WO2024178977A1 - Battery pack and vehicle - Google Patents

Abstract

A battery pack and a vehicle. The battery pack comprises a case, cells, and thermal management components; the plurality of thermal management components are arranged at intervals in the case in a first direction; each thermal management component comprises a plurality of first flat plate portions, a plurality of second flat plate portions, and a plurality of connecting portions; the first flat plate portions and the second flat plate portions are alternately arranged in a second direction and connected by means of the connecting portions, and a gap is formed between the side wall surfaces, on the same side in the first direction, of each first flat plate portion and the second flat plate portion adjacent thereto; a first accommodating space and a second accommodating space which are communicated with each other are defined by every two adjacent thermal management components; cells are arranged in the first accommodating space and the second accommodating space; on the basis of the gap, a distance is also provided between the cells in the first accommodating space and the second accommodating space on the same side in the second direction, so that the overlapping area between cells is reduced, and the thermal resistance between the cells can be reduced, thereby improving the safety of the battery pack.

Description

Battery pack and vehicle

Cross-references to related documents

This application claims priority to Chinese patent application number 202320458287.7, entitled “A Battery Pack and Vehicle,” filed with the State Intellectual Property Office of China on March 1, 2023, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of battery technology, and in particular to a battery pack and a vehicle.

Background Art

A battery pack is generally composed of a plurality of single cells. In practical applications, a thermal management component is provided in the battery pack for thermal management of the single cells to ensure the performance of the battery pack.

Most battery packs use straight-plate thermal management components clamped on both sides of the single cells, so that adjacent single cells are completely opposite to each other. When one of the single cells experiences thermal runaway, the heat quickly spreads to the remaining single cells, and the thermal safety of the battery pack is poor.

Application Contents

The purpose of this application is to improve the thermal safety of the battery pack.

In order to achieve the above objectives, the present application provides a battery pack, comprising:

A box having a first direction and a second direction intersecting each other;

A plurality of single cells are arranged in the box;

A plurality of heat management components are arranged in the box body at intervals along a first direction, the heat management components include: a plurality of first flat plate portions, a plurality of second flat plate portions and a plurality of connecting portions, at least some of the first flat plate portions and the second flat plate portions are alternately arranged along a second direction, and there is a spacing between the side wall surfaces of the adjacent first flat plate portions and the second flat plate portions on the same side in the first direction along the first direction, and the connecting portion is arranged between the first flat plate portions and the second flat plate portions;

The first flat plate portions of at least two adjacent thermal management components are arranged opposite to each other along a first direction and define a first accommodating space, and the second flat plate portions of at least two adjacent thermal management components are arranged opposite to each other along the first direction and define a second accommodating space. The first accommodating space is communicated with the second accommodating space, and at least one single battery is disposed in each of the first accommodating space and the second accommodating space.

Optionally, the single cell is arranged between two adjacent connecting parts of the thermal management component, and the single cell has a third side wall and a fourth side wall arranged opposite to each other along the second direction, and along the second direction, the projection of the connecting part on the plane where the third side wall is located at least partially covers the third side wall; and/or, the projection of the connecting part on the plane where the fourth side wall is located at least partially covers the fourth side wall.

Optionally, along the first direction, there is a first distance D ₁ mm between the first flat plate portion and the second flat plate portion, and along the second direction, there is a second distance D ₂ mm between the first flat plate portion and the second flat plate portion adjacent to each other, satisfying: 0.01≤D ₁ /D ₂ ≤100.

Optionally, the first distance _D1 satisfies: _{0.3≤D1≤50} , and/or the second distance _D2 satisfies: _{0.3≤D2≤50} .

In a specific embodiment of the present application, the first flat plate portion, the second flat plate portion and the connecting portion are at least partially covered with an insulating layer.

Optionally, a dimension of the single battery along the first direction is H ₁ mm, satisfying: 0.03＜H ₂ /H ₁ ＜0.8.

Optionally, a distance H ₂ mm between the first side surface and the second side surface located on the same side of the heat management component along the first direction satisfies: 50 ≥ H ₂ ≥ 2.5.

Optionally, in at least some of the single cells, the facing area of two adjacent single cells along the second direction is S ₁ mm ² , and the area of one side of the single cell along the second direction is S ₂ mm ² , satisfying: 0.2＜S ₁ /S ₂ ＜1.

Optionally, along the first direction, a third accommodating space is defined between two adjacent connecting portions, and at least one of a heat insulating member, an insulating member and a buffer member is disposed in the third accommodating space.

Optionally, the single cell battery includes a first side wall and a second side wall arranged opposite to each other along a first direction, the surface areas of the first side wall and the second side wall are equal and are the side walls with the largest surface area of the single cell battery, the first side wall and the second side wall are respectively in contact with the adjacent first flat plate portion, or the first side wall and the second side wall are respectively in contact with the adjacent second flat plate portion.

Optionally, the first flat plate portion, the second flat plate portion and the connecting portion are an integrated structure.

Optionally, a medium flow channel is provided in the thermal management component, and the medium flow channel runs through the first flat plate portion, the second flat plate portion and the connecting portion along an extension direction of the thermal management component.

Optionally, the first flat plate portion and the second flat plate portion are arranged in parallel.

The present application also proposes a vehicle, comprising the battery pack as described above.

