CN217009343U

CN217009343U - Battery pack

Info

Publication number: CN217009343U
Application number: CN202220830713.0U
Authority: CN
Inventors: 王帅锋; 杨绪龙; 蒋昕玮
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-07-19
Anticipated expiration: 2032-04-11

Abstract

The utility model relates to the technical field of batteries and provides a battery pack. The battery pack includes: a battery case; the first battery is arranged in the battery box body and comprises a first stacking surface, and the first stacking surface comprises a first edge area and a first middle area; the second battery is arranged in the battery box body and comprises a second stacking surface, and the second stacking surface comprises a second edge area and a second middle area; the battery pack is characterized in that at least one part of the first edge area is opposite to the second edge area, at least one part of the first middle area is opposite to the second middle area, and a gap is formed between at least one part of the first edge area and the second edge area, so that the extrusion force between the first battery and the second battery is avoided, and after the battery pack is used for a long time, the gap between the first battery and the second battery can provide a space for the expansion of the batteries, so that the service life of the battery pack is prolonged, and the performance of the battery pack is improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

In the related art, the battery pack may include a plurality of batteries, and a pre-compression may be formed between the batteries during the process of mounting the batteries in the battery case, that is, a pressing force may exist between the batteries.

However, after a battery pack is used for a long time, the batteries swell, and the pressing force between the large surfaces of the adjacent batteries becomes greater, thereby affecting the life of the batteries.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack to improve the performance of the battery pack.

The present invention provides a battery pack, including:

a battery case;

the first battery is arranged in the battery box body and comprises a first stacking surface, the first stacking surface comprises a first edge area and a first middle area, and the first edge area is arranged around the first middle area;

the second battery is arranged in the battery box body and is adjacent to the first battery, the second battery comprises a second stacking surface, the second stacking surface comprises a second edge area and a second middle area, and the second edge area is arranged around the second middle area;

the first stacking surface and the second stacking surface are arranged directly opposite to each other, so that at least part of the first edge area and the second edge area are arranged directly opposite to each other, at least part of the first middle area and the second middle area are arranged directly opposite to each other, and a gap is formed between at least part of the first edge area and the second edge area.

The battery pack comprises the battery box body, the first battery and the second battery, wherein the first battery and the second battery are arranged in the battery box body, and other parts are not arranged between the first battery and the second battery which are adjacently arranged, so that a gap can be ensured to be formed between the first battery and the second battery, namely, the gap can be formed between the first battery and the second battery in the process of assembling the first battery and the second battery, so that the extrusion force between the first battery and the second battery is avoided, and therefore, after the battery pack is used for a long time, the gap between the first battery and the second battery can provide a space for the expansion of the batteries, so that the service life of the battery pack is prolonged, and the performance of the battery pack is improved.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a schematic diagram illustrating a structure of a battery pack according to an exemplary embodiment;

FIG. 2 is an exploded schematic view of a battery pack according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a mating structure of a battery pack according to an exemplary embodiment;

fig. 4 is a schematic structural view showing a first battery of a battery pack according to a first exemplary embodiment;

fig. 5 is a schematic structural view showing a first battery of a battery pack according to a second exemplary embodiment;

fig. 6 is a schematic structural view showing a first battery of a battery pack according to a third exemplary embodiment;

fig. 7 is a schematic structural view showing a first battery of a battery pack according to a fourth exemplary embodiment;

fig. 8 is a schematic diagram illustrating a second battery of a battery pack according to an exemplary embodiment;

fig. 9 is a schematic structural view showing a first battery of a battery pack according to a fifth exemplary embodiment;

fig. 10 is a flow chart illustrating a method of assembling a battery pack according to an exemplary embodiment.

The reference numerals are illustrated below:

1. a gap; 10. a battery case; 20. a first battery; 21. a first stacking surface; 211. a first edge region; 2111. a first segment; 2112. a second segment; 212. a first intermediate region; 22. a first pole assembly; 23. a second recess; 24. a surrounding surface; 25. a transition surface; 30. a second battery; 31. a second stacking face; 311. a second edge region; 312. a second intermediate region; 32. a first recess; 33. a second pole post assembly; 40. a bus bar; 50. fixing a bracket; 60. and a third battery.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood as a specific case by a person skilled in the art.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery pack, referring to fig. 1 to 8, the battery pack includes: a battery case 10; a first battery 20, the first battery 20 being disposed in the battery case 10, the first battery 20 including a first stacking surface 21, the first stacking surface 21 including a first edge region 211 and a first middle region 212, the first edge region 211 being disposed around the first middle region 212; a second cell 30, the second cell 30 being disposed in the cell case 10 and being adjacent to the first cell 20, the second cell 30 including a second stacking surface 31, the second stacking surface 31 including a second edge region 311 and a second middle region 312, the second edge region 311 being disposed around the second middle region 312; the first stacking surface 21 and the second stacking surface 31 are directly opposite to each other, so that at least a portion of the first edge region 211 and the second edge region 311 are directly opposite to each other, at least a portion of the first middle region 212 and the second middle region 312 are directly opposite to each other, and a gap 1 is formed between at least a portion of the first edge region 211 and the second edge region 311.

