CN119092907B - Battery and battery pack - Google Patents
Battery and battery pack Download PDFInfo
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- CN119092907B CN119092907B CN202411588371.6A CN202411588371A CN119092907B CN 119092907 B CN119092907 B CN 119092907B CN 202411588371 A CN202411588371 A CN 202411588371A CN 119092907 B CN119092907 B CN 119092907B
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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
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
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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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
本发明涉及电池技术领域，公开了电池及电池包，包括：外壳，形成有容纳空间；极组，设置于所述容纳空间内，并沿y方向排列设置有至少两个，所述极组包括连接设置的主体部和极耳，所述主体部具有沿x‑z方向的接触面；隔热结构，贴合设置于相邻所述极组之间，所述隔热结构覆盖所述接触面设置。本发明通过在相邻极组之间设置隔热结构，避免相邻极组贴合而导致热量在贴合面处造成热量叠加，并且使隔热结构覆盖主体部的接触面设置，保证隔热效果，因此，解决了极组温度容易急剧增加的问题，提高了电池的安全性能。
The present invention relates to the field of battery technology, and discloses a battery and a battery pack, including: a housing, which is formed with a storage space; a pole group, which is arranged in the storage space and has at least two pole groups arranged along the y direction, the pole group includes a main body and a pole ear connected and arranged, and the main body has a contact surface along the x-z direction; a heat insulation structure, which is arranged between adjacent pole groups, and the heat insulation structure covers the contact surface. The present invention arranges a heat insulation structure between adjacent pole groups to avoid heat superposition at the bonding surface caused by the bonding of adjacent pole groups, and the heat insulation structure covers the contact surface of the main body to ensure the heat insulation effect, thereby solving the problem that the pole group temperature is prone to increase sharply and improving the safety performance of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery and a battery pack.
Background
Batteries, such as lithium ion batteries, sodium ion batteries, solid-state batteries, and the like, have the outstanding advantages of high energy density, good cycle performance, and the like, and are widely applied to the fields of portable electronic equipment, electric vehicles, electric tools, unmanned aerial vehicles, energy storage equipment, and the like. The internal electrode group of the battery can generate a large amount of heat in a long-time working state due to internal resistance, heat superposition is formed between the joint surfaces of the adjacent electrode groups, so that the temperature rise of the electrode groups is increased sharply, and the heat accumulation easily causes the safety problem of the battery.
Disclosure of Invention
In view of the above, the present invention provides a battery and a battery pack, so as to solve the problem that the battery safety performance is reduced due to the rapid increase of the temperature rise of the battery in the prior art.
The invention provides a battery, which comprises a shell, a pole group, a heat insulation structure, a laminated pole group and a winding type pole group, wherein an accommodating space is formed in the shell, the pole group is arranged in the accommodating space and is provided with at least two pole groups in an arrayed mode along the y direction, the pole group comprises a main body part and pole lugs which are connected and arranged, the main body part is provided with a contact surface along the x-z direction, the heat insulation structure is arranged between the adjacent pole groups in a fitting mode, the heat insulation structure covers the contact surface, the pole group is a laminated pole group and comprises a negative pole piece which is arranged in a laminated mode, the length of the negative pole piece along the x direction is a, the inner length of the shell is b, the length of the heat insulation structure is c, the length of the pole group is (a+0.5) mm is less than or equal to c (b-0.5) mm, or the length of the pole group is winding type pole group, the length of the pole group along the x direction is p, the inner length of the shell is b, the thickness of the pole group is q along the y direction, and the thickness of the pole group is (p-q+1.5) c-0.5 mm is less than or equal to c.
The heat insulation structure has the advantages that the heat insulation structure is arranged between the adjacent pole groups, heat superposition caused by the fact that the adjacent pole groups are attached to each other is avoided, the heat insulation structure is arranged to cover the contact surface of the main body part, and the heat insulation effect is guaranteed, so that the problem that the temperature of the pole groups is easy to increase sharply is solved, the safety performance of the battery is improved, and the damage of the heat insulation structure to the pole groups is avoided, and meanwhile the pole groups and the heat insulation structure can be ensured to be smoothly put into the shell.