The battery pack and vehicle of the present application embodiment have the following advantages compared with the prior art:

In the battery pack of the present application, the first flat portion and the second flat portion of the thermal management component have a first distance in the first direction. Therefore, the first accommodating space limited by the first flat portion and the second accommodating space limited by the second flat portion are staggered in the second direction, and the single cells arranged in the first accommodating space and the single cells arranged in the second accommodating space are also staggered in the second direction. In this way, the area of the overlapping parts of the adjacent sides of two adjacent single cells will be smaller than the area of the side of a single single cell, that is, the facing area of adjacent single cells is reduced, which can increase the thermal resistance between the single cells and improve the safety of the battery pack.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a structural diagram of a battery pack according to an embodiment of the present application;

FIG2 is a structural diagram of a plurality of thermal management components and a plurality of single cells in cooperation with each other according to an embodiment of the present application;

FIG3 is a first angle structural diagram of a thermal management component according to an embodiment of the present application;

FIG4 is a position structure diagram of two adjacent thermal management components according to an embodiment of the present application;

FIG5 is a structural diagram of two adjacent thermal management components and a single battery in accordance with an embodiment of the present application;

FIG6 is a schematic diagram of the positions of two adjacent single cells when viewed from a second direction according to an embodiment of the present application;

FIG7 is a schematic diagram of a single cell when viewed from a second direction according to an embodiment of the present application;

FIG8 is a schematic diagram of the structure of the thermal management component according to an embodiment of the present application from a second angle;

FIG9 is a schematic diagram of the structure of the thermal management component according to the embodiment of the present application from a third angle;

FIG. 10 is a schematic structural diagram of a single cell from another angle according to an embodiment of the present application.

FIG. 11 is a schematic diagram of the structure of the thermal management component and the insulation layer in an embodiment of the present application.

In the figure, 1, box body; 10, single battery; 101, first side wall; 102, second side wall; 103, third side wall; 104, fourth side wall; 20, thermal management component; 201, side wall surface; 21, first flat plate portion; 211, first side surface; 22, second flat plate portion; 221, second side surface; 23, connecting portion; 24, medium flow channel; 100, first accommodating space; 200, second accommodating space; 300, third accommodating space; 400, filler; 500, insulating layer; X, first direction; Y, second direction.

DETAILED DESCRIPTION

The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", " The orientation or positional relationship indicated by "hour hand" and the like is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "plurality" refers to two or more, unless otherwise clearly and specifically defined.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distance, equal angle or equal area means the tolerance range is -1% to 1%.

The present application proposes a vehicle equipped with a battery pack for providing power to electrical devices on the vehicle.

As shown in FIGS. 1 to 11 , a battery pack according to a preferred embodiment of the present application comprises a box body 1, a single cell 10 and a thermal management component 20. Referring to FIGS. 1 to 4 , the box body 1 has a first direction X and a second direction Y intersecting each other. Preferably, the first direction X is perpendicular to the second direction Y. The single cell 10 and the thermal management component 20 are both multiple and arranged in the box body 1. The multiple thermal management components 20 are arranged in the box body 1 at intervals along the first direction X. The thermal management component 20 comprises a plurality of first flat plate portions 21, a plurality of second flat plate portions 22 and a plurality of connecting portions 23. At least part of the first flat plate portions 21 and the second flat plate portions 22 are alternately arranged along the second direction Y. There is a spacing H ₂ mm between the sidewall surfaces 201 of the adjacent first flat plate portions 21 and the second flat plate portions 22 on the same side along the first direction X, wherein H ₂ >0. The adjacent first flat plate portions 21 and the second flat plate portions 22 are connected by the connecting portions 23.

The first flat plate portions 21 of at least two adjacent heat management components 20 are arranged opposite to each other along the first direction X and define a first accommodation space 100. The second flat plate portions 22 of at least two adjacent heat management components 20 are arranged opposite to each other along the first direction X and define a second accommodation space 100. The accommodating space 200, at least part of the connecting portions 23 of two adjacent thermal management components 20 are arranged opposite to each other along the first direction X and define a third accommodating space 300. The first accommodating space 100 and the second accommodating space 200 are connected through the third accommodating space 300, and at least one single battery 10 is disposed in each of the first accommodating space 100 and the second accommodating space 200.

Based on the above structure, in the battery pack of this embodiment, since the first flat portion 21 and the second flat portion 22 have a spacing in the first direction X, the first accommodating space 100 and the second accommodating space 200 also have a certain distance on the same side in the second direction Y, so that the single battery 10 in the first accommodating space 100 and the single battery 10 in the second accommodating space 200 are staggered with each other. At this time, the area of the overlapping part of the projection of the two on the plane perpendicular to the second direction Y is smaller than the side area of one side of the single single battery 10 in the second direction Y, and the thermal resistance between two adjacent single batteries 10 in the battery pack 1 becomes smaller; in addition, the thermal resistance between two adjacent single batteries 10 A third accommodating space 300 is reserved so that there is a certain distance between two adjacent single cells 10, that is, the creepage distance and heat transfer distance between the adjacent single cells 10 are increased, and the third accommodating space 300 can be filled with insulating and heat-insulating materials to further improve the insulating and heat-insulating performance between the adjacent single cells 10. Since the area of the overlapping part of the projections of two adjacent single cells 10 is smaller than the side area of the single cell 10, it is only necessary to fill the positions corresponding to the overlapping parts of the adjacent single cells 10 with insulating and heat-insulating materials, thereby reducing the use of insulating and heat-insulating materials and reducing the cost of the battery pack, while also ensuring the insulation safety and thermal safety of the battery pack.