The battery pack of one embodiment of the utility model comprises a battery box body 10, a first battery 20 and a second battery 30, wherein the first battery 20 and the second battery 30 are arranged in the battery box body 10, and no other component is arranged between the first battery 20 and the second battery 30 which are adjacently arranged, so that a gap 1 can be ensured between the first battery 20 and the second battery 30, namely, the gap 1 can be formed between the first battery 20 and the second battery 30 in the process of assembling the first battery 20 and the second battery 30, so that the pressing force formed between the first battery 20 and the second battery 30 is avoided, and therefore, after the battery pack is used for a long time, the gap 1 between the first battery 20 and the second battery 30 can provide a space for the battery to expand, so that the service life of the battery pack is prolonged, and the performance of the battery pack is improved.

The first cell 20 includes a first stacking surface 21, the second cell 30 includes a second stacking surface 31, and the first stacking surface 21 is disposed directly opposite to the second stacking surface 31, i.e., the stacking direction of the first cell 20 and the second cell 30 is substantially perpendicular to the first stacking surface 21 and the second stacking surface 31.

The first stacking surface 21 is disposed directly opposite to the second stacking surface 31, i.e., no third component, such as a cushion pad, a cushion bracket, etc., is disposed between the first stacking surface 21 and the second stacking surface 31. However, the first stacking surface 21 and the second stacking surface 31 are directly opposite to each other, which does not exclude that some structures are formed between the first stacking surface 21 and the second stacking surface 31 due to assembly during the process of fixing the first battery 20 and the second battery 30 in the battery case 10, for example, a part of the adhesive is formed between the first stacking surface 21 and the second stacking surface 31 due to overflow during the process of attaching the first battery 20 and the second battery 30 to the battery case 10 by the adhesive, but this structure is formed due to improper operation or unavailability during assembly and is not a specially provided third member, and therefore, this case is also included in the embodiment in which the first stacking surface 21 and the second stacking surface 31 are directly opposite to each other. The first stacking surface 21 and the second stacking surface 31 are directly opposite to each other, and it is important to note that a third member is not specifically disposed between the first stacking surface 21 and the second stacking surface 31, but other structures are not excluded from being formed in the assembling process.

As shown in fig. 4 to 8, the first stacking surface 21 includes a first edge region 211 and a first middle region 212, the first edge region 211 is disposed around the first middle region 212, the second stacking surface 31 includes a second edge region 311 and a second middle region 312, the second edge region 311 is disposed around the second middle region 312, the first stacking surface 21 is disposed directly opposite to the second stacking surface 31, so that at least a portion of the first edge region 211 is disposed opposite to the second edge region 311, and at least a portion of the first middle region 212 is disposed opposite to the second middle region 312, so that the first battery 20 and the second battery 30 can be grouped, and the space utilization rate of the battery case 10 is improved.

As shown in fig. 4 and 8, the area of the first stacking surface 21 may be equal to the area of the second stacking surface 31, for example, the circumferential edge of the first stacking surface 21 and the circumferential edge of the second stacking surface 31 form a rectangle, in which case the first middle region 212 is a rectangle and the first edge region 211 is a rectangle ring, i.e. formed by splicing four rectangles; correspondingly, the second middle region 312 is a substantially rectangular body, and the second edge region 311 is a substantially rectangular ring, i.e. formed by splicing four rectangular bodies, so that the first edge region 211 is directly opposite to the second edge region 311, and the first middle region 212 is directly opposite to the second middle region 312.

As shown in fig. 5 to 8, the area of the first stacking surface 21 may not be equal to the area of the second stacking surface 31, for example, a recess is provided on the side of the first cell 20 facing the second cell 30, so that the area of the first stacking surface 21 may be smaller than the area of the second stacking surface 31. For example, as shown in conjunction with fig. 5 and 8, the recess is a substantially rectangular recess, in which case the first middle region 212 is a substantially first rectangular body and the first edge region 211 is a substantially first rectangular ring; accordingly, second intermediate region 312 is a substantially rectangular body, and second edge region 311 is a substantially rectangular ring, such that a portion of first edge region 211 is disposed directly opposite second edge region 311, another portion of first edge region 211 is disposed directly opposite second intermediate region 312, and first intermediate region 212 is disposed directly opposite second intermediate region 312.

It should be noted that, during the use of the battery pack, the first battery 20 and the second battery 30 may expand, and at this time, the amount of expansion of the first middle region 212 and the second middle region 312 may be larger than that of the first edge region 211 and the second edge region 311, so that, even if there is a gap 1 between the first battery 20 and the second battery 30 during the installation process, the first middle region 212 and the second middle region 312 are most likely to contact each other, and the amount of expansion of the first edge region 211 and the second edge region 311 is relatively smaller, so that there is still a gap 1 between at least a part of the first edge region 211 and the second edge region 311.

In certain embodiments, all of the first edge regions 211 may have a gap 1 between all of the second edge regions 311.

In some embodiments, a portion of the first edge region 211 may have a gap 1 with a portion of the second edge region 311.

In some embodiments, all of the first intermediate regions 212 may have a gap 1 between all of the second intermediate regions 312.

In some embodiments, portions of the first intermediate region 212 may have a gap 1 between portions of the second intermediate region 312.

In some embodiments, all of first intermediate region 212 may be in contact with all of second intermediate region 312.

