CN219959231U - Battery pack and inversion energy storage combined equipment - Google Patents

Abstract

The utility model provides a battery pack and an inversion energy storage combined device. The battery pack comprises a battery cell group, the battery cell group comprises a plurality of battery cells, the battery cells are stacked and arranged along the thickness direction of the battery cell group, and the battery cells positioned at the end part of the battery cell group are end battery cells. The battery pack also comprises a limiting plate, a binding belt and an elastic piece. The limiting plate is abutted against the end cell, and the binding band is configured to restrict the cell group and the limiting plate sleeve into a whole. The elastic piece is elastically abutted between the limiting plate and the maximum surface of the end cell. Through setting up the elastic component between the tip electric core of electric core group and limiting plate, make elastic component elasticity butt in electric core group, so, even the band takes place creep, the elastic component also can reduce even offset the influence of band creep with electric core group elasticity butt to can continue to restrain electric core inflation, improve the safety in utilization of battery package. In addition, the elastic piece is elastically abutted against the maximum surface of the end cell, so that the contact area between the elastic piece and the end cell is maximum, and the effect of inhibiting the expansion of the cell group is optimal.

Description

Battery pack and inversion energy storage combined equipment

Technical Field

The utility model relates to the technical field of power supplies, in particular to a battery pack and an inversion energy storage combined device comprising the battery pack.

Background

The inverter energy storage combined equipment (generally comprising an inverter device and a battery pack) is internally provided with the battery pack, and the battery pack is internally provided with a plurality of electric cores. For the high-capacity inversion energy storage combined equipment, the number of the internal electric cores is large, and the battery is contained and is easy to expand. To prevent the battery pack from expanding, a plurality of battery cells are usually assembled by bundling them into a group with a tie.

Along with the increase of the service time of products such as inversion energy storage combination equipment, the influence of the expansion reaction force of the battery core on the strap is stronger, and the creep phenomenon (the phenomenon that the strain is increased along with the time extension of a solid material under the condition of keeping the stress unchanged) can also occur on the strap. The restraining force of the binding belt on the battery cells is reduced with the increase of time (also called stress relaxation), the binding restraining effect on the battery cells is weakened, and the capacity of restraining the battery cells from expanding is reduced.

Disclosure of Invention

In view of the above, the present utility model provides a battery pack to solve the problem that the ability of the strap to inhibit the battery cell from expanding is reduced.

In addition, there is a need for an inverter energy storage combination device including the battery pack.

The first aspect of the utility model provides a battery pack comprising a battery cell group. The battery cell group comprises a plurality of battery cells, each battery cell is stacked and arranged along the thickness direction of the battery cell, and the battery cells positioned at the end part of the battery cell group are end battery cells. The battery pack further includes:

the limiting plate is abutted against the maximum surface of the end cell, and the maximum surface is far away from the cell adjacent to the end cell;

the binding belt is configured to restrict the battery cell group and the limiting plate sleeve into a whole; and

and the elastic piece is elastically abutted between the limiting plate and the maximum surface of the end cell.

In one embodiment, the elastic member includes a main body and a spring formed on the main body. The main body part is fixed in the surface that limiting plate is close to the electric core group, and the shell fragment butt is in the biggest surface of tip electric core. The spring plate may be integrally formed with the main body, and the spring plate may be formed in an intermediate inner region of the main body or in an edge region of the main body. The body portion is a generally rectangular plate-like structure that may be made of an elastic material or a rigid material. The number of the elastic sheets can be one or more, preferably a plurality. The elastic sheets are abutted to the battery cell group, so that the concentrated stress of the battery cell can be avoided, and the effect of inhibiting the expansion of the battery cell group is better. The elastic sheet may be formed in the middle inner region of the main body portion or may be formed in the edge region of the main body portion.

In one embodiment, the main body portion is formed with a relief groove, and the position of the relief groove corresponds to the position of the spring piece. The avoidance groove can provide a certain movable space for the elastic sheet so as to facilitate deformation of the elastic sheet. It will be appreciated that the spring formed at the edge of the body portion may not be provided with a relief groove corresponding to the spring when its orthographic projection on the body portion is not within the coverage of the body portion.

In one embodiment, the relief groove extends through the body portion in the thickness direction. That is, the surface of the limiting plate may be exposed from the avoidance groove.

