CN218602557U

CN218602557U - Battery pack

Info

Publication number: CN218602557U
Application number: CN202222930608.7U
Authority: CN
Inventors: 席兵荣; 罗峥
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-03-10
Anticipated expiration: 2032-11-03

Abstract

A battery pack relates to the technical field of batteries; the battery pack comprises a thermal management piece and a plurality of battery cell units; the thermal management piece comprises a thermal management first part and a plurality of thermal management second parts; the plurality of thermal management second parts are sequentially arranged at intervals along the length extending direction of the thermal management first part; a battery cell unit is connected between every two adjacent heat management second parts, a first surface of each battery cell unit is connected with the heat management first part, and a second surface of each battery cell unit is connected with the heat management second part; the first surface and the second surface of the cell unit are adjacent to each other, and the second surface is the largest surface. The battery pack includes a battery module. The utility model discloses solve to a certain extent and how to carry out effectual heat dissipation to the electric core of battery to avoid appearing the technical problem of thermal runaway.

Description

Battery pack

Technical Field

The utility model relates to a battery technology field particularly, relates to a battery pack.

Background

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and multiple fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

During use of the battery, the cells within the battery may generate heat. If the heat is too high, the performance and the service life of the battery are adversely affected, and serious thermal runaway can cause safety problems such as fire hazard. Therefore, how to effectively dissipate heat of the battery cell becomes an important research direction in the field. Meanwhile, how to take away the heat of the battery core in time to avoid the generation of thermal runaway becomes an industry focus problem. In the traditional technical scheme, the liquid cooling plate only dissipates heat with a certain side surface of the battery cell, and the liquid cooling effect of the liquid cooling plate cannot meet the requirement of rapid heat dissipation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery package to solve to a certain extent and how to carry out effective quick heat dissipation to the electric core of battery, in order to avoid the technical problem that thermal runaway appears.

In order to achieve the above object, the present invention provides the following technical solutions:

a battery pack comprising a thermal management and a plurality of cell units, the cell units comprising at least one cell unit; when the number of the battery cell units is multiple, the battery cell units are regularly stacked along one or more of a first direction, a second direction and a third direction, wherein the first direction, the second direction and the third direction are mutually perpendicular; the battery cell unit comprises a first surface and two second surfaces, and the two second surfaces are connected to the first surface and are oppositely arranged;

the thermal management piece comprises a thermal management first part and a plurality of thermal management second parts; the plurality of thermal management second parts are sequentially arranged on the same side surface of the thermal management first part at intervals along the length extending direction of the thermal management first part;

the battery cell unit is arranged between every two adjacent heat management second parts, the first surface is connected with the heat management first parts, and the two second surfaces are respectively connected with the adjacent heat management second parts; the second surface is the largest surface of the cell unit;

a first heat management cooling cavity for leading in a cooling medium is arranged in the first heat management part, and a second heat management cooling cavity for leading in the cooling medium is arranged in the second heat management part; the thermal management first cooling cavity is in communication with the thermal management second cooling cavity.

In the foregoing technical solution, optionally, the battery cell units are arranged in a matrix along a second direction and a length extending direction of the thermal management first portion, the thermal management first portion is located on a side surface of the battery cell unit along the second direction, and the second direction intersects with the length extending direction of the thermal management first portion.

In any of the foregoing technical solutions, optionally, in the length extending direction of the thermal management first portion, a relationship between a size D of the thermal management second portion and a size H of the battery cell unit is: D/H is more than or equal to 0.01 and less than or equal to 30.

In any of the above technical solutions, optionally, in a length extending direction of the thermal management first portion, a dimension of the thermal management second portion is D, and a surface area of the second surface overlapping with the thermal management second portion is a;

the relation between D and A is as follows: 0.01mm ^-1 ≤D/A×1000≤5mm ^-1 。

In any of the above technical solutions, optionally, in the length extending direction of the thermal management first portion, a relation between a wall thickness dimension B of the thermal management second portion and a dimension C of the thermal management second cooling cavity is as follows: B/C is more than or equal to 0.01 and less than or equal to 30.

In any of the above technical solutions, optionally, the relationship between B and C is: B/C is more than or equal to 0.04 and less than or equal to 15.

