CN218731578U - Battery pack - Google Patents

Abstract

The utility model relates to a battery technology field provides a battery pack, include: the battery unit comprises a plurality of single batteries, and the stacking direction of the single batteries is perpendicular to the large surfaces of the single batteries; separate the unit, separate the unit setting between two adjacent battery cells, the relative both sides of separating the unit include heat-transfer face and heat insulating surface, heat-transfer face and heat insulating surface contact with two adjacent battery cells's big surface respectively, so that separate the big surface heat transfer contact of unit and a battery cell, with the big surface thermal-insulated contact of another battery cell, on the basis of realizing a battery cell reliable heat transfer, can avoid again that a large amount of heat transfer appears in the heat between two adjacent battery cells, can avoid a certain battery cell to appear the back of thermal runaway from this, thermal runaway also can appear in another battery cell, can improve the security performance of group battery from this.

Description

Battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery pack.

Background

In the related art, the battery pack may include a plurality of batteries, and a large amount of heat may be generated during the charge and discharge of the battery pack, thereby requiring the battery pack to be cooled in time, but in some cases, it is easy to cause a battery safety problem.

SUMMERY OF THE UTILITY MODEL

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

The utility model provides a battery pack, include:

the battery unit comprises a plurality of single batteries, and the stacking direction of the single batteries is perpendicular to the large surfaces of the single batteries;

the separation unit is arranged between the two adjacent single batteries, the two opposite sides of the separation unit comprise a heat exchange surface and a heat insulation surface, and the heat exchange surface and the heat insulation surface are respectively contacted with the large surfaces of the two adjacent single batteries, so that the separation unit is in heat exchange contact with the large surface of one single battery and is in heat insulation contact with the large surface of the other single battery.

The utility model discloses group battery includes battery unit and separation unit, and battery unit includes a plurality of battery cells, a plurality of battery cell's the big surface of direction of piling up perpendicular to battery cell to can improve battery cell's the ability of piling up. And separate the unit setting between two adjacent battery cells, include heat-transfer surface and heat insulating surface through making the relative both sides of separating the unit, heat-transfer surface and heat insulating surface contact with two adjacent battery cells's big surface respectively, thereby can make the big surface heat transfer contact of separating unit and a battery cell, with the big surface heat insulation contact of another battery cell, on the basis of realizing a battery cell reliable heat transfer, can avoid again leading to a large amount of heat transfer to appear through the heat transfer contact between two adjacent battery cells, because the heat transfer area on battery big surface is the biggest and heat transfer rate is very fast, can avoid a certain battery cell to appear the back of thermal runaway from this, another battery cell also can appear the thermal runaway, can improve the security performance of group battery from this.

Drawings

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

Wherein:

fig. 1 is a partial structural schematic view of a battery pack according to an exemplary embodiment;

fig. 2 is a schematic structural view illustrating a battery pack according to another exemplary embodiment;

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

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

fig. 5 is a schematic view illustrating a structure of a first viewing angle of a partition unit of a battery pack according to a first exemplary embodiment;

fig. 6 is a structural view illustrating a second perspective view of a partition unit of a battery pack according to the first exemplary embodiment;

fig. 7 is a structural schematic diagram illustrating a third perspective view of a partition unit of a battery pack according to the first exemplary embodiment;

fig. 8 is a schematic structural view illustrating a unit cell of a battery pack according to an exemplary embodiment;

FIG. 9 is a schematic diagram illustrating a mating structure of a partition unit and a metal member of a battery pack according to an exemplary embodiment;

fig. 10 is a schematic structural view illustrating a partition unit of a battery pack according to a second exemplary embodiment;

fig. 11 is a schematic structural view illustrating a partition unit of a battery pack according to a third exemplary embodiment.

The reference numerals are explained below:

10. a battery cell; 11. a single battery; 111. a large surface; 20. a partition unit; 21. a heat exchange surface; 22. a heat insulation surface; 23. a heat conducting element; 231. a channel; 24. an insulating element; 25. a first channel layer; 26. a second channel layer; 27. a buffer section; 30. a battery case; 40. a heat exchange line; 50. a metal member; 51. a cavity.

Detailed Description

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

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

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

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

An embodiment of the present invention provides a battery pack, please refer to fig. 1 to 8, the battery pack includes: a battery unit 10, the battery unit 10 including a plurality of unit batteries 11, a stacking direction of the plurality of unit batteries 11 being perpendicular to a large surface 111 of the unit batteries 11; and the separation unit 20, the separation unit 20 is arranged between two adjacent single batteries 11, two opposite sides of the separation unit 20 comprise a heat exchange surface 21 and a heat insulation surface 22, and the heat exchange surface 21 and the heat insulation surface 22 are respectively in contact with the large surfaces 111 of two adjacent single batteries 11, so that the separation unit 20 is in heat exchange contact with the large surface 111 of one single battery 11 and in heat insulation contact with the large surface 111 of the other single battery 11.

