CN219350482U - Battery pack and battery pack - Google Patents

Abstract

The application discloses group battery and battery package, group battery include filling structure and a plurality of battery cell, and battery cell is arranged along at least one direction, and battery cell's lateral part has the chamber of holding, and filling structure holds in holding the intracavity, and filling structure's length and height match with battery cell, and the battery package includes the group battery. The filling structure is used for being placed in the box together with the battery cell, and the battery cell and the filling structure are arranged together to fill the placing space of the box, because the filling structure is matched with the length and the height of the battery cell, the battery cell and the box can be replaced to be matched, and the quantity of the battery cell can be increased or decreased according to the electric quantity requirement of the battery pack, so that the energy waste is reduced.

Description

Battery pack and battery pack

Technical Field

The application relates to the technical field of power batteries, in particular to a battery pack and a battery pack.

Background

The box of battery package has the space of placing that supplies the battery cell to arrange, and generally, the space of box is fixed, and under the condition that the electric quantity requirement to the battery package is not high, the space of placing of box is inconsistent with the required space of battery cell that forms required electric quantity, arranges full battery cell in the space of placing of box and then surpasses required electric quantity demand, causes the energy waste.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a battery pack, which can reasonably utilize the placement space of the box body and reduce energy waste.

The application also provides a battery pack with the battery pack.

A battery pack according to an embodiment of a first aspect of the present application includes:

the single batteries are arranged in a plurality, the single batteries are distributed along at least one direction, and the side part of at least one single battery is provided with a containing cavity;

and the filling structure is accommodated in the accommodating cavity, the length of the filling structure is equal to that of the single battery, and the height of the filling structure is equal to that of the single battery.

The battery pack according to the embodiment of the application has at least the following beneficial effects:

through setting up the space of placing of filling structure auxiliary unit cell filling box in this application, the space of placing of full box is arranged jointly to unit cell and filling structure, because filling structure and unit cell's length, thickness match can replace unit cell and box cooperation to can increase and decrease the quantity of unit cell according to the electric quantity demand of battery package, with the space of placing of rational utilization box, reduce the energy waste.

According to some embodiments of the present application, the battery pack comprises a plurality of arrangement units, a plurality of battery cells are arranged in at least one row, each row of battery cells forms one arrangement unit, the outer sides of the battery cells positioned at the end parts of the arrangement units are provided with accommodating cavities, and/or the accommodating cavities are defined between two adjacent battery cells in the arrangement units.

According to some embodiments of the present application, the filling structure comprises a support body arranged in a thickness direction of the filling structure.

According to some embodiments of the present application, the filling structure comprises a filling body, the inside of the supporting body is provided with a cavity, the filling body is located in the cavity, the filling body comprises a plurality of supporting walls, and edges of the supporting walls are connected with the supporting body.

According to some embodiments of the present application, the support body includes a bottom wall, a top wall and two first side walls, two ends of the first side walls are respectively connected with the bottom wall and the top wall, two first side walls are respectively connected with the bottom wall or two ends of the top wall, the first side walls are mutually perpendicular to the bottom wall, the first side walls are mutually perpendicular to the top wall, the bottom wall or the length of the top wall is equal to the length of the single battery, and the height of the first side walls is equal to the height of the single battery.

According to some embodiments of the application, at least one of the filling body, the top wall and the bottom wall is recessed inside the support body and forms a relief space.

According to some embodiments of the present application, the device further comprises at least one second side wall, two ends of the second side wall are respectively connected with the bottom wall and the top wall, and two sides of the second side wall are respectively connected with the two first side walls.

According to some embodiments of the application, the top wall has a mounting groove recessed toward the bottom wall for insertion of a connecting piece connected with the battery cell.

A battery pack according to an embodiment of a second aspect of the present application includes:

the battery pack of the embodiment of the first aspect;

the box, including bottom plate, two end plates and two curb plates, the end plate with the curb plate all connect in the top of bottom plate, two the end plate connect respectively in the both ends of curb plate, the both ends of end plate respectively with two the curb plate is connected, the end plate with the curb plate is in the top of bottom plate encloses and closes and form and place the space, group battery holding in place the space.