It should be noted that, as the usage time of the battery pack increases, the amount of swelling of the first battery 20 and the second battery 30 may be larger, and therefore, even if the gap 1 is formed between the first battery 20 and the second battery 30 during the assembly process, and as the usage time of the battery pack increases, the gap 1 between the first battery 20 and the second battery 30 may gradually decrease, for example, a portion of the first middle region 212 may gradually come into contact with a portion of the second middle region 312 with a gap therebetween, and on the basis of further increase of the usage time, the entirety of the first middle region 212 may come into contact with the entirety of the second middle region 312, but during this process, since the first edge region 211 and the second edge region 311 are located at the edge regions of the first battery 20 and the second battery 30, respectively, at this time, the amount of swelling generated by the first edge region 211 and the second edge region 311 may be relatively smaller, alternatively, in certain extreme cases it is not excluded that the first edge region 211 and the second edge region 311 do not expand, so that there will still be a gap 1 between at least part of the first edge region 211 and the second edge region 311.

In one embodiment, as shown in fig. 4 to 7, the first edge region 211 includes two first segment bodies 2111 and two second segment bodies 2112 which are opposite to each other, two ends of the first segment bodies 2111 are respectively connected to the two second segment bodies 2112, the first segment bodies 2111 extend along the length direction D1 of the first battery 20, and at least part of the second segment bodies 2112 extend along the width direction D2 of the first battery 20; in which a gap 1 is formed between at least a portion of the first segment 2111 and the second edge region 311, that is, a gap 1 is formed between the first battery 20 and the second battery 30 along the length direction of the first battery 20 and the second battery 30.

In one embodiment, there is a gap 1 between at least a portion of the second segment 2112 and the second edge region 311, i.e., the amount of expansion of the second segment 2112 in the width direction of the first edge region 211 may be relatively small.

The length of the first segment 2111 in the length direction of the first edge region 211 is greater than the length of the second segment 2112 in the width direction of the first edge region 211, and the expansion amount of the first battery 20 and the second battery 30 of the battery pack is greater as the usage time of the battery pack increases, but a gap 1 is still formed between at least a part of the first segment 2111 and the second edge region 311.

As shown in fig. 4, the first stack plane 21 is formed by the first cell 20 on the side facing the second cell 30, in this case, the first stack plane 21 includes a first edge region 211 and a first middle region 212, the first edge region 211 includes two first segments 2111 and two second segments 2112 which are opposite to each other, and the first segments 2111 have a first rectangular structure and the second segments 2112 have a second rectangular structure, and the first segments 2111 and the second segments 2112 are divided as shown in fig. 4.

As shown in fig. 5, a side portion of the first cell 20 facing the second cell 30 forms a first stacked surface 21, in this case, the first stacked surface 21 includes a first edge region 211 and a first middle region 212, the first edge region 211 includes two first segment bodies 2111 and two second segment bodies 2112 which are opposite to each other, and the first segment bodies 2111 have a first rectangular structure and the second segment bodies 2112 have a second rectangular structure, and the first segment bodies 2111 and the second segment bodies 2112 are divided as shown in fig. 5.

As shown in fig. 6, a side portion of the first cell 20 facing the second cell 30 forms a first stacked surface 21, in this case, the first stacked surface 21 includes a first edge region 211 and a first middle region 212, the first edge region 211 includes two first segments 2111 and two second segments 2112 which are opposite to each other, and the first segments 2111 have a first rectangular structure and the second segments 2112 have a U-shaped structure, and the first segments 2111 and the second segments 2112 are divided as shown in fig. 6.

As shown in fig. 7, a side portion of the first cell 20 facing the second cell 30 forms a first stacked surface 21, in this case, the first stacked surface 21 includes a first edge region 211 and a first middle region 212, the first edge region 211 includes two first segments 2111 and two second segments 2112 which are opposite to each other, and the first segments 2111 have a first rectangular structure and the second segments 2112 have a substantially L-shaped structure, and the first segments 2111 and the second segments 2112 are divided as shown in fig. 7.

It should be noted that, for the specific structural form of the second stacking surface 31 of the second cell 30, details are not described here, and reference may be made to the specific structural form of the first stacking surface 21 of the first cell 20.

In one embodiment, the first section 2111 is substantially planar, i.e., the first section 2111 is substantially planar regardless of manufacturing tolerances or mounting variations. During the use of the first battery 20, the expansion amount of the first edge region 211 may be small, or the expansion amount of the first edge region 211 may be substantially zero, so that the first segment body 2111 may maintain the original structural configuration, i.e., the first segment body 2111 may maintain the first plane state.

In one embodiment, the second segment 2112 is substantially planar, i.e., the second segment 2112 is planar regardless of manufacturing tolerances or mounting distortions. During the use of the first battery 20, the expansion amount of the first edge region 211 may be small, or the expansion amount of the first edge region 211 may be substantially zero, so that the second segment 2112 may maintain the original structural configuration, i.e., the second segment 2112 may maintain the second plane state.

In one embodiment, the size of the gap 1 is in the range of 0.2mm to 1mm, which can ensure the space utilization rate of the battery pack on the basis of providing a certain amount of expansion between the first battery 20 and the second battery 30, thereby ensuring the energy density of the battery pack.