The utility model discloses a group battery of an embodiment includes battery unit 10 and separates unit 20, and battery unit 10 includes a plurality of battery cells 11, a plurality of battery cells 11 pile up the big surface 111 of direction perpendicular to battery cell 11 to can improve battery cell 11's the ability of piling up. And separate unit 20 and set up between two adjacent battery cells 11, through making the relative both sides of separating unit 20 include heat-transfer surface 21 and heat insulating surface 22, heat-transfer surface 21 and heat insulating surface 22 contact with the big surface 111 of two adjacent battery cells 11 respectively, thereby can make separate unit 20 and the big surface 111 heat exchange contact of a battery cell 11, with the big surface 111 heat insulation contact of another battery cell 11, make the heat transfer rate of group battery obtain promoting, realize the rapid heating up or the cooling of group battery, improve the whole security performance of group battery and guarantee that the whole uniformity of group battery is better, promote the life-span of battery, can avoid again that the heat between two adjacent battery cells 11 to appear a large amount of heat transfer, can avoid certain battery cell 11 to appear after the thermal runaway from this, another battery cell 11 also can appear the thermal runaway, can improve the security performance of group battery from this.

It should be noted that the large surface 111 of the single battery 11 may be considered as a surface generating the most heat, and further, the large surface 111 of the single battery 11 may be a surface having the largest area of the single battery 11, for example, when the single battery 11 is a square battery, the surface having the largest area of the square battery may be the large surface 111 of the single battery 11, and the large surfaces 111 of the single batteries 11 may be two, and when the single battery 11 is a square battery, the heat exchange surface 21 of the partition unit 20 is in contact with the large surface 111 of one single battery 11, so that the partition unit 20 can perform rapid cooling on the single battery 11, thereby preventing the thermal runaway problem of the single battery 11, and the heat insulation surface 22 of the partition unit 20 is in contact with the large surface 111 of another single battery 11, thereby preventing the heat of one single battery 11 from being transferred to another single battery 11, thereby preventing a large amount of heat transfer between the single batteries 11, and further preventing a large amount of heat accumulation on one single battery 11 from causing the thermal runaway problem, thereby improving the safety performance of the battery.

The large surface 111 of the unit cell 11 is in contact with the heat exchange surface 21 of the partition unit 20, so that the heat exchange rate of the unit cell 11 can be significantly increased. In the related art, when thermal runaway occurs in the single battery 11, the cooling rate of the heat exchange structure to the single battery is less than the heat transfer rate of the heat exchange structure, and therefore, thermal runaway of adjacent single batteries is easily caused. In the present embodiment, the thermal insulation surface 22 of the partition unit 20 is in contact with another unit cell 11, so that the heat of the unit cell 11 in which thermal runaway occurs can be prevented from being transferred to another unit cell 11, and the linked thermal runaway phenomenon can be effectively prevented.

The heat exchange surface 21 is in contact with the large surface 111 of the single battery 11, that is, the heat exchange surface 21 may be in direct contact with the large surface 111 of the single battery 11, or the heat exchange surface 21 may be in indirect contact with the large surface 111 of the single battery 11, and the heat exchange surface 21 may be in indirect contact with the large surface 111 of the single battery 11 through other structures, for example, the heat exchange surface 21 may be in contact with the large surface 111 of the single battery 11 through structures such as an insulating member, an adhesive glue, or a buffer member.

Accordingly, the thermal insulation surface 22 is in contact with the large surface 111 of the single battery 11, that is, the thermal insulation surface 22 may be in direct contact with the large surface 111 of the single battery 11, or the thermal insulation surface 22 may be in indirect contact with the large surface 111 of the single battery 11, and the thermal insulation surface 22 may be in indirect contact with the large surface 111 of the single battery 11 through other structures, for example, the thermal insulation surface 22 may be in contact with the large surface 111 of the single battery 11 through an insulating member, an adhesive, a buffer member, or the like.

In one embodiment, as shown in fig. 5 to 7, the partition unit 20 includes: a heat conducting element 23, the heat conducting element 23 having a heat exchanging surface 21; the heat insulation element 24, the heat insulation element 24 has the heat insulation surface 22, so that the separation unit 20 can realize reliable heat exchange to the corresponding single battery 11 through the heat conduction element 23, and the separation unit 20 realizes heat insulation between two adjacent single batteries 11 through the heat insulation element 24, thereby improving the safety use performance of the batteries.

In one embodiment, the heat conducting element 23 is connected to the heat insulating element 24, thereby improving the stability of the partition unit 20, and avoiding the instability between the heat conducting element 23 and the heat insulating element 24, and thus the connection failure of the heat conducting element 23 or the heat insulating element 24, thereby securing the safety of the battery pack.

It should be noted that the heat conducting element 23 and the heat insulating element 24 may be directly connected, for example, the heat conducting element 23 and the heat insulating element 24 may be bonded; alternatively, the heat conducting element 23 and the heat insulating element 24 may be indirectly connected, for example, other structures may be disposed between the heat conducting element 23 and the heat insulating element 24, for example, a buffer structure may be disposed between the heat conducting element 23 and the heat insulating element 24, and both the heat conducting element 23 and the heat insulating element 24 are bonded to the buffer structure. Alternatively, the heat conducting element 23 and the heat insulating element 24 may be reliably connected by the pressing force between the adjacent two unit batteries 11, for example, at least one of the heat conducting element 23 and the heat insulating element 24 may be an elastic member, whereby it is possible to ensure that the heat conducting element 23 and the heat insulating element 24 are reliably connected by the pressing force.

In one embodiment, the heat conducting element 23 may be a metal plate, as shown in fig. 3 and 5, a channel 231 may be formed inside the metal plate, the channel 231 may be a heat exchanging channel, a gas or a liquid may flow inside the channel 231, or a phase change material may be disposed inside the channel 231.

As shown in fig. 1, the battery pack may introduce gas or liquid into the channel 231 through the heat exchange pipeline 40, so as to realize circulation of the gas or liquid, and the specific structure of the heat exchange pipeline 40 and the channel 231 is not limited herein.