In this embodiment, the first flat plate portion 21 and the second flat plate portion 22 are parallel, that is, the distances between the side walls of the first flat plate portion 21 and the second flat plate portion 22 on the same side are substantially equal.

In this embodiment, the first flat plate portion 21, the connecting portion 23, and the second flat plate portion 22 have substantially the same thickness along the first direction X, and are sequentially connected to form a substantially zigzag structure, that is, groove structures are formed on both sides of the thermal management component 20 along the first direction X. At this time, the thermal management component 20 can be formed by welding a plurality of plates, or by bending a plate, or by extruding a profile and then stamping it.

In other embodiments, the first flat plate portion 21, the connecting portion 23 and the second flat plate portion 22 have different thicknesses along the first direction X and are connected in sequence, and in this case, the thermal management component 20 is formed with a groove structure only on one side along the first direction X. In this case, the thermal management component 20 can be formed by stamping a single plate.

In some embodiments, along the first direction X, a third accommodating space 300 is defined between two adjacent connecting portions 23, and a filler 400 is disposed in the third accommodating space 300, and the filler 400 includes at least one of a heat insulating member, an insulating member, and a buffer member; in order to make full use of the third accommodating space 300, the heat insulating performance or insulation performance between adjacent single cells 10 can be increased, thereby improving safety. Specifically, the insulating member made of insulating and heat insulating material can achieve insulation and heat insulation between two adjacent single cells 10, thereby preventing short circuit or heat spread between the two single cells 10, or the heat insulating member made of insulating material can be placed between adjacent single cells 10, thereby further The buffer made of elastic material can increase the limit between the two single cells 10 and provide a certain buffer space, or an insulating member and a heat insulating member are provided at the same time to achieve insulation and heat insulation between two adjacent single cells 10, which is not limited in this embodiment. Among them, the heat insulating material is such as plastic, aerogel, etc. The insulating and heat insulating material is such as insulating foam, rubber, ceramic, ceramic silicone rubber, etc.

In some embodiments, each of the first accommodating space 100 and the second accommodating space 200 is provided with a single battery 10 . In this case, at least one of an insulating member, a heat insulating member and a buffer member is provided between two adjacent single batteries 10 .

In other embodiments, the first accommodating space 100 and the second accommodating space 200 may be provided with different numbers of single cells 10, or both may be provided with two single cells 10, or multiple single cells 10. In this case, the single cell 10 in the first accommodating space 100 close to the second accommodating space 200 is referred to as the first single cell 10, and the single cell 10 in the second accommodating space 200 close to the first accommodating space 100 is referred to as the second single cell 10. At least one of an insulating member, a heat insulating member and a buffer is provided between the adjacent first single cells 10 and the second single cells 10. In addition, at least one of an insulating member, a heat insulating member and a buffer may also be provided between two adjacent single cells 10 in the first accommodating space 100, and at least one of an insulating member, a heat insulating member and a buffer is also provided between two adjacent single cells 10 in the second accommodating space 200.

In some embodiments, referring to FIG. 2 and FIG. 4 , a single first accommodating space 100 and a single second accommodating space 200 are both provided with a single single battery 10 as an example for description. The single battery 10 is provided between two adjacent connecting portions 23 of the thermal management component 20. Along the second direction Y, the projections of the single battery 10 and the connecting portion 23 at least partially overlap. More preferably, in this embodiment, both ends of the single battery 10 along the second direction Y are respectively in contact with the two adjacent connecting portions 23. Specifically, the first accommodating space 100 is defined by two first flat plate portions 21 arranged oppositely along the first direction X and two adjacent connecting portions 23 of one thermal management component 20. The second accommodating space 200 is defined by two second flat plate portions 22 arranged oppositely along the first direction X and two adjacent connecting portions 23 of another thermal management component 20. Based on this, the two adjacent connecting portions 23 of the thermal management component 20 can limit the single battery 10. In this way, the single battery 10 is limited by the first direction X and the second direction Y at the same time, which can improve the structural stability of the single battery 10 in the battery pack.

When at least two single cells 10 are provided in the first accommodation space 100, along the second direction Y, the first single cell 10 in the first accommodation space 100 contacts one of the two adjacent connecting portions 23 of the thermal management component 20, and the last single cell 10 contacts the other connecting portion 23, based on which the arrangement stability of all the single cells 10 in the first accommodation space 100 can be ensured. Similarly, when at least two single cells 10 are provided in the second accommodation space 200, the two adjacent connecting portions 23 of the thermal management component 20 also limit all the single cells 10 in the above manner.

In some embodiments, referring to FIG. 4 , along the first direction X, there is a first distance between the first flat plate portion 21 and the second flat plate portion 22. The first flat plate portion 21 and the second flat plate portion 22 adjacent to each other along the second direction Y have _{a second distance D 2 mm} , which satisfies: 0.01≤D ₁ /D ₂ ≤100. For example, D ₁ /D ₂ may be in the range of one or any two of 0.08, 1.5, 2.4, 3.2, 4.5, 5.8, 7.3, 8.2, 9.6, 15, 25, 47, 58, 77, 84, and 92. Wherein, D ₁ /D ₂ satisfies the relationship so that the first flat plate portion 21 and the second flat plate portion 22 of the thermal management component 20 have a suitable distance in the first direction X and the second direction Y. Such a thermal management component 20 is provided with corresponding avoidance positions on both sides along the first direction X, so that when a plurality of thermal management components 20 are arranged along the first direction X, the specifications of each first accommodation space 100 and the second accommodation space 200 are the same, and single cells 10 of the same specifications can be placed, thereby reducing the manufacturing cost of the battery pack 1. When the value of D ₁ /D ₂ increases, the distance between the first accommodating space 100 and the second accommodating space 200 decreases, and the structure of the battery pack 1 becomes more compact. However, at this time, the limiting effect of the first accommodating space 100 or the second accommodating space 200 on the single battery 10 will decrease, and the connection reliability of the single battery 10 will decrease. When the value of D ₁ /D ₂ decreases, the limiting effect of the first accommodating space 100 or the second accommodating space 200 on the single battery 10 will increase, and the connection reliability of the single battery 10 will increase. The distance between the first accommodating space 100 and the second accommodating space 200 increases, and the structure of the battery pack 1 becomes loose, and the space utilization rate decreases. Therefore, satisfying the above range can take into account both the connection reliability and the compactness of the structure of the battery pack 1.