In the assembly process of the first battery 20 and the second battery 30, if the installation error and the manufacturing error are neglected, at this time, the first battery 20 and the second battery 30 basically have the gap 1 of 0.2mm to 1mm at each position, that is, the gap 1 of 0.2mm to 1mm is provided between the first stacking surface 21 and the second stacking surface 31, the gap 1 of 0.2mm to 1mm is provided between the first edge region 211 and the second edge region 311, the gap 1 of 0.2mm to 1mm is provided between the first middle region 212 and the second middle region 312, and as the first battery 20 and the second battery 30 are used, the gap 1 between the first middle region 212 and the second middle region 312 is gradually eliminated, the existence of the gap 1 can improve enough buffer space, and after the first middle region 212 and the second middle region 312 are contacted, the first battery 20 and the second battery 30 can also have the effect of fixing each other, thereby securing the fixing effect of the first and

second batteries

20 and 30.

In one embodiment, the size of the gap 1 is in the range of 0.4mm to 0.6mm, which can ensure the energy density of the battery pack on the basis of providing a certain amount of expansion between the first battery 20 and the second battery 30, thereby improving the performance of the battery pack.

In some embodiments, the gap 1 may have a dimension of 0.2mm, 0.21mm, 0.25mm, 0.3mm, 0.4mm, 0.41mm, 0.42mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.61mm, 0.65mm, 0.7mm, 0.8mm, 0.9mm, 0.92mm, 0.95mm, 0.98mm, 0.99mm, or 1mm, among others.

In one embodiment, the first intermediate region 212 is not in contact with the second intermediate region 312, that is, there is a gap 1 between the first intermediate region 212 and the second intermediate region 312, for example, there is a gap 1 between the first intermediate region 212 and the second intermediate region 312 after the battery pack is assembled, or, before the battery pack is used, the expansion amount of the first intermediate region 212 and the second intermediate region 312 is smaller, and there is a gap 1 between the first intermediate region 212 and the second intermediate region 312.

In one embodiment, at least a portion of first intermediate region 212 is in direct contact with second intermediate region 312, i.e., there is no gap 1 between first intermediate region 212 and second intermediate region 312, for example, after a battery pack is used for a long time, the expansion amount of first intermediate region 212 and second intermediate region 312 is larger, gap 1 between first intermediate region 212 and second intermediate region 312 is gradually reduced, and finally, gap 1 between first intermediate region 212 and second intermediate region 312 may be completely eliminated.

In one embodiment, the area of the first edge region 211 and the area of the second edge region 311 are substantially equal, and the area of the first middle region 212 and the area of the second middle region 312 are substantially equal.

As shown in fig. 4 and 8, the first stacking surface 21 and the second stacking surface 31 are directly opposite to each other, and the area of the first stacking surface 21 and the area of the second stacking surface 31 coincide with each other regardless of manufacturing errors and mounting deformations of the first cell 20 and the second cell 30, so that the area of the first edge region 211 and the area of the second edge region 311 can be made substantially equal, the area of the first intermediate region 212 and the area of the second intermediate region 312 can be made substantially equal, and the gap 1 between the first edge region 211 and the second edge region 311 can be maintained at all times, and accordingly, the gap 1 between the first intermediate region 212 and the second intermediate region 312 can be gradually eliminated.

In one embodiment, as shown in fig. 3, the first cell 20 includes a first pole assembly 22, the first pole assembly 22 is disposed at the first stacking surface 21, the second cell 30 includes a first recess 32, the first recess 32 is disposed toward the first stacking surface 21, a portion of the first pole assembly 22 is located within the first recess 32; wherein the first recess 32 is located outside the range of the second stacking surface 31, and the area of the first stacking surface 21 is larger than that of the second stacking surface 31.

The area of the first stacking surface 21 is larger than the area of the second stacking surface 31, the side of the second cell 30 facing the first stacking surface 21 has a first recess 32, and the sum of the bottom wall of the first recess 32 and the area of the second stacking surface 31 may be equal to the area of the first stacking surface 21. By positioning the part of the first pole assembly 22 in the first recess 32, the first recess 32 can avoid the first pole assembly 22, so that the first battery 20 and the second battery 30 can be conveniently arranged in the battery box 10, and the arrangement of the battery pack is not affected by the arrangement position of the first pole assembly 22.

In one embodiment, as shown in fig. 5 to 7, the first battery 20 includes a first pole assembly 22 and a second recess 23, the first pole assembly 22 is disposed in the second recess 23, the second recess 23 is disposed toward the second battery 30, and the second recess 23 is located outside the range of the first stacking surface 21.

As shown in fig. 5 and 8 in conjunction, the area of the first stacking surface 21 is smaller than the area of the second stacking surface 31, the side of the first cell 20 facing the second stacking surface 31 has the second recess 23, and the sum of the bottom wall of the second recess 23 and the area of the first stacking surface 21 may be equal to the area of the second stacking surface 31. By disposing the first post assembly 22 in the second recess 23, the first post assembly 22 can be prevented from protruding the first stacking surface 21, so as to ensure that the first battery 20 and the second battery 30 can be conveniently disposed in the battery case 10, and the arrangement of the battery pack is not affected by the disposition of the first post assembly 22.