The heat conducting element 23 may also be a heat conducting pad, for example, the heat conducting element may be a graphene sheet, a heat conducting silicone sheet, a heat conducting insulating elastic rubber sheet, or the like.

The insulating element 24 may be an aerogel blanket, a foam, a fiberglass piece, an asbestos piece, a ceramic paper piece, or the like. Alternatively, the insulating element 24 may be a thermal barrier coating, for example, a thermal barrier coating directly applied to the surface of the heat conducting element 23, a ceramic coating applied to the surface of the heat conducting element 23, or a metal member having a thermal barrier coating applied to the surface thereof, which may also be included in the insulating element 24.

In one embodiment, the heat conducting element 23 is a heating film, for example, the heating film may be a graphene heating film, a PET heating film, or a PI heating film, which is not only simple in structure, but also can ensure good heating performance, and the battery pack may use the heating film to rapidly heat the single battery 11 in the early stage, or may use the heating film to heat the single battery 11 when the ambient temperature is low.

In one embodiment, the heat conducting element 23 may include a metal plate and a heating film, so as to improve the heat exchange capability of the battery pack, for example, the metal plate is provided with a channel 231 inside, the channel 231 may be a cooling channel, cooling may be performed through the metal plate after the battery is used for a long time, and the heating film may be heated according to the use requirement of the battery pack, so as to meet the use requirement of the battery pack.

In one embodiment, the battery pack further includes a metal member 50, and the metal member 50 is disposed on a side of the heat insulation element 24 facing away from the heat conduction element 23, so that the heat insulation surface 22 is in contact with the large surface 111 of the single battery 11 through the metal member 50, thereby increasing an isolation distance between the heat insulation element 24 and the single battery 11, and further improving the safety performance of the battery pack.

The metal member 50 may be used for heat exchange, and as shown in fig. 9, the heat conducting element 23 is a metal plate, a channel 231 is formed inside the metal plate, a cavity 51 is formed inside the metal member 50, the channel 231 may be a heat exchange channel, the cavity 51 may also be a heat exchange channel, and gas, liquid, or phase change material and the like may be arranged inside the heat exchange channel.

The channel 231 may be plural, and the cavity 51 may be plural. Alternatively, there may be one channel 231 and one cavity 51.

The metal member 50 may also be used for heat insulation, for example, the metal member 50 may be coated with a heat insulation coating, or a cavity 51 inside the metal member 50 may be filled with a heat insulation medium, for example, aerogel, foam, or a fiberglass member, etc., or the cavity 51 may also be filled with a liquid heat insulation medium or a gas heat insulation medium, etc., which is not limited herein.

In one embodiment, the insulating element 24 is a thermal barrier coating or a thermal insulating mat, which also ensures a relatively simple construction of the insulating element 24, while achieving an effective heat barrier.

When the thermal insulation element 24 is a thermal insulation coating, the thermal insulation coating may be directly coated on the heat conducting element 23, and of course, in some embodiments, it is not excluded that the thermal insulation coating may be directly coated on the single battery 11, and a surface of the thermal insulation coating, which is in contact with the single battery 11, is the thermal insulation surface 22, so that the thermal insulation coating realizes effective blocking of heat of the single battery 11.

When the heat insulating element 24 is a heat insulating pad, the heat insulating pad may be connected to the heat conducting element 23, for example, the heat insulating pad may be bonded to the heat conducting element 23, and the surface of the heat insulating pad contacting the battery cell 11 is the heat insulating surface 22, so that the heat insulating pad can effectively block the heat of the battery cell 11.

In one embodiment, the thermal insulation element 24 is a thermal insulation coating layer, and the thermal insulation coating layer is disposed on the outer surface of the heat conduction element 23 so as to be in contact with the large surface 111 of the unit cell 11, thereby forming a reliable thermal insulation effect.

In one embodiment, the heat insulating element 24 is a heat insulating pad, and the heat insulating pad is adhesively connected to the heat conducting element 23, so that the connection stability between the heat conducting element 23 and the heat insulating element 24 can be ensured on the basis of ensuring effective heat insulation of the heat insulating element 24.

In one embodiment, the insulating element 24 comprises an insulating mat and an insulating coating disposed on an outer surface of the insulating mat, and/or an outer surface of the thermally conductive element 23. The common arrangement of heat insulating mattress and thermal barrier coating can further increase thermal-insulated ability to this security performance who improves the battery to when can avoid one of them damage, and the unable problem of hindering heat appears.

The thermal barrier coating may be applied to the side of the thermal barrier mat facing the large surface 111 of the unit cell 11, or the thermal barrier coating may be applied to the side of the thermal barrier mat facing the heat conducting member 23, or both opposite sides of the thermal barrier mat may have the thermal barrier coating.

In one embodiment, the thermal conductivity of the thermal insulation element 24 is less than or equal to 0.05W/(m · k), so that the thermal insulation element 24 can have a reliable thermal insulation effect, and even when a thermal runaway occurs in one single battery 11, the thermal insulation element can effectively prevent heat from being transferred to another adjacent single battery 11, thereby avoiding the linked thermal runaway problem, and thus improving the safety performance of the battery pack.

