CN118431613A - A secondary battery, a battery pack and an energy storage box - Google Patents
A secondary battery, a battery pack and an energy storage box Download PDFInfo
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- CN118431613A CN118431613A CN202410538314.0A CN202410538314A CN118431613A CN 118431613 A CN118431613 A CN 118431613A CN 202410538314 A CN202410538314 A CN 202410538314A CN 118431613 A CN118431613 A CN 118431613A
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- secondary battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
本申请实施例提供的一种二次电池、电池包和储能箱，其中，二次电池包括壳体、导热件和至少一个裸电芯，裸电芯设置在壳体的容纳腔，第一导热件具有相互连接的第一导热部和第二导热部，沿二次电池的长度和/或宽度方向，第一导热部位于裸电芯的一侧，沿二次电池的高度方向，第二导热部位于裸电芯朝向壳体底壁的一侧。通过这样的设计能够提高导热效率，便于对二次电池进行散热，从而降低二次电池出现局部温度过高的情况，有利于提升二次电池的工作稳定性以及安全性。
The embodiments of the present application provide a secondary battery, a battery pack and an energy storage box, wherein the secondary battery includes a shell, a heat conductive member and at least one bare battery cell, the bare battery cell is arranged in the housing cavity of the shell, the first heat conductive member has a first heat conductive part and a second heat conductive part connected to each other, along the length and/or width direction of the secondary battery, the first heat conductive part is located on one side of the bare battery cell, along the height direction of the secondary battery, the second heat conductive part is located on the side of the bare battery cell facing the bottom wall of the shell. Such a design can improve the thermal conductivity efficiency, facilitate the heat dissipation of the secondary battery, thereby reducing the situation where the local temperature of the secondary battery is too high, which is conducive to improving the working stability and safety of the secondary battery.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a secondary battery, a battery pack and an energy storage box.
Background
Secondary batteries are rechargeable batteries that are reusable, have reversibility, and can be used continuously by charging after the battery is discharged, and typically include a housing, a cell assembly, and a cap assembly that encapsulates the cell assembly, the cell assembly including one or more bare cells. The secondary battery can generate heat in the use process, and the working efficiency of the secondary battery can be influenced along with the accumulation of the heat and potential safety hazards exist.
Disclosure of Invention
The embodiment of the application provides a secondary battery, a battery pack and an energy storage box, which are used for improving the heat dissipation efficiency of the secondary battery.
The present application provides a secondary battery including:
a housing having a receiving cavity;
At least one bare cell, the bare cell is positioned in the accommodating cavity;
the heat conduction piece comprises a first heat conduction piece, and the first heat conduction piece is positioned between the bare cell and the inner wall of the shell;
the first heat conduction piece comprises a first heat conduction part and a second heat conduction part which are connected with each other, the first heat conduction part is positioned at one side of the bare cell facing the side wall of the shell, and the second heat conduction part is positioned at one side of the bare cell facing the bottom wall of the shell.
In one possible embodiment, the area of the side of the bare cell is a along the width direction of the secondary battery, the area of the side of the bare cell is b along the length direction of the secondary battery, and a > b, and the first heat conduction part is located at one side of the bare cell along the width direction of the secondary battery.
In one possible embodiment, the first heat conducting member includes at least two first heat conducting portions, the first heat conducting portions being disposed in sequence along a width direction of the secondary battery, and the bare cell being located between adjacent first heat conducting portions.
In one possible implementation manner, the first heat conducting member includes at least three first heat conducting portions, the secondary battery includes at least two bare cells, and the first heat conducting portions are disposed on opposite sides of each of the bare cells along an arrangement direction of the bare cells.
In one possible implementation manner, the secondary battery includes at least two bare cells, the bare cells are sequentially arranged along the width direction of the secondary battery, and the projection of each bare cell is located in the projection range of the same second heat conduction part along the height direction of the secondary battery.
