CN117638423A

CN117638423A - Battery pack and vehicle

Info

Publication number: CN117638423A
Application number: CN202211001344.5A
Authority: CN
Inventors: 郑卫鑫; 吴艳凤; 陈龙; 尤悦丘; 张顺
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2024-03-01

Abstract

The application discloses battery package and vehicle, battery package include battery cell, and battery cell includes: the shell is internally limited with an accommodating space, the shell is provided with edges extending along a first direction, a second direction and a third direction, the first direction and the second direction define a first plane, the first direction and the third direction define a second plane, the second direction and the third direction define a third plane, the shell is at least provided with a first surface, a second surface and a third surface, the first surface is connected with the second surface, the first surface is parallel to the third plane, the second surface is parallel to the second plane, the third surface is parallel to the first plane, and the surface area of the second surface is larger than that of the first surface; the battery cell is arranged in the accommodating space; the electrode posts are arranged on the battery core and extend out of the shell from the second surface, and at least one electrode post is a sheet body. The battery package of this application is favorable to quick charge through set up slice utmost point post at the second surface.

Description

Battery pack and vehicle

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery pack and a vehicle with the battery pack.

Background

The pole core in the prior art usually adopts a winding or lamination structure, the cover plate is positioned on the wide edge of the side surface, and the positions of the pole column, the explosion-proof valve, the liquid injection hole and the like are required to be reserved on the side surface cover plate, so that the design of leading out the side surface pole column is realized. However, the existing design is limited by the small size of the side cover plate, and the small overcurrent area of the tab and the pole, which results in high heating degree and further limited quick charge.

Disclosure of Invention

An object of the present application is to provide a battery pack capable of solving the problem of limited battery fast charge capability in the background art.

According to a first aspect of the present application, there is provided a battery pack including a unit cell including: a housing defining a receiving space therein, the housing having a rim extending in a first direction, a second direction and a third direction, the first direction and the second direction defining a first plane, the first direction and the third direction defining a second plane, the second direction and the third direction defining a third plane, the housing having at least a first surface, a second surface and a third surface, the first surface being connected to the second surface and the first surface being parallel to the third plane, the second surface being parallel to the second plane, the third surface being parallel to the first plane, the second surface having a surface area greater than a surface area of the first surface; the battery cell is arranged in the accommodating space; the electrode posts are arranged on the battery core and extend out of the shell from the second surface, and at least one electrode post is a sheet body.

According to an embodiment of the present application, the battery pack further includes: and the cooler is arranged on one side of the pole away from the second surface and is respectively in heat conduction with the pole and the second surface.

According to an embodiment of the present application, the number of the coolers is two, and the unit cell is located between the two coolers.

According to an embodiment of the present application, the battery pack further includes: and a heat transfer member, at least a portion of which is located between the cooler and the pole and which enables heat transfer from the pole and the second surface to the cooler.

According to an embodiment of the present application, the heat transfer member includes: and the heat conduction piece is arranged on the second surface and is in heat transfer with the pole and the cooler respectively.

According to an embodiment of the present application, in the third direction, the number of the poles is plural, and two adjacent poles are respectively connected to one of the heat conductive members.

According to the embodiment of the application, the heat transfer piece still includes first connecting portion, second connecting portion and the third connecting portion that connect gradually, first connecting portion the second connecting portion with the cooperation of third connecting portion is formed with the holding tank, the holding tank is used for acceping the heat-conducting piece, first connecting portion with two one of the utmost point post is connected, second connecting portion with two another of the utmost point post is connected, third connecting portion is located first connecting portion with between the second connecting portion, third connecting portion respectively with first connecting portion with the second connecting portion is connected.

According to an embodiment of the application, a second fluid channel is provided in the cooler for cooling fluid flow, and the cooler is in heat conducting connection with the heat transfer element.

According to an embodiment of the present application, the pole is parallel to the first plane.

According to an embodiment of the present application, the housing comprises: a side plate having the first surface and the third surface; the cover plate is arranged on the side plate and surrounds the side plate to form the accommodating space, a through mounting hole is formed in the cover plate, and the pole penetrates through the mounting hole; the side plate includes: a first side portion extending in the second direction; and a second side portion extending along the first direction, a first end of the second side portion being connected to an end of the first side portion in the second direction, a second end of the second side portion extending in a direction away from the first side portion, the second side portion being connected to the cover plate.

According to an embodiment of the present application, the side plate further includes: and the first end of the third side part is connected with the second end of the second side part, the second end of the third side part extends towards the direction where the first side part is located, and the third side part and the second side part are stacked in the first direction.

According to the embodiment of the application, the cover plate is provided with the step portion on one side close to the accommodating space, the cover plate comprises a first side face and a second side face which are distributed at intervals in the first direction, the first side face is in butt joint with the edge of the cover plate, the thickness of the position, corresponding to the first side face, on the cover plate is smaller than the thickness of the position, corresponding to the second side face, on the cover plate, the end face of the side plate in the first direction is connected with the first side face.

According to a second aspect of the present application, there is provided a vehicle comprising the battery pack of any one of the embodiments described above.

According to one embodiment of the present disclosure, on one hand, a polar column with at least a part of a sheet structure is adopted, the area of the outer surface of the polar column is large, the overcurrent area of the polar column and the current collector is large, and a battery adopting the polar column of the present disclosure has a better fast charge capability; in still another aspect, the number and/or the area of the polar posts can be increased by arranging the polar posts on the second surface, so that the heat dissipation effect and the quick charging capability of the polar posts are further improved. Therefore, the pole of this application sets up at the second surface, is favorable to realizing that the top draws forth, and the size of second surface is great, is favorable to improving the total area of pole to can improve the overflow area of utmost point ear and pole, reduce the degree of generating heat, be favorable to quick charge.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a partial exploded view of a single battery according to a first embodiment provided in the present application;

FIG. 2 is a schematic illustration of the connection of a current collector and a pole of one embodiment provided herein;

fig. 3 is a schematic view of an internal current of a single battery according to a first embodiment provided in the present application;

fig. 4 is a partial exploded view of a battery cell according to a second embodiment provided in the present application;

fig. 5 is an angular assembly schematic of a current collector and a cell body according to a second embodiment of the present disclosure;

fig. 6 is a schematic view of the internal current of a battery cell according to a second embodiment provided in the present application;

fig. 7 is a partial exploded view of a battery cell according to a third embodiment provided in the present application;

fig. 8 is a schematic view of an assembled view of a current collector and a cell body at an angle according to embodiment three provided herein;

fig. 9 is a partial exploded view of a battery cell according to a fourth embodiment provided herein;

Fig. 10 is a schematic view of an assembled view of a current collector and a cell body at an angle according to a fourth embodiment provided herein;

fig. 11 is a schematic view of the internal current of a single cell according to a fourth embodiment provided in the present application;

fig. 12 is a partial exploded view of a battery cell of embodiment five provided herein;

fig. 13 is a schematic view of an angled assembly of a current collector and a cell body of embodiment five provided herein;

fig. 14 is a schematic view of the internal current of a battery cell according to embodiment five provided in the present application;

fig. 15 is a partial exploded view of a battery cell according to a sixth embodiment provided in the present application;

fig. 16 is a schematic view showing the assembly of a current collector and a cell body at an angle according to a sixth embodiment provided in the present application;

fig. 17 is a schematic view of the internal current of a battery cell according to a sixth embodiment provided in the present application;

fig. 18 is a partial exploded view of a battery cell according to embodiment seven provided herein;

fig. 19 is a schematic view of an assembled view of a current collector and a cell body at an angle according to embodiment seven provided herein;

fig. 20 is a schematic view of an assembled view of a current collector and a cell body at yet another angle according to embodiment seven provided herein;

fig. 21 is a schematic view of the internal current of a single cell according to embodiment seven provided in the present application;