The thermal conductivity of the heat insulating member 24 may be 0.05W/(m.k), 0.04W/(m.k), 0.035W/(m.k), 0.03W/(m.k), 0.029W/(m.k), 0.028W/(m.k), 0.025W/(m.k), 0.024W/(m.k), 0.023W/(m.k), 0.022W/(m.k), 0.021W/(m.k), 0.02W/(m.k), 0.01W/(m.k), or 0.004W/(m.k), or the like.

In one embodiment, the thickness of the heat conducting element 23 is 3mm-8mm, and on the basis of ensuring that the heat conducting element 23 has reliable heat exchange capability, the space utilization rate of the battery pack is prevented from being affected by the excessive thickness of the heat conducting element 23, so as to ensure that the battery pack has reliable energy density.

The thickness of the heat conducting element 23 may be 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm or 8mm, etc.

In one embodiment, the thickness of the insulating element 24 is less than 5mm, so that the excessive thickness of the insulating element 24 can be avoided to occupy a larger grouping space, thereby improving the space utilization rate of the battery pack and further improving the energy density of the battery.

In one embodiment, the thickness of the insulating element 24 is less than or equal to 3mm, thereby further reducing the thickness of the insulating element 24 and improving the space utilization rate of the battery pack.

In one embodiment, the thickness of the separation unit 20 is 4mm to 13mm, and on the basis of ensuring that the separation unit 20 has reliable heat exchange capability and heat insulation capability, the separation unit 20 is prevented from occupying too much space, so that the space utilization rate of the battery pack is improved.

The thickness of the partition unit 20 may be 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 12.6mm, 12.7mm, 12.8mm, 12.9mm, 13mm, or the like.

In one embodiment, at least one of the heat conductive member 23 and the heat insulating member 24 includes a buffer portion to absorb expansion of the large surface 111 of the unit cell 11, thereby ensuring the use performance of the unit cell 11.

After the single battery 11 is used for a long time, the single battery 11 may have a swelling problem, especially on the large surface 111 of the single battery 11, at this time, at least one of the heat conducting element 23 and the heat insulating element 24 includes a buffer portion, so that the single battery 11 can extrude the buffer portion in the swelling process, and thus the buffer portion can be compressed, that is, the buffer portion absorbs the swelling of the large surface 111 of the single battery 11, so that the single battery 11 can be ensured to normally exert its energy at a later stage, and the safety risk caused by the fact that the swelling force cannot be released is avoided.

When the heat conducting member 23 is a metal plate, the channel of the metal plate may be used as a buffer, that is, the channel 231 may be compressed, thereby achieving the expansion absorption of the large surface 111 of the unit cell 11. When the heat insulating element 24 is a heat insulating mat, the expansion absorption of the large surface 111 of the unit cell 11 can be achieved by utilizing the elastic capability of the heat insulating element itself.

In one embodiment, the distance between the two opposite ends of the heat insulating element 24 is greater than the distance between the two opposite ends of the heat conducting element 23 along the installation direction perpendicular to the stacking direction, so that the heat insulating element 24 with a relatively large size can be used as a positioning structure on the basis of ensuring that the heat insulating element 24 reliably blocks heat, thereby not only facilitating the installation of the separation unit 20 between the single batteries 11, but also being used as a positioning structure during the subsequent installation process, and avoiding damage to the heat conducting element 23.

In one embodiment, as shown in fig. 1, the battery pack further includes a battery case 30, the battery cell 10 being disposed in the battery case 30; the installation direction is perpendicular to the bottom surface of the battery box 30, so that the heat insulation element 24 is connected to the bottom surface, and the heat conduction element 23 is spaced from the bottom surface, so that the heat insulation element 24 can be positioned and connected to the battery box 30 as a positioning structure, and the heat conduction element 23 can be suspended, thereby preventing the battery box 30 from damaging the heat conduction element 23.

In the mounting direction, the side of the heat insulating element 24 facing the bottom surface of the battery case 30 may be flush with the side of the unit batteries 11 facing the bottom surface of the battery case 30; alternatively, the side of the heat insulation element 24 facing the bottom surface of the battery case 30 may be higher than the side of the single battery 11 facing the bottom surface of the battery case 30, and other connection structures, such as glue layers, may be provided between the single battery 11 and the bottom surface of the battery case 30; alternatively, the side of the heat insulating member 24 facing the bottom surface of the battery case 30 may be lower than the side of the unit batteries 11 facing the bottom surface of the battery case 30, and other connecting structures, for example, a glue layer, may be provided between the heat insulating member 24 and the bottom surface of the battery case 30.

One side of the heat insulating member 24 facing the bottom surface of the battery case 30 is higher than one side of the heat conductive member 23 facing the bottom surface of the battery case 30, and the other side of the heat insulating member 24 facing away from the bottom surface of the battery case 30 may be flush with the other side of the heat conductive member 23 facing away from the bottom surface of the battery case 30.

As shown in fig. 1, a stacking direction of the plurality of unit cells 11 of the battery unit 10 is denoted as a, and a mounting direction perpendicular to the stacking direction may be denoted as B, in which case the mounting direction B may be a direction perpendicular to the bottom surface of the battery case 30.

It should be noted that the plurality of unit batteries 11 are arranged along a stacking direction, and the installation direction is perpendicular to the stacking direction, and the installation direction may be a direction perpendicular to the bottom surface of the battery case 30; alternatively, the mounting direction may be a direction perpendicular to the side of the battery case 30, in which case the distance between the opposite ends of the heat insulating member 24 is greater than the distance between the opposite ends of the heat conducting member 23 in the mounting direction perpendicular to the stacking direction, and the heat insulating member 24 may also be used in connection with the side of the battery case 30.