In some other preferred embodiments, 1.9≤D ₁ /D ₂ ≤88, more preferably, 24≤D ₁ /D ₂ ≤57, so as to better control the manufacturing cost of the battery pack.

Further, the first distance _D1 satisfies: _{0.3≤D1≤50} , for example, _D1 can be a range consisting of one or any two of 0.35, 0.5, 0.54, 0.98, 1.6, 4.4, 6.2, 8.5, 14.4, 16.8, 25.6, 28.3, 32.4, 40.8, 43, 48.6. Based on this, the first flat plate portion 21 and the second flat plate portion 22 of the thermal management component 20 have a suitable distance to take into account the manufacturing cost and safety of the battery pack 1.

In some other preferred embodiments, the first distance _D1 satisfies: _3≤D1≤35 . More preferably, the first distance _D1 satisfies: _11≤D1≤21 , so that the distance between the first flat plate portion 21 and the second flat plate portion 22 is more appropriate.

In some embodiments, the second distance _D2 satisfies: _{0.3≤D2≤50} , and _D2 can be a range consisting of one or any two of 0.5, 2.6, 5.6, 8.8, 14.6, 18, 22, 25, 30, 34, 39, 45, so that the distance between the first flat portion 21 and the second flat portion 22 is appropriate, and the thermal resistance between adjacent single batteries 10 and the amount of insulating and heat-insulating materials are controlled to be within an appropriate range and the maintenance convenience of the battery pack 1, and the weight of the thermal management component 20 can be avoided to be too large, resulting in a decrease in the weight energy density of the battery pack 1.

In some embodiments, 0.3≤D ₁ ≤50 and 0.3≤D ₂ ≤50.

Specifically, the first distance _D1 is measured by taking the side surface of the first flat plate portion 21 close to the second flat plate portion 22 as the first measuring surface, and taking the side surface of the second flat plate portion 22 close to the first flat plate portion 21 as the second measuring surface, measuring the distance between the first measuring surface and the second measuring surface multiple times to obtain multiple first measurement values, and calculating the average value of the multiple first measurement values as the first distance _D1 .

The second distance _D2 is measured by taking the first side surface 211 and the second side surface 221 of the thermal management component 20 on the same side of the first direction X as measurement references, first obtaining a first edge line of the first side surface 211 with a sudden change in curvature on a side close to the second side surface 221, that is, a bending line where the bend occurs, and then obtaining a second edge line of the second side surface 221 with a sudden change in curvature on a side close to the first side surface 211, that is, a bending line where the bend occurs, measuring the distance between the first edge line and the second edge line in the second direction Y for multiple times to obtain multiple second measurement values, and calculating the average value of the multiple second measurement values as the second distance _D2 .

In some embodiments, referring to Figures 4 and 5, the size of the single battery 10 along the first direction X is H ₁ mm; the first flat portion 21 includes two first side surfaces 211 arranged in back to back relation along the first direction X, the second flat portion 22 includes two second side surfaces 221 arranged in back to back relation along the first direction X, and the spacing between the first side surface 211 and the second side surface 221 of the thermal management component 20 on the same side of the first direction X is H ₂ mm, satisfying: 0.03<H ₂ /H ₁ <0.8, for example, H ₂ /H ₁ can be a range consisting of one or any two of 0.035, 0.06, 0.15, 0.18, 0.24, 0.27, 0.36, 0.38, 0.43, 0.50, 0.56, 0.63, and 0.78. Among them, _H1 and _H2 satisfying the relationship can make the connecting portion 23 have a suitable length in the first direction X, thereby stably limiting the single battery 10, preventing the single battery 10 from sliding relative to the connecting portion 23 when subjected to a force in the second direction Y, thereby avoiding squeezing between adjacent single batteries 10, and a connecting portion 23 with a suitable length can control the facing area between two single batteries 10 adjacent to the connecting portion 23, so as to control the amount of insulating and heat-insulating materials. In addition, since _H2 is affected by the size of the thermal management component 20 along the first direction X, controlling the ratio of _H2 to _H1 can avoid the problem of excessive overall weight of the thermal management component 20 caused by the excessive length of the connecting portion 23, thereby avoiding affecting the manufacturing cost and weight energy density of the battery pack.

In other preferred embodiments, the battery pack satisfies: 0.1<H ₂ /H ₁ <0.55, more preferably, satisfies: 0.2<H ₂ /H ₁ <0.4, along the first direction X, so that the length of the connecting portion 23 changes more reasonably with the size of the single battery 10, and the connection reliability and cost control of the single battery 10 can be taken into account.