In any of the above technical solutions, optionally, the battery module further includes a positive connector and a negative connector opposite to the first surface;

the first surface is provided with a positive electrode and a negative electrode; the positive electrode is electrically connected with the positive connecting piece, and the negative electrode is electrically connected with the negative connecting piece;

the thermal management first portion is located between the positive connector and the negative connector, or the positive connector, the first surface and the negative connector are all connected with the thermal management first portion.

In any of the above technical solutions, optionally, the thermal management first cooling cavity includes a first cooling inlet cavity and a first cooling outlet cavity;

each heat management second cooling cavity is communicated with the first cooling inlet cavity and the first cooling outlet cavity;

the first heat management part is provided with a first connecting pipe nozzle and a second connecting pipe nozzle, the first connecting pipe nozzle is communicated with the first cooling inlet cavity, and the second connecting pipe nozzle is communicated with the first cooling outlet cavity;

the number of the heat management first parts is multiple, the heat management first parts are sequentially arranged at intervals along a second direction, and the second direction is intersected with the length extension direction of the heat management first parts; the first connecting pipe mouths are communicated, and the second connecting pipe mouths are communicated.

In any of the above technical solutions, optionally, the number of the thermal management first portions is multiple, and the multiple thermal management first portions are sequentially arranged at intervals along the second direction; wherein the second direction intersects a direction of length extension of the thermal management first portion; the thermal management first cooling cavities of each thermal management first section are in communication.

In any of the foregoing technical solutions, optionally, the first thermal management part and/or the second thermal management part is connected to the battery cell unit by gluing;

the first thermal management part and/or the second thermal management part are connected with the battery cell units through a heat-conducting elastic material layer.

The beneficial effects of the utility model mainly lie in:

the utility model provides a battery pack, three surface through electric core unit respectively with heat management first portion, heat management second portion is connected, wherein two surfaces are the biggest face, realize trilateral the surrounding to electric core unit promptly, and set up the first cooling chamber of heat management and heat management second cooling chamber respectively in heat management first portion and heat management second portion, so both can increase electric core unit's heat radiating area, effective to electric core unit, quick heat dissipation, can also be through the heat transfer between the adjacent electric core unit of the effective separation of heat management second portion, the heat of avoiding or reducing electric core unit stretchs and causes the thermal runaway, the safety heat management performance of battery pack has been promoted.

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

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of a single thermal management unit and a battery cell unit according to an embodiment of the present invention;

fig. 4 is a schematic view of an assembly of a single thermal management member and a cell unit shown in fig. 3;

fig. 5 is a first angle schematic of the single thermal management member and the cell unit shown in fig. 4;

fig. 6 is an enlarged view of a region i of a single thermal management member and cell unit shown in fig. 5;

fig. 7 is an enlarged view of a region ii of the single thermal management member and cell unit shown in fig. 5.

Icon: 1-a cell unit; 101-a first surface; 102-a second surface; 2-a thermal management; 201-thermally managing the first section; 202-thermally managing the second section; 3-a first connection pipe; 4-a first connecting nozzle; 5-a second connecting pipe; 6-second connection nozzle.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.

Examples

The present embodiment provides a battery pack; referring to fig. 1 to 7, fig. 1 is a schematic structural diagram (a part of an electrical structure is not shown) of a battery pack provided in the present embodiment, and fig. 2 is an exploded view (a part of an electrical structure is not shown) of the battery pack provided in the present embodiment; in order to show the structure more clearly, fig. 3 to fig. 5 are schematic structural diagrams of a single thermal management member and a corresponding cell unit provided in this embodiment, where fig. 3 is a perspective view of the single thermal management member and the cell unit, fig. 4 is an assembly view of the single thermal management member and the cell unit shown in fig. 3, fig. 5 is a front view of the single thermal management member and the cell unit shown in fig. 4, fig. 6 is an enlarged view of a region i of the single thermal management member and the cell unit shown in fig. 5, and fig. 7 is an enlarged view of a region ii of the single thermal management member and the cell unit shown in fig. 5.

