the crushing guide grooves 135 arranged on the adjacent corners of the adjacent two energy absorption grooves 134 can be connected, thereby further improving the deformation energy absorption performance of the two intersecting groove walls in the energy absorption groove 134. The crushing guide groove 135 can also be located on the groove wall at any position of the energy absorption groove 134.

[0076] As shown in Figure 5 , the crushing guide groove 135 can be located at the middle position of the groove wall along the first direction X, that is, after the first support 131 is crushed, the energy absorption groove 134 at the middle position of the first direction X can be easily deformed and crushed to absorb energy, thereby improving the deformation energy absorption performance of the energy absorption structure.

[0077] The plurality of crushing guide grooves 135 can be distributed along the second direction Y and the third direction Z on the first support 131, that is, the plurality of crushing guide grooves 135 can be distributed on the same preset plane, for example, located on the plane perpendicular to the first direction X, which is beneficial to the deformation and crushing of each energy absorption groove 134.

[0078] The first support 131 can be formed of an insulating material. The positive and negative copper bars and wires between adjacent battery modules 120 can be arranged in different energy absorption grooves 134 of the through-hole structure of the first support 131, and the insulating material can be used to form an insulating gap between the positive and negative copper bars and wires, thereby reducing the risk of short circuit of the battery pack 100 when falling.

[0079] When the first support 131 and the battery module 120 are assembled into the battery compartment, the first support 131 can be bonded to the adjacent battery module 120, improving the stability after connection and avoiding misalignment between the two.

[0080] When the first support 131 and the battery module 120 are assembled into the battery compartment, a positioning structure can be provided between the first support 131 and the adjacent battery module 120 to form assembly positioning and avoid misalignment between the two. At the same time, when the battery pack 100 is subjected to vibration, falling, collision, extrusion, expansion, etc. during transportation or use, the positioning structure can prevent the first support 131 from misaligning in the second direction Y and the third direction Z, thereby ensuring the deformation energy absorption performance of the first support 131 on the adjacent two battery modules 120.

[0081] When the first support 131 is assembled into the battery compartment, the first support 131 can be detachably connected to the lower box body 111, and the position of the lower box body 111 along the first direction X can be adjusted to overcome the tolerances of the lower box body 111 and the battery module 120 during production and assembly, so that the first support 131 can be installed in the appropriate position to provide better deformation energy absorption performance.

[0082] The ratio of the width of the first support 131 in the second direction Y to the sum of the widths of all battery modules 120 in the second direction Y is 0.8-1.2. As shown in Figure 3 The ratio of the width of the first support 131 in the second direction Y to the sum of the widths of all battery modules 120 in the second direction Y is 0.8-1.2. As shown in

[0083] The ratio of the height of the first support 131 in the third direction Z to the height of the battery module 120 in the third direction Z is 0.8-1.1, for example, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1; preferably, the ratio is 1, that is, the height of the first support 131 in the third direction Z is the same as the height of the battery module 120, which can avoid occupying additional space of the battery compartment while ensuring deformation energy absorption performance.

[0084] As shown in Figure 3 , Figure 4 and Figure 7 , the battery pack 100 further comprises a first panel 113, the first panel 113 is located at one end of the plurality of battery modules 120 along the first direction X, and the second support 132 is located between the first panel 113 and the battery module 120 adjacent to the first panel 113.

[0085] As shown in Figure 7 , the second support 132 comprises a plurality of energy absorption grooves 134, and the openings of the energy absorption grooves 134 face the first direction X. By providing a plurality of energy absorption grooves 134, when the battery pack 100 is subjected to vibration, drop, impact, extrusion, expansion, etc. during transportation or use, the plurality of energy absorption grooves 134 on the second support 132 can deform to absorb energy, thereby protecting the integrity of the battery cell structure in the battery module 120 and reducing the risk of battery cell leakage, fire and explosion.

[0086] As shown in Figure 7 and Figure 8 , at least part of the energy absorption grooves 134 are through hole structures extending along the first direction X. By forming the energy absorption grooves 134 as through hole structures, when the energy absorption grooves 134 deform to absorb energy, the groove walls of the energy absorption grooves 134 can deform towards the accommodation space formed by the through hole structures, which is conducive to the deformation of the energy absorption grooves 134 and can improve the deformation energy absorption capacity of the energy absorption grooves 134. It can be understood that the plurality of energy absorption grooves 134 can all be through hole structures, or some can be through hole structures.