Specifically, the single cell 10 in the present embodiment is square, so its dimension along the first direction X is H ₁ mm. In the present embodiment, the dimension of the single cell 10 along the first direction X is the distance between two relative side walls along the first direction X, which can be obtained by a conventional testing method, that is, the two side walls of the single cell 10 along the first direction X can be clamped by a vernier caliper to measure and obtain a plurality of third measurement values, and the average value of the plurality of third measurement values can be calculated to obtain H ₁ .

In this embodiment, two opposite side walls of the single battery 10 along the first direction X are in contact with adjacent heat management components 20 respectively.

The distance _H2 is measured by taking the first side surface 211 and the second side surface 221 of the thermal management component 20 on the same side along the first direction X as the measuring surface, measuring the distance between the first side surface 211 and the second side surface 221 as the measuring surface for multiple times to obtain multiple fourth measurement values, and calculating the average value of the multiple fourth measurement values as the distance _H2 .

Further, the spacing _H2 between the first side surface 211 and the second side surface 221 on the same side of the thermal management component 20 along the first direction X satisfies: 50 ≥ _H2 ≥ 2.5, for example, _H2 may be one of 3.4, 5.6, 10.8, 17, 23.2, 31.6, 35.6, 42, and 47.9. _H2 satisfies this relationship to adapt to the size setting of the single battery 10.

In other embodiments, 33≥H ₂ ≥7, more preferably, 24≥H ₂ ≥11, so as to better adapt to the size of the single battery 10 .

In some embodiments, referring to FIG. 6 , FIG. 6 is a schematic diagram of the positions of two adjacent single cells 10 when observed from the second direction Y. In at least some of the single cells 10 , the facing area of two adjacent single cells 10 along the second direction Y is S ₁ mm ² . As shown in FIG. 6 , the facing area S1 is the portion indicated by the dotted box. Referring to FIG. 7 , FIG. 7 is a schematic diagram of the single cell 10 when observed from the second direction Y. The side area of one side of the single cell 10 along the second direction Y is S ₂ mm ² , satisfying: 0.2＜S ₁ /S ₂ ＜1. Specifically, taking a single first accommodating space 100 and a single second accommodating space 200 each containing a single battery 10 as an example, the facing area of two adjacent single batteries 10 along the second direction Y is S ₁ mm ² , which refers to the facing area between the single battery 10 in the first accommodating space 100 and the single battery 10 in the second accommodating space 200 , wherein S ₁ /S ₂ can be one of 0.31, 0.48, 0.53, 0.58, 0.64, 0.66, 0.72, 0.78, 0.82, 0.92, 0.99, 0.995 or a range consisting of any two of them. When S ₁ and S ₂ satisfy the relationship, a suitable facing area can be provided between the two single cells 10. When the proportion of the facing area S ₁ decreases, the amount of insulating and heat-insulating materials used will decrease, and the manufacturing cost of the battery pack 1 will decrease. At this time, the thermal resistance between adjacent single cells 10 will increase, the thermal diffusion risk of the battery pack will decrease, and the thermal safety performance of the battery pack will be guaranteed. However, at this time, the space between adjacent single cells 10 will decrease, leaving less space for the disassembly tool to break through, and the detachability of the battery pack 1 will decrease, which will lead to a decrease in the subsequent maintenance convenience. When the proportion of the facing area S ₁ increases, the space between adjacent single cells 10 will increase, the detachability of the battery pack 1 will increase, and the subsequent maintenance convenience will increase, that is, the maintenance cost will decrease. However, at this time, the amount of insulating and heat-insulating materials used will increase, the manufacturing cost will increase, the thermal resistance between adjacent single cells 10 will decrease, the thermal diffusion risk of the battery pack 1 will increase, and the thermal safety of the battery pack 1 will decrease. When the proportion of the facing area is within the above range, the thermal safety, manufacturing cost and maintenance convenience of the battery pack can be well balanced. Specifically, the facing area refers to the area of the portion of two adjacent single cells 10 where the projection of one single cell 10 on the other single cell 10 covers the other single cell 10 .

In some other preferred embodiments, 0.45≤S ₁ /S ₂ ≤0.65, so that two adjacent single batteries 10 have a more appropriate facing area.

In some embodiments, 20＜S ₁ ＜10000, preferably, 600＜S ₁ ＜6000; 100＜S ₂ ＜10000, preferably, 800＜S ₂ ＜6000.

Specifically, in this embodiment, the single battery 10 is a square, so the projection area of the single battery 10 along the second direction Y is S ₂ mm ² , which can be obtained by conventional measurement methods, that is, measuring the side length of the square multiple times, calculating multiple area measurement values, and then calculating The value of _S2 is obtained by averaging multiple area measurements.

The area of two adjacent single cells 10 facing each other along the second direction Y is S ₁ mm ² , and the measurement method is as follows: a boundary line is drawn on the adjacent side walls of two adjacent single cells 10 by a right-angle tool to form a closed figure, and the side length of the closed figure is measured by a ruler or other length measuring tool, and the area measurement value is obtained by calculating the side length, and the process is repeated multiple times to obtain multiple area measurement values, and the average value of the area measurement values is calculated to obtain S ₂ .

In some embodiments, as shown in FIG. 11 , the first flat portion 21 , the second flat portion 22 and the connecting portion 23 are at least partially covered with an insulating layer 500 to achieve insulation between the single battery 10 and the thermal management component 20 , wherein the insulating layer 500 can be formed by sticking an insulating film or spraying insulating powder.