In one embodiment, the spring comprises a first portion extending from a surface of the body toward the cell stack and a second portion extending from an edge of the first portion toward the body. The first and second portions may be made of an elastic material. The elastic sheet formed by the first part and the second part forms a shape arched towards the battery cell group, which is beneficial to elastic abutting connection of the battery cell group.

In one embodiment, the angle between the second portion and the first portion is an obtuse angle. If the angle between the first portion and the second portion is acute or right, the angle may be too sharp to damage the cell. The included angle between the first part and the second part is an obtuse angle, which indicates that the joint of the first part and the second part is more gentle, and the probability of damaging the battery cell can be reduced.

In one embodiment, the elastic piece is fixed on the surface of the limiting plate, which is close to the battery cell group, through the adhesive layer. Optionally, the main body of the elastic element is fixed on the surface of the limiting plate, which is close to the battery cell group, through an adhesive layer. The size of the main body part can be smaller than that of the limiting plate, and the orthographic projection of the whole elastic piece on the limiting plate is entirely located in the range covered by the limiting plate. The material of the adhesive layer may be conventional or non-conventional glue in the art, and the present utility model is not limited thereto.

In one embodiment, the surface of the limiting plate facing away from the battery cell group is provided with a groove, and the strap part is accommodated in the groove. Along the arrangement direction of each cell group (the length direction of the limiting plate), the groove penetrates through the whole limiting plate (approximately rectangular, and the length direction of the groove is parallel to the arrangement direction of each cell group). The groove can be arranged at the top of the limiting plate, the groove can be arranged at the bottom of the limiting plate, or the groove can be arranged at the top and the bottom of the limiting plate at the same time. The binding belt can be sleeved on the top of the battery cell group and the limiting plate, can be sleeved on the bottom of the battery cell group and the limiting plate, or can be sleeved on the top and the bottom of the battery cell group and the limiting plate at the same time.

In one embodiment, the battery pack further includes a housing, and the battery cell group is accommodated in the housing. The housing is generally cubic in shape. The stacking arrangement direction of the plurality of electric cores in each electric core group can be the length direction of the shell, and the arrangement direction among the electric core groups can be the width direction of the shell. Along the length direction of the shell, one end cell in the cell group is close to the short side of the shell, and a certain accommodating space is formed between the other end cell and the shell. The accommodation space may be used to accommodate a BMS (battery management system) board, a step-up and step-down module, and the like.

Another aspect of the utility model provides an inverted energy storage combination device comprising an inverter and a battery pack as described above, the battery pack and the inverter being electrically connected. The inversion energy storage combined energy storage device further comprises a plug-in socket, and the plug-in socket is used for being connected with external electric equipment (such as household appliances and the like) to charge the electric equipment.

In one embodiment, the inverter energy storage combination device further includes a socket, where the socket is used to connect with an external electrical device (e.g., a household appliance, etc.) to charge the electrical device.

According to the battery pack disclosed by the embodiment of the utility model, the elastic piece is arranged between the end battery core of the battery core group and the limiting plate, so that the elastic piece is elastically abutted (the elastic abutting means that the two parts are mutually contacted and elastic exists between the two parts) on the battery core group, and even if the strap is in creep, the elastic piece can be elastically abutted with the battery core group to reduce or even offset the influence of the creep of the strap, so that the expansion of the battery core can be continuously restrained, and the use safety of the battery pack is improved. In addition, the elastic piece is elastically abutted against the maximum surface of the end cell, so that the contact area between the elastic piece and the end cell is maximum, and the effect of inhibiting the expansion of the cell group is optimal.

The inversion energy storage combined equipment provided by the embodiment of the utility model comprises the inversion device and the battery pack, and because the elastic piece is arranged between the end battery core of the battery core group and the limiting plate and is abutted against the battery core group, even if the strap is in creep, the elastic piece can be elastically abutted against the battery core group to reduce or even offset the influence of the creep of the strap, so that the expansion of the battery core can be continuously restrained, the elastic piece is elastically abutted against the maximum surface of the end battery core, the expansion of the battery core group is restrained optimally, and the safety of the energy storage equipment can be further improved.

Drawings

Fig. 1 is a schematic structural diagram of an inverter energy storage combination device according to an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a battery pack of the inverter energy storage combination device shown in fig. 1 in an embodiment.

Fig. 3 is a schematic structural diagram of a cell unit of the battery pack shown in fig. 2 in an embodiment.

Fig. 4 is a schematic structural diagram of a cell unit of the battery pack shown in fig. 2 in another embodiment.