The battery pack provided by the embodiment is used for a power battery, and is used for energy storage power systems such as hydraulic power, fire power, wind power and solar power stations, and is also used for electric vehicles such as electric bicycles, electric motorcycles and electric automobiles.

Referring to fig. 1 to 7, the battery pack in the present embodiment includes a thermal management member 2 and a plurality of cell units 1; the battery cell unit 1 comprises at least one battery cell; when the number of the battery cell monomers is multiple, the battery cell monomers are regularly stacked along one or more of the first direction, the second direction and the third direction, and it can be understood that the regular stacking means that the battery cell monomers are spatially arranged to form an mxn or mxnxp form, wherein m is greater than or equal to 0, n is greater than or equal to 0, p is greater than or equal to 0, and m, n and p are not equal to zero at the same time; the first direction, the second direction and the third direction are mutually vertical; that is, the battery cell unit 1 includes one or more battery cells, wherein when the battery cell unit 1 includes a plurality of battery cells, the plurality of battery cells are arranged in a matrix to form a regular hexahedral structure; moreover, the number of the battery cells in the multiple battery cell units 1 may be different from each other, for example, one of the battery cell units 1 includes one battery cell, and the other battery cell units 1 include multiple battery cells, or each battery cell unit 1 includes different numbers of battery cells, which is not exhaustive here.

The cell unit in the present embodiment is preferably a square-shell cell.

The battery cell unit 1 includes a first surface 101 and two second surfaces 102, and the two second surfaces 102 are both connected to the first surface 101 and are disposed oppositely, that is, three surfaces of the battery cell monomers connected in sequence along the same surrounding direction, or three surfaces of the hexahedral structure formed by a plurality of battery cell monomers connected in sequence along the same surrounding direction. It should be noted that the cell unit 1 of course further includes other surfaces to form a regular closed hexahedron or other polyhedral structure by enclosing with the first surface 101 and the second surface 102, and details thereof are not described here.

The thermal management 2 comprises a thermal management first section 201 and a plurality of thermal management second sections 202; the thermal management second portions 202 are sequentially arranged on the same side of the thermal management first portion 201 at intervals along the length extending direction of the thermal management first portion 201 to form an accommodating space for accommodating the cell unit 1, wherein the length extending direction of the thermal management first portion 201 is parallel to the first direction, see fig. 5.

The cell unit 1 is arranged between two adjacent thermal management second parts 202, the first surface 101 is connected with the thermal management first part 201, the two second surfaces 102 are respectively connected with the adjacent thermal management second parts 202, and specifically, the two adjacent thermal management second parts 202 are respectively connected with two opposite second surfaces 102 of one cell unit 1; the second surface 102 is a maximum surface of the battery cell unit 1, when the battery cell unit 1 includes one battery cell monomer, the maximum surface of the battery cell unit 1 is the maximum surface of the battery cell monomer, and when the battery cell unit 1 includes a plurality of battery cell monomers, the maximum surface of the battery cell unit 1 is a surface with a maximum area of a hexahedral structure or other polyhedral structures formed by combining the battery cell monomers. In this embodiment, the battery cell unit 1 includes a top surface, a bottom surface, two side surfaces, and two large surfaces, where the top surface, the bottom surface, and the two side surfaces are respectively adjacent to the two large surfaces, the first surface 101 of the battery cell unit 1 may be the top surface, the bottom surface, or the side surface of the battery cell unit 1, and the second surface 102 is one of the two large surfaces; the first surface 101 of the cell unit 1 shown in fig. 1 to 7 is a side surface of the cell unit 1.

A first heat management cooling cavity for introducing a cooling medium is arranged in the first heat management part 201, and a second heat management cooling cavity for introducing the cooling medium is arranged in the second heat management part 202; the thermal management first cooling cavity is in communication with the thermal management second cooling cavity.

