CN209880740U - Secondary battery and battery module - Google Patents
Secondary battery and battery module Download PDFInfo
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- CN209880740U CN209880740U CN201920961384.1U CN201920961384U CN209880740U CN 209880740 U CN209880740 U CN 209880740U CN 201920961384 U CN201920961384 U CN 201920961384U CN 209880740 U CN209880740 U CN 209880740U
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model provides a secondary battery and battery module. The battery module includes a plurality of secondary batteries. The secondary battery includes an electrode assembly, a case, and a cap assembly. The housing has an accommodation chamber having an opening at one end in the height direction. The electrode assembly is accommodated in the accommodating chamber of the case, and the cap assembly is connected to the case and covers the opening of the case. The electrode assembly includes a first pole piece, a second pole piece, and a separator separating the first pole piece and the second pole piece. The electrode assembly is of a winding structure and is flat, and the electrode assembly comprises two flat surfaces which face each other along the height direction; alternatively, the electrode assembly is of a laminated structure, and the first pole piece, the separator, and the second pole piece are stacked in the height direction. The first pole piece comprises a first current collector and a first active substance layer coated on the surface of the first current collector, and the thickness of the first active substance layer is 150-250 micrometers.
Description
Technical Field
The utility model relates to a battery field especially relates to a secondary battery and battery module.
Background
A battery module generally includes a plurality of secondary batteries arranged in sequence, and an electrode assembly is provided inside each secondary battery. During charging and discharging, the electrode assembly expands, and expansion forces generated by the electrode assemblies of the plurality of secondary batteries are superposed along the arrangement direction to form an excessive resultant force; the resultant force presses the secondary battery, causing the secondary battery to fail to operate normally, affecting the life of the secondary battery.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the background art, it is an object of the present invention to provide a secondary battery and a battery module, which can reduce the expansion force of the secondary battery and improve the energy density.
In order to achieve the above object, the present invention provides a secondary battery and a battery module.
The secondary battery includes an electrode assembly, a case, and a cap assembly. The housing has an accommodation chamber having an opening at one end in the height direction. The electrode assembly is accommodated in the accommodating chamber of the case, and the cap assembly is connected to the case and covers the opening of the case. The electrode assembly includes a first pole piece, a second pole piece, and a separator separating the first pole piece and the second pole piece. The electrode assembly is of a winding structure and is flat, and the electrode assembly comprises two flat surfaces which face each other along the height direction; alternatively, the electrode assembly is of a laminated structure, and the first pole piece, the separator, and the second pole piece are stacked in the height direction. The first pole piece comprises a first current collector and a first active substance layer coated on the surface of the first current collector, and the thickness of the first active substance layer is 150-250 micrometers.
The first active material layer includes graphite or a silicon-based material.
The weight of the first active material layer is less than 0.22g/1540.25mm2。
In the length direction, both ends of the diaphragm exceed the first active material layer, and the size of each end of the diaphragm exceeding the first active material layer is 3mm-15 mm.
The diaphragm comprises a substrate and a liquid retention layer arranged on the surface of the substrate.
The electrode assembly is plural and stacked in the height direction. The sum of the sizes of the plurality of electrode assemblies in the height direction is T, the depth of the accommodating chamber is H, and the value of T/H is 0.85-0.95.
The cap assembly includes a cap plate and an insulating member disposed at a side of the cap plate adjacent to the electrode assembly. The secondary battery further includes a buffer member disposed at a side of the insulating member adjacent to the electrode assembly, the buffer member being porous and having elasticity.
The buffer member includes a main body portion located between the insulating member and the electrode assembly, and an extension portion extending from an end of the main body portion in the length direction toward a direction away from the insulating member, the extension portion being located outside the electrode assembly in the length direction.
The top cap assembly further includes an electrode terminal provided to the top cap plate and a current collecting member connecting the electrode terminal and the electrode assembly. The extension portion is located between the current collecting member and the electrode assembly in the length direction.