In some embodiments, it is not excluded that the distance between the opposite ends of the heat insulating member 24 may be equal to the distance between the opposite ends of the heat conducting member 23 in the mounting direction perpendicular to the stacking direction, and the heat insulating member 24 and the heat conducting member 23 may be disposed in a staggered manner, so that the heat insulating member 24 may also be connected to the battery case 30 and the heat conducting member 23 may be spaced apart from the battery case 30.

Alternatively, it is not excluded that the distance between the opposite ends of the heat insulating member 24 may be smaller than the distance between the opposite ends of the heat conducting member 23 in the mounting direction perpendicular to the stacking direction, and the heat insulating member 24 and the heat conducting member 23 may be disposed in a staggered manner, so that the heat insulating member 24 may be connected to the battery case 30 and the heat conducting member 23 may be spaced from the battery case 30.

Alternatively, the distance between both ends of the heat conducting member 23 facing the side wall of the battery case 30 may be greater than the distance between both ends of the heat insulating member 24 facing the side wall of the battery case 30, thereby facilitating the connection of the heat conducting member 23 with the heat exchange line 40.

It should be noted that, the specific structure of the battery case 30 is not limited herein, the battery case 30 is used for mounting the single batteries 11, and the battery case 30 may form a sealed space for supplying power to a vehicle and the like. Alternatively, the battery case 30 may communicate with the outside environment for storage or the like.

In one embodiment, at least one of the heat exchange surface 21 and the thermal insulation surface 22 is adhesively fixed to the large surface 111 of the unit cell 11, so that it can be ensured that the partition unit 20 can be stably disposed between two adjacent unit cells 11, thereby ensuring the safety performance of the battery.

The heat-exchanging surface 21 can be connected with the single battery 11 through a heat-conducting structural adhesive, and the heat-insulating surface 22 can be connected with the single battery 11 through aerogel.

In one embodiment, as shown in fig. 10, the partition unit 20 includes a metal structure, at least a first channel layer 25 and a second channel layer 26 are formed inside the metal structure, and the first channel layer 25 and the second channel layer 26 are respectively a heat exchange channel and a heat insulation channel to respectively form a heat exchange surface 21 and a heat insulation surface 22, that is, the heat exchange element and the heat insulation element can be formed through the channel inside the metal structure, which not only can meet the requirements of heat exchange and heat insulation, but also has strong structural stability of the metal structure, thereby increasing the safety performance and the service life of the battery pack.

The metal structure may be a unitary structure, and both sides of the metal structure may be formed with a first channel layer 25 and a second channel layer 26, respectively, for example, the first channel layer 25 and the second channel layer 26 may be formed by a plurality of separated channels, respectively, as shown in fig. 10. Of course, the first channel layer 25 and the second channel layer 26 may be two large ports, respectively.

The first channel layer 25 is a heat exchange channel, and the inside of the heat exchange channel may be filled with heat exchange gas, heat exchange liquid, or phase change material.

The second channel layer 26 is an insulating channel filled with an insulating medium, for example, aerogel, foam, or fiberglass member, etc., or the inside of the insulating channel may be filled with a liquid insulating medium or a gas insulating medium, etc., which is not limited herein.

In one embodiment, as shown in fig. 11, the partition unit 20 includes a metal structure, at least a first channel layer 25 and a second channel layer 26 are formed inside the metal structure, the first channel layer 25 and the second channel layer 26 are respectively a heat insulation channel and a channel to form a heat exchange surface 21 and a heat insulation surface 22, and a buffer portion 27 is provided between the first channel layer 25 and the second channel layer 26, so that the buffer portion 27 absorbs expansion of the large surface 111 of the single battery 11, and the single battery 11 or the metal structure is prevented from being pressed, thereby ensuring safe use performance of the single battery 11.

In one embodiment, the heat conducting element 23 is not disposed between the heat insulating surface 22 and the large surface 111 of the single battery 11 on the side away from the heat exchanging surface 21, that is, when the heat insulating surface 22 and the large surface 111 of the single battery 11 are in direct contact or indirect contact, the heat conducting element 23 is not disposed therebetween, so as to reduce the number of components between the single batteries 11, and thus improve the energy density of the battery pack.

In one embodiment, the heat conducting element 23 is disposed between the heat insulating surface 22 and the large surface 111 of the single battery 11 on the side away from the heat exchanging surface 21, i.e. the heat insulating surface 22 and the large surface 111 of the single battery 11 may be in indirect contact, thereby increasing the heat exchanging capability of the single battery 11.

In one embodiment, as shown in fig. 2, a separation unit 20 is disposed between two adjacent single batteries 11, so that two opposite large surfaces 111 of the single battery 11 in the middle are respectively in contact with a heat exchange surface 21 and a heat insulation surface 22, thereby improving the heat insulation capability between the single batteries 11 on the basis of improving the heat exchange of the single batteries 11, and thus improving the safety performance of the battery pack.

When the number of the unit cells 11 is three or more, the number of the partition units 20 may be two or more, for example, when the number of the unit cells 11 is three, the partition units 20 are provided on both sides of one unit cell 11 in the middle, and opposite sides of the unit cell 11 are in contact with the heat exchange surface 21 and the heat insulation surface 22, respectively, so that it can be understood that the plurality of partition units 20 are arranged in such a manner that the heat exchange surfaces 21 of the respective partition units 20 face the same direction and the heat insulation surfaces 22 face the same direction, and further, it can be considered that the heat conduction element 23, the heat insulation element 24, the heat conduction element 8230, the 8230, are alternately arranged, or the heat insulation element 24, the heat conduction element 23, the heat conduction element 24, the heat conduction element 23, the 8230, and the 8230are alternately arranged.

