CN219937167U - Single battery and battery pack - Google Patents

Abstract

The utility model provides a single battery and a battery pack, and belongs to the technical field of batteries. The single battery comprises a shell, a heat dissipation channel, a heat dissipation module and a heat dissipation module, wherein the shell is provided with an outer shell and an inner shell, the inner shell and the outer shell define a containing space, and the containing space surrounds the heat dissipation channel and is isolated from the heat dissipation channel; the top cover is connected with the shell, and the cover seal accommodating space and the shell form a seal cavity; the battery cell is arranged in the sealed cavity; the first pole and the second pole are respectively penetrated through the top cover and are electrically connected with the battery cell; the heat dissipation channel comprises a first opening and a second opening which are communicated, and the first opening is positioned between the first pole and the second pole. Through encircle sealed chamber in heat dissipation channel and with sealed chamber isolation to make the heat that the electricity core produced at the during operation can be discharged through heat dissipation channel, in order to promote radiating efficiency, moreover can be further with the heat extraction that the electricity core produced through the cooling tube, thereby further promote radiating efficiency and security performance.

Description

Single battery and battery pack

Technical Field

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

Background

The current power battery cell can only adopt a single outer surface of the battery cell as a heat exchange surface, the heat conduction path of the central area of the battery cell is overlong, and the temperature of the battery cell can not be effectively reduced in time, so that the service life, the safety performance and the cycle performance of the battery are affected.

Disclosure of Invention

In view of the above, the present utility model aims to overcome the defects in the prior art, and provide a single battery and a battery pack.

The utility model provides the following technical scheme: a battery cell, comprising:

the shell is provided with an outer shell and an inner shell, the inner shell defines a heat dissipation channel, the inner shell and the outer shell define an accommodating space, and the accommodating space surrounds the heat dissipation channel and is isolated from the heat dissipation channel;

the top cover is connected with the shell, and covers the accommodating space and the shell to form a sealing cavity;

the battery cell is arranged in the sealing cavity;

the first pole and the second pole are respectively penetrated through the top cover and are electrically connected with the electric core;

the heat dissipation channel comprises a first opening and a second opening which are communicated, and the first opening is positioned between the first pole and the second pole.

In some embodiments of the utility model, the first opening coincides with the second opening along the axial direction of the housing.

Further, the length of the inner case is equal to the length of the outer case in the axial direction of the case.

Further, along the first direction, the distance between two opposite sides of the inner shell is L1 cm, the distance between two opposite sides of the outer shell is L2 cm, and 0.3 xL2.ltoreq.L1.ltoreq.0.7xL2 is satisfied;

along the second direction, the distance between two opposite sides of the inner shell is L3 cm, the distance between two opposite sides of the outer shell is L4 cm, and the condition that L3 is more than or equal to 0.6XL4 and less than or equal to 0.9XL4 is satisfied;

the first direction, the second direction and the axial direction of the shell are perpendicular to each other.

Further, the single battery further comprises a connecting sheet, wherein the connecting sheet is provided with a first end and a second end;

the first end is electrically connected with the first pole, the second end is correspondingly arranged on one side of the shell, which is away from the first pole, and the second end is used for being electrically connected with the second pole of the adjacent single battery.

Further, the connecting sheet comprises a first insulating layer, a conductive layer and a second insulating layer which are sequentially laminated;

the first insulating layer is provided with a first window, a first conducting part is formed at the part of the conducting layer exposed out of the first window, and the first conducting part is electrically connected with the first pole;

the second insulating layer is provided with a second window, and a second conductive part is formed at the part of the conductive layer exposed out of the second window and is used for being electrically connected with a second pole of an adjacent single battery.

Further, the first insulating layer is disposed towards the housing, the first conductive portion is located at the first end, and the second conductive portion is located at the second end.

Further, the first window and the second window are respectively located at two opposite sides of the shell along the first direction, and the first window and the second window are coaxially arranged along the first direction.