In the battery module in this embodiment, the largest surface (i.e., the second surface 102) of the battery cell unit 1 is connected to the second thermal management portion 202, and the surface (i.e., the first surface 101) adjacent to the largest surface is connected to the first thermal management portion 201, so that the contact area between the battery cell unit and the thermal management member can be increased, that is, the heat dissipation area can be increased, effective and rapid heat dissipation can be performed on the battery cell unit 1, the thermal diffusion influence between adjacent battery cell units 1 can be effectively blocked by the second thermal management portion 202, and thermal runaway caused by thermal spread of the battery cell unit 1 can be avoided or reduced; the first surface 101 of the battery cell unit 1 is connected with the first thermal management part 201, so that the efficiency of heat dissipation of the battery cell unit 1 is further improved, the battery cell unit 1 can be effectively cooled, heat generated by the battery cell unit 1 can be taken away in time, and the overall thermal management performance and safety performance of the battery pack are improved.

In the battery pack in this embodiment, the thermal management member 2 is cooled by wrapping the plurality of battery cell units 1 in multiple surfaces by using the thermal management first portion 201 and the plurality of thermal management second portions 202, so that the contact area between the battery cell units 1 and the thermal management member 2 can be effectively increased, more heat is taken away, and the heat dissipation efficiency is improved; the thermal management piece 2 can be cooled between the battery cell unit 1 and the battery cell unit 1, when the battery cell unit 1 is out of control due to heat, the thermal management piece 2 can effectively isolate the battery cell unit 1, the phenomenon that the thermal control is caused due to the fact that the thermal expansion affects other groups of the battery cell units 1 is prevented, and the safety performance of the battery is greatly improved; the thermal management piece 2 can facilitate the assembly of the battery cell unit 1 and the thermal management piece 2 by adopting a U-shaped accommodating space formed by enclosing the thermal management first part 201 and the plurality of thermal management second parts 202.

In this embodiment, the length extension direction of the thermal management first portion 201 is parallel to the first direction, and the second direction intersects with the length extension direction of the thermal management first portion 201, and preferably, the second direction is perpendicular to the first direction, as shown in fig. 5.

In this embodiment, the battery cell units 1 are arranged in a matrix along the second direction and the first direction, and the first thermal management unit 201 is located on a side surface of the battery cell unit 1 along the second direction, that is, the first thermal management unit 201 is located on a side surface of the battery cell unit 1, so that the first thermal management unit can serve as a structural support of the battery cell unit 1 at the same time to mount the battery cell unit 1, thereby effectively reducing the number of internal structural members of the battery pack and improving the energy density of the battery pack.

Referring to fig. 5 and 6, in an alternative of the present embodiment, in the length extending direction of the thermal management first portion 201, the relationship between the dimension D of the thermal management second portion 202 and the dimension H of the battery cell 1 is as follows: D/H is more than or equal to 0.01 and less than or equal to 30. For example, D/H is 0.01, 0.5, 2, 7, 8, 10, 18, 20, 25, or 30, or other values.

In this embodiment, when D/H < 0.01, the dimension D of the thermal management second portion 202 (which may be understood as the overall thickness of the thermal management second portion 202 along the first direction) is too small, and in the case of the same contact area, the space for the cooling medium in the thermal management second cooling cavity in the thermal management second portion 202 is too small, the cooling medium that can be accommodated is too small, and the relative cooling effect is too poor; when the D/H is more than 30, more cooling media can be accommodated, the relative cooling effect is sufficient, but the space occupied by the thermal management second part 202 is too large, the utilization rate of the internal space of the battery is greatly reduced, and the energy density of the battery pack is also greatly reduced; when the D/H is more than or equal to 0.01 and less than or equal to 30, the heat exchange effect is ensured, the space utilization rate of the battery is greatly improved, and the energy density of the battery is improved, so that the energy density and the heat dissipation efficiency are balanced.

Further preferably, D is related to H by: D/H is more than or equal to 0.01 and less than or equal to 8; when D/H is more than or equal to 0.01 and less than or equal to 8, the space occupied by the second heat management part 202 and the space of the cooling medium in the second heat management cooling cavity are further balanced, so that the heat exchange effect can be effectively ensured, the space utilization rate of the battery can be improved to a greater extent, and the energy density of the battery can be improved.