In some embodiments, as shown in FIG. 10 , the single cell 10 includes a first side wall 101 and a second side wall 102 that are arranged opposite to each other along a first direction X. Preferably, the surface areas of the first side wall 101 and the second side wall 102 are equal, and the first side wall 101 and the second side wall 102 are the side walls with the largest surface areas of the single cell 10. The first side wall 101 of the single cell 10 is in contact with the adjacent thermal management component 20, that is, the first side wall 101 is in contact with the first flat plate portion 21 or the second flat plate portion 22. Since the first side wall 101 and the second side wall 102 are both the side walls with the largest surface areas of the single cell 10, the bonding area between the single cell 10 and the thermal management component 20 is also the largest. Based on this, the thermal management efficiency of the single cell 10 can be improved. Among them, the first side wall 101 is in contact with the first flat plate portion 21 or the second flat plate portion 22, which may be direct contact or contact through an intermediate medium. In practical applications, at least one of an insulating layer or an adhesive layer may be provided between the first side wall 101 of the single cell 10 and the thermal management component 20, and at least one of an insulating layer or an adhesive layer may be provided between the second side wall 102 of the single cell 10 and the thermal management component 20.

Specifically, as shown in FIG10 , the single cell 10 further includes a third side wall 103 and a fourth side wall 104 that are arranged opposite to each other along the second direction Y. The third side wall 103 and the fourth side wall 104 are both perpendicular to the first side wall 101 and the second side wall 102, and the surface areas of the third side wall 103 and the fourth side wall 104 are equal and smaller than the surface areas of the first side wall 101 and the second side wall 102. In other embodiments, two adjacent thermal management components 20 are in contact with the third side wall 103 and the fourth side wall 104 of the single cell 10, respectively, which can also achieve thermal management of the single cell 10.

In some embodiments, the first flat plate portion 21, the second flat plate portion 22 and the connecting portion 23 are an integral structure, such as an integral structure made by injection molding, or an integral structure formed by stamping and bending a profile, or a structure formed by welding a stamped plate.

In some embodiments, referring to Figure 8, the connecting portion 23 is a flat plate structure, and the angle between the connecting portion 23 and the first flat plate portion 21 is α, satisfying: 75°≤α≤179°; for example, α is in the range of one or any two of 80°, 90°, 96°, 112°, 120°, 138°, 145°, and 164°. α satisfies this relationship so that there is a suitable angle between the connecting portion 23 and the first flat plate portion 21 to ensure that the first flat plate portion 21 and the second flat plate portion 22 have a suitable spacing in the second direction Y.

In some embodiments, the connection between the connection portion 23 and the first flat plate portion 21 and the second flat plate portion 22 is transitioned by a rounded structure. The connection portion 23 of the flat plate structure includes two first planes arranged opposite to each other, and a single first plane and a single first side surface 211 are located on the same side of the thermal management component 20, and the angle between the two is the above-mentioned angle α. The angle between the two planes can be measured by conventional measurement methods, and this embodiment will not be described in detail.

In other embodiments, the connecting portion 23 may also be an arc-shaped plate structure or other plate-shaped structures, which is not limited in this embodiment.

In some embodiments, referring to FIG9 , a medium flow channel 24 is provided in the thermal management component 20, and the medium flow channel 24 penetrates the first flat portion 21, the connecting portion 23, and the second flat portion 22 along the extension direction of the thermal management component 20. Specifically, the medium flow channel 24 penetrates the first flat portion 21, the connecting portion 23, and the second flat portion 22 in sequence along the connection direction of the first flat portion 21, the connecting portion 23, and the second flat portion 22. As a specific implementation of the medium flow channel 24, the thermal management component 20 is a tubular structure with equal wall thickness everywhere, and the pipeline formed is the medium flow channel 24. The thermal management component 20 of this structure has a large space for the medium flow channel 24, which is conducive to improving the thermal management efficiency. Of course, this embodiment does not exclude the situation where the distance between the inner wall of the medium flow channel 24 and the outer wall of the thermal management component 20 is not equal everywhere.

In this embodiment, the medium flow channel 24 runs through all the first flat plate portions 21, the second flat plate portions 22 and the connecting portions 23 in the thermal management component 20, that is, the thermal management component 20 is provided with a medium inlet and a medium outlet at both ends along the length direction, thereby improving the heat exchange efficiency of the thermal management component 20 and improving the safety of the battery pack.

In other embodiments, at least two adjacent thermal management components 20 are connected to each other so that the medium flow channels 24 in the thermal management components 20 are interconnected, thereby reducing the number of inlets and outlets of the medium flow channels 24 in the battery pack 1 .

Specifically, the thermal management of the single cell 10 can be to dissipate heat from the single cell 10 or to heat the single cell 10. In practical applications, when the single cell 10 needs to dissipate heat, a liquid such as a coolant is introduced into the medium flow channel 24, and the heat generated by the single cell 10 is taken away by the flowing coolant. When the single cell 10 needs to be heated, hot steam or hot water is introduced into the medium flow channel 24, and the hot steam or hot water transfers heat to the single cell 10. In other embodiments, a heating plate may also be provided on the first flat plate portion 21 and the second flat plate portion 22 of the thermal management component 20, and the single cell 10 is heated by the heating plate.