In one embodiment, the battery pack further includes a conductive connecting member, the conductive connecting member is connected to the first battery 20, and the conductive connecting member is connected to the second battery 30 to fix the first battery 20 and the second battery 30, so that it can be ensured that the first battery 20 and the second battery 30 can be further fixed by the conductive connecting member, and it can be ensured that the first battery 20 and the second battery 30 can be reliably fixed in the battery box 10.

The conductive connector may include a circuit board, and the circuit board may include a voltage collecting portion, a temperature collecting portion, and the like, and at this time, the circuit board may be connected to the first battery 20 and the second battery 30, for example, one voltage collecting portion of the circuit board may be directly connected to the first battery 20, and the other voltage collecting portion of the circuit board may be directly connected to the second battery 30, and the position of the circuit board is relatively fixed, for example, the circuit board may be fixed on the battery box 10, and at this time, the first battery 20 and the second battery 30 may be fixed on the battery box 10 through the circuit board, so as to ensure that the first battery 20 and the second battery 30 can be reliably fixed in the battery box 10.

In one embodiment, as shown in fig. 3, the conductive connector includes a bus bar 40, the bus bar 40 is connected with the first battery 20, and the bus bar 40 is connected with the second battery 30, so that the first battery 20 and the second battery 30 can be fixed by the bus bar 40, and the first battery 20 and the second battery 30 can be ensured to have a relatively fixed position.

As shown in fig. 3, two ends of the bus bar 40 may be connected to the first pole assembly 22 of the first battery 20 and the second pole assembly 33 of the second battery 30, respectively, the bus bar 40 may electrically connect the first battery 20 and the second battery 30, and the bus bar 40 may limit the position of the first battery 20 and the second battery 30, so as to ensure that the first battery 20 and the second battery 30 have relatively fixed positions. Further, the first pole assembly 22 and the second pole assembly 33 may be disposed at the ends of the first battery 20 and the second battery 30, the first pole assembly 22 may be disposed at a first edge region 211 of the first stacking surface 21, the second pole assembly 33 may be disposed at an edge region of the other stacking surface of the second battery 30 opposite to the second stacking surface 31, and the expansion amount of the edge region may be substantially zero, so that the position between the first pole assembly 22 and the second pole assembly 33 is relatively fixed, thereby enabling the bus bar 40 to be reliably connected to the first pole assembly 22 and the second pole assembly 33, and thus enabling the first battery 20 and the second battery 30 to have relatively fixed positions.

It should be noted that the bus bar can connect more than three batteries, and the bus bar can be fixed on the battery box 10, so that the bus bar can fix each battery, thereby ensuring that each battery is reliably fixed on the battery box 10.

It should be noted that the first pole assembly of the first battery 20 and the second pole assembly of the second battery 30 may also be disposed at the top ends of the first battery 20 and the second battery 30, respectively, which is not limited herein, and the corresponding battery type may be selected according to actual requirements.

In one embodiment, the first battery 20 is adhered to the battery case 10, and the second battery 30 is adhered to the battery case 10, which not only facilitates connection, but also ensures that the first battery 20 and the second battery 30 are reliably fixed to the battery case 10.

In one embodiment, as shown in fig. 2, the battery case 10 is provided with a fixing bracket 50, the fixing bracket 50 is connected with the first battery 20, and the fixing bracket 50 is connected with the second battery 30, so that the first battery 20 and the second battery 30 can be reliably fixed on the battery case 10 by the fixing bracket 50.

The first battery 20 and the second battery 30 can be adhered to the fixing bracket 50, the first battery 20 and the second battery 30 can be clamped on the fixing bracket 50, and the first battery 20 and the second battery 30 can be installed in the battery case 10 after being installed on the fixing bracket 50, so that not only is the organization convenient, but also the first battery 20 and the second battery 30 can be reliably fixed on the battery case 10 through the fixing bracket 50.

In one embodiment, as shown in fig. 1 and 2, the battery pack further includes a third battery 60, the third battery 60 is disposed in the battery box 10, the fixing bracket 50 is detachably disposed with the battery box 10, and the fixing bracket 50 is not fixedly connected with the third battery 60, so as to prevent the third battery 60 from blocking the first battery 20 and the second battery 30 from being removed from the battery box 10 simultaneously with the fixing bracket 50, so that the first battery 20 and the second battery 30 can be removed separately, thereby facilitating the maintenance of the battery pack.

It should be noted that, the first battery 20 and the second battery 30 are fixed to the fixing bracket 50, and the fixing bracket 50 is detachably disposed in the battery box 10, so that the first battery 20 and the second battery 30 can be stably disposed in the battery box 10, and the problem that the first battery 20 and the second battery 30 shake when the battery pack is normally used is avoided. When at least one of the first battery 20 and the second battery 30 is maintained, the fixing bracket 50 may be disconnected from the battery case 10, so that the fixing bracket 50 is detached from the battery case 10, the first battery 20 and the second battery 30 may be taken out from the battery case 10, and subsequent maintenance may be performed, for example, at least one of the first battery 20 and the second battery 30 on the fixing bracket 50 may be detached, at least one of the first battery 20 and the second battery 30 that is replaced may be mounted on the original fixing bracket 50, and the fixing bracket 50 may be mounted on the battery case 10 subsequently. Alternatively, the first battery 20, the second battery 30, and the fixing bracket 50 are directly replaced with new ones and mounted to the battery case 10.