[0087] As shown in Figure 7 and Figure 8 , the plurality of energy absorption grooves 134 are distributed along the second direction Y and the third direction Z on the second support 132. By distributing the plurality of energy absorption grooves 134 along the second direction Y and the third direction Z, the extrusion force received by the energy absorption grooves 134 can be as evenly distributed as possible, so that the energy absorption grooves 134 on each part of the second support 132 can deform to absorb energy at the same time. Of course, the plurality of energy absorption grooves 134 can also be arrayed or irregularly distributed.

[0088] As shown in Figure 7 and Figure 8As shown, the plurality of energy absorption grooves 134 are rectangular, i.e., the second support 132 can be in a frame structure, so that the mass of the second support 132 can be relatively light. Among them, the sizes of the plurality of energy absorption grooves 134 can be different, which are specifically set according to the structural space between the two adjacent battery modules 120. Of course, the energy absorption grooves 134 can also be triangular, pentagonal, hexagonal or irregular, and the shapes and sizes of the plurality of energy absorption grooves 134 can be different, as long as the energy absorption effect can be achieved, and the present disclosure does not limit this.

[0089] As shown in Figure 7 and Figure 8 , the second support 132 can be in a "U" structure. When the second support 132 is connected with the bottom plate 115 of the lower cabinet 111, it can be connected by bolt connection, clamping, riveting, welding, bonding, etc. The second support 132 in the "U" structure can be fixedly connected or detachably connected with the bottom plate 115 of the lower cabinet 111 through two legs.

[0090] As shown in Figure 7 , at least part of the groove walls of the energy absorption grooves 134 are formed with crush guide grooves 135. By forming the crush guide grooves 135 on the groove walls of the energy absorption grooves 134, it is beneficial to the deformation and energy absorption of the energy absorption grooves 134 after the second support 132 is pressed.

[0091] Among them, as shown in Figure 7 , the crush guide grooves 135 can be located at the connection positions of the two intersecting groove walls in the energy absorption grooves 134, which can improve the deformation and energy absorption performance of the two intersecting groove walls in the energy absorption grooves 134. The crush guide grooves 135 can be formed in each energy absorption groove 134. When the energy absorption grooves 134 are rectangular, the energy absorption grooves 134 have four corners, and the crush guide grooves 135 are arranged at the four corners respectively to improve the deformation and energy absorption performance of each energy absorption groove 134.

[0092] Among them, as shown in Figure 7 , the crush guide grooves 135 are in a through-hole structure, and the crush guide grooves 135 arranged on the adjacent corners of the adjacent two energy absorption grooves 134 can be communicated, thereby further improving the deformation and energy absorption performance of the two intersecting groove walls in the energy absorption grooves 134. Among them, the crush guide grooves 135 can also be located on the groove walls at any position of the energy absorption grooves 134.

[0093] Among them, as shown in Figure 7 , the crush guide grooves 135 can be located on the middle positions of the groove walls along the first direction X, i.e., the energy absorption grooves 134 can be easily deformed and collapsed for energy absorption at the middle positions in the first direction X after the second support 132 is pressed, thereby improving the deformation and energy absorption performance of the energy absorption grooves 134.

[0094] The plurality of crushing guide grooves 135 can be distributed on the second support 132 along the second direction Y and the third direction Z, that is, the plurality of crushing guide grooves 135 can be distributed on the same preset plane, for example, on a plane perpendicular to the first direction X, which is conducive to the deformation and crushing of the energy absorption grooves 134.

[0095] The second support 132 can be formed of an insulating material. The positive and negative copper bars and wires of the battery module 120 are arranged in different energy absorption grooves 134 through the through-hole structure of the second support 132, and the insulating material is used to form an insulating gap between the positive and negative copper bars and wires, thereby reducing the risk of short circuit of the battery pack 100 when falling.

[0096] When the second support 132 and the battery module 120 are assembled into the battery compartment, the second support 132 can be bonded with the adjacent battery module 120 and the first panel 113, thereby improving the stability after connection and avoiding misalignment between the two.