Further, a cross-sectional area of the first pole along a second direction is smaller than or equal to an area of the first window, and an area of the second window is larger than or equal to an area of the first window, and the second direction is perpendicular to the first direction.

Further, an insulating glue is arranged in the circumferential direction of the first pole, so that a wrapping part wrapping the outer part of the first pole is defined by the insulating glue and the first end.

Further, the heat dissipation channels are multiple, and the multiple heat dissipation channels are arranged at intervals.

Some embodiments of the utility model also provide a battery pack comprising the single battery.

Further, the number of the single batteries is multiple;

the battery pack further includes:

the cooling pipe penetrates through the heat dissipation channel of the single battery so as to fix the single batteries in series.

Embodiments of the present utility model have the following advantages: the top cover is covered at the opening end of the shell to limit the containing space inside the shell to form a sealing cavity, the battery cell is arranged in the sealing cavity to form a protection effect on the battery cell, meanwhile, the shell is provided with a heat dissipation channel, and the sealing cavity surrounds the heat dissipation channel and is isolated from the sealing cavity, so that heat generated by the battery cell during working can be discharged through the heat dissipation channel, and the heat dissipation efficiency is improved; through wearing to locate the cooling tube in the heat dissipation channel of battery cell, not only can be with a plurality of battery cells series connection fixed, reach the purpose that subtracts heavy and falls the cost, moreover can be further with the heat export that the electric core produced through the cooling tube to further promote radiating efficiency and security performance.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram illustrating a view angle of a single battery according to some embodiments of the present utility model;

fig. 2 is a schematic structural view illustrating another view of a single battery according to some embodiments of the present utility model;

fig. 3 is a schematic structural view of a cross section of a single cell according to some embodiments of the present utility model;

FIG. 4 shows an enlarged view of portion A of FIG. 3;

FIG. 5 shows an enlarged view of section B of FIG. 3;

fig. 6 is a schematic structural view of a connection piece in a single battery according to some embodiments of the present utility model;

fig. 7 is a schematic structural view of a cross section of a connecting piece in a single battery according to some embodiments of the present utility model;

fig. 8 is a schematic view showing a structure of a cross section of a battery pack according to some embodiments of the present utility model;

fig. 9 is a schematic view illustrating a structure of a battery pack according to some embodiments of the present utility model;

fig. 10 is a schematic structural view illustrating another view of a single battery according to some embodiments of the present utility model.

Description of main reference numerals:

100-single battery; 110-a housing; 120-heat dissipation channels; 130-top cap; 140-cell; 150-a first pole; 160-second pole; 121-a first opening; 122-a second opening; 200-connecting sheets; 210-a first end; 220-a second end; 230-a first insulating layer; 240-a conductive layer; 250-a second insulating layer; 231-a first window; 251-a second window; 241-first conductive portions; 242-second conductive portions; 300-insulating glue; 400-cooling pipes; 500-battery pack.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 3, some embodiments of the present utility model provide a single battery, which is mainly applied to a power device. The unit battery 100 includes a case 110, the case 110 has an outer case and an inner case, the outer case is sleeved on the inner case, and the outer case and the inner case are spaced apart from each other, the inner case is connected to the same side of the outer case through an annular bottom cover, and specifically, edges of the annular bottom cover connect edges of the same sides of the outer case and the inner case.

The inner case and the outer case are each any one of a hollow annular structure, a tubular structure, a polygonal column structure, and an elliptical structure.

In this embodiment, the inner shell and the outer shell are both square structures with a hollow square shape.

Specifically, the inner wall of the inner case defines a heat dissipation channel 120, and the inner case and the outer case define an accommodation space. Since the outer shell is sleeved on the inner shell, the heat dissipation channel 120 and the accommodating space are separated by the inner shell, that is, the accommodating space surrounds the heat dissipation channel 120, and the accommodating space is isolated from the heat dissipation channel 120.