In one possible implementation manner, the heat conducting piece comprises at least one second heat conducting piece, the second heat conducting piece comprises a third heat conducting part and a fourth heat conducting part which are connected with each other, an included angle is formed between the third heat conducting part and the fourth heat conducting part, and the bare cell comprises a winding structure and a tab which are connected with each other;
The third heat conduction part is connected with the electrode lug, the third heat conduction part is positioned between the electrode lug and the winding structure, and the fourth heat conduction part is positioned between the bare cell and the inner wall of the shell.
In one possible embodiment, the third heat conducting portion is connected to the first heat conducting portion, and/or the second heat conducting portion is connected to at least one of the first heat conducting portion and the second heat conducting portion.
In one possible embodiment, the heat-conducting member includes at least two second heat-conducting members, and each of the bare cells includes a positive tab and a negative tab, which are connected to the corresponding second heat-conducting members, respectively.
In one possible embodiment, the first heat conducting portion has a thickness of 0.1 to 4mm, the second heat conducting portion has a thickness of 0.1 to 4mm, the third heat conducting portion has a thickness of 0.05 to 2mm, and the fourth heat conducting portion has a thickness of 0.1 to 4mm.
In one possible embodiment, the heat conducting member comprises at least one heat conducting layer.
In one possible embodiment, the heat conducting layer is a capillary layer, and/or the heat conducting layer is at least one of a graphite layer, a copper layer, and an aluminum layer.
The application also provides a battery pack, which comprises at least one battery module, wherein the battery module comprises at least one secondary battery;
Wherein the secondary battery is any one of the above secondary batteries.
The application also provides an energy storage box, which comprises an inverter, a battery management system and at least one battery pack, wherein the battery pack is the battery pack.
The application provides a secondary battery, a battery pack and an energy storage box, wherein the secondary battery comprises a shell, a heat conducting piece and at least one bare cell, the bare cell is arranged in a containing cavity of the shell, the first heat conducting piece is provided with a first heat conducting part and a second heat conducting part which are connected with each other, the first heat conducting part is positioned at one side of the bare cell along the length direction and/or the width direction of the secondary battery, and the second heat conducting part is positioned at one side of the bare cell facing to the bottom wall of the shell along the height direction of the secondary battery. Through the design, the heat conduction efficiency can be improved, and the secondary battery can be conveniently cooled, so that the situation that the local temperature of the secondary battery is too high is reduced, and the working stability and the safety of the secondary battery are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a secondary battery provided by the present application;
Fig. 2 is a sectional view of a first embodiment of a secondary battery provided by the present application;
Fig. 3 is a sectional view of a second embodiment of the secondary battery provided by the present application;
Fig. 4 is a schematic view of a second embodiment of a secondary battery provided by the present application;
fig. 5 is a schematic diagram of a bare cell and a first heat conductive member provided by the present application;
Fig. 6 is a schematic diagram of another embodiment of a bare cell and a first heat conductive member provided by the present application;
fig. 7 is a schematic view of a first embodiment of a heat conducting member according to the present application;
Fig. 8 is a schematic view of a second embodiment of a heat conducting member according to the present application;
fig. 9 is a schematic view of a third embodiment of a heat conducting member according to the present application;
fig. 10 is a schematic view of a fourth embodiment of a heat conducting member according to the present application;
Fig. 11 is a schematic view of a fifth embodiment of a heat conducting member according to the present application;
FIG. 12 is a schematic view of a battery pack according to the present application;
Fig. 13 is an exploded view of a battery pack according to the present application;
Fig. 14 is a schematic view of an energy storage tank according to the present application.