As shown in fig. 3, a separation unit 20 may be disposed between the two unit cells 11, and a heat insulating member 24 and a heat conducting member 23 may be disposed on the other large surfaces 111 of the two unit cells 11, respectively.

As shown in fig. 4, the two opposite large surfaces 111 of one unit cell 11 may be provided with a heat insulating member 24 and a heat conducting member 23, respectively.

In one embodiment, at least one of the opposite ends of the battery unit 10 is provided with the heat insulating member 24 in the stacking direction, so that the problem of too rapid heat dissipation of the unit cells 11 located at the ends can be avoided, and the stable balance of the whole battery unit 10 can be ensured, thereby enabling the battery pack to achieve the optimal use state.

In one embodiment, the single batteries 11 are lithium iron phosphate batteries, so that heat can be stored through the heat insulation element 24 arranged at the end portion, and the problem of excessive heat loss of the single batteries 11 at the end portion is avoided, so as to ensure the service performance of the battery pack.

The battery can be a lithium iron phosphate system battery, the energy density of the lithium iron phosphate system battery can be 120wh/kg-190wh/kg, and the energy density of the lithium iron phosphate system battery can be 120wh/kg, 121wh/kg, 125wh/kg, 140wh/kg, 150wh/kg, 160wh/kg, 170wh/kg, 180wh/kg, 185wh/kg, 188wh/kg, 190wh/kg and the like.

In one embodiment, the opposite ends of the battery unit 10 are respectively provided with the heat conducting element 23 and the heat insulating element 24 along the stacking direction, so that the opposite large surfaces 111 of each unit cell 11 can be respectively in contact with the heat conducting element 23 and the heat insulating element 24, and on the basis of ensuring reliable heat exchange, the heat insulating efficiency is further ensured, and the safety performance of the battery is further ensured.

In one embodiment, the opposite ends of the battery unit 10 are not provided with the heat conducting elements 23 or the heat insulating elements 24 along the stacking direction, so that the two unit batteries 11 at the end can freely exchange heat, thereby improving the heat exchange capability of the battery unit 10 and the safety use performance of the battery pack.

In one embodiment, the heat conducting elements 23 are disposed between the adjacent single batteries 11, so that each heat conducting element 23 can reliably dissipate heat of each single battery 11, and thus the heat exchange capability of the battery unit 10 is ensured, thereby reducing the possibility of thermal runaway of the single batteries 11.

For example, the number of the single batteries 11 may be three or more, for example, when there are three single batteries 11, a separation unit 20 may be disposed between two single batteries 11, the separation unit 20 includes a heat conducting element 23 and a heat insulating element 24, and only the heat conducting element 23 may be disposed between two other single batteries 11, that is, part of the structural arrangement of the battery pack may be the single batteries 11, the heat conducting element 23, the heat insulating element 24, the single batteries 11, the heat conducting element 23, and the single batteries 11.

When the number of the unit cells 11 is three or more, the separation unit 20 may be disposed between two adjacent unit cells 11, or only the heat conduction element 23 may be disposed between some unit cells 11, which is not limited herein.

In one embodiment, the heat insulation elements 24 are disposed between the adjacent single batteries 11, and the number of the heat insulation elements 24 is less than that of the heat conduction elements 23, so that the space of the battery pack occupied by the heat insulation elements 24 can be reduced, the space utilization rate of the battery pack can be improved, and the energy density of the battery pack can be further improved.

It should be noted that the heat insulation element 24 may not be disposed between any two adjacent single batteries 11, after all, the heat insulation requirement may be relatively small relative to the requirement for heat dissipation, and it may also be sufficient to avoid the chain thermal runaway problem caused by the single batteries 11 under the normal use condition of the battery pack.

In one embodiment, the heat conducting elements 23 are disposed between the adjacent single batteries 11, the heat insulating elements 24 are disposed between the adjacent single batteries 11, and the number of the heat insulating elements 24 is less than that of the heat conducting elements 23, so that the heat conducting elements 23 can reliably dissipate heat of the single batteries 11, and the heat insulating elements 24 can thermally block part of the single batteries 11, thereby improving the space utilization rate of the battery pack and ensuring the safety service performance of the battery.

It should be noted that some of the unit batteries 11 may not have the heat conducting element 23 and the heat insulating element 24 disposed therebetween, or any two adjacent unit batteries 11 may have the heat conducting element 23 and the heat insulating element 24 disposed therebetween, but one unit battery 11 at the end may have the heat conducting element 23 disposed thereon, so that the number of the heat conducting elements 23 is greater than that of the heat insulating elements 24.

In some embodiments, it is not excluded that the number of the heat insulating elements 24 is greater than the number of the heat conducting elements 23, for example, the heat conducting elements 23 and the heat insulating elements 24 may be disposed between any two adjacent unit batteries 11, but the heat insulating element 24 may be disposed on one unit battery 11 located at the end.

In one embodiment, the heat insulation element 24 is not arranged between at least some of the parallel-connected single batteries 11, and when one of the parallel-connected single batteries 11 is out of control thermally, heat is directly transferred through the bus bar, so that the heat insulation element 24 has a small effect, and the heat insulation element 24 can be omitted, thereby improving the space utilization rate of the battery pack.