The shape of the housing 110 may be any of a cylinder, a square, and a polygonal column. In this embodiment, the housing 110 has a square structure.

The unit battery 100 includes a top cover 130, where the top cover 130 is connected to the housing 110, the top cover 130 covers the open end of the housing 110, and the accommodating space and the housing 110 are sealed by the top cover 130 to form a sealed cavity. It should be noted that, the top cover 130 has an opening, and the opening communicates with the heat dissipation channel 120, so as to avoid the top cover 130 from blocking the heat dissipation channel 120.

The connection between the top cover 130 and the housing 110 at least includes any one of bonding, clamping or bolting.

The single battery 100 includes a battery cell 140, where the battery cell 140 is disposed in the sealed cavity, and the battery cell 140 contacts with an inner wall of the housing 110, so as to form a limiting and fixing function on the battery cell 140 through the housing 110 and the top cover 130, so as to improve stability of the battery cell 140 in the housing 110.

It is understood that in the present embodiment, the battery cell 140 has a hollow ring structure.

The single battery 100 includes a first pole 150 and a second pole 160, where the first pole 150 and the second pole 160 are respectively disposed through the top cover 130 and electrically connected to the battery cell 140, so that the battery cell 140 can be electrically connected to an external carrier through the first pole 150 and the second pole 160.

Note that, when the first pole 150 is a positive pole, the second pole 160 is a negative pole; or when the first pole 150 is a negative pole, the second pole 160 is a positive pole. It will be appreciated that the first and second posts 150 and 160 are used to connect with the positive and negative poles of an external carrier, respectively, thereby electrically connecting the cells 140 in the battery cell 100 with the external carrier.

The heat dissipation channel 120 includes a first opening 121 and a second opening 122 that are in communication, specifically, the first opening 121 and the second opening 122 are respectively located on two opposite sides of the housing 110, and the first opening 121 is located between the first pole 150 and the second pole 160.

It will be appreciated that in this embodiment, the first pole 150 and the second pole 160 are disposed on the same side of the battery cell 140, respectively, and the first pole 150 and the second pole 160 are separated by the first opening 121.

Preferably, in this embodiment, along the axial direction of the housing 110, the first opening 121 coincides with the second opening 122, so that when external gas or cooling liquid enters the heat dissipation channel 120 from the first opening 121 and is discharged through the second opening 122, the smoothness and uniformity of the gas or liquid flowing in the heat dissipation channel 120 are improved, thereby improving the uniformity of heat dissipation of the single battery, avoiding the uneven heat dissipation, and further improving the service life of the single battery.

In addition, in some embodiments, the length of the inner case is equal to the length of the outer case along the axial direction of the housing 110, so that the length of the heat dissipation channel 120 can be maximized, thereby increasing the heat dissipation path of the unit cell and improving the heat dissipation efficiency of the unit cell.

In some embodiments of the utility model, as shown in FIG. 10, the distance between the two opposite sides of the inner shell is L1 cm and the distance between the two opposite sides of the outer shell is L2 cm in the first direction, satisfying 0.3 XL2.ltoreq.L1.ltoreq.0.7XL2. It is understood that the relationship between L1 and L2 may be any of 0.3 XL 2.ltoreq.L1.ltoreq.0.7XL2, 0.4 XL 2.ltoreq.L1.ltoreq.0.7XL2, 0.5 XL2.ltoreq.L1.ltoreq.0.7XL2, 0.6XL2.ltoreq.L1.ltoreq.0.7XL2. For example, when L2 is 1, the value range of L1 is 0.3.ltoreq.L1.ltoreq.0.7; when the value of L2 is 10, the value range of L1 is 3-7.

Specifically, the first direction is a width direction of the first opening.