Fig. 22 is a partial exploded view of a unit cell of embodiment eight provided herein;

fig. 23 is a schematic view showing the assembly of a current collector and a cell body according to an embodiment eight of the present application;

fig. 24 is a schematic view of the internal current of a single cell of embodiment eight provided herein;

FIG. 25 is a schematic view of an assembly of a cover plate and side plates of one embodiment provided herein;

FIG. 26 is a schematic view of the assembly of a cover plate and side plate of yet another embodiment provided herein;

FIG. 27 is a schematic view of an assembly of a cover plate and side plates of yet another embodiment provided herein;

FIG. 28 is a schematic diagram of an assembly of a heat dissipating assembly and a battery cell according to one embodiment provided herein;

FIG. 29 is a schematic view of an assembly of a heat dissipating assembly and a battery cell according to yet another embodiment provided herein;

FIG. 30 is a schematic view of an assembly of a heat dissipating assembly and a battery cell according to yet another embodiment provided herein;

FIG. 31 is an enlarged view of area A, circled in FIG. 30;

fig. 32 is an assembled schematic view of a post and cover plate of one embodiment provided herein.

Reference numerals

A battery pack 1000;

an explosion-proof valve 1; an exhaust direction 11;

a single battery 2; a housing 21; a side plate 211; a first side 2111; a second side 2112; a third side 2113; a cover plate 212; a step 2121; a first side 2122; a second side 2123; a cell 22; a cell body 221; current collector 222;

A pole group 3; a positive electrode post 31; a negative electrode post 32; a post 33; a first connection section 331; a second connecting section 332;

a first cooler 41; a second cooler 42; a second heat conductive member 43; a first heat conductive member 44; a connecting piece 46; a first connection portion 461; a second connecting portion 462; and a third connection 463.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. 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 discussion thereof is necessary in subsequent figures.

A battery pack 1000 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 32, the present invention provides a battery pack 1000, the battery pack 1000 including a unit cell 2, the unit cell 2 including a housing 21, a battery cell 22, and a plurality of poles 33.

Specifically, the housing 21 defines an accommodating space therein, the housing 21 has an edge extending along a first direction, a second direction and a third direction, the first direction and the second direction define a first plane, the first direction and the third direction define a second plane, the second direction and the third direction define a third plane, the housing 21 has at least a first surface, a second surface and a third surface, the first surface is connected with the second surface, the first surface is parallel to the third plane, the second surface is parallel to the second plane, the third surface is parallel to the first plane, the surface area of the second surface is larger than the surface area of the first surface, the cell 22 is arranged in the accommodating space, the post 33 is arranged on the cell 22 and extends out of the housing 21 from the second surface, and at least one of the posts 33 is a sheet.

In other words, the battery pack 1000 according to the embodiment of the present invention is mainly composed of the unit cells 2, and the unit cells 2 are mainly composed of the case 21, the battery cells 22, and the plurality of poles 33. An accommodating space is defined in the case 21, for example, the case 21 may be mainly composed of the side plate 211 and the cover plate 212, and the side plate 211 and the cover plate 212 may be mated to form an accommodating space, which may be used to accommodate the battery cell 22.

The outer surface of the housing 21 has a first edge, which may extend generally along a first direction, a second edge, which may extend generally along a second direction, and a third edge, which may extend generally along a third direction. Optionally, any two directions of the first direction, the second direction and the third direction are perpendicular to each other. It should be noted that, the first direction, the second direction and the third direction are not limited to the perpendicular relationship, so long as the first direction, the second direction and the third direction are not parallel to each other, and the protection scope of the present invention is included.

In addition, the first plane can be defined by the first direction and the second direction in a matching way, the second plane can be defined by the first direction and the third direction in a matching way, and the third plane can be defined by the second direction and the third direction in a matching way. For example, the first direction is the X-axis direction, the second direction is the Z-axis direction, the third direction is the Y-axis direction, and at this time, the first plane is the XZ plane, the second plane is the XY plane, and the third plane is the YZ plane. The outer surface of the housing 21 comprises at least a first surface, a second surface and a third surface, wherein the first surface and the second surface are interconnected, i.e. the first surface and the second surface can be butted. And the first surface is parallel to the third plane, the second surface is parallel to the second plane, and the third surface is parallel to the first plane. The second surface has a larger surface area than the first surface, and can provide a larger mounting space, for example, for mounting the pole 33, etc. Optionally, the area of the third surface is the largest, the area of the first surface is the smallest, for example, the unit cell 2 is a cuboid-like body, the first direction of the unit cell 2 is a length direction, the third direction is a thickness direction, the second direction is a height direction, the area of the front side and the rear side of the cuboid-like body is the largest, the area of the upper side and the lower side is larger than the area of the left side and the right side, the front side and the rear side are the third surface, the upper side and the lower side are the second surface, and the left side and the right side are the first surface.

The battery cell 22 may be composed of at least one battery cell body 221 and current collectors 222 connected with the corresponding battery cell bodies 221, wherein the number of the battery cell bodies 221 may be one or more, each battery cell body 221 may include a positive electrode plate, a membrane and a negative electrode plate, the current collectors 222 may be divided into a positive electrode current collector and a negative electrode current collector, the positive electrode current collector is connected with the positive electrode plate, and the negative electrode current collector is connected with the negative electrode plate. At least one electrode column group 3 is disposed on one cell body 221, the electrode column group 3 includes two electrode columns 33, and the two electrode columns 33 may be a positive electrode column 31 and a negative electrode column 32, wherein a positive electrode current collector is connected with the positive electrode column 31, and a negative electrode current collector is connected with the negative electrode column 32. That is, one or more pole groups 3 are disposed on the at least one cell body 221, and each pole group 3 extends out of the accommodating space, so as to facilitate connection and heat dissipation of external electric equipment. It should be noted that the number of pole pieces shown in the drawings is merely illustrative.

The terminal 33 is disposed on the battery cell 22 and protrudes from the second surface out of the housing 21, i.e., the terminal 33 may protrude through the second surface out of the receiving space, i.e., in the second direction, the terminal 33 may be disposed at a side of the battery cell body 221. Because the area of the second surface is greater than that of the first surface, the pole group 3 is arranged at the side part of the single battery 2 in the second direction, so that the space for installing the pole 33 is prevented from being reserved at the outer side of the single battery 2 in the first direction, the maximum size range of the battery cell body 221 in the first direction is increased, and the battery capacity is improved. In addition, since the area of the second surface is larger than that of the first surface, the cell body 221 can provide a larger mounting area on the second surface, improve the mounting convenience of the terminal group 3, and further enlarge the area and the overcurrent area of the terminal 33, for example, provide more terminals 33 on the second surface, or increase the size of the terminal 33 in a plurality of directions.

When the receiving space inside the case 21 is substantially the same shape as the outer contour of the case 21, the case 21 has edges extending in the first, second and third directions, and the cell body 221 also has edges extending in the first, second and third directions. For example, the housing 21 has a rectangular parallelepiped shape, the cell body 221 has a rectangular parallelepiped shape, the longitudinal direction of the cell body 221 may be parallel to the first direction, the height direction of the cell body 221 is parallel to the second direction, and the thickness direction of the cell body 221 is parallel to the third direction. In addition, in the present embodiment, the number of the terminal groups 3 on one cell body 221 may be one or more, and the terminal groups 3 are disposed on the side portion of the cell body 221 in the second direction, regardless of one or more terminal groups 3. It should be noted that, when the number of the pole groups 3 is plural, the present embodiment includes a case where not only one pole group 3 is on one side of the cell body 221, but also another pole group 3 is on the other side of the cell body 221; the situation that a plurality of pole groups 3 are simultaneously positioned on the same side of the battery core body 221 is also included; in addition, the number of the battery cell bodies 221 is plural, and the pole group 3 of each battery cell body 221 is located at a side portion of the corresponding battery cell body 221 in the second direction, and the description thereof is omitted herein. In the present embodiment, it is also not limited whether the positive electrode tab 31 and the negative electrode tab 32 in one tab group 3 are on the same side of the cell body 221.