The battery module includes the secondary battery. The secondary batteries are arranged in a plurality of and in sequence, and the arrangement direction of the plurality of secondary batteries is perpendicular to the height direction.
The utility model has the advantages as follows: in the secondary battery of the present application, the expansion force of the electrode assembly in the height direction is the largest, and in the height direction, the expansion force of the electrode assembly to the case is smaller. In the battery module of the present application, the arrangement direction of the plurality of secondary batteries is perpendicular to the height direction, and therefore, even if the amounts of expansion of all the electrode assemblies in the arrangement direction are superposed together, an excessive resultant force is not generated, thereby preventing the secondary batteries from being crushed and ensuring the performance and the life of the secondary batteries. Meanwhile, the active material layer of the present application may have a large thickness to improve the energy density of the secondary battery.
Drawings
Fig. 1 is a schematic diagram of a battery module according to the present invention.
Fig. 2 is an exploded view of a secondary battery according to the present invention.
Fig. 3 is a sectional view of a secondary battery according to the present invention.
Fig. 4 is a schematic view of an electrode assembly of a secondary battery according to the present invention.
Fig. 5 is another schematic view of an electrode assembly of a secondary battery according to the present invention.
Wherein the reference numerals are as follows:
1 electrode Assembly
11 first pole piece
111 first current collector
112 first active material layer
12 second pole piece
121 second current collector
122 second active material layer
13 diaphragm
131 base material
132 liquid retaining layer
14 flat surface
15 narrow side
2 casing
21 accommodating chamber
3 Top cover assembly
31 ceiling board
32 insulating member
33 electrode terminal
34 current collecting component
4 buffer component
41 body part
42 extension part
5 end plate
6 binding belt
In the X longitudinal direction
Y width direction
Direction of Z height
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means more than two (including two); the term "coupled", unless otherwise specified or indicated, is to be construed broadly, e.g., "coupled" may be a fixed or removable connection or a connection that is either integral or electrical or signal; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Referring to fig. 1, the battery module of the present application includes secondary batteries, end plates 5, straps 6, and bus bars. The secondary battery is plural and arranged in sequence. The secondary battery of the present application may be a prismatic lithium ion battery. The arrangement direction of the plurality of secondary batteries may be parallel to the width direction Y of each secondary battery. The end plates 5 are two and are respectively arranged at two ends of the plurality of secondary batteries along the arrangement direction, and the cable ties 6 surround the end plates 5 and the outer sides of the plurality of secondary batteries and clamp the end plates 5 and the plurality of secondary batteries together. The bus bar connects the plurality of secondary batteries together in series, in parallel, or in series-parallel.
The battery module of the application can be applied to an electric automobile to be used as a power system of the electric automobile. When the battery module is mounted to an electric vehicle, the height direction Z of the secondary battery is substantially perpendicular to the horizontal plane. Wherein the height direction Z, the length direction X and the width direction Y of the secondary battery are perpendicular to each other.
The secondary battery of the present application is explained in detail below.
Referring to fig. 2 and 3, the secondary battery of the present application includes an electrode assembly 1, a case 2, and a cap assembly 3.
The electrode assembly 1 comprises a first pole piece 11, a second pole piece 12 and a separator 13, the separator 13 separating the first pole piece 11 and the second pole piece 12.
In one embodiment, the electrode assembly 1 is of a coiled construction, as shown in figure 4. Specifically, the first pole piece 11, the second pole piece 12, and the separator 13 are each a tape-shaped structure, the first pole piece 11, the separator 13, and the second pole piece 12 are sequentially laminated and wound two or more turns to form the electrode assembly 1, and the electrode assembly 1 is flat. Fig. 4 shows the outline of the electrode assembly 1, and the outer surface of the electrode assembly 1 includes two flat surfaces 14 and two narrow surfaces 15, the two flat surfaces 14 facing each other in the height direction Z, and the two narrow surfaces 15 facing each other in the width direction Y. Flat surface 14 is a surface having the largest area and substantially parallel to the winding axis of electrode assembly 1. The flat surface 14 may be a relatively flat surface and need not be a pure plane. The narrow face 15 is at least partially arcuate. The flat surface 14 is opposite to the narrow surface 15, and the area of the flat surface 14 is larger than that of the narrow surface 15.