In the second direction, the distance between the two opposite sides of the inner shell is L3 cm, and the distance between the two opposite sides of the outer shell is L4 cm, so that the L3 is more than or equal to 0.6XL4 and less than or equal to 0.9XL4. It is understood that the relationship between L3 and L4 may be any one of 0.6XL4.ltoreq.L3.ltoreq.0.9XL4, 0.7XL4.ltoreq.L3.ltoreq.0.9XL4, 0.8XL4.ltoreq.L3.ltoreq.0.9XL4. For example, when L4 is 1, the value of L3 is 0.6.ltoreq.L1.ltoreq.0.9; when the value of L4 is 10, the value range of L3 is 6-9.

The second direction is a longitudinal direction of the first opening.

Illustratively, 0.6XL2.ltoreq.L1.ltoreq.0.7XL2, and 0.8XL4.ltoreq.L3.ltoreq.0.9XL4, so that the surface area of the inner case can be maximized, that is, the sectional area of the heat dissipation path defined by the inner case can be maximized, that is, the areas of the first opening and the second opening can be maximized. At this time, the contact area between the inner shell and the battery cell increases, and when gas or liquid flows through the heat dissipation channel, the heat generated by the battery cell can be transferred away to the greatest extent, so that the heat dissipation efficiency of the single battery is improved.

By way of example, when 0.3xL2.ltoreq.L1.ltoreq.0.4xL2, by increasing the value of L3, the areas of the first opening and the second opening can be increased, thereby improving the heat dissipation efficiency of the unit cell.

In addition, when L3 is more than or equal to 0.6XL4 and less than or equal to 0.7XL4, the areas of the first opening and the second opening can be increased by increasing the value of L1, so that the heat dissipation efficiency of the single battery is improved.

Thus, as can be seen from the above examples, when the distance L1 between the opposite sides of the inner case in the first direction and/or the distance L3 between the opposite sides of the inner case in the second direction increases, it can be understood that the cross-sectional area of the inner case, that is, the areas of the first opening and the second opening, is increased by increasing the lengths of L1 and L3, so that the cross-sectional area of the heat dissipation channel 120 increases, thereby increasing the volume of the heat dissipation channel 120. Since the length of the heat dissipation channel 120 is a certain value, when the volume of the heat dissipation channel 120 increases, that is, the surface area of the inner wall of the inner case increases, that is, the contact area between the inner wall of the inner case and the air or the cooling liquid outside increases, the heat dissipation efficiency of the unit cell can be further improved.

The first direction, the second direction, and the axial direction of the housing 110 are perpendicular to each other.

In this embodiment, the axis of the outer shell, the axis of the inner shell, and the axis of the housing 110 are parallel to each other.

It should be noted that, when the first pole 150 and the second pole 160 are electrically connected with the external carrier, the electric core 140 generates heat during the working process, the heat generated by the electric core 140 can dissipate heat through the surface of the housing 110 under the action of the external air flow, and meanwhile, the external air flow can dissipate heat through the heat dissipation channel 120 disposed in the middle of the housing 110 and take away a part of the heat generated by the electric core 140, so as to form a comprehensive heat dissipation to the surface of the electric core 140, and further improve the heat dissipation efficiency of the electric core 140 and the single battery 100, thereby increasing the safety and the cycle performance of the electric core 140 and the single battery 100.

As shown in fig. 1, 3, 4 and 6, in some embodiments of the present utility model, the unit battery 100 further includes a connection tab 200, the connection tab 200 having a first end 210 and a second end 220, wherein the first end 210 and the second end 220 are located at both ends of the connection tab 200, respectively.

In this embodiment, the connection piece 200 has a strip structure with conductive performance.

The first end 210 of the connection piece 200 is electrically connected to the first pole 150, the second end 220 of the connection piece 200 is correspondingly disposed on a side of the housing 110 away from the first pole 150, and the second end 220 is electrically connected to the second pole 160 of the adjacent unit battery 100, so that two or more unit batteries 100 can be sequentially connected to connect multiple unit batteries 100 in series.