In the case where the post 33 is located on the second surface, the explosion-proof valve 1 may be designed at a position such as the first surface of the cell body 221. In this embodiment, through avoiding setting up explosion-proof valve 1 at the second surface, avoided setting up explosion-proof valve 1 and utmost point post 33 concentrate at the second surface, can reserve more spaces for utmost point post 33 of this application, be convenient for further enlarge the area of utmost point post 33.

In addition, the size of the explosion-proof valve 1 can be designed according to the size of the first surface of the single battery 2, and the number of the explosion-proof valves 1 can be controlled, so that the system thermal safety of the battery pack 1000 is improved. The exhaust direction 11 of the explosion-proof valve 1 can flow outward substantially along the first direction, improving safety.

In the present embodiment, at least one of the poles 33 is a sheet. The total number of the electrode groups 3 included in the unit battery 2 may be one or more, and when the number of the electrode groups 3 is plural, the electrode 33 of different electrode groups 3 may be the same or different, which is not limited herein, so long as one electrode 33 adopts the novel sheet-shaped electrode 33 of the present application, that is, the protection scope of the present application.

Therefore, according to the single battery of the embodiment of the application, on one hand, the polar column 33 with at least one part of a sheet structure is adopted, the area of the outer surface of the polar column 33 is large, the overcurrent area of the polar column 33 and the current collector is large, and the battery adopting the polar column 33 has better quick charge capacity; on the other hand, by disposing the pole 33 on the second surface, the number and/or the area of the pole 33 can be increased, and the heat dissipation effect and the quick charge capability of the pole 33 can be further improved. It can be seen that, with respect to the prior art solution of disposing the conventional pole on the first surface with a smaller area, the pole 33 of the present application is disposed on the second surface with a larger area, which is beneficial for realizing top extraction, where top refers to the second surface being formed as the upper surface of the housing 21. And the size of the second surface is larger, so that the total area of the pole 33 is increased, the overcurrent area of the pole lug and the pole 33 can be increased, the heating degree is reduced, and the quick charging is facilitated.

Optionally, at least one of the positive electrode post 31 and the negative electrode post 32 of the electrode post group 3 is the electrode post 33 including the first connection section 331 and the second connection section 332, that is, the electrode post 33 mainly includes the first connection section 331 and the second connection section 332, where the first connection section 331 and the second connection section 332 are respectively connected, and the first connection section 331 may be used to connect with the current collector 222, for example, connect with the positive electrode current collector or the negative electrode current collector, where it is to be noted that the tab of the present application may be a junction of positive and negative electrode foils, the current collector 222 may be a structure formed after the tab is welded, and the current collector 222 and the tab at this time may be in two different states of the same material. It should be noted that, whether the tab and the current collector 222 are separately disposed or the tab and the current collector 222 are in the same structure, they are all within the protection scope of the present application.

Specifically, the first end of the second connecting section 332 is connected to the first connecting section 331, and the second end of the second connecting section 332 is used for connecting to external electric equipment. For example, the second connection section 332 is located at an upper side of the first connection section 331, a lower end of the first connection section 331 may be connected with the positive electrode current collector or the negative electrode current collector, an upper end of the first connection section 331 may be connected with a lower end of the second connection section 332, and an upper end of the second connection section 332 may be connected with external electric equipment.

It should be noted that at least one of the first connection section 331 and the second connection section 332 is a sheet-like body, that is, the post 33 includes the following cases: in the first case, only the first connection section 331 is a sheet; in case two, only the second connecting section 332 is a sheet; in the third case, the first connecting section 331 and the second connecting section 332 are each a sheet-like body.

The conventional pole in the prior art is a cylindrical body, the conventional pole is arranged at the end part of the battery cell, the diameter of the cylindrical body needs to be smaller than the thickness of the battery cell, and the surface area of the cylindrical body is related to the diameter, so that the surface area of the cylindrical body is smaller. In contrast, at least a part of the pole 33 in the present application is a sheet structure, the thickness of the sheet is small, and the dimensions in the directions on the sheet may be different from each other, even if the thickness of the sheet is smaller than the thickness of the battery cell 22, the sheet may be expanded by expanding the dimensions in other directions to increase the total area of the pole 33, for example, when the thickness direction of the sheet is the front-rear direction, the sheet may be expanded by expanding the dimensions in the length direction and the height direction. Wherein when at least the first connection section 331 adopts a sheet structure, not only the area of the pole 33 but also the flow-through area of the current collector 222 can be increased. The heat dissipation effect can be improved by increasing the area of the pole 33, and the heating degree can be reduced by increasing the overcurrent area, so that the technical problem that the quick charge capacity of the battery with the conventional pole in the prior art is limited is solved.

That is, since at least a portion of the tab 33 is of a sheet structure, sheet-like extraction of the tab 33 can be achieved by the tab 33 being fitted with the current collector 222 and the cell body 221, and the total number of extracted sheet-like extraction tabs 33 may be one but is not limited to one. The area of the polar column 33 and the flow-through area of the current collector 222 can be increased by the sheet structure, so that the quick charge capability of the single battery 2 is improved.

Wherein the pole group 3 includes, but is not limited to, the following: in case one, only the positive electrode 31 in one electrode group 3 is the electrode 33 having the first connecting section 331 and the second connecting section 332; in the second case, only the negative electrode 32 in one electrode group 3 is the electrode 33 having the first connecting section 331 and the second connecting section 332; in case three, the positive electrode tab 31 and the negative electrode tab 32 in one tab group 3 are each the tab 33 having the first connection section 331 and the second connection section 332. The heat problem in the quick charging process can be solved by adopting the pole 33 with the first connecting section 331 and the second connecting section 332, so that the single battery 2 of the application also has the same advantages, and is beneficial to realizing the quick charging, and the details are omitted here.

As shown in fig. 32, the maximum length of the pole 33 may be defined as L1, the length of the cover 212 may be defined as L2, the gap between the pole 33 and the end of the cover 212 in the length direction may be defined as L3, the gap between two adjacent poles 33 may be defined as L4, the number of poles 33 may be defined as N, and the following formula may be provided between the respective parameters: l1= (L2-l3×2- (N-1) L4)/N.

According to one embodiment of the present application, as shown in fig. 2, at least one of the poles 33 is an integral piece, i.e. the positive pole 31 and/or the negative pole 32 is an integral piece. That is, the pole 33 may be manufactured by an integral molding process, such as a stamping process, and includes both the first and second connection sections 331 and 332. In the present embodiment, by employing the integrally formed pole 33, the process is facilitated, and the step of connecting the first connecting section 331 and the second connecting section 332 together can be omitted.