In an alternative of this embodiment, the surface area of the second surface 102 of the cell unit 1 overlapping the thermal management second portion 202 in the first direction is a. That is, when the entire surface of the second surface 102 of the cell unit 1 is attached to the thermal management second portion 202, the surface area of the second surface 102 of the cell unit 1 is a; when a part of the surface of the second surface 102 of the cell unit 1 is connected to the thermal management second portion 202, the surface area of the second surface 102 of the portion attached to the thermal management second portion 202 is a (in this case, a is smaller than the surface area of the second surface 102 of the cell unit 1).

In this embodiment, D and a are related as follows: 0.01mm ^-1 ≤D/A×1000≤5mm ^-1 . For example, (D/A1000) is 0.01mm ^-1 、0.05mm ^-1 、1mm ^-1 、1.2mm ^-1 、1.8mm ^-1 、2.5mm ^-1 、3mm ^-1 、4.5mm ^-1 Or 5mm ^-1 . In this embodiment, the unit of D is mm, and the unit of a is mm ² After making a comparisonThe value of (A) will appear in mm ^-1 。

In this example, when the diameter is 0.01mm ^-1 ≤D/A×1000≤5mm ^-1 In time, the heat exchange performance requirement and the size space requirement of the battery cell unit 1 can be met. Specifically, when the surface area a of the connection portion between the second surface 102 of the battery cell unit 1 and the thermal management second portion 202 is large, the cooling area is large, and the heat dissipation effect of the thermal management member 2 on the battery cell unit 1 can be improved; when the dimension D of the second thermal management part 202 is larger, the structural strength of the second thermal management part 202 can be improved, and when the ratio relation between the two satisfies 0.01mm ^-1 ≤D/A×1000≤5mm ^-1 The requirements of heat dissipation effect and structural strength can be considered. If (D/A × 1000) is less than 0.01mm ^-1 The surface area a of the cell unit 1 is sufficiently large, but the thermal management second portion 202 is too thin, so that the strength of the thermal management second portion 202 is insufficient, and the thermal management member 2 may have a problem of breakage or cracking during use, which may cause breakage of the cell unit 1. If (D/A × 1000) is greater than 5mm ^-1 The second part 202 of the thermal management piece 2 is thick enough, but the surface area a of the battery cell unit 1 is too small, the heat dissipation area of the battery cell unit 1 can be insufficient by the thermal management piece 2, and although the heat dissipation effect of the thermal management piece 2 itself is enough, the heat dissipation area is not enough, so that the heat of the battery cell unit 1 cannot be timely transferred to the thermal management piece 2, and the heat dissipation requirement of the battery cell unit 1 cannot be integrally met. Therefore, the dimension D of the thermal management second portion 202 and the surface area a of the cell unit 1 satisfy 0.01mm ^-1 ≤D/A×1000≤5mm ^-1 In time, the requirements of the strength and the heat management performance of the heat management part 2 can be simultaneously considered, and the comprehensive performance of the battery is guaranteed to a certain extent.

Further preferably, D is related to a by: 0.04mm ^-1 ≤D/A×1000≤2mm ^-1 . When the diameter is 0.04mm ^-1 ≤D/A×1000≤2mm ^-1 In the process, the size D of the second thermal management part 202 and the surface area a of the battery cell unit 1 are further balanced, the strength and the thermal management performance requirements of the thermal management piece 2 are effectively considered, and the performance of the battery is guaranteed to a certain extent.

Referring to fig. 5 and 7, in an alternative of the present embodiment, in the direction of the length extension of the thermal management first section 201 (i.e., the first direction), the wall thickness dimension B of the thermal management second section 202 is related to the dimension C of the thermal management second cooling cavity by: B/C is more than or equal to 0.01 and less than or equal to 30. For example, B/C is 0.01, 0.5, 2, 7, 10, 18, 20, 25, or 30, or other values.