It should be noted that, each of the single batteries 11 of one battery unit 10 may be partially connected in series and partially connected in parallel, and the heat insulation element 24 may not be disposed between the parallel-connected single batteries 11; alternatively, each of the unit cells 11 of one battery unit 10 may be connected in parallel, and the heat insulating element 24 may not be disposed between the unit cells 11 that are partially connected in parallel.

In some embodiments, each of the unit cells 11 of one battery unit 10 may be connected in series.

In one embodiment, the battery pack further includes a plurality of unit cells 11 arranged in parallel, and no heat insulating element 24 is arranged between at least some of the unit cells 11 arranged in parallel. That is, in addition to the battery unit 10, the battery pack may further include a plurality of unit cells 11 arranged in parallel, and the heat insulating member 24 may not be provided between at least parts of the part of the unit cells 11.

In one embodiment, besides the battery unit 10, the battery pack may further include a plurality of unit batteries 11 connected in parallel, and a heat conducting element 23 is disposed between the parallel unit batteries 11, so as to ensure reliable heat exchange of the unit batteries 11, thereby improving the safety performance of the battery pack.

In one embodiment, when the heat insulation elements 24 are not arranged between any adjacent single batteries 11, the thickness of the heat insulation elements 24 is greater than or equal to 2mm, that is, the heat insulation elements 24 with relatively small number can improve the utilization rate of the internal space of the battery pack, so that the thickness of the heat insulation elements 24 is increased at the same time, thereby improving the heat blocking capability of the heat insulation elements 24.

In one embodiment, the unit cell 11 is made of a ternary positive electrode material, i.e., the unit cell 11 may be a ternary system battery, so that good heat insulation and heat exchange may be achieved by the separation unit 20, thereby improving the safety performance of the battery pack.

The unit cell 11 may be a ternary system battery, the energy density of which may be 200wh/kg to 300wh/kg, and the energy density of which may be 200wh/kg, 201wh/kg, 210wh/kg, 220wh/kg, 230wh/kg, 240wh/kg, 248wh/kg, 250wh/kg, 260wh/kg, 270wh/kg, 280wh/kg, 290wh/kg, 295wh/kg, 298wh/kg, 300wh/kg, and so forth.

In some embodiments, the energy density of the ternary system battery may also be 190wh/kg-200wh/kg. In certain embodiments, it is not excluded that the energy density of the ternary system battery may also be less than 190wh/kg.

Note that the unit cell includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacking portion, wherein the stacking portion comprises a first pole piece, a partition and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. And the polarities of the first pole piece and the second pole piece can be interchanged. The first pole piece and the second pole piece are coated with active materials.

In one embodiment, the single battery may be a square battery, that is, the single battery may be a quadrangular prism type battery, which mainly refers to a prismatic battery whose shape is a prism shape, but does not strictly limit whether each edge of the prism is a straight line in a strict sense, and a corner between the edges is not necessarily a right angle, and may be an arc transition.

The single battery can be a laminated battery, which is convenient to assemble and can be processed to obtain a battery with longer length. Specifically, electric core is lamination formula electric core, and electric core has first pole piece that stacks up each other, with first pole piece opposite electric property's second pole piece and the diaphragm of setting between first pole piece and second pole piece to make many to pile up and form lamination formula electric core to first pole piece and second pole piece.

Or, the single battery may be a winding battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a winding battery core.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of single batteries 11, and the single batteries 11 may be square batteries, and the battery module may further include end plates and side plates for fixing the plurality of single batteries 11.

The battery pack includes a plurality of unit batteries 11 and a battery case for fixing the plurality of unit batteries 11.

It should be noted that the battery pack includes a plurality of single batteries 11, and the plurality of single batteries 11 are disposed in the battery box. The plurality of single batteries 11 may form a battery module and then be mounted in the battery box. Alternatively, the plurality of single batteries 11 may be directly disposed in the battery box, that is, the plurality of single batteries 11 are fixed by the battery box without grouping the plurality of single batteries 11.

In some embodiments, the battery unit 10 may be a plurality of battery units 10, and one separation unit 20 may be shared between two adjacent unit batteries 11 in the plurality of battery units 10, for example, two battery units 10 may be provided, so that one separation unit 20 may be clamped between two pairs of unit batteries 11, thereby facilitating the installation of the separation unit 20.

Alternatively, the battery unit 10 may be plural, and an independent separation unit 20 may be disposed between two adjacent unit batteries 11 in each battery unit 10.

As shown in fig. 1, a plurality of battery units 10 may be provided, a plurality of battery units 10 are disposed in the battery box 30, and the plurality of battery units 10 may share the partition unit 20, or the plurality of battery units 10 may share the heat exchange duct 40.

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

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

Claims (26)

1. A battery pack, comprising:

a battery unit (10), the battery unit (10) comprising a plurality of single batteries (11), the stacking direction of the plurality of single batteries (11) being perpendicular to the large surfaces (111) of the single batteries (11);

the battery pack comprises a separation unit (20), the separation unit (20) is arranged between two adjacent single batteries (11), two opposite sides of the separation unit (20) comprise a heat exchange surface (21) and a heat insulation surface (22), and the heat exchange surface (21) and the heat insulation surface (22) are respectively in contact with the large surfaces (111) of two adjacent single batteries (11), so that the separation unit (20) is in heat exchange contact with the large surface (111) of one single battery (11) and in heat insulation contact with the large surface (111) of the other single battery (11).