In some embodiments of the present application, as shown in fig. 4, at least one of the poles 33 is a rectangular piece, that is, the positive pole 31 and/or the negative pole 32 is a rectangular piece, that is, the first connection section 331 and the second connection section 332 may be combined to form a rectangular piece, which is a plate-shaped piece. That is, the first and second connection sections 331 and 332 may extend along the same plane, for example, the first connection section 331 is located at an upper side of the second connection section 332, and the first and second connection sections 331 and 332 extend in the up-down direction, respectively, and are located at the same horizontal plane. In this embodiment, the pole 33 with a rectangular structure is used to facilitate connection between the pole 33 and the current collector 222 and external electric equipment, for example, one side of the rectangular member is connected to the current collector 222, so as to ensure a sufficiently large overcurrent area. In addition, by adopting the rectangular member, it is advantageous to increase the area of the post 33 and the overcurrent area of the current collector 222 at the same time, thereby further improving the quick charge capability of the unit cell 2.

Further, when the pole 33 is a rectangular member, as shown in fig. 2, the pitch between both side surfaces of the pole 33 in the thickness direction thereof is uniform, for example, the length direction of the pole 33 extends in the horizontal direction, the height direction extends in the up-down direction, and the thickness direction extends in the front-back direction, and the pitch between the front surface and the rear surface of the pole 33 is the same for a plurality of positions on the pole 33. In the present embodiment, the improvement of the processing efficiency and the improvement of the heat radiation uniformity are facilitated by adopting the sheet-like pole 33 of a uniform thickness.

In some embodiments of the present application, as shown in fig. 15 to 24, the positive electrode tab 31 of the tab group 3 is disposed at one end of the cell body 221 in the second direction, and the negative electrode tab 32 is disposed at the other end of the cell body 221 in the second direction.

For example, as shown in fig. 15 to 17, the first direction of the housing 21 extends in the left-right direction, and the second direction extends in the up-down direction. When the number of the electrode groups 3 on the battery cell body 221 is one, the electrode groups 3 include one positive electrode 31 and one negative electrode 32, the positive electrode 31 is located above the battery cell body 221, and the negative electrode 32 is located below the battery cell body 221, i.e. a structure of different-side monopolar electrodes 33 is formed, as shown in fig. 17, the current direction inside the battery cell body 221 is from top to bottom during charging. As shown in fig. 18 to 21, when the number of the electrode groups 3 on the cell body 221 is plural, the number of the corresponding positive electrode columns 31 and negative electrode columns 32 is plural, each positive electrode column 31 is located at the upper portion of the cell body 221, and each negative electrode column 32 is located at the lower portion of the cell body 221, that is, plural positive electrode columns 31 are simultaneously provided at the upper portion of the cell body 221, and plural negative electrode columns 32 are simultaneously provided at the lower portion of the cell body 221. As another example, as shown in fig. 21, the number of the cell bodies 221 is one, the number of the electrode column groups 3 is two, and for convenience of explanation, the two electrode column groups 3 are divided into a first electrode column group and a second electrode column group, the positive electrode column 31 of the first electrode column group and the positive electrode column 31 of the second electrode column group are respectively located at the upper part of the cell body 221, and the negative electrode column 32 of the first electrode column group and the negative electrode column 32 of the second electrode column group are respectively located at the lower part of the cell body 221. During charging, the current direction inside the battery cell body 221 is from top to bottom. When the number of the cell bodies 221 is two, the two cell bodies 221 may be sequentially arranged along the first direction, the positive electrode post 31 of each cell body 221 may be located on the upper side of the corresponding cell body 221, and the negative electrode post 32 of each cell body 221 may be located on the lower side of the corresponding cell body 221, that is, the positive electrode post 31 and the negative electrode post 32 of the electrode post group 3 are located on the opposite side of the cell body 221, which may include a case that one or more electrode post groups 3 are provided on one cell body 221, or may include a case of one or more cell bodies 221.

According to one embodiment of the present application, as shown in fig. 1 to 14, the positive electrode tab 31 and the negative electrode tab 32 of the tab group 3 are provided at the same end of the cell body 221 in the second direction. For example, the cell body 221 extends in the horizontal direction, and the positive electrode tab 31 and the negative electrode tab 32 of one tab group 3 are located at the same time in the upper portion of the cell body 221 or at the same time in the lower portion of the cell body 221. One or more electrode tab groups 3 may be disposed on one cell body 221, and the positive electrode tab 31 and the negative electrode tab 32 of at least one electrode tab group 3 are simultaneously located at the same end of the cell body 221 in the second direction. That is, in the present embodiment, whether one cell body 221 has only one electrode column group 3 or a plurality of electrode column groups 3, it is within the scope of the present application that the positive electrode column 31 and the negative electrode column 32 of at least one electrode column group 3 are located at the same end of the cell body 221 in the second direction at the same time.

Optionally, when the number of the cell bodies 221 is two, each cell body 221 has one pole group 3, and for convenience of explanation, the two pole groups 3 are divided into a first pole group and a second pole group. Here, the first case may include, but is not limited to, two cell bodies 221 distributed in the up-down direction, the positive electrode tab 31 and the negative electrode tab 32 of the first electrode tab group being located at the upper portion of one cell body 221, and the positive electrode tab 31 and the negative electrode tab 32 of the second electrode tab group being located at the lower portion of the other cell body 221. The second case is: the two electric core bodies 221 are distributed along the left-right direction, the first pole group is positioned at the upper part of one electric core body 221, the second pole group is positioned at the upper part of the other electric core body 221, and when charging, the current conduction direction inside the two electric core bodies 221 is as follows: the positive electrode 31 of the first electrode group on the left side passes through the inside of the left cell body 221 and is wound back to the negative electrode 32 of the first electrode group; from the positive pole 31 of the second pole group on the right side, through the inside of the right-hand cell body 221, back to the negative pole 32 of the second pole group.

It can be seen that the positive electrode 31 and the negative electrode 32 of the cell body 221 can be designed on the same side or on different sides. For the same-side homopolar design on one cell body 221, the poles 33 can be flexibly distributed on the cover plate 212 according to the actual required size of the poles 33 and the height of the manufactured poles 33. For the design of different polarities on the same side of one cell body 221, not only the overcurrent of the current collector 222 can be increased, but also the current trend can be changed, the current conduction path can be shortened, and the heat generation can be effectively reduced.

In some embodiments of the present application, as shown in fig. 12 to 14 and fig. 22 to 24, the number of the cell bodies 221 is plural, and the plurality of cell bodies 221 are sequentially distributed along the first direction, and at least one pole group 3 is disposed on each cell body 221. For example, the number of the battery cell bodies 221 is two, and the battery cell bodies are divided into a first battery cell body and a second battery cell body, the first battery cell body is located at the left side of the second battery cell body, at least one pole group 3 is respectively arranged on the first battery cell body and the second battery cell body, and the positive pole 31 and the negative pole 32 of the pole group 3 can be located at the same side or different sides of the corresponding battery cell bodies 221.

In some embodiments of the present application, as shown in fig. 4 to 6, 12 to 14, and 18 to 24, the number of the pole groups 3 on one unit cell 2 is plural, and the plural pole groups 3 are spaced apart in the first direction. For example, the first direction of the battery cell body 221 extends along the left-right direction, and the plurality of pole groups 3 on one battery cell body 221 are distributed at intervals along the left-right direction, and when the number of the pole groups 3 is two, the battery cell body is divided into a first pole group and a second pole group, the positive pole 31 of the first pole group may be located at the left side of the positive pole 31 of the second pole group, and the negative pole 32 of the first pole group may be located at the left side of the negative pole 32 of the second pole group. When the unit battery 2 includes two battery cell bodies 221, the distribution of the electrode post groups 3 on the first battery cell body and the second battery cell body may be the same or different, for example, the first battery cell body corresponds to the first electrode post group, the second battery cell body corresponds to the second electrode post group, the positive electrode post 31 and the negative electrode post 32 of the first electrode post group may be located on the same side or different sides of the first battery cell body, and the positive electrode post 31 and the negative electrode post 32 of the second electrode post group may be located on the same side or different sides of the second battery cell body. That is, in the present embodiment, whether there is one cell body 221, the cell body 221 has a plurality of terminal groups 3 thereon; or a plurality of battery cell bodies 221, each battery cell body 221 is provided with at least one pole group 3, so long as the plurality of pole groups 3 in the single battery 2 are distributed along the first direction, the protection scope of the present application is provided. In addition, the positive electrode posts 31 and the negative electrode posts 32 in the electrode post set 3 may be arranged along the third direction, or may be arranged along the second direction on the same side or different sides of the battery core body 221, which all belong to the protection scope of the present application.