[0097] When the second support 132 and the battery module 120 are assembled into the battery compartment, a positioning structure can be provided between the second support 132 and the adjacent battery module 120 and the first panel 113, so as to form assembly positioning and avoid misalignment between the two. At the same time, when the battery pack 100 is subjected to vibration, falling, collision, extrusion, expansion, etc. during transportation or use, the positioning structure can prevent the second support 132 from misaligning in the second direction Y and the third direction Z, thereby ensuring the deformation and energy absorption performance of the second support 132 on the adjacent battery module 120.

[0098] When the second support 132 is assembled into the battery compartment, the second support 132 can be detachably connected with the lower box body 111, and the position of the second support 132 along the first direction X on the lower box body 111 can be adjusted, so as to overcome the tolerance of the lower box body 111 and the battery module 120 during production and assembly, thereby enabling the second support 132 to be installed at a suitable position and providing better deformation and energy absorption performance.

[0099] The ratio of the width of the second support 132 in the second direction Y to the sum of the widths of all the battery modules 120 in the second direction Y is 0.8-1.2. Figure 3 As shown in the figure, the ratio of the width of the second support 132 in the second direction Y to the sum of the widths of the four groups of battery modules 120 in the second direction Y is 0.8-1.2, for example, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2; preferably, the ratio is 1, that is, the width of the second support 132 in the second direction Y is equal to the sum of the widths of all the battery modules 120 in the second direction Y.

[0100] The ratio of the height of the second support 132 in the third direction Z to the height of the battery module 120 in the third direction Z is 0.8-1.1, for example, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1; preferably, the ratio is 1, that is, the height of the second support 132 in the third direction Z is the same as the height of the battery module 120.

[0101] As shown in Figure 9 and Figure 10 , the second support 132 further comprises a plurality of strip-shaped grooves 136, and the extension direction of the strip-shaped grooves 136 intersects the first direction X. Through the arrangement of the strip-shaped grooves 136, the energy absorption performance of the second support 132 under compression deformation at the strip-shaped grooves 136 can be improved. The strip-shaped grooves 136 can be recessed grooves or notches formed on the surface of the second support 132.

[0102] Among them, the strip-shaped grooves 136 can be located in the middle region of the second support 132 along the first direction X, and the energy absorption groove 134 at the middle position in the first direction X can be easily deformed and collapsed to absorb energy, thereby improving the deformation energy absorption performance of the energy absorption groove 134.

[0103] Among them, the strip-shaped grooves 136 can be arranged in a circle on the outer circumferential surface of the second support 132 along the second direction Y and the third direction Z, thereby improving the compression deformation energy absorption performance of the second support 132 in the middle region along the first direction X. At the same time, a circle of strip-shaped grooves 136 can also be arranged on the inner surface of the energy absorption groove 134, that is, a circle of strip-shaped grooves 136 can be arranged on the inner and outer surfaces of the energy absorption groove 134, and the strip-shaped grooves 136 on the inner and outer surfaces can be positionally coincident to thin the thickness of the energy absorption groove 134 at this position and improve the deformation and collapse energy absorption performance.

[0104] Among them, the collapse guide groove 135 on the second support 132 can be communicated with the strip-shaped groove 136, that is, the collapse guide groove 135 can be located at the groove bottom of the strip-shaped groove 136 and penetrate the groove wall of the energy absorption groove 134, so as to further improve the deformation and collapse energy absorption performance of the energy absorption groove 134 at the position where the collapse guide groove 135 is arranged.

[0105] It can be understood that the first support 131 can also be provided with the strip-shaped grooves 136 on the second support 132 described above, and the arrangement mode can be consistent with the strip-shaped grooves 136 described above. The structure of the energy absorption groove 134 on the second support 132 can be the same as or different from the structure of the energy absorption groove 134 on the second support 132, and the structure of the second support 132 can be the same as or different from the structure of the first support 131. The present disclosure does not limit this.

[0106] As shown in Figure 3 , Figure 4 and Figure 11As shown, the battery pack 100 further comprises a second panel 114 located at the other end of the plurality of battery modules 120 along the first direction X, and a third support 133 located between the second panel 114 and the battery module 120 adjacent to the second panel 114.