In this embodiment, if the B/C is less than 0.01, the wall thickness dimension B of the thermal management second portion 202 (i.e., the wall thickness dimension of the thermal management second cooling cavity) is too thin, which results in insufficient strength of the thermal management second portion 202, failure to withstand cell expansion force, and easy breakage failure, and the requirement of vibration and impact of the battery during use cannot be met, even at the initial stage of battery module grouping, that is, the thermal management second portion 202 is crushed when a pre-tightening force is applied; if the B/C is greater than 30, the size C of the thermal management second cooling cavity is too small, that is, the width of the thermal management second cooling cavity along the first direction is too small, so that the flow resistance is gradually increased or even blocked when a cooling medium flows in the thermal management second cooling cavity, which causes a decrease in heat exchange effect, and meanwhile, the wall thickness of the thermal management second portion 202 is too thick, which causes too high structural strength of the thermal management second portion 202, and the battery cell cannot be timely deformed during expansion to make an expansion space required by the battery cell unit 1, which accelerates the capacity attenuation of the battery cell unit 1. Therefore, when the B/C ratio is more than or equal to 0.01 and less than or equal to 30, the cooling effect and the strength requirement can be considered at the same time, and the overall performance of the battery pack is guaranteed.

Further optionally, B and C are related by: B/C is more than or equal to 0.04 and less than or equal to 15. When B/C is more than or equal to 0.04 and less than or equal to 15, the wall thickness B of the thermal management second part 202 and the size C of the thermal management second cooling cavity are further balanced, the cooling effect and the strength requirement can be effectively considered, and the overall performance is guaranteed.

In an alternative of this embodiment, the first surface 101 of the cell unit 1 may be a top surface, a bottom surface, or a side surface of the cell unit 1.

As shown in fig. 1 to fig. 7, the first surface 101 of the cell unit 1 is a side surface of the cell unit 1, and the second surface 102 of the cell unit 1 is a large surface of the cell unit 1; thermal management spare 2 can cool off the side and the big face of electric core unit 1 simultaneously this moment, realizes the effective cooling to electric core unit 1, can play the structure supporting role as the structure to the battery module that electric core unit 1 constitutes simultaneously, can save beam structure.

As another alternative, the first surface 101 of the cell unit 1 is a top surface of the cell unit 1, and the second surface 102 of the cell unit 1 is a large surface of the cell unit 1; at this time, the thermal management member 2 may cool the top surface of the cell unit 1 while cooling the large surface of the cell unit 1. When the connecting sheet is connected to the top surface of the cell unit 1, the connecting sheet can be cooled, and heat generated when the connecting sheet overflows can be eliminated. Specifically, the connecting piece includes positive connecting piece and negative connecting piece, promptly the battery module still includes positive connecting piece and negative connecting piece.

Specifically, in the present embodiment, the first surface 101 of the cell unit 1 is provided with a positive electrode and a negative electrode; the positive electrodes of all the cell units 1 are electrically connected to the positive connecting members, and the negative electrodes of all the cell units 1 are electrically connected to the negative connecting members.

In a specific embodiment, the thermal management first portion 201 is located between the positive and negative connections, i.e., the thermal management first portion 201 does not cover the positive and negative connections; or in a more preferred embodiment, the positive connecting member, the first surface 101 of the electric core unit 1, and the negative connecting member are all connected to the thermal management first portion 201, that is, the thermal management first portion 201 covers the positive connecting member and the negative connecting member, so as to cool the positive connecting member and the negative connecting member, it should be noted that, at this time, the thermal management first portion 201 may be a structure having a certain curved surface, so as to implement the attachment with the positive connecting member, the negative connecting member, and the first surface 101, thereby improving the heat dissipation effect.

In an alternative of this embodiment, the flow direction of the cooling medium in the thermal management first portion 201 of the thermal management member 2 may be a unidirectional flow or a bidirectional flow, or a multidirectional flow, i.e. the flow direction of the cooling medium in the thermal management first cooling cavity may be a unidirectional flow or a bidirectional flow, or a multidirectional flow. Similarly, the flow direction of the cooling medium in the second thermal management cavity 202 of the thermal management element 2 may be unidirectional, bidirectional or multidirectional, that is, the flow direction of the cooling medium in the second thermal management cavity may be unidirectional, bidirectional or multidirectional. For example, the unidirectional flow is that the flow directions of cooling media in all flow channels are in the same direction; the bidirectional flow is that all flow channels are divided into two partial flow channels, and the flow directions of cooling media in the two partial flow channels are basically opposite; the multidirectional flow is that the flow channel is inclined in a three-dimensional space to cause the flow direction of liquid to be inclined, and the flow of cooling media in all the flow channels has a plurality of different directions.