The first battery 20, the second battery 30 and the fixing bracket 50 may not be fixedly connected to the third battery 60, so that when the fixing bracket 50 is detached from the battery box 10, the third battery 60 does not prevent the first battery 20 and the second battery 30 from being detached from the battery box 10 simultaneously with the fixing bracket 50.

In one embodiment, as shown in fig. 2, the battery pack further includes another fixing bracket 50, the fixing bracket 50 is detachably disposed in the battery box 10, and the third battery 60 is fixed to the fixing bracket 50 to be disposed in the battery box 10 through the fixing bracket 50, so that the third battery 60 and the fixing bracket 50 can be simultaneously removed from the battery box 10, thereby facilitating the maintenance of the battery pack. The third battery 60 is plural, and a gap may be formed between adjacent third batteries 60.

It should be noted that, other batteries may be disposed on the fixing bracket 50 to which the first battery 20 and the second battery 30 are fixed, and the arrangement manner between the other adjacent batteries may refer to the arrangement manner of the first battery 20 and the second battery 30. Accordingly, the fixing bracket 50 to which the third battery 60 is fixed may be provided with other batteries. Only a part of the battery case 10 is shown in fig. 1 and 2, the battery case 10 may further include a bottom plate, a top cover, and the like, which are not limited herein, and the battery case 10 shown in fig. 1 and 2 may be regarded as a frame structure.

In one embodiment, the first battery 20, the second battery 30, and the third battery 60 are all quadrangular prismatic batteries, so that the internal space of the battery case 10 can be maximally utilized to meet the energy demand. The battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode can be interchanged. The first battery 20, the second battery 30, and the third battery 60 may be identical. The battery pack may further include other batteries, and the number of the batteries is not limited herein.

The first battery 20, the second battery 30, and the third battery 60 are all quadrangular prism batteries, that is, the first battery 20, the second battery 30, and the third battery 60 are substantially square batteries. The prismatic cell may comprise six surfaces, and two adjacent surfaces may be directly connected with each other, that is, no transition surface may be disposed between two adjacent surfaces, and further, the edges of two adjacent surfaces may be considered to be directly connected with each other, and two adjacent surfaces are disposed vertically. The square battery may include six surfaces and a plurality of transition surfaces, that is, two adjacent surfaces may be connected by the transition surfaces, and the transition surfaces may be curved surfaces, and further, the transition surfaces may be circular arc surfaces.

Taking the first battery 20 as an example, as shown in fig. 9, the first battery 20 further includes a surrounding surface 24, the surrounding surface 24 is disposed adjacent to the first stacking surface 21, a transition surface 25 is disposed between the surrounding surface 24 and the first stacking surface 21, and the transition surface 25 is a curved surface, so that the corners of the first battery 20 can have arc-shaped transitions, thereby avoiding the formation of right-angled corners. The number of the surrounding surfaces 24 may be four, and the first stacking surface 21 and the one surrounding surface 24 have a transition surface 25 therebetween, i.e. the transition surface 25 does not belong to the first stacking surface 21 and the surrounding surface 24. The second battery 30 may be identical to the first battery 20 and will not be described in detail herein.

An embodiment of the present invention also provides an assembling method of a battery pack, as shown in fig. 10, including: and S101, adjacently mounting the first battery 20 and the second battery 30 to the battery case 10 along a battery stacking direction of the battery pack, wherein a gap 1 is formed between the first battery 20 and the second battery 30 which are directly opposite to each other, so as to prevent pre-stress from being formed between the first battery 20 and the second battery 30, and the battery stacking direction is perpendicular to the large surfaces of the first battery 20 and the second battery 30.

According to the method for assembling the battery pack, the first battery 20 and the second battery 30 are adjacently installed on the battery box body 10, the first battery 20 and the second battery 30 are directly opposite to each other, namely, other parts are not arranged between the first battery 20 and the second battery 30 which are adjacently arranged, so that a gap 1 can be ensured between the first battery 20 and the second battery 30, prepressing during installation of the first battery 20 and the second battery 30 can be avoided, and after the battery pack is used for a long time, the gap 1 between the first battery 20 and the second battery 30 can provide a space for battery expansion, so that the service life of the battery pack is prolonged, and the performance of the battery pack is improved.

It should be noted that, the first battery 20 and the second battery 30 are adjacently mounted to the battery case 10, and the mounting order of the first battery 20 and the second battery 30 is not limited, for example, the first battery 20 and the second battery 30 may be sequentially mounted to the battery case 10, or the first battery 20 and the second battery 30 may be synchronously mounted to the battery case 10, or the second battery 30 and the first battery 20 may be sequentially mounted to the battery case 10.

There is a gap 1 between the first and

second batteries

20 and 30, i.e., no pressing force is formed between the first and

second batteries

20 and 30 during the installation process, so that it is possible to ensure that the first and

second batteries

20 and 30 are separately installed in the battery case 10, thereby providing a buffering space for the first and

second batteries

20 and 30 to expand.