Reference numerals
1-A housing;
11-a receiving cavity;
111-sidewalls;
112-a bottom wall;
2-bare cell;
21-electrode lugs;
211-positive electrode lugs;
212-negative electrode ear;
22-winding structure;
3-a heat conducting member;
31-a first heat conducting member;
311-a first heat conduction part;
312-a second heat conduction part;
32-a second heat conductive member;
321-a third heat conduction part;
322-fourth heat conduction part;
4-a top cap assembly;
41-pole;
5-battery pack;
51-a battery module;
and 6-an energy storage box.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
As shown in fig. 1 and 2, an embodiment of the present application provides a secondary battery, the secondary battery including a case 1, a heat conductive member 3, and at least one bare cell 2, the case 1 having a side wall 111 and a bottom wall 112, the side wall 111 and the bottom wall 112 being connected and configured to enclose a receiving chamber 11, the bare cell 2 being disposed in the receiving chamber 11, the heat conductive member 3 including a first heat conductive member 31, the first heat conductive member 31 including a first heat conductive portion 311 and a second heat conductive portion 312, the first heat conductive portion 311 and the second heat conductive portion 312 being connected and having an included angle. The first heat conductive part 311 is located at a side of the bare cell 2 facing in the length and/or width direction of the secondary battery, and the second heat conductive part 312 is located at a side of the bare cell 2 facing the bottom wall 112 in the height direction of the secondary battery.
By adding the heat conducting member 3 to the secondary battery, heat generated when the secondary battery is operated can be transferred, so that accumulation of heat in the secondary battery is reduced, and the temperature of the secondary battery is increased, thereby affecting the normal operation of the secondary battery. The heat of the side can be transferred to the bottom of the secondary battery by providing the heat conductive member 3. In general, the amount of heat generated at the position of the post 41 of the secondary battery is large, and the post 41 is generally located at the top of the secondary battery, and therefore, the amount of heat generated at the bottom of the secondary battery is generally small, and the temperature is low. By providing the heat conductive member 3, heat generated from the secondary battery can be conducted to the bottom of the secondary battery, thereby making the overall temperature of the secondary battery more uniform, and thus contributing to improvement of the operation stability of the secondary battery.
Typically, a plurality of secondary batteries may be electrically connected to form the battery module 51, and the battery module 51 may be applied to the battery pack 5. The battery pack 5 may include a heat exchanging member such as a liquid cooling plate, which is generally located at the bottom of the battery module 51, and the bottom of the secondary battery and the bottom of the battery module 51 are located at the same side, so that heat exchange between the secondary battery and the heat exchanging member can be facilitated by transferring heat generated from the secondary battery to the bottom of the secondary battery, thereby cooling the secondary battery through the heat exchanging member and improving heat exchanging efficiency.
The first heat conductive portion 311 may be located at one side of the bare cell 2, may be located at one side of the bare cell 2 in the width direction of the secondary battery, may be located at one side of the bare cell 2 in the length direction of the secondary battery, and may be provided at the same time in the width direction and the length direction of the secondary battery. The setting can be specifically performed according to the heating condition of the bare cell 2. In one possible embodiment, the first heat conductive member 31 may include one first heat conductive portion 311 and one second heat conductive portion 312, i.e., the first heat conductive member 31 may have an "L" shape.
The heat dissipation efficiency of the secondary battery can be improved by providing at least one side of the bare cell 2, and when the first heat conductive part 311 is located at one side of the bare cell 2 in the width direction of the secondary battery, the heat dissipation efficiency of the secondary battery can be improved by 2% to 4%. When the first heat conductive part 311 is located at one side of the secondary battery in the opposite direction along the length of the secondary battery, the heat dissipation efficiency of the secondary battery may be improved by 3% to 5%. When the secondary battery includes a plurality of bare cells 2, the first heat conductive part 311 is disposed between adjacent bare cells 2, the heat dissipation efficiency of the secondary battery may be improved by 3% to 6%.
In one possible embodiment, the area of one side of the bare cell 2 is a in the width direction of the secondary battery, the area of one side of the secondary battery is b in the length direction of the secondary battery, and a > b. The first heat conductive part 311 is located at one side of the bare cell 2 in the width direction of the secondary battery.
Through such design, the first heat conducting part 311 can be located at one side with larger area of the bare cell 2, so that the contact area between the first heat conducting part 311 and the bare cell 2 can be increased, and the heat conducting efficiency is improved, so that the first heat conducting piece 31 can transfer heat to the bottom of the secondary battery more quickly.
In one possible embodiment, the first heat conductive part 311 may cover the entire surface of the bare cell 2 on one side in the width direction of the secondary battery.