In this embodiment, the connection piece 200 is a C-shaped connection piece 200, so that the first end 210 and the second end 220 of the connection piece 200 are disposed at opposite sides of the unit cell 100, respectively. Specifically, the first end 210 of the connecting piece 200 is close to the first opening 121, and the second end 220 of the connecting piece 200 is close to the second opening 122.

Specifically, the connection piece 200 is disposed on an outer side wall of the housing 110, and the connection manner between the connection piece 200 and the housing 110 may be any one of bonding, clamping or bolting, so as to improve stability of the connection piece 200 on the housing 110.

As shown in fig. 2, 4, 5, 6 and 7, in some embodiments of the present utility model, the connection pad 200 includes a first insulating layer 230, a conductive layer 240 and a second insulating layer 250 sequentially stacked, wherein the first insulating layer 230 and the second insulating layer 250 are completely wrapped around the conductive layer 240, respectively, so as to form an insulating protection layer on the outer surface of the connection pad 200.

The first insulating layer 230 is provided with a first window 231, and specifically, the first window 231 is located at the first end 210 of the connecting piece 200, so that a portion of the conductive layer 240 located at the first end 210 exposed to the first window 231 forms a first conductive portion 241, and the first conductive portion 241 is electrically connected to the first pole 150. Specifically, the first electrode post 150 is electrically connected to the first conductive layer 240 through the first window 231.

Meanwhile, a second window 251 is disposed in the second insulating layer 250, and the second window 251 is located at the second end 220 of the connecting piece 200, so that a portion of the conductive layer 240 exposed to the second window 251 forms a second conductive portion 242, where the second conductive portion 242 is used for electrically connecting with the second post 160 of the adjacent unit cell 100.

It should be noted that the first insulating layer 230 is disposed towards the housing 110, so that the conductive layer 240 in the connection piece 200 and the housing 110 of the unit battery 100 form an insulating barrier by the first insulating layer 230.

It will be appreciated that the second conductive portion 242 is electrically connected to the first pole 150 via the first conductive portion 241, that is, the single cell 100 is transferred from the first end 210 to the second end 220 of the connection sheet 200 via the connection sheet 200 at the first pole 150, that is, the external carrier is electrically connected to the second conductive portion 242 of the second end 220 to make electrical connection to the first pole 150, whereby a plurality of single cells 100 can be connected in series.

As shown in fig. 6 and 7, in some embodiments of the present utility model, the first window 231 and the second window 251 are respectively located at two opposite sides of the housing 110 along a first direction, wherein the first direction is an axial direction of the heat dissipation channel 120.

Meanwhile, the first window 231 and the second window 251 are coaxially disposed along the first direction. Therefore, when the two unit batteries 100 are connected with each other, the heat dissipation channels 120 arranged in the two unit batteries 100 can be coaxially communicated, so that shielding of one unit battery 100 to the heat dissipation channel 120 of the other unit battery 100 is avoided, and heat dissipation efficiency of the two unit batteries 100 during connection is improved.

In addition, in some embodiments, the first window 231 and the second window 251 are disposed opposite to each other, and in the first direction, the first window 231 and the second window 251 completely coincide.

As shown in fig. 6 and 7, in some embodiments of the present utility model, the cross-sectional area of the first pole 150 along the second direction is smaller than or equal to the area of the first window 231, and the first window 231 completely covers the first pole 150 along the first direction, so that the first pole 150 can form an electrical connection with the first conductive portion 241 through the first window 231.

In addition, the area of the second window 251 is greater than or equal to the area of the first window 231, so as to avoid that the second post 160 of one unit cell 100 cannot pass through the second window 251 of another unit cell 100 to form an electrical connection with the second conductive portion 242.

Preferably, the area of the second window 251 is greater than or equal to the cross-sectional area of the second post 160 in the second direction, so that when two unit batteries 100 are connected in series, the second post 160 of one unit battery 100 can pass through the second window 251 of the other unit battery 100 to form an electrical connection with the second conductive part 242, so as to form an electrical connection between the first post 150 of one unit battery 100 and the second post 160 of the other unit battery 100, thereby connecting the two unit batteries 100 in series.