The following are the relevant test methods:

Provide a test method for thermal resistance of fillers:

(1) Scrape off the filler 400 between adjacent single batteries 10 completely;

(2) The thickness of the filler 400 is measured multiple times and the average value is taken to obtain the thickness of the filler 400 L mm; or, when the filler 400 almost fills the gap between adjacent single cells 10, for the convenience of measurement, the gap between adjacent single cells 10 is approximately equal to the thickness of the filler 400, the gap between the single cells 10 is measured multiple times and the average value is taken to obtain D ₂ mm, the thickness of the filler 400 Degree L = D ₂ ;

(3) Measure and calculate the heat transfer area of adjacent single cells 10 multiple times and take the average value to obtain S ₁ mm ² ;

(4) According to the formula: R=L/(ρS ₁ )×10 ³ , the thermal resistance R between adjacent single batteries 10 is calculated, where R is the thermal resistance, in units of K/W; ρ is the thermal conductivity, in units of W (m*K).

Provide a weighing method for 400 weight of filler:

(1) Prepare a container, weigh the container three times using an electronic scale, and take the average value to obtain the container weight M ₁ g;

(2) Disassemble the battery pack 1, scrape off the filler 400 between adjacent single batteries 10, and place them in a container;

(3) Weigh the total weight of the container containing 400 g of filler three times and take the average value to obtain M ₂ g;

(4) Filler 400 weight = M ₂ - M ₁ .

Provide a method for measuring the maintenance space of a battery pack:

(1) The outer envelope of the battery pack 1 is removed so that the thermal management component 20 and the single batteries 10 located in the first accommodation space 100 and the second accommodation space 200 can be directly observed;

(2) Using a vernier caliper, measure the minimum length, minimum width, and minimum height of the single battery 10 in the first accommodation space 100, the single battery 10 in the second accommodation space 200, and the third accommodation space 300 surrounded by the thermal management component 20 for multiple times, and take their respective average values;

(3) Calculate the volume V ₁ mm ³ of the third accommodating space 300 using the values in step (2);

(4) Maintenance space = volume V ₁ .

Examples 1 to 16

A battery pack is provided, comprising: a box body 1 having a first direction X and a second direction Y orthogonal to each other; a plurality of single cells 10 arranged in the box body 1; a plurality of thermal management components 20 arranged in the box body 1 at intervals along the first direction X, the thermal management components 20 comprising: a plurality of first flat portions 21 and a plurality of second flat portions 22, the first flat portions 21 and the second flat portions 22 being alternately arranged along the second direction Y; along the first direction X, a spacing H ₂ mm is provided between the side walls on the same side of at least one group of the first flat portions 21 and the second flat portions 22, and adjacent first flat portions 21 and second flat portions 22 are connected by a connecting portion 23; the first flat portions 21 of two adjacent thermal management components 20 are arranged opposite to each other along the first direction X and define a first accommodation space 100, the second flat portions 22 of two adjacent thermal management components 20 are arranged opposite to each other along the first direction X and define a second accommodation space 200, the first accommodation space 100 is connected to the second accommodation space 200, and a single cell 10 is provided in each of the first accommodation space 100 and the second accommodation space 200.

Along the first direction X, a third accommodating space 300 is defined between two adjacent connecting portions 23. A filler 400 is disposed in the third accommodating space 300. The filler 400 is ceramic silicone rubber, which has insulation and heat insulation properties. The thermal conductivity of the ceramic silicone rubber is 0.35. W/(m*K), density is 1.5g/cm ³ .

The size of the single battery 10 along the first direction X is H ₁ mm, the ratio of the facing area of two adjacent single batteries 10 along the second direction Y to the area of one side of the single battery 10 along the second direction Y is S ₁ /S ₂ , and the first flat portion 21 and the second flat portion 22 adjacent along the second direction Y have a second distance D ₂ mm.

Using the above test method, examples 1 to 16 were tested, and the results are shown in the following table:

Referring to Examples 1 to 5, it can be obtained that the specifications of the single battery 10 remain unchanged and H ₂ is increased. In this case, H ₂ /H ₁ will increase, the proportion of the facing area, that is, S ₁ /S _2, will decrease in the same proportion, the thermal resistance will increase, and the weight of the filler 400 will decrease, that is, the thermal safety can be improved and the manufacturing cost can be reduced, but the maintenance space will be reduced. However, the changes in the three are not significant.

Referring to Examples 2, 6-7, 10, and 11, it can be seen that increasing D ₂ will not change the facing area. In this case, the thermal resistance will increase, and the maintenance space will also increase, indicating that the thermal safety and maintenance convenience of the battery pack are improved. However, the weight of the filler 400 will also increase, but the changes in the three are not significant.

Referring to Examples 2, 8, and 9, it can be obtained that when H ₁ is increased, the thickness of the single battery 10 changes, H ₂ /H ₁ will decrease, the proportion of the facing area will increase accordingly, and the maintenance space will also increase, that is, the maintenance cost will decrease, but the thermal resistance will decrease accordingly, and the weight of the filler 400 will increase accordingly, that is, the thermal safety of the battery pack 1 will decrease, and the manufacturing cost will increase. However, at this time, the changes in the three are not significant.

Referring to Examples 12 to 15, it can be obtained that when the value of S ₁ /S ₂ is less than the lower limit of the preferred value, the thermal resistance will be greatly increased, the weight of the filler 400 will be greatly reduced, the thermal safety of the battery pack 1 will be improved, and the manufacturing cost will be reduced, but the maintenance space will be greatly reduced, the maintenance convenience will be reduced, and the subsequent maintenance cost will be greatly increased; it is worth noting that in Example 4, the proportion of the facing area is 0, that is, the adjacent single batteries 10 are completely staggered.