In an alternative embodiment, the shell comprises a enclosing structure, a first sealing structure and a second sealing structure, wherein the two ends of the enclosing structure are provided with openings, the first sealing structure is connected with the enclosing structure and seals one opening, the second sealing structure is connected with the enclosing structure and seals the other opening, the enclosing structure, the first sealing structure and the second sealing structure enclose to form the accommodating space, the first sealing structure and the second sealing structure are connected with the enclosing structure through welding, or the first sealing structure is connected with the enclosing structure through welding, and the second sealing structure is integrally arranged with the enclosing structure.
In an alternative embodiment, the first sealing structure comprises a cover plate body and an insulating piece, the cover plate body is connected with the enclosing structure, one surface of the insulating piece is attached to one surface of the cover plate body, which faces the accommodating space, the other surface of the insulating piece is abutted to the main body, the thickness of the first sealing structure along the z direction is f, the thickness of the cover plate body is j, and the thickness of the insulating piece is k, so that f=j+k is satisfied.
In an alternative embodiment, the second sealing structure comprises a sealing plate and a bottom supporting plate, the sealing plate is connected with the enclosing structure, one surface of the bottom supporting plate is attached to one surface of the sealing plate facing the accommodating space, the other surface of the bottom supporting plate faces the pole group, the thickness of the second sealing structure along the z direction is g, the thickness of the sealing plate is l, the thickness of the bottom supporting plate is m, and the conditions of g=l+m are met.
In an alternative embodiment, in the outer surface of the integral structure formed by all the electrode groups and the heat insulation structure, at least one surface facing the second closed structure is covered with an insulating film, and the insulating film is attached to the bottom support plate, wherein the electrode groups comprise negative electrode plates, the height of the negative electrode plates corresponding to the main body parts along the z direction is d, the height of the shell is e, the thickness of the insulating film is h, the height of the heat insulation structure is i, and the (d+0.5) mm is less than or equal to i less than or equal to (e-f-g-h-0.5) mm.
The heat insulation structure has the beneficial effects that the first closed structure and/or the second closed structure and the enclosing structure are/is assembled smoothly while the damage to the pole group caused by the heat insulation structure is avoided.
In an alternative embodiment, the thickness of the insulating structure in the y-direction is n, satisfying 0.05 mm.ltoreq.n.ltoreq.3 mm.
The heat insulation structure has the beneficial effects that the influence on the energy density of the battery caused by overlarge occupation of the internal space of the battery is avoided while the heat insulation effect is ensured.
In an alternative embodiment, the insulating structure is a mica board, or a silicone rubber board, or a ceramic silicone rubber board.
In a second aspect, the invention also provides a battery pack comprising the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a battery according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along the direction A-A in FIG. 1;
FIG. 3 is a schematic view of a laminated pole set according to an embodiment of the present invention;
FIG. 4 is a schematic view of a projection of a negative plate, a heat insulation structure and a housing space of a housing of a laminated pole group in an x-z plane;
FIG. 5 is a schematic view of a coiled pole set according to an embodiment of the present invention;
FIG. 6 is a top view of a coiled pole set mated with an insulation structure according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken in the direction B-B of FIG. 1;
Fig. 8 is a partial schematic structure of one of the portions of the battery shown in fig. 7;
Fig. 9 is a partial schematic structure of another portion of the battery shown in fig. 7.
Reference numerals illustrate:
1. the solar battery comprises a shell, 11 enclosing structures, 111, a first enclosing plate, 112, a second enclosing plate, 12, a first enclosing structure, 121, a cover plate body, 122, an insulating piece, 13, a second enclosing structure, 131, a sealing plate, 132, a bottom supporting plate, 2, a pole group, 21, a main body part, 211, a negative pole piece, 212, a straight section, 213, a bending section, 22, a pole lug, 3, a heat insulation structure and 4, an insulating film.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An embodiment of the present invention is described below with reference to fig. 1 to 9.