The second direction is perpendicular to the first direction.

As shown in fig. 4, in some embodiments of the present utility model, an insulating glue 300 is disposed around the first pole 150, so that a wrapping portion that wraps the first pole 150 is defined by the insulating glue 300 and the first end 210 together, so as to protect the first pole 150.

It should be noted that, the first end 210 of the connecting piece 200 and the single battery 100 can be bonded through the insulating adhesive 300, and the bonding can be formed in the circumferential direction of the first pole 150 through insulation, so as to improve the stability of the connection between the first end 210 and the first pole 150, and meanwhile, the first pole 150 is wrapped through the insulating adhesive 300 and the first end 210, so as to avoid the first pole 150 from being electrically connected with other conductive parts, so as to improve the stability and safety of the single battery 100 in the use process.

In addition, in some embodiments of the present utility model, the heat dissipation channels 120 are plural, and the plural heat dissipation channels 120 are spaced apart.

It should be noted that the axes of the plurality of heat dissipation channels 120 are parallel to each other and all are parallel to the first direction. By providing a plurality of heat dissipation channels 120, the surface area of the unit battery 100 can be increased, thereby increasing the heat dissipation area of the unit battery 100 and improving the heat dissipation efficiency.

Optionally, the shape of the heat dissipation channel 120 is any one of a linear type, a folded linear type, or a curved type.

Preferably, in this embodiment, the heat dissipation channel 120 is a linear channel.

As shown in fig. 8, some embodiments of the present utility model provide a battery pack 500, the battery pack 500 including the unit cells 100 described in any one of the above embodiments.

The battery pack 500 has a case in which the unit batteries 100 are accommodated.

As shown in fig. 9, in some embodiments of the present utility model, the number of the single batteries 100 may be two or more than two arbitrary values, and may be specifically set according to practical situations, and in this embodiment, the number of the single batteries 100 is not specifically limited.

Specifically, the battery pack 500 further includes a cooling tube 400, where the cooling tube 400 is sequentially inserted through the heat dissipation channels 120 of each of the unit batteries 100, so as to fix the plurality of unit batteries 100 in series.

It should be noted that, in order to improve the stability of the connection between the unit battery 100 and the cooling tube 400, the outer wall of the cooling tube 400 contacts with the inner wall of the heat dissipation channel 120, so as to limit the unit battery 100 through the cooling tube 400. In addition, the cooling tube 400 is directly contacted with the inner wall of the heat dissipation channel 120, so that heat generated during the operation of the single battery 100 is directly transferred to the cooling tube 400 through the four contact surfaces of the heat dissipation channel 120, and the heat dissipation path of the single battery 100 is shortened, so that the heat conduction efficiency between the single battery 100 and the cooling tube 400 is improved, and the single battery 100 is enabled to realize high-efficiency and rapid heat dissipation.

Optionally, in some embodiments, the cooling tube 400 is filled with a flowable cooling liquid or cooling air flow, and the cooling liquid or cooling air flow is filled in the cooling tube 400 to absorb heat generated by the operation of the unit battery 100 through the cooling liquid or cooling air flow flowing in the cooling tube 400, thereby further improving the heat dissipation efficiency of the unit battery 100.

In addition, when the plurality of unit batteries 100 are sequentially connected in series, in any two adjacent unit batteries 100, the second conductive post of one unit battery 100 is inserted into the second window 251 of the other unit battery 100 and is electrically connected with the second conductive portion 242, and the heat dissipation channels 120 of each unit battery 100 are coaxially disposed, so that the cooling tube 400 can sequentially pass through the heat dissipation channels 120 of each unit battery 100, and the degree of freedom of the unit battery 100 along the first direction is limited by the cooling tube 400, so as to fix the plurality of unit batteries 100, thereby reducing the rigidity requirements of the upper cover and the lower cover of the battery pack 500, and achieving the purpose of weight reduction and cost reduction.