[0107] As shown in Figure 11 , the third support 133 comprises a plurality of energy absorption grooves 134, and the openings of the energy absorption grooves 134 face the first direction X. By arranging the plurality of energy absorption grooves 134, when the battery pack 100 is subjected to vibration, falling, collision, extrusion, swelling, etc. during transportation or use, the plurality of energy absorption grooves 134 on the third support 133 can deform and absorb energy, thereby protecting the integrity of the battery cell structure in the battery module 120 and reducing the risk of battery cell leakage, fire and explosion.

[0108] As shown in Figure 11 and Figure 12 , at least part of the energy absorption grooves 134 are through-hole structures extending along the first direction X. By forming the energy absorption grooves 134 as through-hole structures, when the energy absorption grooves 134 deform and absorb energy, the groove walls of the energy absorption grooves 134 can deform towards the accommodation space formed by the through-hole structures, which is conducive to the deformation of the energy absorption grooves 134 and can improve the deformation and energy absorption capacity of the energy absorption grooves 134. It can be understood that the plurality of energy absorption grooves 134 can all be through-hole structures, or some can be through-hole structures.

[0109] As shown in Figure 11 and Figure 12 , the plurality of energy absorption grooves 134 are distributed along the second direction Y and the third direction Z. By predefining the second direction Y and the third direction Z of the plurality of energy absorption grooves 134, the extrusion force received by the energy absorption grooves 134 can be as evenly distributed as possible, so that the energy absorption grooves 134 on each part of the third support 133 can deform and absorb energy at the same time. Of course, the plurality of energy absorption grooves 134 can also be arrayed or irregularly distributed.

[0110] As shown in Figure 11 and Figure 12 , the plurality of energy absorption grooves 134 are rectangular, i.e. the third support 133 can have a frame structure, so that the mass of the second support 132 can be relatively light. Among them, the sizes of the plurality of energy absorption grooves 134 can be different, and are specifically arranged according to the structural space between the two adjacent battery modules 120. Of course, the energy absorption grooves 134 can also be triangular, pentagonal, hexagonal or irregular, and the shapes and sizes of the plurality of energy absorption grooves 134 can be different, as long as the energy absorption effect can be achieved, and the present disclosure does not limit this.

[0111] As shown in Figure 11 and Figure 12As shown, the third support 133 can be in a "mountain" structure. When the third support 133 is connected with the bottom plate 115 of the lower cabinet 111, the connection can be achieved by means of bolt connection, clamping, riveting, welding, bonding, etc. The third support 133 in the "mountain" structure can be fixedly connected or detachably connected with the bottom plate 115 of the lower cabinet 111 through the three legs.

[0112] As shown, Figure 11 The slot wall of at least part of the energy absorption slot 134 is formed with a crushing guide slot 135. By forming the crushing guide slot 135 on the slot wall of the energy absorption slot 134, it is beneficial to the deformation and energy absorption of the energy absorption slot 134 after the third support 133 is pressed.

[0113] As shown, Figure 11 The crushing guide slot 135 can be located at the connection position of the two intersecting slot walls in the energy absorption slot 134, which can improve the deformation and energy absorption performance of the two intersecting slot walls in the energy absorption slot 134. The crushing guide slot 135 can be formed in each energy absorption slot 134. When the energy absorption slot 134 is in a rectangular shape, the energy absorption slot 134 has four corners, and the crushing guide slot 135 is arranged at each corner to improve the deformation and energy absorption performance of each energy absorption slot 134.

[0114] As shown, Figure 11 The crushing guide slot 135 is in a through-hole structure, and the crushing guide slots 135 arranged on the adjacent corners of the adjacent two energy absorption slots 134 can be connected, thereby further improving the deformation and energy absorption performance of the two intersecting slot walls in the energy absorption slot 134. The crushing guide slot 135 can also be located on the slot wall at any position of the energy absorption slot 134.

[0115] As shown, Figure 11 The crushing guide slot 135 can be located at the middle position of the slot wall along the first direction X, that is, the energy absorption slot 134 can easily deform and collapse for energy absorption at the middle position in the first direction X after the third support 133 is pressed, thereby improving the deformation and energy absorption performance of the energy absorption slot 134.