In another embodiment, the electrode assembly 1 is of a laminated construction. Specifically, the electrode assembly 1 includes a plurality of first pole pieces 11 and a plurality of second pole pieces 12, and the separator 13 is disposed between the first pole pieces 11 and the second pole pieces 12. The first pole piece 11, the separator 13, and the second pole piece 12 are stacked in the height direction Z. In the laminated structure, the first pole piece 11 and the second pole piece 12 are both sheet-shaped and substantially perpendicular to the height direction Z.
Fig. 5 is a schematic view of the electrode assembly 1 of the present application, showing only one layer of the first pole piece 11, one layer of the separator 13, and one layer of the second pole piece 12, with the other layers of the first pole piece 11, the separator 13, and the second pole piece 12 omitted.
Referring to fig. 5, the first electrode sheet 11 includes a first current collector 111 and a first active material layer 112 coated on a surface of the first current collector 111. Wherein, the first active material layer 112 is coated on both surfaces of the first current collector 111 at the same time. One end of the first current collector 111 in the length direction X has a first empty region not coated with the first active material layer 112.
The second electrode sheet 12 includes a second current collector 121 and a second active material layer 122 coated on a surface of the second current collector 121. Wherein, the second active material layer 122 is coated on both surfaces of the second current collector 121 at the same time. One end of the second current collector 121 in the length direction X has a second empty region not coated with the second active material layer 122.
The case 2 is internally formed with a receiving chamber 21 to receive the electrode assembly 1 and the electrolyte. One end of the accommodation chamber 21 in the height direction Z has an opening, and the electrode assembly 1 can be placed into the case 2 through the opening. The housing 2 may be made of a material of a conductive metal such as aluminum or an aluminum alloy. The height direction Z is parallel to the extending direction of the accommodating chamber 21.
The top cap assembly 3 includes a top cap plate 31, an insulating member 32, an electrode terminal 33, and a current collecting member 34. The top cover plate 31 may be made of a metal material such as aluminum, aluminum alloy, or the like, and the size of the top cover plate 31 matches the size of the opening of the housing 2. The top cap plate 31 may be connected to the case 2 by welding and covers the opening of the case 2, thereby sealing the electrode assembly 1 within the receiving chamber 21 of the case 2.
The insulating member 32 is disposed on the inner side of the top cap plate 31, i.e., the side of the top cap plate 31 adjacent to the electrode assembly 1. The insulating member 32 separates the top cap plate 31 from the electrode assembly 1 to reduce the risk of short circuits.
The electrode terminal 33 is provided to the top cap plate 31 and protrudes outside the top cap plate 31. The electrode terminal 33 may be fixed to the top cover plate 31 by welding, caulking, or the like. The electrode terminal 33 and the current collecting member 34 are both two, one current collecting member 34 connects the first vacant region and one electrode terminal 33, and the other current collecting member 34 connects the second vacant region and the other electrode terminal 33. The first and second blank regions may be connected to the current collecting member 34 by ultrasonic welding.
During charging and discharging of the electrode assembly 1, the electrode sheet expands in the thickness direction thereof. In the wound electrode assembly 1, the expansion force in the direction perpendicular to the flat face 14 is the largest; in the laminated electrode assembly 1, the expansion force in the stacking direction of the first and second pole pieces 11 and 12 is the largest. It follows that the expansion force of the electrode assembly 1 in the height direction Z is greatest whether the electrode assembly 1 is of a wound type or a laminated type. That is, the expansion force of the electrode assembly 1 applied to the case 12 in the arrangement direction of the secondary batteries is small.
In the battery module of the present application, the arrangement direction of the plurality of secondary batteries is perpendicular to the height direction Z, and therefore, even if the amounts of expansion of all the electrode assemblies 1 in the arrangement direction are superposed together, excessive resultant force is not generated, thereby preventing the secondary batteries from being crushed and ensuring the performance and life of the secondary batteries.