When the bare cell 2 is a winding cell, the surfaces of the two sides of the bare cell 2 are planes along the width direction of the secondary battery, the surfaces of the two sides of the bare cell 2 are arc surfaces along the length direction of the secondary battery, compared with the planes, the size of the arc surfaces is relatively smaller, and the difficulty of attaching the first heat conducting piece 31 to the arc surfaces is relatively larger, so that the processing difficulty of the first heat conducting piece 31 can be reduced and the heat conducting efficiency can be improved by arranging the second heat conducting part 312 on one side of the plane of the bare cell 2.
In one possible embodiment, the first heat conductive part 311 is located at one side of the bare cell 2 in the length direction of the secondary battery.
According to actual measurement, the heat productivity of the arc-shaped section of the bare cell 2 is relatively higher compared with that of the planar position of the bare cell 2, and the first heat conduction part 311 can be arranged on the side where the arc-shaped surface of the bare cell 2 is located by arranging the first heat conduction part 311 on the side where the length direction of the secondary battery is located, so that the heat dissipation can be carried out on the area with larger heat productivity of the bare cell 2, and the possibility that the secondary battery has overhigh local temperature due to heat accumulation is reduced.
In one possible embodiment, the secondary battery may include at least two bare cells 2, and the number of the bare cells 2 may be two, three, four, or more. When the secondary battery includes a plurality of bare cells 2, the first heat conductive part 311 may be disposed between adjacent bare cells 2.
According to practical measurement, when the secondary battery comprises a plurality of bare cells 2, the heating value between the adjacent bare cells 2 is relatively large, and heat can be timely transferred to the bottom of the secondary battery through arranging the first heat conducting part 311 between the bare cells 2 in a new forest, so that the possibility that heat is accumulated between the adjacent bare cells 2 can be reduced, the temperature of the secondary battery can be more balanced, the working stability and safety of the secondary battery can be improved, and the practical use requirements can be met.
As shown in fig. 2, in one possible embodiment, the first heat conductive member 31 includes at least two first heat conductive portions 311, and the first heat conductive portions 311 are disposed on one side in the width direction of the secondary battery, with the bare cell 2 being located between the adjacent first heat conductive portions 311.
Through such design can make the relative both sides of naked electric core 2 all be provided with first heat conduction portion 311 to can increase the area of contact of first heat conduction spare 31 and naked electric core 2, be favorable to promoting the heat conduction efficiency of first heat conduction spare 31, be convenient for dispel the heat to the secondary cell, reduce the secondary cell and appear local high temperature, influence the possibility of secondary cell normal work. The safety of the secondary battery is improved.
As shown in fig. 3 and 4, in one possible embodiment, the first heat conductive member 31 includes at least three first heat conductive parts 311, and the secondary battery includes at least two bare cells 2. Each bare cell 2 is sequentially arranged along the width direction of the secondary battery, the opposite sides of each bare cell 2 are provided with first heat conduction parts 311, and one side, close to each other, of each adjacent bare cell 2 can share the same first heat conduction part 311.
The first heat conduction parts 311 are arranged between the adjacent bare cells 2, so that the total contact area of the first heat conduction piece 31 and the bare cells 2 can be further increased, the heat conduction efficiency between the first heat conduction piece 31 and the bare cells 2 can be improved, the heat dissipation capacity is improved, and the working stability of the secondary battery is improved.
Through the design, the first heat conducting piece 31 can better cover the bare cell 2, and the first heat conducting parts 311 are arranged on the two opposite sides of the bare cell 2, and the heat between the adjacent bare cells 2 can be conducted out more quickly by increasing the number of the first heat conducting parts 311 due to the relatively large heat productivity between the adjacent bare cells 2, so that the heat dissipation efficiency of the secondary battery can be improved.
As shown in fig. 2, 3 and 5, in one possible embodiment, the secondary battery includes at least two bare cells 2, each of the bare cells 2 is disposed in sequence along the width direction of the secondary battery, and the projection of each of the bare cells 2 is located within the projection range of the same second heat conductive portion 312 along the height direction of the secondary battery.