The large surface of the first cell 20 is the largest area surface of the first cell 20, and the large surface of the second cell 30 is the largest area surface of the second cell 30. Taking the first battery 20 as an example, if the first battery 20 is a quadrangular prism battery and the first battery 20 is not provided with any depressions thereon, the first battery 20 may have two opposite large surfaces, for example, the first stacking surface 21 of the first battery 20 and the other surface opposite thereto are the two opposite large surfaces of the first battery 20. As shown in fig. 5 to 7, the first cell 20 is provided with a recess, and at this time, the other surface opposite to the first stacking surface 21 of the first cell 20 is a large surface of the first cell 20, but it is not excluded that the other surface opposite to the first stacking surface 21 of the first cell 20 may be provided with a corresponding recess. The swelling of the large surface of the battery after a long time of use is the most serious, and in the present embodiment, the first battery 20 and the second battery 30 are provided with a buffer space for swelling by having the gap 1 between the first battery 20 and the second battery 30

In one embodiment, mounting the first battery 20 and the second battery 30 adjacent to each other in the battery case 10 includes: the first and

second batteries

20 and 30 are sequentially mounted to the battery case 10 to ensure that the first and

second batteries

20 and 30 can form the gap 1.

In one embodiment, mounting the first battery 20 and the second battery 30 adjacent to each other in the battery case 10 includes: by simultaneously mounting the first battery 20 and the second battery 30 to the battery case 10, not only can the mounting efficiency be improved, but also the mounting positions of the first battery 20 and the second battery 30 can be controlled.

The first battery 20 and the second battery 30 may be installed simultaneously by one installation tool, for example, the first battery 20 and the second battery 30 may be installed simultaneously by a clamping jaw. Alternatively, the first battery 20 and the second battery 30 may be mounted on a fixing structure, and then the fixing structure is mounted on the battery case 10, so that the first battery 20 and the second battery 30 are mounted on the battery case 10 simultaneously.

In one embodiment, the first battery 20 and the second battery 30 are adjacently mounted to the battery case 10, and further include: the first battery 20 is bonded to the battery case 10, and the second battery 30 is bonded to the battery case 10, so that the connection is convenient, and the first battery 20 and the second battery 30 can be reliably fixed to the battery case 10.

In one embodiment, the first battery 20 and the second battery 30 are adjacently mounted to the battery case 10, and further include: the first battery 20 and the second battery 30 are connected to the battery case 10 through the fixing bracket 50, so that the installation is convenient and the installation stability can be ensured.

In one embodiment, the fixing bracket 50 is detachably coupled to the battery case 10 so that the first and

second batteries

20 and 30 are simultaneously removed along with the fixing bracket 50 after the fixing bracket 50 is disconnected from the battery case 10, thereby making it possible to facilitate the replacement of the first and

second batteries

20 and 30.

In one embodiment, the method for assembling a battery pack further comprises: the third battery 60 is mounted on the battery box 10, and the third battery 60 is not fixedly connected with the fixing bracket 50, so that the third battery 60 is prevented from blocking the first battery 20 and the second battery 30 from being detached from the battery box 10 along with the fixing bracket 50, and the first battery 20 and the second battery 30 can be detached independently, thereby facilitating the maintenance of the battery pack.

First battery 20 and second battery 30 are fixed in fixed bolster 50, and fixed bolster 50 detachably sets up in battery box 10 to can guarantee that first battery 20 and second battery 30 set up in battery box 10 steadily, when avoiding the battery package normal use, first battery 20 and second battery 30 appear rocking scheduling problem. When at least one of the first battery 20 and the second battery 30 is maintained, the fixing bracket 50 may be disconnected from the battery case 10, so that the fixing bracket 50 is detached from the battery case 10, the first battery 20 and the second battery 30 may be taken out from the battery case 10, and subsequent maintenance may be performed, for example, at least one of the first battery 20 and the second battery 30 on the fixing bracket 50 may be detached, at least one of the first battery 20 and the second battery 30 that is replaced may be mounted on the original fixing bracket 50, and the fixing bracket 50 may be mounted on the battery case 10 subsequently. Alternatively, the first battery 20, the second battery 30, and the fixing bracket 50 are directly replaced with new ones and mounted to the battery case 10.

In one embodiment, the method for assembling a battery pack further comprises: the third battery 60 is fixed to another fixing bracket 50, and the fixing bracket 50 is detachably disposed in the battery box 10, so that the third battery 60 and the fixing bracket 50 can be simultaneously removed from the battery box 10, thereby facilitating the maintenance of the battery pack. The third cell 60 may be plural, and a gap may be formed between adjacent third cells 60.

In one embodiment, the method for assembling a battery pack further comprises: the first battery 20 and the second battery 30 are connected through the conductive connecting member, so that the first battery 20 and the second battery 30 can be further fixed through the conductive connecting member, and the first battery 20 and the second battery 30 can be reliably fixed in the battery box 10.

The conductive connector may include a circuit board, the circuit board may include a voltage collecting portion, a temperature collecting portion, and the like, and at this time, the circuit board may be connected to the first battery 20 and the second battery 30, for example, one voltage collecting portion of the circuit board may be directly connected to the first battery 20, and the other voltage collecting portion of the circuit board may be directly connected to the second battery 30, and the position of the circuit board is relatively fixed, for example, the circuit board may be fixed to the battery case 10, and at this time, the first battery 20 and the second battery 30 may be fixed to the battery case 10 through the circuit board, so as to ensure that the first battery 20 and the second battery 30 can be reliably fixed in the battery case 10.