In this application, the bulging force of battery module is lower, so this application can adopt less ribbon 6 of intensity to fix all secondary battery, need not worry that ribbon 6 breaks under the effect of bulging force. The ribbon 6 has a small volume and weight, and can effectively increase the energy density of the battery module.
In the conventional art, increasing the weight of the active material layers (i.e., the first active material layer 112 and the second active material layer 122) is the simplest method for increasing the energy density. However, when the weight of the active material layer increases, the thickness thereof also increases, and the amount of expansion during charge and discharge also increases. Meanwhile, the thicker active material layer is sensitive to the expansion force, and when the expansion force is large, the cyclic water jump of the electrode assembly 1 is easily caused.
In the battery module of the related art, the expansion force generated from the electrode assembly 1 is large, which is very disadvantageous in terms of cycle performance of a chemical system sensitive to the expansion force. Therefore, in the prior art, the thickness of the active material layer is usually only several tens of micrometers to reduce the risk of circulating water jump of the electrode assembly 1. That is, in the related art, the energy density of the secondary battery is low.
In the battery module of the present application, however, excessive resultant force is not generated even if the amounts of expansion of all the electrode assemblies 1 in the arrangement direction are added together. Therefore, the active material layer of the present application may have a large thickness to improve the energy density of the secondary battery.
Specifically, the thickness of the first active material layer 112 of the first pole piece 11 may be 150 μm to 250 μm. Here, referring to fig. 5, the thickness refers to a thickness of the first active material layer 112 located at one side of the first current collector 111.
The negative active material layer is relatively severely expanded during charge and discharge, and thus, in the related art, the negative active material layer generally has a small thickness. The battery module of the present application has a small swelling force, so that the negative active material layer can have a large thickness. Therefore, it is preferable that the first active material layer 112 is a negative-polarity active material layer including graphite or a silicon-based material. The first current collector 111 may be a copper foil.
Correspondingly, the second electrode plate 12 is a positive electrode plate, the second current collector 121 is an aluminum foil, and the second active material layer 122 includes a ternary material, lithium manganate or lithium iron phosphate.
The weight of the first active material layer 112 is less than 0.22g/1540.25mm2. It is to be added here that the weight here refers to the weight of the first active material layer 112 on the first current collector 111 side. When the thickness of the first active material layer 112 is constant, the greater the weight thereof and the greater the density, the greater the amount of expansion during use. If the weight of the first active material layer 112 is more than 0.22g/1540.25mm2This may result in a large expansion force, which may affect the performance of the electrode assembly 1.
The weight of the second active material layer 122 is less than 0.35g/1540.25mm2。
Referring to fig. 3, the electrode assembly 1 is plural and stacked in the height direction Z. During charging and discharging, expansion of each electrode assembly 1 occurs. In the present application, the plurality of electrode assemblies 1 in the secondary battery are arranged in the height direction Z, so the expansion forces of the plurality of electrode assemblies 1 are superimposed in the height direction Z. And the expansion of the plurality of electrode assemblies 1 is small in the width direction Y, so that, in the battery module, even if the expansion forces of all the electrode assemblies 1 in the width direction Y are added together, an excessive resultant force is not generated, thereby reducing the risk of crushing the secondary battery.
The sum of the dimensions of the plurality of electrode assemblies 1 in the height direction Z is T, the depth of the accommodation chamber 21 is H, and the value of T/H is 0.85 to 0.95.
During operation, the amount of expansion of the plurality of electrode assemblies 1 may be superimposed in the height direction Z, and when expanded to a certain extent, the expansion force of the plurality of electrode assemblies 1 may press the insulating member 32 and the top cap plate 31, causing the top cap plate 31 to be deformed, affecting the appearance and performance of the secondary battery. The larger the value of T/H, the smaller the distance between the electrode assembly 1 and the insulating member 32 in the height direction Z, and the larger the expansion force to which the top lid plate 31 is subjected. Therefore, it is preferable that the value of T/H is 0.95 or less to reserve a gap between the electrode assembly 1 and the insulating member 32, which can absorb the expansion of the electrode assembly 1 and reduce the deformation of the top cap plate 31.