[0116] The plurality of crushing guide slots 135 can be distributed along the second direction Y and the third direction Z on the third support 133, that is, the plurality of crushing guide slots 135 can be distributed on the same preset plane, for example, on a plane perpendicular to the first direction X, which is beneficial to the deformation and energy absorption of each energy absorption slot 134.

[0117] The third support 133 can be formed of an insulating material. The positive and negative copper bars and wires of the battery module 120 are arranged in different energy absorption grooves 134 through the through-hole structure on the third support 133, and the insulating material is used to form an insulating gap between the positive and negative copper bars and wires, thereby reducing the risk of short circuit of the battery pack 100 when falling. The insulating material can be a hard plastic material, such as ABS material.

[0118] When the third support 133 and the battery module 120 are assembled into the battery compartment, the third support 133 can be bonded with the adjacent battery module 120 and the second panel 114, thereby improving the stability after connection and avoiding misalignment between them.

[0119] When the third support 133 and the battery module 120 are assembled into the battery compartment, a positioning structure can be provided between the third support 133 and the adjacent battery module 120 and the second panel 114, thereby forming assembly positioning and avoiding misalignment between them. At the same time, when the battery pack 100 is subjected to vibration, falling, collision, extrusion, expansion, etc. during transportation or use, the positioning structure can prevent the third support 133 from misaligning in the second direction Y and the third direction Z, thereby ensuring the deformation energy absorption performance of the third support 133 on the adjacent battery module 120.

[0120] When the third support 133 is assembled into the battery compartment, the third support 133 can be detachably connected with the lower box body 111, and the position of the lower box body 111 along the first direction X can be adjusted, thereby overcoming the tolerance of the lower box body 111 and the battery module 120 during production and assembly, so that the third support 133 can be installed in the appropriate position to provide better deformation energy absorption performance.

[0121] The ratio of the width of the third support 133 in the second direction Y to the sum of the widths of all the battery modules 120 in the second direction Y is 0.8-1.2. As shown in FIG. 8, the ratio of the width of the third support 133 in the second direction Y to the sum of the widths of the four groups of battery modules 120 in the second direction Y is 0.8-1.2, for example, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2; preferably, the ratio is 1, i.e., the width of the third support 133 in the second direction Y is equal to the sum of the widths of all the battery modules 120 in the second direction Y. Figure 3

[0122] ​The ratio of the height of the third support 133 in the third direction Z to the height of the battery module 120 in the third direction Z is 0.8-1.1, for example, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1; preferably, the ratio is 1, that is, the height of the third support 133 in the third direction Z is the same as the height of the battery module 120.

[0123] As shown in Figure 7 and Figure 11 The third support 133 can have the same structure as the first support 131, facilitating production and manufacture of the third support 133 and the first support 131, improving production efficiency and reducing production cost.

[0124] It can be understood that the third support 133 can also be provided with the strip-shaped groove 136 on the second support 132, and the arrangement mode can be consistent with the strip-shaped groove 136. The energy-absorbing structure on the third support 133 can be the same as or different from the energy-absorbing groove 134 on the first support 131 and / or the second support 132, and the structure of the third support 133 can be the same as or different from the structure of the first support 131, which is not limited in the present disclosure.

[0125] The first support 131, the second support 132, and the third support 133 can all be integrally formed, so that they have good stress dispersion effect when being pressed, thereby improving the deformation energy-absorbing performance. Of course, at least one of the first support 131, the second support 132, and the third support 133 can be formed by a plurality of sub-supports, and the plurality of sub-supports are stacked along the first direction X, that is, the overall support is formed by splicing a plurality of sub-supports.

[0126] As shown in Figure 3 Two battery modules 120 are arranged in the battery compartment along the first direction X, and therefore one first support 131 is arranged. If more battery modules 120 are arranged in the battery compartment along the first direction X, a first support 131 can be arranged between adjacent battery modules 120, and the relationship between the number N1 of the first supports 131 and the number N2 of the battery modules 120 arranged in the battery compartment along the first direction X is N1=N2-1.