According to some embodiments of the present application, the end plate is provided with an explosion-proof valve, and the filling structure has an avoidance space, and the avoidance space is arranged towards the explosion-proof valve.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The application is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of one embodiment of a battery pack of the present application;

FIG. 2 is a schematic structural view of one embodiment of a filling structure of the present application;

FIG. 3 is a schematic view of another embodiment of a filling structure of the present application;

FIG. 4 is a schematic view of another embodiment of a filling structure of the present application;

FIG. 5 is a schematic view of another embodiment of a filling structure of the present application;

FIG. 6 is a schematic illustration of the mating of the filling structure with the connecting tab;

FIG. 7 is a schematic illustration of the fit of the filling structure, the cells and the connecting tabs;

FIG. 8 is a schematic view of an embodiment of a battery pack of the present application;

fig. 9 is a schematic structural view of an embodiment of the case of fig. 8.

Reference numerals:

the filling structure 100, the supporting body 110, the bottom wall 111, the top wall 112, the mounting groove 1121, the first side wall 113, the cavity 114, the second side wall 115, the filling body 120, the supporting wall 121, the first supporting wall 122, the second supporting wall 123, the third supporting wall 124, the avoiding space 130 and the mounting piece 140;

a receiving chamber 200;

a unit cell 300;

an arrangement unit 400;

the explosion-proof box comprises a box body 500, a bottom plate 510, an end plate 520, a side plate 530, a placing space 540, a baffle 550, a mounting cavity 560 and an explosion-proof valve 570;

and a connecting piece 600.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein equal or similar reference numerals refer to equal or similar elements or elements having equal or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that references to orientation descriptions, such as directions of up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical solution.

In the description of the present application, a description with reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to equivalent embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1, the application provides a battery pack, including if filling structure 100 and a plurality of battery cell 300, a plurality of battery cell 300 are arranged along at least one direction, the lateral part of battery cell 300 has and holds chamber 200, filling structure 100 holding is held in holding chamber 200, the length of filling structure 100 equals with the length of battery cell 300, the height of filling structure 100 equals with the height of battery cell 300, filling structure 100 can occupy the space that at least one battery cell 300 can occupy in the thickness direction of battery cell 300, filling structure 100 can set up side by side with battery cell 300 to place in the box together with battery cell 300, occupy the space of placing of box. Through setting up the space of placing of filling structure 100 supplementary battery cell 300 filling box, battery cell 300 and filling structure 100 arrange the space 540 of placing of full box jointly, because filling structure 100 and battery cell 300's length, thickness match can replace battery cell 300 and box cooperation to can increase and decrease battery cell 300's quantity according to the electric quantity demand of battery package, and carry out space filling through filling structure 100, with the space of placing of rational utilization box, reduce the energy waste.

In general, the unit cells 300 are arranged in at least one row (the arrangement direction along the thickness of the unit cells is a row), the unit cells 300 of each row form one arrangement unit 400, different arrangement units 400 are combined with each other to form a battery pack, the filling structure 100 may be located inside the arrangement unit 400 or at the end of the arrangement unit 400, when the receiving cavity 200 is located outside the unit cells 300 at the end of the arrangement unit 400 (outside the thickness direction of the unit cells 300), the receiving cavity 200 is located at the end of the arrangement unit 400, after the filling structure 100 is received in the receiving cavity 200, the receiving cavity 200 is located inside the arrangement unit 400 when the receiving cavity 200 is defined between two adjacent unit cells 300 in the arrangement unit 400, and after the filling structure 100 is received in the receiving cavity 200, the receiving cavity is arranged between the adjacent two unit cells 300.

In an embodiment of the present application, the filling structure 100 is disposed at the end of the arrangement unit 400, and since the filling structure 100 is not required to be connected with a signal acquisition element or connected with an acquisition board, the filling structure 100 is disposed at the end of the arrangement unit 400, the length of the acquisition board and the length of an isolation film used for coating the CCS can be shortened, and compared with the filling structure 100 disposed inside the arrangement unit 400, the acquisition board, the isolation film, and the like are not required to be interrupted, and the electrical elements in the battery pack can be disposed toward the central area, so that the arrangement of the electrical elements in the battery pack is facilitated, and the cost of the electrical elements can be reduced. In other embodiments, the filling structure 100 may be disposed inside the arrangement unit 400 to match the drain wire requirements of the battery pack.