2. The battery pack according to claim 1, wherein the partition unit (20) comprises:

a heat conducting element (23), the heat conducting element (23) having the heat exchanging surface (21);

an insulating element (24), the insulating element (24) having the insulating face (22);

wherein the heat-conducting element (23) is connected to the heat-insulating element (24).

3. The battery pack according to claim 2, wherein the heat insulating element (24) is a heat insulating coating layer provided on an outer surface of the heat conducting element (23), or wherein the heat insulating element (24) is a heat insulating mat adhesively attached to the heat conducting element (23), or wherein the heat insulating element (24) comprises a heat insulating mat and a heat insulating coating layer provided on an outer surface of the heat insulating mat and/or an outer surface of the heat conducting element (23).

4. The battery pack according to claim 2 or 3, wherein the heat conducting element (23) is a metal plate having a channel (231) formed therein, or the heat conducting element (23) is a heating film, or the heat conducting element (23) comprises a metal plate and a heating film.

5. Battery pack according to claim 4, characterized in that it further comprises a metal piece (50), said metal piece (50) being arranged on the side of the insulating element (24) facing away from the heat conducting element (23) so that the insulating surface (22) is in contact with the large surface (111) of the battery cell (11) through said metal piece (50);

wherein, a cavity (51) is formed inside the metal piece (50).

6. The battery according to claim 2, characterized in that the thermal conductivity of the insulating element (24) is ≦ 0.05W/(m-k).

7. Battery pack according to claim 2, characterized in that the thickness of the heat conducting element (23) is 3-8 mm and/or the thickness of the heat insulating element (24) is less than 5mm.

8. Battery pack according to claim 7, characterised in that the thickness of the insulating element (24) is ≦ 3mm.

9. Battery pack according to claim 2, characterized in that at least one of the heat conducting element (23) and the heat insulating element (24) comprises a buffer to absorb expansion of the large surface (111) of the battery cell (11).

10. Battery pack according to claim 2, characterized in that the distance between the opposite ends of the heat-insulating element (24) is greater than the distance between the opposite ends of the heat-conducting element (23) in the mounting direction perpendicular to the stacking direction.

11. The battery pack according to claim 10, further comprising a battery case in which the battery cell (10) is disposed;

wherein the installation direction is perpendicular to the bottom surface of the battery case such that the heat insulating member (24) is connected to the bottom surface, and the heat conducting member (23) is spaced apart from the bottom surface.

12. The battery pack according to claim 1, wherein the partition unit (20) comprises a metal structure having at least a first channel layer (25) and a second channel layer (26) formed therein, the first channel layer (25) and the second channel layer (26) being a heat exchange channel and an insulation channel, respectively, to form the heat exchange surface (21) and the insulation surface (22), respectively;

or, the separation unit (20) comprises a metal structure, at least a first channel layer (25) and a second channel layer (26) are formed inside the metal structure, the first channel layer (25) and the second channel layer (26) are respectively a heat exchange channel and a heat insulation channel to respectively form the heat exchange surface (21) and the heat insulation surface (22), and a buffer part (27) is arranged between the first channel layer (25) and the second channel layer (26).

13. Battery pack according to claim 1, characterized in that no heat conducting element (23) is arranged between the thermal insulation surface (22) and the large surface (111) of the battery cell (11) on the side remote from the heat exchanging surface (21).

14. Battery pack according to claim 1, characterized in that a heat conducting element (23) is arranged between the heat insulating surface (22) and the large surface (111) of the battery cell (11) on the side remote from the heat exchanging surface (21).

15. Battery according to claim 1, characterized in that at least one of the heat exchanging surface (21) and the heat insulating surface (22) is adhesively fixed to a large surface (111) of the battery cell (11).

16. The battery pack according to claim 1, wherein the separation unit (20) is disposed between two adjacent single batteries (11) so that two opposite large surfaces of the single battery (11) located in the middle are in contact with a heat exchange surface (21) and a heat insulation surface (22), respectively.

17. The battery pack according to claim 1, wherein at least one of opposite ends of the battery cell (10) in the stacking direction is provided with a heat insulating member (24).

18. The battery pack according to claim 17, characterized in that the unit cells (11) are lithium iron phosphate system cells.

19. The battery pack according to claim 1, wherein opposite ends of the battery cell (10) in the stacking direction are provided with a heat conductive member (23) and a heat insulating member (24), respectively.

20. The battery pack according to claim 1, wherein opposite ends of the battery cells (10) in the stacking direction are not provided with heat conductive elements (23) or heat insulating elements (24).

21. The battery pack according to claim 1, characterized in that a heat conducting element (23) is arranged between adjacent cells (11), and a heat insulating element (24) is arranged between adjacent cells (11), the number of heat insulating elements (24) being smaller than the number of heat conducting elements (23).

22. Battery pack according to claim 21, characterized in that no insulating element (24) is arranged between the at least partially parallel-connected battery cells (11).

23. The battery pack according to claim 1, characterized in that the battery pack further comprises a plurality of cells (11) arranged in parallel, at least some of the cells (11) arranged in parallel being free of thermal insulation elements (24) arranged therebetween.

24. The battery pack according to claim 23, characterized in that a heat conducting element (23) is arranged between the parallel-connected single cells (11).

25. Battery pack according to any of claims 21 to 24, characterized in that the thickness of the insulating element (24) is ≧ 2mm.

26. The battery pack according to claim 1, characterized in that the unit cells (11) employ a ternary positive electrode material.

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