[0127] In the embodiments of the present disclosure, the terms "first", "second", "third" are only used for descriptive purposes, and should not 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 understood in a broad sense, 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 present disclosure can be understood according to the specific circumstances.

[0128] In the description of the embodiments of the present disclosure, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore, cannot be understood as a limitation on the embodiments of the present disclosure.

[0129] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "certain embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative expressions of the above terms do 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 an appropriate manner.

[0130] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including such departures from the present disclosure that come within known, accepted, or customary practice in the art to which the present disclosure pertains. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery box body, which is formed with a battery compartment; a plurality of battery modules, which are located in the battery compartment, and each of the battery modules comprises a plurality of battery cells arranged along a first direction; wherein, along the first direction, at least one of between two adjacent battery modules, one end of the plurality of battery modules and the other end of the plurality of battery modules is provided with a support, and the support is provided with a plurality of energy absorption grooves on the upper side, and at least part of the groove walls of the energy absorption grooves is provided with a crushing guide groove.

2. The battery pack of claim 1, wherein, At least part of the crushing guide groove penetrates the groove wall of the energy absorption groove.

3. The battery pack of claim 2, wherein, At least part of the crushing guide groove is located at the connection position of the two intersecting groove walls in the energy absorption groove.

4. The battery pack of claim 2, wherein, At least part of two adjacent energy absorption grooves are communicated through the crushing guide groove.

5. The battery pack of claim 4, wherein, At least part of the crushing guide groove that communicates the adjacent two energy absorption grooves is located at the connection position of the two intersecting groove walls in the crushing guide groove.

6. The battery pack of claim 1, wherein, At least part of the energy absorption grooves is a through-hole structure penetrating along the first direction.

7. The battery pack of claim 1, wherein, A plurality of the energy absorption grooves are distributed along a second direction and a third direction, and the crushing guide groove is located at the middle position of the energy absorption groove along the first direction; the first direction is the thickness direction of the battery cell, the second direction is the width direction of the battery cell, and the third direction is the height direction of the battery cell.

8. The battery pack of claim 1, wherein, At least part of the surface of the energy absorption groove is provided with a plurality of strip-shaped grooves, the extension direction of the strip-shaped grooves intersects the first direction, and at least part of the strip-shaped grooves extends to the surface of the energy absorption groove.

9. The battery pack of claim 8, wherein, At least part of the crushing guide groove is located at the groove bottom of the strip-shaped groove and penetrates the groove wall of the energy absorption groove.

10. The battery pack of claim 1, wherein, Along the first direction, a first support is arranged between two adjacent battery modules, a second support is arranged at one end of the plurality of battery modules, and a third support is arranged at the other end of the plurality of battery modules, and the structures of at least any two of the first support, the second support and the third support are the same and / or the structures of the energy absorption grooves are the same.

11. The battery pack of claim 1, wherein, Along the first direction, a first support is arranged between two adjacent battery modules, a second support is arranged at one end of the plurality of battery modules, and a third support is arranged at the other end of the plurality of battery modules; the battery pack further comprises a first panel and a second panel, the second support is located between the first panel and the battery module adjacent to the first panel, and the third support is located between the second panel and the battery module adjacent to the second panel; wherein, the first support is bonded with the adjacent battery module, and / or the second support is bonded with the adjacent battery module and the first panel, and / or the third support is bonded with the adjacent battery module and the second panel.

12. The battery pack of claim 1, wherein, A positioning structure is arranged between the support and the adjacent battery module.

13. The battery pack of claim 1, wherein, The battery box body comprises a lower box body and a box cover, and the lower box body and the box cover enclose the battery compartment, and the support is connected with the lower box body.

14. The battery pack of claim 1, wherein, The ratio of the width of the support in the second direction to the sum of the widths of all the battery modules in the second direction is 0.8-1.2; the first direction is the thickness direction of the battery monomer, and the second direction is the width direction of the battery monomer; and / or, The ratio of the height of the support in the third direction to the height of the battery module is 0.8-1.1; the first direction is the thickness direction of the battery monomer, and the third direction is the height direction of the battery monomer.

15. An energy storage system characterized by, The battery pack comprising any one of claims 1-14.

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