In general, the unit cells 300 are arranged in a row along the thickness direction thereof to form the arrangement unit 400, the thickness of the filling structure 100 is not limited, and the size of the empty space in the case can be adjusted, and the accommodating chambers 200 in the arrangement unit 400 can be filled with the filling structure 100 having any thickness. When the plurality of unit cells 300 need to be reduced, the plurality of unit cells 300 can be located in the same arrangement unit 400 and adjacently arranged, and the filling of the missing space in the row can be completed by arranging one filling structure 100 in the same arrangement unit 400, so that the operation convenience is high. Of course, the filling manner of the filling structure 100 is not limited thereto, and the filling structure 100 may be disposed in different arrangement units 400 to improve the uniformity of the arrangement of the unit cells 300.

Adjacent unit cells 400 and adjacent unit cells 300 within each unit cell 400 may be connected by adhesion. The battery pack may include a plurality of arrangement units 400, the arrangement units 400 being sequentially arranged along the length direction of the unit cells 300 to form the battery pack, and the provision of the plurality of arrangement units 400 may improve the power supply amount of the battery pack. According to the electric quantity of the battery pack and the arrangement requirements of the single batteries 300, the accommodating cavities 200 can be arranged in different arrangement units 400, and the accommodating cavities 200 can be arranged in a plurality of positions and positioned at the end parts and inside the arrangement units 400.

In one embodiment, as shown in fig. 2, the filling structure 100 includes a support body 110, where the support body 110 is disposed along a thickness direction of the filling structure 110, the support body 110 can support the unit cells 300 adjacent to the support body in the thickness direction, and the unit cells 300 and the support body 110 provide rigid support to each other in the thickness direction, so that the battery pack forms a complete stress system in the thickness direction, and the overall structural strength of the battery pack is improved.

It should be noted that, the support body 110 has a hard structure to provide a stable hard support to the unit cell 300, so as to ensure the transmission of force in the thickness direction of the battery pack. In addition, after the battery pack is placed in the box body, the single battery 300 or the filling structure 100 adjacent to the end plate of the box body can transmit force along the thickness direction to the end plate, so that the effect of supporting and fixing the battery pack in the thickness direction by the end plate is achieved, and the overall structural strength of the battery pack is further improved.

In one embodiment, as shown in fig. 3, the supporting body 110 is a solid structure, and the side wall of the supporting body 110 in the thickness direction is a plane, and the plane is used for matching with the single battery 300, so as to realize mutual support between the supporting body 110 and the single battery 300. Since the side surface of the support body 110 is a plane, the support body 110 can support the unit cells 300 on the entire side surface, the support surface where the support body 110 and the unit cells 300 support each other is large, and the structural strength of the battery pack is high.

In another embodiment, as shown in fig. 2, the supporting body 110 is a hollow structure, the side surface of the supporting body 110 for supporting the single battery 300 is frame-shaped, and the side surface of the supporting body 110 is looped around the side portion of the single battery 300, so as to provide stable support for the single battery 300 in the thickness direction.

When the supporting body 110 is of a hollow structure, the whole weight is lighter, the effect of reducing the weight of the battery pack is achieved, meanwhile, compared with the supporting body 110 which is of a solid structure, the overall structural strength of the filling structure 100 is weaker, and therefore, in one embodiment of the utility model, the filling structure 100 further comprises the filling body 120, the supporting body 110 is internally provided with the cavity 114, the filling body 120 comprises a plurality of supporting walls 121, the edges of the supporting walls 121 are connected with the supporting body 110, the filling body 120 and the supporting body 110 form an integral structure, the structural strength of the filling structure 100 is improved, and when the supporting walls 121 are arranged in the thickness direction, the filling structure can be combined with the supporting body 110 to support the single battery 300, and the stability of the filling structure 100 on the single battery 300 is ensured.