As shown in fig. 1 to 5, in an alternative of the present embodiment, the number of the thermal management first sections 201 is multiple, and the multiple thermal management first sections 201 are sequentially arranged at intervals along the second direction; the thermal management first cooling cavities of the respective thermal management first sections 201 are in communication with each other. In an alternative of this embodiment, the thermal management first cooling cavity comprises a first cooling-in cavity and a first cooling-out cavity.

Each heat management second cooling cavity is communicated with the first cooling inlet cavity and the first cooling outlet cavity, namely the first cooling inlet cavity is used as a total inlet flow channel, the first cooling outlet cavity is used as a total outlet flow channel, at the moment, the heat management second cooling cavities are of a flow channel structure with openings at two ends, the heat management second cooling cavities in each heat management second part are respectively communicated with the total inlet flow channel and the total outlet flow channel, cooling media respectively enter the heat management second cooling cavities from the first cooling inlet cavity and then flow out of the first cooling outlet cavity to complete a complete cooling flow, and therefore the occupied volume of the heat management piece 2 can be fully utilized to realize quick and effective heat dissipation.

The first thermal management unit 201 is provided with a first connection nozzle 4 and a second connection nozzle 6, the first connection nozzle 4 is communicated with the first cooling inlet chamber, and the second connection nozzle 6 is communicated with the first cooling outlet chamber.

In an alternative embodiment, the first connection nozzle 4 and the second connection nozzle 6 are provided at the same end or at different ends of the thermal management first section 201; wherein the first connecting nozzle 4 is a connecting inlet and the second connecting nozzle 6 is a connecting outlet.

In this embodiment, the number of the first thermal management portions 201 is multiple, that is, the multiple first thermal management portions 201 are sequentially arranged at intervals along the second direction; the respective first connection nozzles 4 are communicated through the first connection pipe 3, and the respective second connection nozzles 6 are communicated through the second connection pipe 5. Through the first connecting pipe 3 and the second connecting pipe 5, the first connecting nozzles 4 of the first heat management units 201 are communicated, and the second connecting nozzles 6 of the first heat management units 201 are communicated, so that the whole cooling medium of the battery pack is distributed, and uniform heat dissipation is realized for the battery cell units 1 at various positions.

In an alternative of this embodiment, the number of the battery cell units is multiple; that is, a plurality of battery cells are connected between two adjacent thermal management second portions 202, so that the number of the thermal management second portions 202 can be reduced, and the energy density of the battery pack can be improved.

A plurality of electric core monomer connect gradually along the first direction, or a plurality of electric core monomer connect gradually along the second direction, or a plurality of electric core monomer are arranged along first direction and second direction.

In the optional scheme of the embodiment, a connecting rib partition is arranged in the heat management first cooling cavity and/or the heat management second cooling cavity; that is, it separates to be provided with the splice bar in first cooling chamber of thermal management or the thermal management second cooling intracavity, or the first cooling chamber of thermal management and the thermal management second cooling intracavity all are provided with the splice bar and separate. The connecting ribs can improve the strength of the first thermal management part 201 or the second thermal management part 202, and can guide the flow of the cooling medium in the first thermal management cavity or the second thermal management cavity.

In this embodiment, the connection modes of the first thermal management part 201 and the second thermal management part 202 with the battery cell unit 1 may be gluing, clamping, screwing, and the like.

In this embodiment, the first thermal management unit 201 and the second thermal management unit 202 may be directly connected to the battery cell unit 1, or may be connected to each other through an intermediate connection member.

In an alternative of this embodiment, the thermal management first part 201 and/or the thermal management second part 202 is connected to the cell unit 1 by gluing; that is, the first thermal management part 201 or the second thermal management part 202 is connected to the cell unit 1 by adhesive, or the first thermal management part 201 and the second thermal management part 202 are respectively connected to the cell unit 1 by adhesive, so that the thermal management member 2 can support the structure of the cell unit 1 while dissipating heat, and the structural strength and the energy density of the battery pack are improved.