According to an embodiment of the present application, as shown in fig. 7 and 8, the number of the electrode groups 3 on one cell body 221 is multiple, the multiple electrode groups 3 are spaced apart in a third direction, any two of the first direction, the second direction and the third direction are perpendicular to each other, for example, the first direction is a left-right direction, the second direction is an up-down direction, the third direction is a front-back direction, the multiple electrode groups 3 are disposed on one cell body 221, the multiple electrode groups 3 can be distributed along the front-back direction, when the number of the electrode groups 3 is two, the two electrode groups 3 can be divided into a first electrode group and a second electrode group, the first electrode group is located at the rear side of the second electrode group, the positive electrode 31 of the first electrode group is located at the rear side of the positive electrode 31 of the second electrode group, and the negative electrode 32 of the second electrode group is located at the rear side of the negative electrode 32 of the second electrode group.

In some embodiments of the present application, the pole 33 is welded to the corresponding current collector 222, and the connection between the pole group 3 and the corresponding current collector 222 is improved by adopting a welding manner.

According to one embodiment of the present application, the post 33 is in surface contact with the corresponding current collector 222, and the overcurrent area is increased by using a larger contact area.

According to one embodiment of the invention, the battery pack 1000 further includes a cooler disposed on a side of the pole 33 remote from the second surface and in thermal communication with the pole 33 and the second surface, respectively. By providing the cooler, the heat of the pole 33 can be extracted, the heat radiation capability of the single battery 2 is improved, and the quick charge is facilitated.

In some embodiments of the present invention, the number of coolers is two, and the unit cell 2 is located between the two coolers. That is, the battery pack 1000 further includes two coolers, which are divided into a first cooler 41 and a second cooler 42. For example, the unit cells 2 have a length direction and a height direction, the length direction of the unit cells 2 is larger than the height direction, the length direction extends substantially in the horizontal direction, the height direction extends substantially in the up-down direction, the first cooler 41 may be located above the unit cells 2, and the second cooler 42 may be located below the unit cells 2.

In the present embodiment, the upper portion of the battery cell 2 can be thermally conducted by the first cooler 41, and the lower portion of the battery cell 2 can be thermally conducted by the second cooler 42. In the conventional battery system, a single-sided cooling manner is adopted, which causes a larger temperature difference in the height direction of the battery, but in the embodiment, the first cooler 41 and the second cooler 42 are matched, so that a sandwich-like cooling structure can be formed, the temperature difference in the height direction of the single battery 2 is reduced, and the first cooler 41 and the second cooler 42 are respectively arranged on the outer side of the single battery 2 in the second direction, so that heat dissipation in the second direction is realized, and the heat dissipation efficiency in the second direction can be improved by matching the sheet-shaped polar column 33 extending approximately in the second direction, and a larger degree of heat dissipation to the polar lug, the polar column 33 and other parts of the single battery 2 can be realized.

In some embodiments of the present invention, as shown in fig. 28, the battery pack 1000 further includes a heat transfer member 46, at least a portion of the heat transfer member 46 being located between the cooler and the pole 33 and being capable of transferring heat from the pole 33 and the second surface to the cooler. That is, the heat transfer member 46 may function to conduct heat. At least a portion of the heat of the battery cell 2, particularly near the pole 33 and the second surface, may be transferred to the cooler via the heat transfer member 46, enabling rapid heat dissipation of the battery cell 2, facilitating rapid charging.

In the present embodiment, by providing the heat transfer member 46, the problems of difficulty in installation, low firmness of the cooler and the pole 33 are solved, and when the pole 33 is connected to the cooler through the heat transfer member 46, the cooler may be located outside the heat transfer member 46, and the pole 33 may be located inside the heat transfer member 46.

According to one embodiment of the invention, the heat transfer member 46 includes a first heat conducting member 44, the first heat conducting member 44 being provided on the second surface and in heat transfer with the pole 33 and the cooler, respectively. That is, the first heat conductive member 44 may be mounted on the second surface and is capable of transferring heat of the pole 33 to the cooler. The first heat conducting member 44 may be directly or indirectly connected to the pole 33 and the cooler, and is not limited herein, and it is within the scope of the present application to use the first heat conducting member 44 that can conduct heat.

In some embodiments of the present invention, the number of the poles 33 is plural in the third direction, and two adjacent poles 33 are respectively connected to one first heat conductive member 44. For example, the third direction is a front-rear direction, and a plurality of poles 33 are provided along the front-rear direction, and the plurality of poles 33 may belong to the same or different single batteries 2. At least one first heat conducting member 44 is provided between the preceding pole 33 and the following pole 33, and heat of both poles 33 can be transferred to the first heat conducting member 44 and can be transferred from the first heat conducting member 44 to the location of the cooler. That is, the plurality of poles 33 can share one first heat conductive member 44, improving the compactness and space utilization.

According to an embodiment of the present invention, as shown in fig. 31, the heat transfer member 46 further includes a first connecting portion 461, a second connecting portion 462, and a third connecting portion 463 sequentially connected, the first connecting portion 461, the second connecting portion 462, and the third connecting portion 463 are cooperatively formed with receiving grooves for receiving the first heat conductive member 44, the first connecting portion 461 is connected with one of the two poles 33, the second connecting portion 462 is connected with the other of the two poles 33, the third connecting portion 463 is located between the first connecting portion 461 and the second connecting portion 462, the third connecting portion 463 is connected with the first connecting portion 461 and the second connecting portion 462, respectively, and the third connecting portion 463 may be thermally connected with the cooler. In the existing battery system, a thin connecting sheet is generally adopted, so that the overcurrent area is limited, and the heating is serious. The heat transfer member 46 of the present application includes the first connecting portion 461, the second connecting portion 462 and the third connecting portion 463, and has a bent contact design, so that the heat dissipation path can be enlarged, the heat dissipation effect can be improved, and the heat generation degree can be reduced. Further, as shown in fig. 31, the outer surface of the second connecting portion 462 is provided with a groove in the thickness direction thereof, so that the heat radiation effect can be improved. Further, the first, second and third connection parts 461, 462 and 463 can protect the sheet-like pole 33 from deformation by external force.

For example, the third direction is a front-rear direction, the first connection portion 461 and the second connection portion 462 may be spaced apart in the front-rear direction, the third connection portion 463 may be located between the first connection portion 461 and the second connection portion 462, and the rear end of the third connection portion 463 is connected to the first connection portion 461, and the front end of the third connection portion 463 is connected to the second connection portion 462. The first heat conductive member 44 is located between the first connecting portion 461 and the second connecting portion 462, and is thermally connected to the first connecting portion 461, the second connecting portion 462, and the third connecting portion 463, respectively. Further, the third connection 463 is thermally connected to the cooler.