In one embodiment, the method for assembling a battery pack further comprises: the first battery 20 and the second battery 30 are connected by the bus bar 40, so that the first battery 20 and the second battery 30 can be fixed by the bus bar 40, and the first battery 20 and the second battery 30 can be ensured to have relatively fixed positions.

The first battery 20 and the second battery 30 are connected by the bus bar 40, and may be before the first battery 20 and the second battery 30 are adjacently mounted to the battery case 10. Alternatively, the first battery 20 and the second battery 30 are connected by the bus bar 40, and may be after the first battery 20 and the second battery 30 are adjacently mounted to the battery case 10.

It should be noted that it is not excluded that the conductive connecting member may be connected to the third battery 60 at the same time, and the conductive connecting member is not limited herein, and may be selected according to actual requirements to perform connection between batteries.

In one embodiment, a method of assembling a battery pack is used to form the battery pack described above.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery pack, comprising:

a battery case (10);

a first battery (20), the first battery (20) being disposed within the battery case (10), the first battery (20) including a first stacking surface (21), the first stacking surface (21) including a first edge region (211) and a first middle region (212), the first edge region (211) being disposed around the first middle region (212);

a second cell (30), the second cell (30) being disposed within the cell housing (10) and being disposed adjacent to the first cell (20), the second cell (30) comprising a second stacking face (31), the second stacking face (31) comprising a second edge region (311) and a second middle region (312), the second edge region (311) being disposed around the second middle region (312);

wherein the first stack face (21) is arranged directly opposite the second stack face (31) such that at least part of the first edge region (211) is arranged directly opposite the second edge region (311), at least part of the first intermediate region (212) is arranged directly opposite the second intermediate region (312), and at least part of the first edge region (211) and the second edge region (311) have a gap (1) between them.

2. The battery pack according to claim 1, wherein the first edge region (211) comprises two first segments (2111) and two second segments (2112) which are opposite to each other, two ends of the first segments (2111) are respectively connected with the two second segments (2112), the first segments (2111) extend along the length direction of the first battery (20), and at least part of the second segments (2112) extend along the width direction of the first battery (20);

wherein the gap (1) is present between at least part of the first segment (2111) and the second edge region (311).

3. A battery pack according to claim 2, wherein the gap (1) is present between at least part of the second section (2112) and the second edge region (311).

4. The battery pack of claim 2, wherein the first section (2111) is substantially planar, and/or the second section (2112) is substantially planar.

5. A battery pack according to claim 1, wherein the gap (1) has a size in the range of 0.2mm-1 mm.

6. A battery pack according to claim 5, wherein the gap (1) has a size in the range of 0.4-0.6 mm.

7. A battery pack, according to claim 1, characterized in that at least part of said first intermediate region (212) is in direct contact with said second intermediate region (312);

alternatively, neither the first intermediate region (212) nor the second intermediate region (312) is in contact.

8. A battery pack according to any of claims 1 to 7, wherein the area of the first edge region (211) and the area of the second edge region (311) are substantially equal, and the area of the first intermediate region (212) and the area of the second intermediate region (312) are substantially equal.

9. The battery pack according to any one of claims 1 to 7, wherein the first battery (20) comprises a first pole assembly (22), the first pole assembly (22) being disposed at the first stacking surface (21), the second battery (30) comprising a first recess (32), the first recess (32) being disposed toward the first stacking surface (21), a portion of the first pole assembly (22) being located within the first recess (32);

wherein the first recess (32) is located outside the range of the second stacking surface (31), and the area of the first stacking surface (21) is larger than that of the second stacking surface (31).

10. The battery pack according to any one of claims 1 to 7, characterized in that the first battery (20) comprises a first pole assembly (22) and a second recess (23), the first pole assembly (22) being arranged in the second recess (23), the second recess (23) being arranged towards the second battery (30), the second recess (23) being located outside the range of the first stacking surface (21).

11. Battery pack according to any of claims 1 to 7, further comprising an electrically conductive connection to the first battery (20) and to the second battery (30) for fixing the first battery (20) and the second battery (30).

12. Battery pack according to claim 11, wherein the electrically conductive connection comprises a busbar (40), the busbar (40) being connected with the first battery (20), the busbar (40) being connected with the second battery (30).

13. The battery pack according to any one of claims 1 to 7, wherein the first battery (20) is bonded to the battery case (10), and the second battery (30) is bonded to the battery case (10).

14. Battery pack according to one of claims 1 to 7, characterized in that the battery housing (10) is provided with a fixing bracket (50), the fixing bracket (50) being connected with the first battery (20) and the fixing bracket (50) being connected with the second battery (30).

15. The battery pack according to claim 14, further comprising a third battery (60), wherein the third battery (60) is disposed in the battery box (10), the fixing bracket (50) is detachably disposed with the battery box (10), and the fixing bracket (50) is not fixedly connected with the third battery (60) so as to prevent the third battery (60) from blocking the first battery (20) and the second battery (30) from being removed from the battery box (10) simultaneously with the fixing bracket (50).

16. The battery pack according to claim 1, wherein the first battery (20) and the second battery (30) are each a quadrangular prism battery; and/or, the first cell (20) further comprises a surrounding surface (24), the surrounding surface (24) being arranged adjacent to the first stacking surface (21), there being a transition surface (25) between the surrounding surface (24) and the first stacking surface (21), the transition surface (25) being a curved surface.