Of course, the smaller the value of T/H, the smaller the thickness of the electrode assembly 1, and the lower the energy density of the secondary battery. Therefore, it is preferable that the value of T/H is 0.85 or more to secure the energy density of the secondary battery.
During the operation of the secondary battery, lithium ions in the second active material layer 122 need to be intercalated into the first active material layer 112; in order to allow lithium ions to be inserted into the first active material layer 112 as much as possible and reduce the risk of lithium deposition, both ends of the first active material layer 112 extend beyond the second active material layer 122 in the longitudinal direction X.
In order to avoid short-circuiting, separator 13 needs to completely separate first active material layer 112 and second active material layer 122. Therefore, referring to fig. 5, both ends of the separator 13 extend beyond the first active material layer 112 in the longitudinal direction X. The separator 13 may completely cover the first active material layer 112 in the thickness direction Z to reduce the risk of short circuit.
The portion of the separator 13 that exceeds the first active material layer 112 is not covered with the first active material layer 112, and this portion can absorb the electrolyte in the case 12 and transport the electrolyte to the inside of the electrode assembly 1, thereby improving the wettability of the electrode assembly 1. In order to improve the efficiency of the separator 13 in absorbing the electrolytic solution, it is preferable that each end of the separator 13 exceeds the size of the first active material layer 112 by 3mm or more. In addition, if the dimension of each end of the separator 13 beyond the first active material layer 112 is too large, it will cause the separator 13 to occupy too much space, lowering the energy density, and therefore, it is preferable that the dimension of each end of the separator 13 beyond the first active material layer 112 be 15mm or less.
The separator 13 includes a substrate 131 and a liquid retaining layer 132 provided on a surface of the substrate 131. The substrate 131 may be an organic material such as PP (polypropylene), PE (polyethylene), PET (poly terephthalic acid plastic), ethylene oxide, propylene oxide, polyethylene oxide, polyvinyl chloride, MEEP (polyphosphazene), PEG (polyethylene glycol), polymethyl methacrylate, polyacrylonitrile, polyethylene glycol dimethyl ether, polyvinylidene fluoride, styrene butadiene rubber, carboxymethyl cellulose, and polyethylene acid. The liquid retention layer 132 may be Al2O3A coating, an aramid coating, or a polydopamine layer. The liquid retention layer 132 can improve the liquid retention capability of the diaphragm 13 and improve wettability.
Referring to fig. 3, the secondary battery further includes a buffer member 4, the buffer member 4 being disposed on a side of the insulating member 32 adjacent to the electrode assembly 1, the buffer member 4 being porous and having elasticity. The buffer member 4 may limit shaking of the electrode assembly 1 and prevent tearing at the connection of the current collecting member 34 and the electrode assembly 1.
The buffer member 4 has a porous structure, and an electrolyte is adsorbed therein. When the electrode assembly 1 expands, the expansion force of the electrode assembly 1 acts on the cushioning member 4. The cushioning member 4 has elasticity, which can release the expansion force of the electrode assembly 1 by compression. At the same time, when the buffer member 4 is compressed, the electrolyte inside it flows out, thereby improving the wettability of the electrode assembly 1.
The cushioning member 4 includes a main body portion 41 and an extended portion 42, the main body portion 41 being located between the insulating member 32 and the electrode assembly 1, the extended portion 42 extending from an end of the main body portion 41 in the length direction X toward a direction away from the insulating member 32, and the extended portion 42 being located outside the electrode assembly 1 in the length direction X. The body portion 41 can restrict the electrode assembly 1 from wobbling in the height direction Z, and can release the expansion force of the electrode assembly 1 by compression. The extension portions 42 are two and located at both sides of the electrode assembly 1 in the length direction X, respectively.