According to an embodiment of the present invention, in one aspect, there is provided a battery including a case 1, a pole group 2, and a heat insulation structure 3. The housing 1 is formed with an accommodation space in which the pole group 2 is disposed, and at least two are disposed in a row in the y direction. The pole group 2 includes a body 21 and a tab 22 connected to each other, and the body 21 has a contact surface in the x-z direction. The heat insulation structure 3 is arranged between the adjacent pole groups 2 in a fitting way, and the heat insulation structure 3 is arranged to cover the contact surface.
The battery of this embodiment through setting up thermal-insulated structure 3 between adjacent utmost point group 2, avoids adjacent utmost point group 2 laminating and leads to the heat to cause the heat to overlap in the faying face department to make thermal-insulated structure 3 cover the contact surface setting of main part 21, guarantee thermal-insulated effect, consequently, solved the problem that extremely group 2 temperature is easy sharply increased, improved the security performance of battery.
Specifically, as shown in fig. 7, two pole groups 2 are arranged along the y direction, at this time, one heat insulation structure 3 is arranged, the heat insulation structure 3 is arranged between the two pole groups 2, one side surface of the heat insulation structure 3 is attached to the contact surface of one of the pole groups 2, and the other side surface of the heat insulation structure 3 is attached to the contact surface of the other pole group 2.
Of course, in other alternative embodiments, the pole group 2 may also be provided with more, for example three, four, etc. It will be appreciated that as the number of pole groups 2 increases, so too does the number of insulating structures 3, for example when the pole groups 2 are provided with three, and then the insulating structures 3 are provided with two.
In the first embodiment, as shown in fig. 3 and 4, the electrode group is a laminated electrode group including the negative electrode sheets 211 laminated. Along the x direction, the length of the negative electrode plate 211 is a, the inner length of the shell 1 is b, and the length of the heat insulation structure 3 is c, so that the length of (a+0.5) mm is less than or equal to c is less than or equal to (b-0.5) mm. So set up, when avoiding thermal-insulated structure 3 to cause the damage to utmost point group 2, ensure that utmost point group 2 and thermal-insulated structure 3 can go into the shell smoothly.
It should be noted that, if the value of c is too small, the coverage of the electrode set 2 is too small, which results in poor heat insulation effect, and the edges of the heat insulation structure 3 (the left and right edges shown in fig. 4) fall within the range of the negative electrode sheet 211, which causes the edges of the heat insulation structure 3 to apply a shearing force to the electrode set 2 during the use of the battery, which easily causes damage to the electrode set 2 and even causes the lithium precipitation phenomenon of the battery. If the value of c is too large, interference with part of the housing 1 is likely to occur when the pole group 2 and the heat insulation structure 3 are assembled into the housing, and the assembly efficiency is affected.
It should be noted that the laminated pole group further includes a positive pole piece and a separator, the negative pole piece 211 and the positive pole piece are alternately laminated in sequence, and the separator is stacked between the adjacent positive pole piece and negative pole piece 211.
In a second embodiment, as shown in fig. 5 and 6, the pole group is a wound pole group. Along the x direction, the length of the pole group is p, the inner length of the shell is b, the length of the heat insulation structure is c, and along the y direction, the thickness of the pole group is q, so that the thickness of the pole group is (p-q+1.5) mm and is less than or equal to c and less than or equal to (b-0.5) mm. So set up, when avoiding thermal-insulated structure 3 to cause the damage to utmost point group 2, ensure that utmost point group 2 and thermal-insulated structure 3 can go into the shell smoothly.
It should be noted that, if the value of c is too small, the coverage of the electrode set 2 is too small, which results in poor heat insulation effect, and the edges of the heat insulation structure 3 (the left and right edges shown in fig. 6) fall within the range of the negative electrode sheet 211, which causes the edges of the heat insulation structure 3 to apply a shearing force to the electrode set 2 during the use of the battery, which easily causes damage to the electrode set 2 and even causes the lithium precipitation phenomenon of the battery. If the value of c is too large, interference with part of the housing 1 is likely to occur when the pole group 2 and the heat insulation structure 3 are assembled into the housing, and the assembly efficiency is affected.