In one embodiment, as shown in fig. 2, the supporting body 110 has a bottom wall 111, a top wall 112, and two first side walls 113, two ends of the first side walls 113 are respectively connected to the bottom wall 111 and the top wall 112, two first side walls 113 are respectively connected to two ends of the bottom wall 111 or the top wall 112, the first side walls 113 are perpendicular to the bottom wall 111, the first side walls 113 are perpendicular to the top wall 112, so that the bottom wall 111, the top wall 112 and the two first side walls 113 enclose a ring structure, and the filling structure 100 can occupy a cubic space because the bottom wall 111 and the top wall 112 are perpendicular to the first side walls 113. In addition, the length of the bottom wall 111 or the first side wall 113 is equal to the length of the single battery 300, and the height of the first side wall 113 is equal to the height of the single battery 300, so that the length of the filling structure 100 is equal to the length of the single battery 300, the height of the filling structure 100 is equal to the height of the single battery 300, and the filling structure 100 can occupy at least one space occupied by the single battery 300 in the thickness direction of the single battery 300.

The packing body 120 may include a plurality of support walls 121, and edges of the support walls 121 are connected with at least two of the bottom wall 111, the top wall 112, or the first side wall 113. The supporting wall 121 can support the bottom wall 111, the top wall 112 or the first side wall 113, and the filling body 120 and the supporting body 110 are combined to form a whole structure, so that the structural strength of the filling structure 100 is improved.

In one embodiment, two ends of the supporting wall 121 are respectively connected with the top wall 112 and the bottom wall 111, and the supporting wall 121 can support the supporting body 110 in the height direction of the filling structure 100, so that the stress margin of the filling structure 100 in the height direction is improved; in another embodiment, two ends of the supporting wall 121 are respectively connected to the two first side walls 113, or two ends of the supporting wall 121 are respectively connected to the two second side walls 115, and the supporting wall 121 can support the supporting body 110 in the thickness direction or the length direction of the filling structure 100, so as to improve the stress margin of the filling structure 100 in the length direction or the thickness direction.

Further, the different supporting walls 121 are disposed in different directions, and the supporting walls 121 can simultaneously support the supporting body 110 in different directions, so as to further improve the strength of the filling structure 100. Specifically, in one embodiment, referring to fig. 5, the filling body 120 includes a first supporting wall 122, a second supporting wall 123 and a third supporting wall 124, where the first supporting wall 122, the second supporting wall 123 and the third supporting wall 124 are perpendicular to each other, the first supporting wall 122, the second supporting wall 123 and the third supporting wall 124 are connected to the inner wall of the supporting body 110, the first supporting wall 122 is disposed along the length direction of the filling structure 100, the second supporting wall 123 is disposed along the thickness direction of the filling structure 100, and the third supporting wall 124 is disposed along the height direction of the filling structure 100, so that the bottom wall 111, the top wall 112, the first side wall 113 and the second side wall 115 of the supporting body 110 can be supported by the filling body 120, so that the filling structure 100 has higher structural strength.

In addition, the first supporting walls 122 may be disposed in plurality along the length direction of the filling structure 100, the second supporting walls 123 may be disposed in plurality along the thickness direction of the filling structure 100, the third supporting walls 124 may be disposed in plurality along the height direction of the filling structure 100, and the adjacent first supporting walls 122, the adjacent second supporting walls 123, and the adjacent third supporting walls 124 are spaced apart, so as to further improve the structural strength of the filling structure 100 and achieve a lightweight design of the filling structure 100.

In the embodiment of the application, the bottom wall 111, the top wall 112 and the first side wall 113 all have smooth surfaces, so that the bottom wall 111 can be stably placed in the box body, the top wall 112 can be assembled with other components in the battery pack in a matched mode, and the first side wall 113 can be attached to structures such as a partition plate 550 and a side plate in the battery pack, and the bonding strength is high.

In one embodiment, as shown in fig. 3, the supporting body 110 is a solid structure, the solid structure is in a block shape, a side surface of the solid structure is a first side wall 113, a top surface of the solid structure is a top wall 112, and a bottom surface of the solid structure is a bottom wall 111; because the supporting body 110 is of a solid structure, the supporting body 110 has high structural strength, is not easy to deform, and can be stably matched with the adjacent single battery 300 or other components in the battery pack all the time. In other embodiments, as shown in fig. 2, the top wall 112, one of the first side walls 113, the bottom wall 111, and the other side wall are connected end to end in sequence, and form a cavity 114 inside the support 110; the cavity 114 is provided in the support body 110, which plays a role in reducing the weight of the filling structure 100, so that the filling structure 100 is more portable on the premise of being capable of filling a space.