In some embodiments of the present application, a second fluid passage is provided in the cooler for cooling fluid flow, the cooler being in thermally conductive connection with the heat transfer member 46. That is, the cooler is provided with a fluid passage, and in this case, the cooler can be used as a liquid cooling plate, and the heat radiation effect to the vicinity of the pole 33 can be improved.

According to one embodiment of the present application, the at least one pole 33 is parallel to the first plane, where the length direction of the at least one pole 33 extends in a first direction and the height direction of the pole 33 extends in a second direction. That is, the pole 33 has a length direction and a height direction, the length direction of the pole 33 may be parallel to the first direction, and the height direction of the pole 33 may be parallel to the second direction. In the present embodiment, by defining the length direction and the height direction of the pole 33 to be the same as the extending direction of the housing 21, not only is the assembly of the pole 33 and the cover plate 212 facilitated, but also the sharing of one first heat conductive member 44 by the two poles 33, and also the sharing of one heat transfer member 46 by the two poles 33 is facilitated.

According to one embodiment of the present application, the housing 21 includes a side plate 211 and a cover plate 212, the side plate 211 includes a first side portion 2111 and a second side portion 2112, the side plate 211 has a first surface and a third surface, the cover plate 212 is disposed on the side plate 211 and encloses with the side plate 211 to form an accommodating space, a through mounting hole is disposed on the cover plate 212, the pole 33 passes through the mounting hole, the first side portion 2111 extends along a second direction, the second side portion 2112 extends along the first direction, a first end of the second side portion 2112 is connected with an end of the first side portion 2111 in the second direction, a second end of the second side portion 2112 extends along a direction away from the first side portion 2111, and the second side portion 2112 is connected with the cover plate 212.

Wherein, the cover plate 212 may be, but not limited to, an aluminum cover plate (thickness range may be 0.5-3.5 mm) or a steel cover plate (thickness range: 0.2-2 mm), and the side plate 211 may be, but not limited to, an aluminum plate (thickness range may be 0.3-2 mm) or a steel plate (thickness range may be 0.1-1 mm).

For example, the case 21 is mainly composed of a side plate 211 and a cover plate 212, wherein the side plate 211 encloses the above-mentioned accommodation space, and the cover plate 212 may be located at one side of the side plate 211, i.e., at the outer side in the axial direction of the accommodation space, the accommodation space having an open end communicating therewith. The cover 212 is connected to the side plate 211, and the open end can be closed by the cover 212. The cover plate 212 is provided with mounting holes, which may extend in the thickness direction of the cover plate 212. One of the first connection segments 331 and the current collectors 222 is connected to the other of the first connection segments 331 and the current collectors 222 through a mounting hole, for example, the first connection segments 331 are connected to the current collectors 222 through a mounting hole, or the current collectors 222 are connected to the first connection segments 331 through a mounting hole, i.e., either the first connection segments 331 or the current collectors 222 pass through a mounting hole.

In the present embodiment, the mounting holes are formed in the cover plate 212, so that the connection between the post 33 and the current collector 222 is facilitated. When the pole pieces 33 are provided on both sides of the housing 21, open ends may be provided at both ends of the accommodating space.

According to an embodiment of the present application, the cross-sectional area of the side of the current collector 222 near the cell body 221 is larger than the cross-sectional area of the side of the current collector 222 near the first connection section 331, which is favorable for connecting the current collector 222 with the first connection section 331, avoiding that the current collector 222 occupies too large space to interfere with the connection between the current collector and the first connection section 331, and in addition, ensuring the overcurrent area.

Optionally, the current collector 222 includes a first segment and a second segment, the cross section of the first segment is triangular, one side of the first segment is connected with the battery core 22, the second segment is connected with one vertex of a side of the first segment away from the battery core 22, the second segment is connected with the first connection segment 331, and the current collector 222 is effectively connected with the battery core 221 and the first segment through the cooperation of the first segment and the second segment, and the current passing area of the current collector 222 can be increased.

According to an embodiment of the present application, the second segment body is welded with the first connecting segment 331, enabling a reliable connection between the second segment body and the first connecting segment 331.

Optionally, the cover plate 212 is welded to the side plate 211, so as to improve the connection firmness between the cover plate 212 and the side plate 211, that is, the connection between the cover plate 212 and the side plate 211 is welded by laser or other welding methods.

According to one embodiment of the present application, as shown in fig. 26, the side plate 211 includes a first side portion 2111 and a second side portion 2112, the first side portion 2111 extends along a second direction, a first end of the second side portion 2112 is connected to an end of the first side portion 2111 in the second direction, a second end of the second side portion 2112 extends away from the first side portion 2111, the second side portion 2112 is connected to the cover plate 212, and an included angle may be formed between the second side portion 2112 and the first side portion 2111. For example, the first side portion 2111 extends in the up-down direction, the inner end of the second side portion 2112 is connected to the upper end of the first side portion 2111, and the outer end of the second side portion 2112 extends toward the outside and extends in the horizontal direction. In the present embodiment, by employing the first side portion 2111 and the second side portion 2112 to cooperate, a stable connection between the second side portion 2112 and the cover plate 212 can be achieved. At the time of welding, it is possible to weld in the arrow direction in fig. 26 at the position indicated by the arrow.

The contact area between the side plate 211 and the cover plate 212 in the prior art is small, and is limited by low welding firmness, so that the cover plate 212 cannot be designed to be large in size, the arrangement space of the polar posts 33 is limited, the overcurrent area of the polar posts and the polar lugs is small, heating is high, and quick charging is limited. Therefore, the welding can be directly performed at a conventional thickness, and when the thickness of the cover plate 212 is too thin, for example, 0.5mm or less, the cover plate 212 or the side plate 211 can be curled or locally thickened by adopting the design of the following embodiment.

In some embodiments of the present application, as shown in fig. 25, the side plate 211 further includes a third side portion 2113, a first end of the third side portion 2113 is connected to a second end of the second side portion 2112, the second end of the third side portion 2113 extends toward a direction in which the first side portion 2111 is located, and the third side portion 2113 is stacked with the second side portion 2112 in the first direction. For example, the first side portion 2111 extends in the up-down direction, the inner end of the second side portion 2112 is connected to the upper end of the first side portion 2111, the outer end of the second side portion 2112 extends toward the outside, and extends in the horizontal direction, the outer end of the third side portion 2113 is connected to the outer end of the second side portion 2112, the inner end of the third side portion 2113 extends toward the position where the first side portion 2111 is located, i.e., the second side portion 2111 is located above the third side portion 2113 in the up-down direction, and the second side portion 2111 and the third side portion 2113 cooperate to form a burring structure. In this embodiment, the thickness can be increased by crimping the second side portion 2111 and the third side portion 2113 in cooperation. At the time of welding, it is possible to weld in the arrow direction in fig. 25 at the position indicated by the arrow.

It should be noted that, the connection between the cover plate 212 and the side plate 211 can flexibly design the length of the cover plate 212 according to the thickness matching between the cover plate 212 and the side plate 211, so as to increase the arrangeable space of the pole 33 and increase the overcurrent.

According to one embodiment of the present application, a stepped portion 2121 is disposed on a side of the cover plate 212 adjacent to the accommodating space, in a first direction, the cover plate 212 includes a first side 2122 and a second side 2123 which are spaced apart from each other, the first side 2122 is abutted to an edge of the cover plate 212, a thickness of a position of the cover plate 212 corresponding to the first side 2122 is smaller than a thickness of a position of the cover plate 212 corresponding to the second side 2123, and an end surface of the side plate 211 in the first direction is connected to the first side 2122. For example, as shown in fig. 27, a step 2121 is disposed on a side of the cover plate 212 near the accommodating space, in the first direction, the cover plate 212 includes a first side 2122 and a second side 2123 that are distributed at intervals, the first side 2122 is abutted to an edge of the cover plate 212, a thickness of a position on the cover plate 212 corresponding to the first side 2122 is smaller than a thickness of a position on the cover plate 212 corresponding to the second side 2123, an end surface of the side plate 211 in the first direction is connected to the first side 2122, local thickening is achieved through the step 2121, and welding feasibility and welding quality are improved. At the time of welding, it is possible to weld in the arrow direction in fig. 27 at the position indicated by the arrow.