Through the design, the bare cells 2 can share the same second heat conduction part 312 to conduct heat transfer, and the utilization rate of the second heat conduction part 312 is improved. The first heat conductive member 31 may have a "U" -shaped structure, a "mountain" -shaped structure, or the like, and is attached to the surface of the bare cell 2. The sharing of the same second heat conduction part 312 at the bottom reduces the number of first heat conduction members 31, and one first heat conduction member 31 may be provided inside when the secondary battery is assembled. The method is beneficial to reducing the cost and the processing difficulty and improving the production efficiency.
In one possible embodiment, the heat conductive member 3 may replace a mylar (My ar) film in the secondary battery. In general, the maillard film is coated on the outer side of the bare cell 2, so as to reduce the possibility of scratching the bare cell 2 when the bare cell is put into the shell 1, and meanwhile, the maillard film can also play an insulating role, so that the safety of the secondary battery is improved. In the scheme provided by the embodiment of the application, the heat conducting piece 3 is arranged on the outer side of the bare cell 2, so that the bare cell 2 can be coated by the heat conducting piece 3, and the Mylar film can be replaced. The heat conducting member 3 protects and insulates the bare cell 2 and improves the heat dissipation efficiency of the secondary battery, so that the working stability of the secondary battery can be improved, and the practical use requirement can be met.
As shown in fig. 6, in one possible embodiment, the first heat conductive member 31 may include a plurality of first heat conductive parts 311, and the first heat conductive parts 311 are provided at opposite sides of the bare cell 2 in both the length direction and the width direction of the secondary battery.
Through such design can promote the cladding effect of heat conduction spare 3 to naked electric core 2, can be better conduct the heat. Compared with the scheme without the heat conducting member 3 arranged inside the secondary battery, the heat dissipation efficiency of the secondary battery can be improved by 3% to 7% by the scheme shown in fig. 6, so that the condition that the temperature of the bare cell 2 is too high in the working process of the secondary battery is reduced, and the working stability and the safety of the secondary battery are improved.
As shown in fig. 7, in one possible embodiment, the heat conducting member 3 includes at least one second heat conducting member 32, and the second heat conducting member 32 includes a third heat conducting portion 321 and a fourth heat conducting portion 322 connected to each other, with an included angle between the third heat conducting portion 321 and the fourth heat conducting portion 322. The bare cell 2 includes a winding structure 22 and a tab 21, which are connected to each other, the winding structure 22 may be formed by winding a positive electrode sheet, a negative electrode sheet and a separator, and chemical energy is converted into electricity through chemical reaction, and the tab 21 is electrically connected to a post 41 of the top cap assembly 4 of the secondary battery. The third heat conduction part 321 is connected with the tab 21 and is located between the tab 21 and the winding structure 22, and the fourth heat conduction part 322 is located between the bare cell 2 and the inner wall of the housing 1.
In general, the secondary battery has a larger amount of heat generated at the position of the tab 41 and the tab 21 than at other positions, and is likely to have an excessively high temperature. Through setting up the second heat-conducting piece 32 that is connected with utmost point ear 21, can in time carry out the heat that produces in utmost point ear 21 department and pass to, make the heat keep away from the utmost point ear 21 and the vicinity of utmost point post 41 to be favorable to alleviating the position problem of generating heat of utmost point ear 21 and utmost point post 41 place. The third heat conducting portion 321 is located between the tab 21 and the winding structure 22, that is, the third heat conducting portion 321 is located at a side of the tab 21 away from the pole 41. By connecting the third connection portion to the side of the tab 21 away from the post 41, it is possible to reduce the influence of the second heat conductive member 32 on the connection between the tab 21 and the post 41 while having a heat conductive effect.
As shown in fig. 8,9, 10, and 11, in one possible embodiment, the third heat conducting portion 321 may be connected to the first heat conducting portion 311, and/or the second heat conducting portion 312 may be connected to at least one of the first heat conducting portion 311 and the second heat conducting portion 312, that is, the second heat conducting portion 312 may be connected to the first heat conducting portion 311, or may be connected to the second heat conducting portion 312, or may be connected to both the first heat conducting portion 311 and the second heat conducting portion 312.