In an alternative of this embodiment, the thermal management first part 201 and/or the thermal management second part 202 is connected to the cell unit 1 by a layer of thermally conductive elastomeric material. That is, the thermal management first section 201 or the thermal management second section 202 is connected to the cell unit 1 through a thermally conductive elastic material layer, or the thermal management first section 201 and the thermal management second section 202 are connected to the cell unit 1 through a thermally conductive elastic material layer, respectively. Through heat conduction elastic material layer, both can absorb the inflation that electric core unit 1 produced in the use, guarantee that the bulging force does not directly act on thermal management spare 2, can effectively laminate with electric core unit 1 curved surface when electric core unit 1 inflation again, guarantee the validity of thermal conduction face between thermal management spare 2 and the electric core unit 1.

In this embodiment, the battery cell unit 1 may adopt a square hard-shell battery cell, a soft-package battery cell, or other types of battery cells.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The battery pack is characterized by comprising a thermal management piece and a plurality of battery cell units, wherein each battery cell unit comprises at least one battery cell monomer; when the number of the battery cell units is multiple, the battery cell units are regularly stacked along one or more of a first direction, a second direction and a third direction, wherein the first direction, the second direction and the third direction are mutually perpendicular; the battery cell unit comprises a first surface and two second surfaces, and the two second surfaces are connected to the first surface and are oppositely arranged;

the thermal management piece comprises a thermal management first part and a plurality of thermal management second parts; the plurality of thermal management second parts are sequentially arranged on the same side surface of the thermal management first part at intervals along the length extension direction of the thermal management first part;

the battery cell unit is arranged between every two adjacent heat management second parts, the first surface is connected with the heat management first parts, and the two second surfaces are respectively connected with the adjacent heat management second parts; wherein the second surface is a largest surface of the cell unit;

a first heat management cooling cavity used for leading in a cooling medium is arranged in the first heat management part, and a second heat management cooling cavity used for leading in the cooling medium is arranged in the second heat management part; the thermal management first cooling cavity is in communication with the thermal management second cooling cavity.

2. The battery pack of claim 1, wherein the cell units are arranged in a matrix along a second direction and a length extension direction of the thermal management first portion, the thermal management first portion is located on one side of the cell units along the second direction, and the second direction intersects the length extension direction of the thermal management first portion.

3. The battery pack of claim 1, wherein, in the direction of the length extension of the thermal management first portion, the dimension D of the thermal management second portion is related to the dimension H of the cell unit by: D/H is more than or equal to 0.01 and less than or equal to 30.

4. The battery pack of claim 1, wherein the thermal management second portion has a dimension D and the second surface overlaps the thermal management second portion with a surface area a in a direction along the length of the thermal management first portion;

5. The battery pack of claim 1, wherein a wall thickness dimension B of the thermal management second portion in a direction of lengthwise extension of the thermal management first portion is related to a dimension C of the thermal management second cooling cavity by: B/C is more than or equal to 0.01 and less than or equal to 30.

6. The battery pack of claim 5, wherein B and C are in the relationship: B/C is more than or equal to 0.04 and less than or equal to 15.

7. The battery pack of any of claims 1-6, further comprising a positive connector and a negative connector opposite the first surface;

the first surface is provided with a positive electrode and a negative electrode which are electrically connected with the battery cell unit; the positive electrode is electrically connected with the positive connecting piece, and the negative electrode is electrically connected with the negative connecting piece;

8. The battery pack according to any one of claims 1 to 6, wherein the number of the thermal management first portions is plural, and the plural thermal management first portions are arranged at intervals in the second direction; wherein the second direction intersects a direction of length extension of the thermal management first portion; the thermal management first cooling cavities of each thermal management first section are in communication.

9. The battery pack of claim 8, wherein the thermal management first cooling cavity comprises a first cooling in cavity and a first cooling out cavity;

the first heat management part is provided with a first connecting pipe nozzle and a second connecting pipe nozzle, the first connecting pipe nozzle is communicated with the first cooling inlet cavity, and the second connecting pipe nozzle is communicated with the first cooling outlet cavity; the first connecting pipe mouths are communicated with each other, and the second connecting pipe mouths are communicated with each other.

10. The battery pack according to any one of claims 1 to 6, wherein the first thermal management part and/or the second thermal management part is/are connected to the cell unit by gluing;