In some embodiments of the present application, as shown in fig. 27-31, the battery pack 1000 of the present application further includes a tray and a heat sink assembly, and a cooler may be provided as at least a portion of the heat sink assembly. Specifically, an accommodating space is defined in the tray, the single battery 2 is located in the accommodating space, the heat dissipation assembly is located in the accommodating space, and the heat dissipation assembly is in heat conduction connection with the single battery 2. The heat of the single battery 2 can be timely led out by adopting the heat dissipation assembly, so that the heat dissipation efficiency is improved, and the realization of quick charge is facilitated.

According to an embodiment of the present application, the number of the single cells 2 is plural, the plurality of single cells 2 are sequentially arranged along the third direction, and the first heat conductive members 44 are respectively heat-conductively connected with the poles 33 of the two single cells 2 adjacently arranged in the third direction.

That is, the number of the unit cells 2 is plural, and the plural unit cells 2 are sequentially arranged in the third direction, which may be the thickness direction of the unit cells 2. Each cell 2 may have one or more cell bodies 221. The first heat conductive members 44 are respectively heat-conductively connected to the poles 33 of the two unit cells 2 disposed adjacently in the third direction. For example, in the third direction, the number of the single cells 2 is two, and is divided into a first single cell and a second single cell, the first single cell has a first pole group, the second single cell has a second pole group, one pole 33 of the first pole group is located at the upper portion of the first single cell, one pole 33 of the second pole group is also located at the upper portion of the second single cell, and further, since the first single cell and the second single cell are sequentially arranged along the third direction, at least one pole 33 of the first single cell and at least one pole 33 of the second single cell are adjacently arranged in the third direction with a gap therebetween. The first heat-conducting member 44 is provided at the gap position, and the heat conduction to the poles 33 of the two unit cells can be simultaneously achieved by one first heat-conducting member 44. Alternatively, in the first direction, the length of the first heat conducting member 44 may be equal to or greater than the length of the pole 33, and when equal to or greater than the length of the pole 33, the heat dissipation effect on the pole 33 can be ensured, and when greater than the length of the pole 33, the heat transfer of the pole 33 to a greater extent is facilitated.

Further, the first heat conductive member 44 is in surface contact with the pole 33, so that the heat transfer effect can be increased.

According to one embodiment of the present application, the heat dissipation assembly further comprises a second heat conducting member 43, the second heat conducting member 43 being located between the cooler and the third connection portion 463 and being in heat conducting connection with the cooler and the third connection portion 463, respectively. That is, the heat exchange between the unit cells 2 and the cooler, particularly, the heat removal near the third connection portion 463 can be achieved by the second heat conductive member 43. In the present embodiment, by providing the second heat conductive member 43, it is avoided that the unit cells 2 are easily damaged due to direct contact of the cooler with the unit cells 2, on the one hand, and that the cooler needs to be designed to be excessively large, on the other hand. Also, when the number of the unit cells 2 is plural, one second heat conductive member 43 may correspond to the plural unit cells 2.

According to one embodiment of the present application, the heat transfer member 46 is welded to the pole 33, and the connection reliability can be increased by welding. Further, the side surface of the post 33 is in surface contact with the heat transfer material 46, for example, the longitudinal direction of the post 33 extends in the up-down direction and the height direction extends in the left-right direction, and the side surface of the post 33 in the thickness direction of the cell body 221 is in contact with the side surface of the heat transfer material 46, whereby the welding area between the post 33 and the heat transfer material 46 can be increased. Alternatively, the heat transfer member 46 is bonded to the cooler, enabling an improvement in assembly efficiency.

According to one embodiment of the present application, the cooler and the second heat conductive member 43 are each a sheet-like body, and the second heat conductive member 43 is in surface contact with the cooler and the unit cell 2, for example, with the third connecting portion 463, respectively. For example, the upper end surface of the second heat conductive member 43 is in contact with the lower end surface of the cooler, the lower end surfaces of the second heat conductive member 43 are in contact with the upper end surfaces of the unit cells 2, respectively, the heat conduction area is increased by the surface contact, and the stress balance and the heat dissipation balance of the plurality of positions on the unit cells 2 are increased, and when the number of the unit cells 2 is plural, the stress balance and the heat dissipation balance of the plurality of unit cells 2 are increased.

That is, the present application can increase the fast charging capability of the system by adding a high thermal conductive material design between the double-sided cooling structure, the heat transfer member 46 bending contact cooling, the pole 33 and the cover plate 212, and the heat transfer member 46 and the cover plate 212. May include, but is not limited to, the following heat dissipation paths: (1) Current collector 222→cover plate 212→first heat conducting member 44→heat transfer member 46→cooler; (2) The heat dissipation of the heat transfer piece 46 can be realized through the heat conduction structural adhesive and the cooler, so that the heat dissipation path is optimized integrally, and the quick charge capacity is improved.

According to one embodiment of the present application, the receiving space is open along at least one end in its axial direction, and the cooler serves as a bottom plate or top plate of the tray. For example, the first cooler 41 serves as a top plate of the tray, and the second cooler 42 serves as a bottom plate of the tray, so that the heat radiation effect can be improved, and the excessive space occupation caused by the existence of the top plate, the bottom plate, the first cooler 41, and the second cooler 42 in the height direction of the tray at the same time can be avoided.

The unit cell 2 according to the present application will be described in detail with reference to specific examples.

Example 1

As shown in fig. 1 to 3, the upper end of one cell body 221 has a positive electrode post 31 and a negative electrode post 32, the positive electrode post 31 and the negative electrode post 32 are spaced apart in the horizontal direction, i.e. the first direction is the left-right direction, and two posts 33 with different polarities are provided on the same side of the cell body 221, i.e. a sheet-like lead-out design of the same-side bipolar post 33 is adopted. As shown in fig. 3, the current flows from the positive electrode terminal 31 to the inside of the cell body 221 and then to the negative electrode terminal 32 during charging.

Example two

As shown in fig. 4 to 6, the upper end of one cell body 221 has two pole groups 3, which are divided into a first pole group and a second pole group, the first pole group is located at the left side of the second pole group, the positive pole 31 of the first pole group is located at the rear side of the negative pole 32 of the first pole group, the positive pole 31 of the second pole group is located at the rear side of the negative pole 32 of the second pole group, that is, the two poles 33 along the thickness direction of the cell body 221 are different in polarity, the length direction of the cell body 221 is the same in polarity, at this time, the first direction is the length direction of the cell 22 and the cell body 221, and the third direction is the thickness direction of the cell 22 and the cell body 221. The positions of the polar posts 33 are arranged in parallel or staggered in the thickness direction, so that the design can be flexibly realized. Taking the first pole group as an example, as shown in fig. 6, the charging current flows from the positive pole 31 to the inside of the cell body 221 and then to the negative pole 32.