Through such design can make first heat conduction spare 31 and second heat conduction spare 32 form an organic whole structure, is favorable to increasing the area of heat conduction spare 3 to can increase the area of contact of heat conduction spare 3 and naked electric core 2, and be favorable to promoting heat conduction efficiency and the heat conduction effect of heat conduction spare 3.
As shown in fig. 11, in one possible embodiment, the fourth heat conductive part 322 may extend to the bottom of the secondary battery and be connected to the second heat conductive part 312.
Through such design, the heat generated by the positions of the lugs 21 and the poles 41 can be transferred to the second heat conduction part 312 at the bottom of the secondary battery through the second heat conduction part 32, so that the heat exchange between the heat exchange part of the battery pack 5 and the secondary battery can be conveniently carried out, the heat conduction efficiency is improved, the safety of the secondary battery is improved, and the practical use requirement is more met.
As shown in fig. 11, in one possible embodiment, the first thermally conductive section 311 and the second thermally conductive section 312 may be located on different sides of the bare cell 2.
By the design, heat can be conducted in different directions, so that the situation that the local temperature of the secondary battery is too high is reduced.
As shown in fig. 7, in one possible embodiment, the heat conducting member 3 includes at least two second heat conducting members 32, and each bare cell 2 includes one positive electrode tab 211 and one negative electrode tab 212, and the positive electrode tab 211 and the negative electrode tab 212 are connected to the corresponding second heat conducting members 32, respectively. The two second heat conducting members 32 may be respectively used as the second heat conducting member 32 of the positive electrode and the second heat conducting member 32 of the negative electrode, and such a design may conduct heat to the positive electrode tab 211 and the negative electrode tab 212, respectively, and in one possible embodiment, the two second heat conducting members 32 are not directly connected, i.e., one of the second heat conducting members 32 is not in direct contact with the third heat conducting portion 321 and the fourth heat conducting portion 322 of the other second heat conducting member 32. Such a design can be used to reduce the possibility of short circuit caused by the electrical connection of the positive electrode tab 211 and the negative electrode tab 212 through the second heat conductive member 32, which is advantageous for improving the safety of the secondary battery.
In one possible embodiment, the thickness of the first heat conductive part 311 may be 0.1 to 4mm, the thickness of the second heat conductive part 312 may be 0.1 to 4mm, the thickness of the third heat conductive part 321 may be 0.05 to 2mm, and the thickness of the fourth heat conductive part 322 may be 0.1 to 4 mm.
The thicknesses of the first, second, and third heat conductive portions 311, 312, and 321 may be 0.1, 0.4, 0.7, 1.0, 1.3, 1.6, 1.9, 2.2, 2.5, 2.8, 3.1, 3.4, 3.7, 4.0, etc. The thickness of the third heat conductive portion 321 is 0.05 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, and the like. The thicknesses of the first heat conductive part 311, the second heat conductive part 312, and the fourth heat conductive part 322 may be the same or different, and the specific thicknesses of the first heat conductive part 311, the second heat conductive part 312, the third heat conductive part 321, and the fourth heat conductive part 322 may be designed according to the internal space of the secondary battery to improve the heat dissipation efficiency of the secondary battery while also reducing the influence of the heat conductive member 3 on the capacity of the secondary battery.
In one possible embodiment, the heat conducting member 3 includes a heat conducting layer, and the heat conducting member 3 may have a single-layer structure or a multi-layer structure, and the number of the heat conducting layers may be one, two, three, four, five, or more. When the number of the heat conductive layers exceeds one, the heat conductive layers are stacked in the thickness direction of the heat conductive member 3.
By the mode, the heat conducting pieces 3 with different thicknesses can be designed according to the internal space of the secondary battery, so that the heat conducting effect of the heat conducting pieces 3 is improved, the occupation of the internal space of the secondary battery is reduced, the structure of the secondary battery is more compact, and the influence on the capacity of the secondary battery is reduced.