It is to be noted that, for the wound electrode group, the positive electrode sheet, the separator, and the negative electrode sheet 211, which are stacked, are formed by winding, and as shown in fig. 5, the main body portion 21 includes a flat section 212 and curved sections 213 connected to opposite sides of the flat section 212. Referring to fig. 6, if the value of c is (p-q) mm < c < (p-q+1.5) mm, the distance that the heat insulation structure extends out of the straight section is too small, and the edge of the heat insulation structure is easy to contact with the curved section due to a certain thickness of the heat insulation structure, the edge of the heat insulation structure 3 applies a shearing force to the curved section, which is easy to damage the pole group 2 and even cause the lithium precipitation phenomenon of the battery.
Specifically, in one embodiment, as shown in fig. 1,2 and 7, the housing 1 includes a enclosing structure 11, a first enclosing structure 12 and a second enclosing structure 13. The two ends of the enclosing structure 11 are provided with openings, the first enclosing structure 12 is connected with the enclosing structure 11 to block one opening, the second enclosing structure 13 is connected with the enclosing structure 11 to block the other opening, and the enclosing structure 11, the first enclosing structure 12 and the second enclosing structure 13 enclose to form an accommodating space. The first sealing structure and the second sealing structure are connected with the enclosing structure through welding, or the first sealing structure is connected with the enclosing structure through welding, and the second sealing structure and the enclosing structure are integrally arranged.
Further, as shown in fig. 2 and 7, the enclosure structure 11 includes a first enclosing plate 111 and a second enclosing plate 112, where the first enclosing plate 111 and the second enclosing plate 112 are both provided with two, as shown in fig. 2, two first enclosing plates 111 are disposed at opposite intervals along the x direction, as shown in fig. 7, and two second enclosing plates 112 are disposed at opposite intervals along the y direction. The two first coamings 111 and the two second coamings 112 are sequentially connected in the circumferential direction, so that two openings are formed by surrounding two ends of the two first coamings 111 and the two second coamings 112 in the z direction.
Therefore, referring to fig. 2, the inner length of the housing 1 is the inner length of the enclosing structure 11, that is, the distance between two opposite sides of the two first enclosing plates 111. Further, if the value of c is too large, the heat insulating structure 3 is liable to interfere with the first enclosure 111 when the pole group 2 and the heat insulating structure 3 are assembled into the case (i.e., assembled into the enclosure 11 through the opening).
Specifically, in one embodiment, as shown in fig. 8, the first sealing structure 12 includes a cover body 121 and an insulating member 122, where the cover body 121 is connected to the enclosing structure 11, one surface of the insulating member 122 is attached to one surface of the cover body 121 facing the accommodating space, and the other surface of the insulating member 122 is abutted to the main body 21, and in the z direction, the thickness of the first sealing structure 12 is f, the thickness of the cover body 121 is j, and the thickness of the insulating member 122 is k, so that f=j+k is satisfied.
It should be noted that, referring to fig. 8, the first closing structure 12 is inserted into the enclosing structure 11 from the upper end opening of the enclosing structure 11, the upper surface of the cover plate body 121 is flush with the upper end surface of the enclosing structure 11, the upper surface of the insulating member 122 is attached to the lower surface of the cover plate body 121, and the lower surface of the insulating member 122 is attached to the upper surface of the main body 21.
Specifically, in one embodiment, as shown in fig. 9, the second sealing structure 13 includes a sealing plate 131 and a bottom support plate 132, the sealing plate 131 is connected with the enclosing structure 11, one surface of the bottom support plate 132 is attached to one surface of the sealing plate 131 facing the accommodating space, the other surface of the bottom support plate 132 is arranged facing the pole group 2, the thickness of the second sealing structure 13 is g, the thickness of the sealing plate 131 is l, and the thickness of the bottom support plate 132 is m along the z direction, so as to satisfy g=l+m.
It should be noted that, referring to fig. 9, the sealing plate 131 is connected to the lower end surface of the enclosing structure 11, and the bottom supporting plate 132 is disposed on the upper surface of the sealing plate 131. Further, the enclosing structure 11 is integrally provided with the sealing plate 131.