It should be noted that, when any two adjacent unit batteries 100 are connected in series, when the second window 251 of one unit battery 100 penetrating the second electrode 160 of the other unit battery 100 is electrically connected with the second conductive portion 242, the insulating glue 300 is disposed in the circumferential direction of the second electrode 160 connected with the second conductive portion 242, so that a wrapping portion wrapping the outer portion of the second electrode 160 of the other unit battery 100 is defined by the insulating glue 300 and the second end 220 of one unit battery 100 together, so as to improve stability and safety in the electrical connection process of the two adjacent unit batteries 100.

Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (13)

1. The battery cell, its characterized in that includes:

the shell is provided with an outer shell and an inner shell, the inner shell defines a heat dissipation channel, the inner shell and the outer shell define an accommodating space, and the accommodating space surrounds the heat dissipation channel and is isolated from the heat dissipation channel;

the top cover is connected with the shell, and covers the accommodating space and the shell to form a sealing cavity;

the battery cell is arranged in the sealing cavity;

the first pole and the second pole are respectively penetrated through the top cover and are electrically connected with the electric core;

the heat dissipation channel comprises a first opening and a second opening which are communicated, and the first opening is positioned between the first pole and the second pole.

2. The unit cell according to claim 1, wherein the first opening coincides with the second opening in the axial direction of the case.

3. The unit cell according to claim 1, wherein the length of the inner case is equal to the length of the outer case in the axial direction of the case.

4. The cell of claim 1, wherein the distance between the opposite sides of the inner case is L1 cm and the distance between the opposite sides of the outer case is L2 cm in the first direction, such that 0.3 xl2+.l1+.0.7xl2;

along the second direction, the distance between two opposite sides of the inner shell is L3 cm, the distance between two opposite sides of the outer shell is L4 cm, and the condition that L3 is more than or equal to 0.6XL4 and less than or equal to 0.9XL4 is satisfied;

the first direction, the second direction and the axial direction of the shell are perpendicular to each other.

5. The cell of claim 1, further comprising a connecting tab having a first end and a second end;

the first end is electrically connected with the first pole, the second end is correspondingly arranged on one side of the shell, which is away from the first pole, and the second end is used for being electrically connected with the second pole of the adjacent single battery.

6. The unit cell according to claim 5, wherein the connecting sheet comprises a first insulating layer, a conductive layer, and a second insulating layer laminated in this order;

the first insulating layer is provided with a first window, a first conducting part is formed at the part of the conducting layer exposed out of the first window, and the first conducting part is electrically connected with the first pole;

the second insulating layer is provided with a second window, and a second conductive part is formed at the part of the conductive layer exposed out of the second window and is used for being electrically connected with a second pole of an adjacent single battery.

7. The cell of claim 6, wherein the first insulating layer is disposed toward the housing, the first conductive portion is at the first end, and the second conductive portion is at the second end.

8. The battery cell of claim 6, wherein the first window and the second window are located on opposite sides of the housing in a first direction, respectively, and the first window and the second window are coaxially disposed in the first direction.

9. The cell of claim 8, wherein a cross-sectional area of the first post in a second direction is less than or equal to an area of the first window, and an area of the second window is greater than or equal to an area of the first window, the second direction being perpendicular to the first direction.

10. The unit cell according to any one of claims 5 to 9, wherein an insulating paste is provided in a circumferential direction of the first electrode post so as to define a wrapping portion wrapping an outside of the first electrode post together with the insulating paste and the first end.

11. The unit cell according to any one of claims 1 to 9, wherein the heat dissipation channels are plural, and the plural heat dissipation channels are arranged at intervals.

12. A battery pack, comprising: the unit cell of any one of claims 1 to 11.

13. The battery pack of claim 12, wherein the single cells are a plurality of;

the battery pack further includes:

the cooling pipe penetrates through the heat dissipation channel of the single battery so as to fix the single batteries in series.