Fig. 5 is an exploded view of the battery cell assembly shown in fig. 4.

Fig. 6 is a schematic structural view of the assembled battery cell group of fig. 5 after the belts, elastic members and limiting plates

Fig. 7 is a schematic structural diagram of the elastic member of the battery cell group shown in fig. 5.

Fig. 8 is a schematic structural diagram of a limiting plate of the battery cell set shown in fig. 5.

Description of the main reference signs

Battery pack 100

Cell group 10

Housing 20

Limiting plate 30

The tie strap 40

Elastic member 50

Cell 11

End cell 110

Maximum surface 111

Groove 301

Body portion 51

Spring piece 52

Dodge groove 510

First portion 521

Second portion 522

Inverter energy storage combination device 200

Socket 201

The following detailed description will further illustrate embodiments of the utility model in conjunction with the above-described drawings.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the utility model belong. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

It will be appreciated that when describing a parallel/perpendicular arrangement of two components, the angle between the two components allows for a tolerance of + -10% relative to standard parallel/perpendicular.

The inversion energy storage combined equipment is internally provided with a battery pack, and a plurality of electric cores are arranged in the battery pack. For the high-capacity inversion energy storage combined equipment, the number of the internal electric cores is large, and the battery is contained and is easy to expand. To prevent the battery pack from expanding, a plurality of battery cells are usually assembled by bundling them into a group with a tie.

Along with the increase of the using time of products such as inversion energy storage combination equipment, the influence of the expansion reaction force of the battery cells on the binding belt is stronger, the creep phenomenon can occur on the binding belt, the binding constraint effect on the battery cells can be further weakened, and the capacity of inhibiting the expansion of the battery cells is reduced.

Therefore, the utility model provides a battery pack and an inversion energy storage combined device, which are used for solving the problem that the capacity of a binding belt for inhibiting the expansion of a battery cell is reduced.

A battery pack comprises a battery cell group, wherein the battery cell group comprises a plurality of battery cells. Each cell is stacked along the thickness direction, and the cell at the end of the cell group is an end cell. The battery pack also comprises a limiting plate, a binding belt and an elastic piece. The limiting plate is abutted against the surface of the end cell, and the surface is perpendicular to the thickness direction of the end cell and far away from the cell adjacent to the end cell. The strap is configured to constrain the cell stack and the limiting plate collar as a unit. The elastic piece is elastically abutted between the limiting plate and the surface of the end cell.

According to the battery pack, the elastic piece is arranged between the end cell of the cell group and the limiting plate, so that the elastic piece is elastically abutted against the end cell of the cell group, even if the strap creep occurs, the elastic piece can be elastically abutted against the end cell to reduce or even offset the influence of the strap creep, and therefore the expansion of the cell is effectively restrained, and the use safety of the battery pack is improved.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without collision.

Referring to fig. 1 to 8, a battery pack 100 according to an embodiment of the present utility model is provided. As shown in fig. 1, the battery pack 100 may be electrically connected to an inverter (not shown) as an inverter energy storage combination device 200 applied in a home energy storage scenario. The inverter inverts the direct current of the battery pack 100 into alternating current and inputs the alternating current into the home electric network, and meanwhile, external electric network power is allocated to enter the home electric network, and the inverted direct current of the battery pack 100 can be transmitted to the external electric network. Referring to fig. 2 to 8, the battery pack 100 includes a battery cell pack 10, a housing 20 accommodating the battery cell pack 10, a limiting plate 30, a strap 40 and an elastic member 50.

Referring to fig. 2 and 3, the battery cell assembly 10 includes a plurality of battery cells 11, and the plurality of battery cells 11 are stacked along a thickness direction of the battery cell assembly 10. The two adjacent cells 11 can be directly contacted without clamping an anti-slip pad, foam and the like. Along the arrangement direction of the cells 11, the cells 11 located at the ends of the cell group 10 are referred to as end cells 110. It will be appreciated that if there are only two cells 11 of the cell stack 10, then both of these cells 11 can be referred to as end cells 110. If the number of the cells 11 of the cell group 10 is greater than or equal to three, two cells 11 located at both ends of the cell group 10 along the arrangement direction of the cells 11 are referred to as end cells 110. As shown in fig. 3, the number of the cell groups 10 may be one column. As shown in fig. 4, the number of the cell groups 10 is two. In other embodiments, the number of the cell groups 10 may be greater than two, and the present utility model is not limited thereto. The battery cell 11 can be formed by winding a positive pole piece, a diaphragm and a negative pole piece, and can also be formed by stacking the positive pole piece, the diaphragm and the negative pole piece. The battery cell 11 may be a soft package battery cell, a steel shell battery cell, an aluminum shell battery cell, or the like, and the present utility model is not limited thereto.