In one possible embodiment, the thermally conductive layer may be a graphite layer, a copper layer, an aluminum layer, etc., and/or the thermally conductive layer may be a wicking layer. The heat conducting layer can be made of graphite, copper, aluminum and other materials with high heat conducting efficiency, and can also be made of capillary structures for heat transfer. The graphite layer, the copper layer and the aluminum layer are convenient to manufacture, and the capillary layer can take away heat by adding the heat exchange medium and utilizing the phase change of the heat exchange medium, so that the heat dissipation efficiency is high.
When the heat conducting piece 3 comprises a plurality of heat conducting layers, the materials of the heat conducting layers can be the same or different, and the heat conducting layers can be matched by adopting different materials through the inner layer and the outer layer, so that the heat conducting piece 3 has higher heat conducting efficiency while insulating.
The capillary layer dissipates heat by utilizing the phase change of the heat exchange medium, is beneficial to the heat exchange medium to dissipate heat by converting between liquid and gas, and enables the heat exchange medium to circulate. The capillary layer can be relatively even to giving off all around with the heat, and when the local temperature of naked electric core 2 was too high, the heat transfer medium of the regional heat absorption evaporation that the capillary layer corresponds this position can be faster, and the heat transfer medium of other positions can flow to this region to dispel the heat, is favorable to reducing the possibility that the local temperature of naked electric core 2 appears too high. The metal layer has a high heat conductivity coefficient, for example, a copper layer has a heat conductivity coefficient of 386W/mK to 401W/mK, and the heat generated by the bare cell 2 can be absorbed and transferred quickly because copper has a good heat conductivity.
In one possible embodiment, the heat conducting member 3 may have a multi-layer structure, the heat conducting layer located at the middle position may be made of a material with higher heat conductivity, such as copper and aluminum, and the heat conducting layer made of an insulating material is disposed on the outer side of the copper and aluminum heat conducting layer, so that the heat conducting member 3 has better heat conducting capability and simultaneously has an insulating effect, thereby reducing the possibility of occurrence of faults, such as short circuits, inside the secondary battery due to the arrangement of the heat conducting member 3 inside the secondary battery, and being beneficial to improving the safety of the secondary battery.
Based on the secondary batteries according to the above embodiments, as shown in fig. 12, the embodiment of the present application further provides a battery pack 5, where, as shown in fig. 13, the battery pack 5 includes at least one battery module 51, and the battery module 51 includes at least one secondary battery according to any of the above embodiments, and when the battery module 51 includes a plurality of secondary batteries, each secondary battery may be electrically connected through a tab, and the tab may be electrically connected with the post 41 of the secondary battery by welding or the like. Since the secondary battery has the above technical effects, the battery pack 5 including the secondary battery also has corresponding technical effects, and a detailed description thereof will be omitted herein.
Typically, the battery pack 5 further includes a heat exchanging member, and the secondary battery is located above the heat exchanging member in the height direction of the battery pack 5. In the scheme provided by the embodiment of the application, the heat conducting piece 3 is integrated in the secondary battery, so that the heat generated by the secondary battery during operation can be conveniently transferred to the bottom of the secondary battery, and the heat exchange between the heat exchanging piece and the secondary battery is facilitated. Through the heat transfer to the secondary cell bottom with the secondary cell, can promote the heat conduction efficiency between secondary cell and the heat exchange piece to be favorable to promoting the radiating efficiency of battery package 5, can reduce the battery package 5 in the course of the work, the possibility that the condition of secondary cell temperature is too high appears, thereby be favorable to promoting the job stabilization nature of secondary cell, and security.
In general, the heat exchange member is disposed at the bottom of the battery pack 5, and the post 41 of the secondary battery is located at a side of the secondary battery away from the bottom of the battery pack 5, and the heat productivity of the secondary battery near the post 41 is relatively high during the operation process, and the heat generated by the post 41 cannot be dissipated in time only by disposing the heat exchange member at the bottom of the battery pack 5, which easily results in the increase of the post 41 and the surrounding temperature of the secondary battery, and further results in the occurrence of the situation that the local temperature of the secondary battery is too high, thereby affecting the safety of the battery pack 5. According to the embodiment of the application, the first heat conducting piece 31 and the second heat conducting piece 32 are arranged, so that heat generated by the secondary battery can be timely transferred to the bottom, namely, the direction close to the heat exchanging piece, and the second heat conducting piece 32 can be used for transferring heat generated by the pole 41 and the pole lug 21 to the direction close to the heat exchanging piece, thereby reducing the situation that the secondary battery has local overhigh temperature and being beneficial to improving the safety of the battery pack 5.