Example III

As shown in fig. 7 to 8, the upper end of one cell body 221 has two pole groups 3, which are divided into a first pole group and a second pole group, the first pole group is located at the rear side of the second pole group, the positive pole 31 of the first pole group is located at the rear side of the positive pole 31 of the first pole group, the negative pole 32 of the first pole group is located at the rear side of the negative pole 32 of the second pole group, that is, the two poles 33 along the thickness direction of the cell body 221 are the same polarity, and are different in polarity along the length direction of the cell body 221, at this time, the first direction is the length direction of the cell 22 and the cell body 221, the third direction is the thickness direction of the cell 22 and the cell body 221, and the positions of the poles 33 are arranged in parallel or staggered manner in the thickness direction, which can be flexibly designed. Taking the first pole group as an example, the charging current flows from the positive pole 31 to the inside of the cell body 221 and then flows to the negative pole 32.

Example IV

As shown in fig. 9 to 11, the battery core body 221 is provided with two positive electrode posts 31 and two negative electrode posts 32, the two positive electrode posts 31 are located at the left sides of the two negative electrode posts 32, the four posts 33 are distributed at intervals along the first direction, and the direction of charging current is shown in fig. 11.

Example five

As shown in fig. 11 to 14, the number of the cell bodies 221 is two, and is divided into a first cell body and a second cell body, and the first cell body is located at the left side of the second cell body. The first electric core body is provided with a first pole group, and a positive pole 31 and a negative pole 32 of the first pole group are arranged on the upper side of the first electric core body. The second electric core body is provided with a second pole group, and the positive pole 31 and the negative pole 32 of the second pole group are arranged on the upper side of the second electric core body. Taking the first cell body as an example, as shown in fig. 14, the charging current flows from the positive electrode post 31 to the inside of the first cell body and then flows to the negative electrode post 32.

Example six

As shown in fig. 15 to 17, the cell body 221 is provided with a pole group 3, the positive pole 31 is located on the upper side of the cell body 221, and the negative pole 32 is located on the lower side of the cell body 221, that is, the opposite-side monopole 33 is adopted, as shown in fig. 17, the charging current flows from the positive pole 31 to the inside of the cell body 221 and then flows to the negative pole 32.

Example seven

As shown in fig. 18 to 21, two pole groups 3 are disposed on the battery body 221, the positive pole 31 of each pole group 3 is located on the upper side of the battery body 221, and the negative pole 32 of each pole group 3 is located on the lower side of the battery body 221, that is, the different-side bipolar pole 33 is adopted, as shown in fig. 21, the charging current flows from the positive pole 31 to the inside of the battery body 221, and then flows to the negative pole 32.

Example eight

As shown in fig. 22 to 24, the number of the cell bodies 221 is two, and is divided into a first cell body and a second cell body, and the first cell body is located at the left side of the second cell body. The first electric core body is provided with two first polar column groups, and the positive polar column 31 of every first polar column group sets up the upside at first electric core body, and negative polar column 32 sets up the downside at first electric core body. The positive electrode posts 31 of each second electrode post group are arranged on the upper side of the second electric core body, the negative electrode posts 32 are arranged on the lower side of the second electric core body, and the like electrode posts 33 are arranged along the length direction of the single battery 2. Taking the first cell body as an example, as shown in fig. 24, the charging current flows from the positive electrode post 31 to the inside of the first cell body and then flows to the negative electrode post 32.

In summary, according to the pole 33, the single battery 2 and the battery pack 1000 of the embodiment of the present application, the novel pole 33 structure and the heat dissipation assembly design matched with the high heat dissipation path are adopted, so that the high-rate quick charging capability is improved. Different from the traditional battery core with two positive and negative poles on the side, the battery core adopts the flaky leading-out poles 33, so that the space of the cover plate 212 is greatly utilized, the heat dissipation area of the current collector 222 is increased, the current conduction path is reduced, the heating impedance is reduced, and the quick charging capacity of the battery core is improved; in one embodiment, the cover plate and the side plate are designed in a curled edge or local thickening way, so that the thin cover plate is reliably connected; in yet another embodiment, the power cell's fast charge capability is improved overall in combination with a high heat dissipation design, such as a double sided arrangement of coolers, a heat transfer member 46 in cooperation with the coolers, a high thermal conductivity material to carry away the temperature rise of the pole 33 in multiple directions.

The present application also proposes a vehicle comprising the battery pack 1000 of any of the above embodiments. Because the battery pack 1000 has a good heat dissipation effect, the fast charge capability is improved, and the vehicle of the application also has the advantage of high fast charge capability, which is not described herein.

Although specific embodiments of the present application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. A battery pack, wherein the battery pack comprises a single battery, the single battery comprising:

a housing defining a receiving space therein, the housing having a rim extending in a first direction, a second direction and a third direction, the first direction and the second direction defining a first plane, the first direction and the third direction defining a second plane, the second direction and the third direction defining a third plane, the housing having at least a first surface, a second surface and a third surface, the first surface being connected to the second surface and the first surface being parallel to the third plane, the second surface being parallel to the second plane, the third surface being parallel to the first plane, the second surface having a surface area greater than a surface area of the first surface;

The battery cell is arranged in the accommodating space;

the electrode posts are arranged on the battery core and extend out of the shell from the second surface, and at least one electrode post is a sheet body.

2. The battery pack of claim 1, further comprising:

and the cooler is arranged on one side of the pole away from the second surface and is respectively in heat conduction with the pole and the second surface.

3. The battery pack according to claim 2, wherein the number of the coolers is two, and the unit cells are located between the two coolers.

4. The battery pack according to claim 2, further comprising:

and a heat transfer member, at least a portion of which is located between the cooler and the pole and which enables heat transfer from the pole and the second surface to the cooler.

5. The battery pack of claim 4, wherein the heat transfer member comprises:

and the heat conduction piece is arranged on the second surface and is in heat transfer with the pole and the cooler respectively.

6. The battery pack according to claim 5, wherein in the third direction, the number of the poles is plural, and two adjacent poles are respectively connected to one of the heat conductive members.

7. The battery pack according to claim 6, wherein the heat transfer member further comprises a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence, the first connecting portion, the second connecting portion, and the third connecting portion being formed with receiving grooves for receiving the heat transfer member, the first connecting portion being connected to one of the two poles, the second connecting portion being connected to the other of the two poles, the third connecting portion being located between the first connecting portion and the second connecting portion, the third connecting portion being connected to the first connecting portion and the second connecting portion, respectively.

8. The battery pack of claim 4, wherein a second fluid passage is provided in the cooler for flow of cooling fluid, the cooler being in thermally conductive connection with the heat transfer member.

9. The battery pack of claim 1, wherein the posts are parallel to the first plane.

10. The battery pack of claim 1, wherein the housing comprises:

a side plate having the first surface and the third surface;

The cover plate is arranged on the side plate and surrounds the side plate to form the accommodating space, a through mounting hole is formed in the cover plate, and the pole penetrates through the mounting hole;

the side plate includes:

a first side portion extending in the second direction;

and a second side portion extending along the first direction, a first end of the second side portion being connected to an end of the first side portion in the second direction, a second end of the second side portion extending in a direction away from the first side portion, the second side portion being connected to the cover plate.

11. The battery pack of claim 10, wherein the side plate further comprises:

and the first end of the third side part is connected with the second end of the second side part, the second end of the third side part extends towards the direction where the first side part is located, and the third side part and the second side part are stacked in the first direction.

12. The battery pack according to claim 10, wherein the cover plate is provided with a stepped portion on a side thereof adjacent to the receiving space, the cover plate includes first and second side surfaces spaced apart in the first direction, the first side surface is abutted against an edge of the cover plate, a thickness of a position of the cover plate corresponding to the first side surface is smaller than a thickness of a position of the cover plate corresponding to the second side surface, and an end surface of the side plate in the first direction is connected to the first side surface.

13. A vehicle comprising the battery pack of any one of claims 1-12.