As shown in fig. 2, the housing 20 is generally cubic in shape. The stacking direction of the plurality of battery cells 11 in each battery cell group 10 may be the length direction of the housing 20, and the arrangement direction between the battery cell groups 10 may be the width direction of the housing 20. Along the length direction of the housing 20, one end cell 110 in the cell group 10 is close to the short side of the housing 20, and a certain accommodating space is formed between the other end cell 110 and the housing 20. The receiving space may be used to receive a BMS (battery management system, not shown) board, a lifting and pressing module (not shown), and the like. It will be appreciated that the housing 20 further includes a cover (not shown) or the like to form a closed space for accommodating the battery cell assembly 10.

Referring to fig. 3 and 4, the limiting plate 30 abuts against a surface of the end cell 110. As shown in fig. 5, the end cell 110 has a substantially rectangular parallelepiped shape, and the surface is the largest one of six surfaces of the end cell 110, and is referred to as the largest surface 111 of the end cell 110. The maximum surface 111 is remote from the cell 11 adjacent to the end cell 110. If the end cell 110 has a square shape, the maximum surface 111 is a surface perpendicular to the thickness direction of the end cell 110 (or the stacking direction of the cells 11) and away from the cell 11 adjacent to the end cell 110. By abutting is meant that the two parts are in direct contact and have a certain force against each other. That is, the limiting plate 30 contacts the end cell 110, and there is a force between the limiting plate 30 and the end cell 110.

It can be understood that, in the two end cells 110 of the same column of the cell group 10, the surface of one of the end cells 110 may be provided with the limiting plate 30 and abut against the end cell, or the surface of the two end cells 110 may be provided with the limiting plate 30 and abut against the end cell. For the battery cell groups 10 in different columns, the end part of each battery cell group 10 can be respectively provided with a limiting plate 30, or the end parts of a plurality of battery cell groups 10 can be provided with only one limiting plate 30 which is abutted against the plurality of battery cell groups 10.

Referring to fig. 3 and 4, the strap 40 is configured to constrain the cell stack 10 and the restraint plate 30 as a unit. The strap 40 may have elasticity, and may be sleeved on the outer circumferences of the cell group 10 and the limiting plate 30. The binding belt 40 can compress the cell group 10 and the limiting plate 30, and plays a role in restraining the cell group 10 and the limiting plate 30, so that an integral body is formed between the cell group 10 and the limiting plate 30 (namely, no movement occurs between the cell group 10 and the limiting plate 30). A tie 40 may constrain one cell stack 10 and the limiting plates 30 that abut the cell stack 10, or may constrain multiple cell stacks 10 and the limiting plates 30 that abut the cell stacks 10 (whether the number of limiting plates 30 is one or more). The belt 40 may be made of an elastic material, and the belt 40 may also be made of Fiber Reinforced Plastic (FRP), which may be, but is not limited to, carbon Fiber Reinforced Plastic (CFRP), or the like. The number of the bands 40 in the battery pack 100 may be one or more, and the present utility model is not limited thereto.

Referring to fig. 5 and 6, the elastic member 50 is elastically abutted between the limiting plate 30 and the maximum surface 111 of the end cell 110. The elastic abutment means that the two components are in contact with each other and there is an elastic force (a restoring force after deformation due to an external force) therebetween, that is, the elastic member 50 is in contact with the end cell 110 and has an elastic force, and the elastic member 50 is in contact with the limiting plate 30 and has an elastic force.

When the battery pack 10 expands after long-term charging and discharging, the tensile force of the strap 40 will increase, and in the long-term past, creep (stress relaxation) will occur to the strap, resulting in weaker and weaker ability to inhibit the expansion of the battery pack 10. In the battery pack 100 according to the embodiment of the utility model, the elastic member 50 is arranged between the end cell 110 of the cell group 10 and the limiting plate 30, so that the elastic member 50 is elastically abutted against the cell group 10, even if the strap 40 is in creep, the elastic member 50 can be elastically abutted against the cell group 10 to reduce or even offset the influence of the creep of the strap 40, thereby continuously inhibiting the expansion of the cell 11 and improving the use safety of the battery pack 100. In addition, the elastic member 50 elastically contacts the maximum surface 111 of the end cell 110, so that the contact area between the elastic member 50 and the end cell 110 is maximum, and the effect of suppressing the expansion of the cell stack 10 is optimal.