Therefore, in the present embodiment, the sealing plate 131 and the enclosing structure 11 are integrally formed during the actual machining process, so that the sealing plate 131 can close an opening at one end of the enclosing structure 11 during the machining process, and the opening formed at the other end opposite to the sealing plate 131 is used as the mounting opening of the pole group 2 (i.e. the pole group 2 is mounted into the accommodating space through the mounting opening), and the mounting opening is further sealed by the cover plate body 121. As an alternative embodiment, in the actual processing, the enclosing structure 11 may be formed by processing alone, that is, the enclosing structure 11 with two open ends is formed by processing first, and in the battery assembling process, the two open ends are blocked by the first sealing structure 12 and the second sealing structure 13.
Of course, in other alternative embodiments, the second closure structure 13 may also be arranged similarly to the first closure structure 12, i.e. even if the second closure structure 13 comprises a cover plate body 121 and an insulating member 122.
In one embodiment, as shown in fig. 9, an insulating film 4 is covered on at least one surface facing the second sealing structure 13 of the outer surface of the integral structure formed by all the electrode groups 2 and the heat insulation structure 3, and the insulating film 4 is attached to the bottom support plate 132, and as shown in fig. 4 to 9, the electrode groups comprise negative electrode plates 211, the height of the negative electrode plates 211 corresponding to the main body part along the z direction is d, the height of the shell 1 is e, the thickness of the first sealing structure 12 is f, the thickness of the second sealing structure 13 is g, the thickness of the insulating film 4 is h, the height of the heat insulation structure 3 is i, and the thickness of (d+0.5) mm is less than or equal to i (e-f-g-h-0.5) mm. By the arrangement, the first closed structure 12 and/or the second closed structure 13 and the enclosing structure 11 are/is assembled smoothly while the damage to the pole group 2 caused by the heat insulation structure 3 is avoided.
It should be noted that, if the value of i is too small, the coverage of the electrode set 2 is too small, which results in poor heat insulation effect, and the edge of the heat insulation structure 3 (the upper edge shown in fig. 4) falls within the range of the negative electrode sheet 211, which causes the edge of the heat insulation structure 3 to apply a shearing force to the electrode set 2 during the use of the battery, which easily causes damage to the electrode set 2 and even causes the lithium precipitation phenomenon of the battery. If i is excessively large, the first closing structure 12 and/or the second closing structure 13 are likely to interfere with the heat insulating structure 3 when being assembled to the enclosing structure 11, and the assembly efficiency is affected.
It can be understood that the negative electrode tab 211 corresponding to the main body is the remainder of the negative electrode tab 211 after the tab is removed.
It should be noted that, in some embodiments, a post is disposed on the first sealing structure 12 and/or the second sealing structure 13, and the post is used for electrically connecting with the tab 22 to draw out the electric quantity of the main body 21. In the present embodiment, the height e of the housing 1, the thickness f of the first closing structure 12, and the thickness g of the second closing structure 13 do not include the thickness of the pole in the z direction.
In this embodiment, referring to FIGS. 7 to 9, the height i of the heat insulating structure 3 satisfies (d+0.5) mm.ltoreq.i.ltoreq.e-j-k-l-m-h-0.5 mm.
In one embodiment, as shown in FIG. 7, the thickness of the insulating structure 3 in the y-direction is n, satisfying 0.05 mm.ltoreq.n.ltoreq.3 mm. So set up, when guaranteeing thermal-insulated effect, avoid occupying too big and influence battery energy density to battery inner space.
It should be noted that, if the value of n is too small, the heat insulation effect of the heat insulation structure 3 is poor, and heat is still easy to gather between the adjacent pole groups 2, so that the temperature rise of the battery is aggravated. If the value of n is too large, the occupied space of the heat insulation structure 3 in the battery is too large, so that the space utilization rate of the battery is reduced, and the energy density of the battery is affected.