As shown in fig. 14, the embodiment of the present application further provides an energy storage tank 6, the energy storage tank 6 including an inverter, a battery management system, and at least one battery pack 5. The inverter is used for converting direct current into alternating current, and meanwhile, the inverter also has the advantages of higher conversion efficiency, higher starting speed, higher safety and the like, and can also have the functions of interval short circuit, overload, over/under voltage, overtemperature protection and the like. The battery management system is used for enabling the battery pack 5 to work in a safe working interval, and can control the charge and discharge power and the like of the battery pack 5 according to the factors such as the ambient temperature, the battery state and the electricity consumption requirement, so that the safety of the battery pack 5 is improved, the working state of the battery pack 5 is more reasonable, and the battery pack 5 is improved in duration and service life.
The embodiment of the application provides a secondary battery, a battery pack 5 and an energy storage box 6, wherein the secondary battery comprises a shell 1, a heat conducting piece 3 and at least one bare cell 2, the bare cell 2 is arranged in a containing cavity 11 of the shell 1, the first heat conducting piece 31 is provided with a first heat conducting part 311 and a second heat conducting part 312 which are connected with each other, the first heat conducting part 311 is positioned at one side of the bare cell 2 along the length direction and/or the width direction of the secondary battery, and the second heat conducting part 312 is positioned at one side of the bare cell 2 facing the bottom wall 112 of the shell 1 along the height direction of the secondary battery. Through the design, the heat conduction efficiency can be improved, and the secondary battery can be conveniently cooled, so that the situation that the local temperature of the secondary battery is too high is reduced, and the working stability and the safety of the secondary battery are improved.
The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for the device embodiment and the terminal embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and reference should be made to the description in the method embodiment for relevant points.
Claims (13)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410538314.0A CN118431613A (en) | 2024-04-30 | 2024-04-30 | A secondary battery, a battery pack and an energy storage box |
| US18/943,761 US20250070324A1 (en) | 2024-04-30 | 2024-11-11 | Secondary battery, battery pack, and energy storage cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410538314.0A CN118431613A (en) | 2024-04-30 | 2024-04-30 | A secondary battery, a battery pack and an energy storage box |
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| CN118431613A true CN118431613A (en) | 2024-08-02 |
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| CN202410538314.0A Pending CN118431613A (en) | 2024-04-30 | 2024-04-30 | A secondary battery, a battery pack and an energy storage box |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2026060674A1 (en) * | 2024-09-20 | 2026-03-26 | 宁德时代新能源科技股份有限公司 | Battery cell, battery apparatus and electrical apparatus |
| WO2026060678A1 (en) * | 2024-09-20 | 2026-03-26 | 宁德时代新能源科技股份有限公司 | Battery cell, battery apparatus and electrical apparatus |
| WO2026065415A1 (en) * | 2024-09-30 | 2026-04-02 | 宁德时代新能源科技股份有限公司 | Battery cell, related apparatuses, energy storage system, and charging network |
-
2024
- 2024-04-30 CN CN202410538314.0A patent/CN118431613A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2026060674A1 (en) * | 2024-09-20 | 2026-03-26 | 宁德时代新能源科技股份有限公司 | Battery cell, battery apparatus and electrical apparatus |
| WO2026060678A1 (en) * | 2024-09-20 | 2026-03-26 | 宁德时代新能源科技股份有限公司 | Battery cell, battery apparatus and electrical apparatus |
| WO2026065415A1 (en) * | 2024-09-30 | 2026-04-02 | 宁德时代新能源科技股份有限公司 | Battery cell, related apparatuses, energy storage system, and charging network |
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