Referring to fig. 7, in some embodiments, the elastic member 50 includes a main body 51 and a spring 52 formed on the main body 51. The spring 52 may be integrally formed with the body 51. The main body 51 has a substantially rectangular plate-like structure, and may be made of an elastic material or a metal material, which can improve the strength of the manufactured main body 51 and the service life of the elastic member 50. Referring to fig. 5 to 7, the main body 51 is fixed on the surface of the limiting plate 30 near the cell set 10, and the spring plate 52 abuts against the maximum surface 111 of the end cell 110. The number of the spring pieces 52 may be one or more, preferably a plurality. The plurality of spring plates 52 are abutted against the battery cell group 10, so that the concentrated stress of the battery cell 11 can be avoided, and the effect of inhibiting the expansion of the battery cell group 10 is better. The spring piece 52 may be formed in the middle inner region of the main body 51, or may be formed in the edge region of the main body 51.

Optionally, in some embodiments, the main body 51 is fixed to the surface of the limiting plate 30 near the cell set 10 by an adhesive layer (not shown). The size of the main body 51 is smaller than that of the limiting plate 30, and the orthographic projection of the whole elastic member 50 on the limiting plate 30 is entirely located within the coverage range of the limiting plate 30. The material of the adhesive layer may be conventional or non-conventional glue in the art, and the present utility model is not limited thereto. In other embodiments, the main body 51 may be fixed to the surface of the limiting plate 30 near the cell set 10 by means of fitting, bolting, riveting, cold pressing or hot pressing.

As shown in fig. 7, in some embodiments, the spring 52 includes a first portion 521 extending from a surface of the body 51 toward the cell stack 10 and a second portion 522 extending from an edge of the first portion 521 toward the body 51. An included angle is formed between the first portion 521 and the second portion 522. The first portion 521 and the second portion 522 may be made of an elastic material. The spring plate 52 formed by the first portion 521 and the second portion 522 forms a shape arched toward the battery cell group 10, which is beneficial to elastic abutment of the battery cell group 10.

Alternatively, the angle between the first portion 521 and the second portion 522 may be an obtuse angle. If the angle between the first portion 521 and the second portion 522 is acute or right, the angle may be too sharp to damage the cell 11. The included angle between the first portion 521 and the second portion 522 is an obtuse angle, which indicates that the connection between the first portion 521 and the second portion 522 is relatively gentle, so as to reduce the probability of damaging the cell 11.

As shown in fig. 7, in some embodiments, the main body 51 is formed with a relief groove 510, and the position of the relief groove 510 corresponds to the position of the spring plate 52. The orthographic projection of the escape groove 510 on the main body portion 51 falls entirely within the range of the escape groove 510, and the escape groove 510 may penetrate the main body portion 51 in the thickness direction (i.e., the surface of the stopper plate 30 may be exposed from the escape groove 510). The avoidance groove 510 can provide a certain movement space for the spring plate 52, so that the spring plate 52 can be deformed. It is understood that the spring piece 52 formed at the edge of the main body 51 may not be provided with the escape groove 510 corresponding to the spring piece 52 when the orthographic projection thereof on the main body 51 is not within the range covered by the main body 51.

Referring to fig. 8, in some embodiments, a recess 301 is formed on a surface of the limiting plate 30 facing away from the battery cell group 10, and the strap 40 is partially received in the recess 301. The groove 301 is formed by the inward depression of the surface of the limiting plate 30 facing away from the cell stack 10. The strap 40 may be only received in the recess 301 and not directly fixed to the limiting plate 30, and in other embodiments, the strap 40 may be fixedly connected to the limiting plate 30 by bonding, bolting, riveting, cold pressing, hot pressing, or the like, which is not limited herein. Referring to fig. 5, the limiting plate 30 is substantially rectangular, and the length direction thereof is parallel to the arrangement direction of the cell groups 10. Along the arrangement direction of each cell group 10 (the length direction of the limiting plate 30), the grooves 301 penetrate the entire limiting plate 30. The groove 301 may be provided only at the top of the limiting plate 30, only at the bottom of the limiting plate 30, or at both the top and bottom of the limiting plate 30. The binding belt 40 can be sleeved on the top of the battery cell group 10 and the limiting plate 30, can be sleeved on the bottom of the battery cell group 10 and the limiting plate 30, or can be sleeved on the top and the bottom of the battery cell group and the limiting plate 30 at the same time.