In one embodiment, the insulating structure 3 is a mica board, or a silicone rubber board, or a ceramic silicone rubber board. Of course, the heat insulation structure 3 may be made of other materials capable of realizing heat insulation.
The following temperature detection and thermal runaway test were performed on the battery not provided with the heat insulating structure 3 and the battery provided with the heat insulating structure 3 of different thickness, and the test results of the example battery and the comparative example battery are shown in table 1. The example battery is a battery provided with the heat insulating structure 3, and the comparative example battery is a battery not provided with the heat insulating structure 3.
The temperature detection means that the intermediate temperature of the two electrode groups 2 is detected during normal battery charging, and the detection result in table 1 is the maximum value of the detected temperature. Specifically, for the battery without the heat insulation structure 3, a temperature sensor is arranged at the middle position of the two pole groups 2, and for the battery with the heat insulation structure 3, the temperature sensor is preset at the middle position inside the heat insulation structure 3.
Table 1 test results of example battery and comparative example battery
As can be seen from table 1, the batteries of comparative example 1 were not provided with the heat insulating structure 3 (i.e., the thickness of the heat insulating structure 3 was 0), the middle temperature of the two electrode group 2 was higher, the batteries of examples 1 to 12 were provided with the heat insulating structure 3, the middle temperature of the two electrode group 2 was lower than the batteries of comparative example 1, and in the batteries of examples 1 to 12, the middle temperature of the two electrode group 2 was also lower as the thickness of the heat insulating structure 3 was increased. Meanwhile, as can also be seen from table 1, the triggering time for triggering thermal runaway of the batteries of examples 1 to 12 was prolonged as compared with the batteries of comparative example 1, and in the batteries of examples 1 to 12, the prolonged time for triggering thermal runaway was increased as the thickness of the heat insulation structure 3 was increased.
The following observations were made on the assembly process and the disassembled condition of the case, the laminated pole group and the heat insulation structure, and the observations of the example battery and the comparative example battery are shown in table 2. The example battery refers to a battery in which the dimensions of the casing, the pole group and the heat insulation structure meet the requirements of the example, and the comparative example battery refers to a battery in which the dimensions of the casing, the pole group or the heat insulation structure do not meet the requirements of the example.
Table 2 example battery and comparative example battery observations
It was calculated that 100.5 mm.ltoreq.c.ltoreq.104.5 mm,100.5 mm.ltoreq.i.ltoreq.104.5 mm was satisfied for the batteries in examples 13 to 18. As can be seen from table 2, in examples 13 to 18, the values of c and i all meet the above requirements, so that the batteries of examples 13 to 18 can be assembled normally during the assembly process, the electrode group 2 can be put into the case normally, and the lithium precipitation problem does not occur in the electrode sheet after the disassembly of the battery.
It was calculated that 80.5 mm.ltoreq.c.ltoreq.84.5 mm,60.5 mm.ltoreq.i.ltoreq.64.5 mm was satisfied for the battery of example 19. As can be seen from table 2, in example 19, the values of c and i both satisfy the above requirements, so that the battery of example 19 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 200.5 mm.ltoreq.c.ltoreq.204.5 mm,200.5 mm.ltoreq.i.ltoreq.204.5 mm was satisfied for the battery of example 20. As can be seen from table 2, in example 20, the values of c and i all meet the above requirements, so that the battery of example 20 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 300.5 mm.ltoreq.c.ltoreq.304.5 mm,300.5 mm.ltoreq.i.ltoreq.304.5 mm was satisfied for the battery of example 21. As can be seen from table 2, in example 21, the values of c and i all meet the above requirements, so that the battery of example 21 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 600.5 mm.ltoreq.c.ltoreq.604.5 mm,120.5 mm.ltoreq.i.ltoreq.124.5 mm was satisfied for the battery of example 22. As can be seen from table 2, in example 22, the values of c and i all meet the above requirements, so that the battery of example 22 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 100.5 mm.ltoreq.c.ltoreq.104.5 mm,100.5 mm.ltoreq.i.ltoreq.104.5 mm was satisfied for the batteries in comparative examples 2 to 5.