Further, as shown in fig. 3, the supporting body 110 further includes at least one second side wall 115, two ends of the second side wall 115 are respectively connected with the bottom wall 111 and the top wall 112, and two sides of the second bottom wall 111 are respectively connected with two first side walls 113, so that edges of the second side wall 115 are connected with the top wall 112, the bottom wall 111 and the first side walls 113, so that an area enclosed by the top wall 112, the bottom wall 111 and the first side walls 113 is closed, and the first side walls 113 and the second side walls 115 support the bottom wall 111 and the top wall 112 at the same time, so that the overall structural strength of the filling structure 100 can be improved.

It should be noted that the support body 110 having the second side wall 115 may have a solid structure or a hollow structure. When the supporting body 110 is in a solid structure, the first side wall 113 and the second side wall 115 are both side surfaces of the supporting body 110; when the supporting body 110 is in a hollow structure, the supporting body 110 is provided with a cavity 114, one second side wall 115 may be disposed, and one second side wall 115 seals one side of the supporting body 110 in the thickness direction of the filling structure 100, or two second side walls 115 are disposed, and two second side walls 115 respectively seal two sides of the supporting body 110 in the thickness direction of the filling structure 100.

Referring to fig. 4 and 5, at least one of the packing 120, the top wall 112, and the bottom wall 111 is recessed toward the inner wall of the support 110, and forms a relief space 130, and the relief space 130 is used for taking a place of other components in the battery pack or taking a place of installation of other components; for example, the explosion-proof valve arranged on the frame of the box body is kept away.

In one embodiment, only the packing 120 is recessed, and the escape space 130 is located at the center of the support 110; in other embodiments, as shown in fig. 4 and 5, the top wall 112 and the filling body 120 are both recessed, and the avoiding space 130 is located at the upper portion of the supporting body 110. The location of the avoidance space 130 on the filling structure 100 may be adjusted according to the desired avoidance requirements.

Generally, the bottom wall 111 of the filling structure 100 is placed on the bottom plate of the case, and the top wall 112 of the filling structure 100 is connected with other components in the battery pack, so that the filling structure 100 is matched with the other components, and in one embodiment of the present application, referring to fig. 4 to 7, the top wall 112 has a mounting groove 1121 concavely disposed toward the bottom wall 111, and the mounting groove 1121 is used for inserting the connection piece 600 connected with the adjacent unit battery 300. On the one hand, after the connecting piece 600 is inserted into the mounting groove 1121, the surface of the top wall 112 of the filling structure 100 is kept flat, so that other electrical components in the battery pack can be attached to the surface of the filling structure 100, and the battery pack has higher mounting convenience, on the other hand, the connecting piece 600 is usually connected to a pole on the top of the single battery 300, and the mounting groove 1121 is formed in the top wall 112, so that the connecting piece 600 can be conveniently connected with the adjacent single battery 300 and the filling structure 100, and the arrangement of the electrical components is convenient.

The tab 600 may be secured to the top wall 112 by adhesive, threaded fastening. In one embodiment, the filling structure 100 further comprises a mounting member 140, at least a portion of the mounting member 140 being located inside the support body 110, the mounting member 140 being adapted to be connected to the connection piece 600; the mounting member 140 provides a mounting location for the connection tab 600 to facilitate connection of the connection tab 600 to the filling structure 100. The mounting member 140 may be a threaded fastener, such as a nut, and the fastening connection between the connecting piece 600 and the mounting member 140 can be achieved by locking a screw into the two, so that the assembly convenience is high.

Additionally, in one embodiment, the mounting member 140 is positioned entirely within the support body 110, with the top surface of the mounting member 140 being flush with the top surface of the top wall 112 to maintain the surface of the filling structure 100 flat. In addition, the mounting member 140 can be integrally formed in the supporting body 110 by injection molding, and the filling structure 100 has a connecting position for connecting the connecting piece 600 after being formed, so that no hole is formed on the top wall 112, and the processing convenience is high.