Referring to Example 16, it can be obtained that when the value of S ₁ /S ₂ is greater than the upper limit of the preferred value, for example, S ₁ /S ₂ =1, that is, when two adjacent single cells 10 are completely opposite, the thermal resistance will be lower and the maintenance space will be larger, but at this time the weight of the filler 400 will increase significantly, that is, the manufacturing cost will increase significantly.

The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims (18)

1. A battery pack, comprising:

   A box (1) having a first direction (X) and a second direction (Y) intersecting each other;

   A plurality of single cells (10) are arranged in the box (1);

   A plurality of heat management components (20) are arranged in the box body (1) at intervals along the first direction (X), the heat management components (20) comprising: a plurality of first flat plate portions (21), a plurality of second flat plate portions (22) and a plurality of connecting portions (23), at least some of the first flat plate portions (21) and the second flat plate portions (22) are arranged alternately along the second direction (Y), and adjacent first flat plate portions (21) and second flat plate portions (22) have a spacing between side wall surfaces (201) on the same side in the first direction (X), and the connecting portion (23) is arranged between the first flat plate portion (21) and the second flat plate portion (22);

   The first flat plate portions (21) of at least two adjacent thermal management components (20) are arranged relative to each other along a first direction (X) and define a first accommodating space (100); the second flat plate portions (22) of at least two adjacent thermal management components (20) are arranged relative to each other along the first direction (X) and define a second accommodating space (200); the first accommodating space (100) is connected to the second accommodating space (200); and at least one single battery (10) is arranged in each of the first accommodating space (100) and the second accommodating space (200).
2. The battery pack according to claim 1, wherein the single battery (10) is arranged between two adjacent connecting portions (23) of the thermal management component (20), and the single battery (10) has a third side wall (103) and a fourth side wall (104) arranged opposite to each other along the second direction (Y), and along the second direction (Y), a projection of the connecting portion (23) on the plane where the third side wall (103) is located at least partially covers the third side wall (103).
3. The battery pack according to claim 1, wherein the single battery (10) is arranged between two adjacent connecting portions (23) of the thermal management component (20), and the single battery (10) has a third side wall (103) and a fourth side wall (104) arranged opposite to each other along the second direction (Y), and along the second direction (Y), a projection of the connecting portion (23) on the plane where the fourth side wall (104) is located at least partially covers the fourth side wall (104).
4. The battery pack according to claim 1, wherein, along the first direction (X), there is a first distance _D1 mm between the first flat portion (21) and the second flat portion (22), and along the second direction (Y), there is a second distance _D2 mm between the first flat portion (21) and the second flat portion (22) adjacent to each other, satisfying: _0.01≤D1 / _D2≤100 .
5. The battery pack according to claim 4, wherein the first distance _D1 satisfies: _{0.3≤D1≤50} .
6. The battery pack according to claim 4, wherein the second distance _D2 satisfies: _{0.3≤D2≤50} .
7. The battery pack according to claim 1, wherein the first flat plate portion (21), the second flat plate portion (22) and The connecting parts (23) are at least partially covered with an insulating layer (500).
8. The battery pack according to claim 1, wherein the spacing is H ₂ mm, the size of the single battery (10) along the first direction (X) is H ₁ mm, and the relationship: 0.03＜H ₂ /H ₁ ＜0.8 is satisfied.
9. The battery pack according to claim 8, wherein the size of the single battery (10) along the first direction (X) is H ₁ mm, satisfying: 0.1＜H ₂ /H ₁ ＜0.6.
10. The battery pack according to claim 1, wherein the spacing is H ₂ mm, and the battery pack satisfies: 50 ≥ _{H 2} ≥ 2.5.
11. The battery pack according to claim 1, wherein, in at least some of the single cells (10), the facing area of two adjacent single cells (10) along the second direction (Y) is _S1 ^mm2 , and the area of one side of the single cell (10) along the second direction (Y) is _S2 ^mm2 , satisfying: 0.2＜ _S1 / _S2 ＜1.
12. The battery pack according to claim 1, wherein, along the first direction (X), a third accommodating space (300) is defined between two adjacent connecting portions (23), and a filler (400) is provided in the third accommodating space (300), and the filler (400) includes at least one of a heat insulating member, an insulating member, and a buffer member.
13. The battery pack according to claim 1, wherein the single battery (10) comprises a first side wall (101) and a second side wall (102) arranged opposite to each other along a first direction (X), the first side wall (101) and the second side wall (102) having the same surface area and being the side wall with the largest surface area of the single battery (10), and the first side wall (101) and the second side wall (102) respectively contact the adjacent first flat plate portion (21).
14. The battery pack according to claim 1, wherein the single battery (10) comprises a first side wall (101) and a second side wall (102) arranged opposite to each other along a first direction (X), the first side wall (101) and the second side wall (102) having the same surface area and being the side wall with the largest surface area of the single battery (10), and the first side wall (101) and the second side wall (102) respectively contact the adjacent second flat plate portion (22).
15. The battery pack according to claim 1, wherein the first flat portion (21), the second flat portion (22) and the connecting portion (23) are an integrated structure.
16. The battery pack according to claim 1, wherein a medium flow channel (24) is provided in the thermal management component (20), and the medium flow channel (24) passes through the first flat plate portion (21), the connecting portion (23) and the second flat plate portion (22) along an extension direction of the thermal management component (20).
17. The battery pack according to claim 1, wherein the first flat plate portion (21) and the second flat plate portion (22) are arranged in parallel.
18. A vehicle, comprising the battery pack according to any one of claims 1 to 17.