As can be seen from table 2, in comparative example 2, c=98 mm, does not meet the above requirement, and c <100.5mm, resulting in the edge of the insulating structure 3 exerting a shearing force on the pole group 2, causing the problem of lithium precipitation of the pole pieces.
As can be seen from table 2, in comparative example 3, i=98 mm, does not meet the above requirement, and i <100.5mm, resulting in the edge of the insulating structure 3 applying a shearing force to the pole group 2, causing the problem of lithium precipitation of the pole pieces.
As can be seen from table 2, in comparative example 4, c=105 mm, the above requirement is not satisfied, and c >104.5mm, resulting in interference of the heat insulating structure 3 with the case 1, and the battery is not normally assembled.
As can be seen from table 2, in comparative example 5, i=105 mm, the above requirement is not satisfied, and i >104.5mm, resulting in interference of the heat insulating structure 3 with the case 1, and the battery is not normally assembled.
The following observations were made on the assembly process and the disassembly of the case, the wound pole group, and the heat insulation structure, and the results of the observations of the example battery and the comparative example battery are shown in table 3. The example battery refers to a battery in which the dimensions of the casing, the pole group and the heat insulation structure meet the requirements of the example, and the comparative example battery refers to a battery in which the dimensions of the casing, the pole group or the heat insulation structure do not meet the requirements of the example.
Table 3 example battery and comparative example battery observations
It was calculated that 181.5 mm.ltoreq.c.ltoreq.204.5 mm,80.5 mm.ltoreq.i.ltoreq.84.5 mm were satisfied for the batteries in examples 23 to 28. As can be seen from table 3, in examples 23 to 28, the values of c and i all meet the above requirements, so that the batteries of examples 23 to 28 can be assembled normally during the assembly process, the electrode group 2 can be put into the case normally, and the lithium precipitation problem does not occur in the electrode sheet after the disassembly of the battery.
It was calculated that 291.5 mm.ltoreq.c.ltoreq.304.5 mm,60.5 mm.ltoreq.i.ltoreq.64.5 mm was satisfied for the battery of example 29. As can be seen from table 3, in example 29, the values of c and i all meet the above requirements, so that the battery of example 29 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 91.5 mm.ltoreq.c.ltoreq.154.5 mm,200.5 mm.ltoreq.i.ltoreq.204.5 mm was satisfied for the battery of example 30. As can be seen from table 3, in example 30, the values of c and i all meet the above requirements, so that the battery of example 30 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 61.5 mm.ltoreq.c.ltoreq.84.5 mm,300.5 mm.ltoreq.i.ltoreq.304.5 mm was satisfied for the battery of example 31. As can be seen from table 3, in example 31, the values of c and i all meet the above requirements, so that the battery of example 31 can be assembled normally during the assembly process, the pole group 2 can be put into the casing normally, and the pole piece does not have a problem of lithium precipitation after the battery is disassembled.
It was calculated that 181.5 mm.ltoreq.c.ltoreq.204.5 mm,80.5 mm.ltoreq.i.ltoreq.84.5 mm were satisfied for the cells in comparative examples 6 to 9.
As can be seen from table 3, in comparative example 6, c=178 mm, does not meet the above requirement, and c <181.5mm, resulting in the edge of the insulating structure 3 exerting a shearing force on the pole group 2, causing the problem of lithium precipitation of the pole pieces.
As can be seen from table 3, in comparative example 7, i=78 mm, does not meet the above requirement, and i <80.5mm, resulting in the edge of the insulating structure 3 exerting a shearing force on the pole group 2, causing the problem of lithium precipitation of the pole pieces.
As can be seen from table 3, in comparative example 8, c=205 mm, the above requirement is not satisfied, and c >204.5mm, resulting in interference of the heat insulating structure 3 with the case 1, and the battery is not normally assembled.
As can be seen from table 3, in comparative example 9, i=88 mm, the above requirement is not satisfied, and i >84.5mm, resulting in interference of the heat insulating structure 3 with the case 1, and the battery is not normally assembled.
According to an embodiment of the present invention, in another aspect, there is also provided a battery pack including the above battery.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
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