As shown in fig. 8 and 9, the embodiment of the present application further provides a battery pack, which includes the battery pack described above, and further includes a case 500, where the battery pack is placed in the case 500. Specifically, the case 500 includes a bottom plate 510, two end plates 520 and two side plates 530, the end plates 520 and the side plates 530 are all connected to the top of the bottom plate 510, the two end plates 520 are respectively connected to two ends of the side plates 530, two ends of the end plates 520 are respectively connected to the two side plates 530, the end plates 520 and the side plates 530 enclose above the bottom plate 510 to form a placement space 540, and the battery pack is accommodated in the placement space 540.

It should be noted that, when the filling structure 100 is located at the end of the arrangement unit 400 and is just adjacent to the end plate 520, the filling structure 100 can transmit the thrust generated by the working expansion of the unit battery 300 to the end plate 520, and the two end plates 520 and the arrangement unit 400 form a stress system, so that the unit battery 300 can be prevented from being excessively expanded, and the electricity safety of the battery pack is ensured.

As shown in fig. 9, a plurality of separators 550 are disposed between the side plates 530, two ends of each separator 550 are respectively connected with two end plates 520, so that the structural strength of the case 500 can be improved, the placement space 540 is divided into a plurality of mounting cavities 560 by the separators 550, each mounting cavity 560 can be placed into one arrangement unit 400, the separators 550 are located between adjacent arrangement units 400, and the fixing structure of the arrangement units 400 is achieved by gluing, so that the battery pack is stably placed in the case 500.

In addition, the end plate 520 is further provided with an explosion-proof valve 570, the support body 110 is provided with an avoidance space 130, the avoidance space 130 is arranged towards the explosion-proof valve 570, and the avoidance space 130 can avoid the installation of the explosion-proof valve 570 and the action of the explosion-proof valve 570, so that the battery pack has higher installation convenience.

The embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the present application and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A battery pack, comprising:

the single batteries are arranged in a plurality, the single batteries are distributed along at least one direction, and the side part of at least one single battery is provided with a containing cavity;

and the filling structure is accommodated in the accommodating cavity, the length of the filling structure is equal to that of the single battery, and the height of the filling structure is equal to that of the single battery.

2. The battery pack according to claim 1, comprising a plurality of arrangement units, wherein a plurality of the unit cells are arranged in at least one row, wherein each row of the unit cells forms one arrangement unit, wherein the accommodation chamber is provided outside the unit cells at the end of the arrangement unit, and/or wherein the accommodation chamber is defined between two adjacent unit cells in the arrangement unit.

3. The battery pack according to claim 1, wherein the filling structure includes a support body disposed in a thickness direction of the filling structure.

4. A battery according to claim 3, wherein the filling structure comprises a filling body, the support body having a cavity inside, the filling body being located in the cavity, the filling body comprising a number of support walls, the edges of the support walls being connected to the support body.

5. The battery pack according to claim 4, wherein the support body comprises a bottom wall, a top wall and two first side walls, two ends of the first side walls are respectively connected with the bottom wall and the top wall, two first side walls are respectively connected with two ends of the bottom wall or the top wall, the first side walls are mutually perpendicular to the bottom wall, the first side walls are mutually perpendicular to the top wall, the length of the bottom wall or the top wall is equal to the length of the single battery, and the height of the first side walls is equal to the height of the single battery.

6. The battery of claim 5, wherein at least one of the filler, the top wall, and the bottom wall is recessed into the support body and forms a relief space.

7. The battery of claim 5, further comprising at least one second side wall, wherein two ends of the second side wall are connected to the bottom wall and the top wall, respectively, and two sides of the second side wall are connected to two of the first side walls, respectively.

8. The battery pack of claim 5, wherein the top wall has a mounting groove recessed toward the bottom wall for insertion of a connecting tab connected to the battery cell.

9. A battery pack, comprising:

the battery pack of any one of claims 1 to 8;

the box, including bottom plate, two end plates and two curb plates, the end plate with the curb plate all connect in the top of bottom plate, two the end plate connect respectively in the both ends of curb plate, the both ends of end plate respectively with two the curb plate is connected, the end plate with the curb plate is in the top of bottom plate encloses and closes and form and place the space, group battery holding in place the space.

10. The battery pack of claim 9, wherein the end plate is mounted with an explosion-proof valve, and the filling structure has an escape space disposed toward the explosion-proof valve.

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