Referring to fig. 1, the present utility model further provides an inverter energy storage combination device 200, which includes an inverter (not shown) and the battery pack 100 as described above. The battery pack 100 is electrically connected to the inverter device. The inverter and energy storage combination device 200 further includes a socket 201, where the socket 201 is used to connect with external electric equipment (e.g., a household appliance, etc.) to charge the electric equipment. The inverter device in the inverter energy storage combination device 200 can invert the direct current of the battery pack 100 into alternating current and then input the alternating current into the home power grid, meanwhile, the external power grid can be allocated to enter the home power grid, and the electricity of the battery pack 100 can be inverted and then conveyed to the external power grid.

In the battery pack 100 according to the embodiment of the utility model, the elastic member 50 is arranged between the end cell 110 of the cell group 10 and the limiting plate 30, so that the elastic member 50 is elastically abutted against the cell group 10, even if the strap 40 is in creep, the elastic member 50 can be elastically abutted against the cell group 10 to reduce or even offset the influence of the creep of the strap 40, thereby continuously inhibiting the expansion of the cell 11 and improving the use safety of the battery pack 100. In addition, the elastic member 50 elastically contacts the maximum surface 111 of the end cell 110, so that the contact area between the elastic member 50 and the end cell 110 is maximum, and the effect of suppressing the expansion of the cell stack 10 is optimal.

The inversion energy storage combination device 200 provided in the embodiment of the utility model includes the battery pack 100, and since the elastic member 50 is disposed between the end cell 110 of the cell group 10 and the limiting plate 30, the elastic member 50 is abutted against the cell group 10, even if the strap 40 is subject to creep, the elastic member 50 can be elastically abutted against the cell group 10 to reduce or even offset the creep influence of the strap 40, so that the expansion of the cell 11 can be continuously inhibited, and the elastic member 50 is elastically abutted against the maximum surface 111 of the end cell 110, so that the effect of inhibiting the expansion of the cell group 10 is optimal, and the safety of the inversion energy storage combination device 200 can be improved. It should be noted that the above designations of the components of the battery pack 100 and the inverter energy storage device 200 are for identification purposes only and should not be construed as limiting the embodiments of the present utility model.

The above description is of some embodiments of the utility model, but in practice the application is not limited to these embodiments. Other modifications and variations to the present utility model will be apparent to those of ordinary skill in the art in light of the present teachings.

Claims (10)

1. The utility model provides a battery package, includes electric core group, electric core group includes a plurality of electric cores, and each electric core stacks the arrangement along its thickness direction, is located the electric core of the tip of electric core group is tip electric core, its characterized in that, battery package still includes:

the limiting plate is abutted against the maximum surface of the end cell, and the maximum surface is far away from the cell adjacent to the end cell;

a strap configured to constrain the battery cell stack and the limiting plate collar as a unit; and

and the elastic piece is elastically abutted between the limiting plate and the maximum surface of the end cell.

2. The battery pack of claim 1, wherein the elastic member comprises a main body portion and a spring plate formed on the main body portion, the main body portion is fixed on a surface of the limiting plate, which is close to the cell group, and the spring plate abuts against the maximum surface of the end cell.

3. The battery pack according to claim 2, wherein the body portion is formed with a relief groove, and a position of the relief groove corresponds to a position of the elastic piece.

4. The battery pack according to claim 3, wherein the escape groove penetrates the main body portion in a thickness direction.

5. The battery pack of claim 2, wherein the spring comprises a first portion extending from a surface of the body portion toward the cell stack and a second portion extending from an edge of the first portion toward the body portion.

6. The battery pack of claim 5, wherein the angle between the second portion and the first portion is an obtuse angle.

7. The battery pack of any one of claims 1 to 6, wherein the elastic member is fixed to the surface of the limiting plate adjacent to the battery cell group by an adhesive layer.

8. The battery pack of any one of claims 1 to 6, wherein a surface of the limiting plate facing away from the cell stack is provided with a recess in which the strap portion is received.

9. The battery pack of any one of claims 1 to 6, further comprising a housing within which the battery cell stack is housed.

10. An inverted energy storage combination device comprising an inverter and a battery pack according to any one of claims 1 to 9, said battery pack being electrically connected to said inverter.