In the secondary battery in which a plurality of electrode assemblies 1 are arranged in the height direction Z, it is difficult for the electrolyte at the bottom of the case 2 to directly enter the electrode assemblies 1 near the top cap plate 31. That is, the electrode assembly 1 having a lower wettability closer to the top lid plate 31 is likely to have a lithium deposition problem.
And the extension portion 42 of the buffer member 4 can absorb the electrolyte inside the case 2 and transmit the electrolyte at the bottom of the case 2 to the electrode assembly 1 near the top cap plate 31 by capillary action, thereby improving wettability. In addition, when the electrode assembly 1 compresses the body part 41, the electrolyte inside the body part 41 may be transferred to the electrode assembly 1 near the top cap plate 31 through the extension part 42. In short, the extension part 42 is arranged, so that the transmission path of the electrolyte is increased, the difference of the wettability of the electrode assemblies 1 is reduced, the wettability is improved, the risk of lithium precipitation is reduced, and the service life of the secondary battery is prolonged.
Preferably, the extension portion 42 is in direct contact with an end of the separator 13 in the length direction X, which may facilitate the separator 13 to directly absorb the electrolyte in the extension portion 42.
When the secondary battery vibrates, the electrode assembly 1 may shake in the length direction X, causing a risk of tearing at the connection of the current collecting member 34 and the electrode assembly 1. In the present application, the extension portion 42 is located between the current collecting member 34 and the electrode assembly 1 in the length direction X. The extension 42 may limit the relative displacement of the electrode assembly collecting member 34 and the electrode assembly 1, reduce the risk of tearing at the connection of the collecting member 34 and the electrode assembly 1, and improve the service life of the secondary battery.
Claims (10)
1. A secondary battery, characterized by comprising an electrode assembly (1), a case (2), and a cap assembly (3);
the housing (2) has an accommodation chamber (21), and one end of the accommodation chamber (21) in the height direction (Z) has an opening;
the electrode assembly (1) is accommodated in an accommodating chamber (21) of the shell (2), and the top cover assembly (3) is connected to the shell (2) and covers an opening of the shell (2);
the electrode assembly (1) comprises a first pole piece (11), a second pole piece (12) and a diaphragm (13), wherein the diaphragm (13) separates the first pole piece (11) from the second pole piece (12);
the electrode assembly (1) is of a winding structure and is flat, and the electrode assembly (1) comprises two flat surfaces (14), wherein the two flat surfaces (14) face each other along the height direction (Z); or the electrode assembly (1) is of a laminated structure, and the first pole piece (11), the diaphragm (13) and the second pole piece (12) are laminated along the height direction (Z);
the first pole piece (11) comprises a first current collector (111) and a first active material layer (112) coated on the surface of the first current collector (111), and the thickness of the first active material layer (112) is 150-250 microns.
2. The secondary battery according to claim 1, wherein the first active material layer (112) includes graphite or a silicon-based material.
3. The secondary battery according to claim 2, wherein the weight of the first active material layer (112) is less than 0.22g/1540.25mm2。
4. The secondary battery according to claim 2, wherein both ends of the separator (13) are beyond the first active material layer (112) in the longitudinal direction (X), and each end of the separator (13) is 3mm to 15mm beyond the first active material layer (112).
5. The secondary battery according to claim 4, wherein the separator (13) comprises a base material (131) and a liquid-retaining layer (132) provided on a surface of the base material (131).
6. The secondary battery according to claim 1,
a plurality of electrode assemblies (1) are stacked in the height direction (Z);
the sum of the dimensions of the plurality of electrode assemblies (1) in the height direction (Z) is T, the depth of the accommodation chamber (21) is H, and the value of T/H is 0.85-0.95.
7. The secondary battery according to claim 1,
the top cover assembly (3) comprises a top cover plate (31) and an insulating member (32), wherein the insulating member (32) is arranged on one side of the top cover plate (31) close to the electrode assembly (1);
the secondary battery further includes a buffer member (4), the buffer member (4) being disposed on a side of the insulating member (32) close to the electrode assembly (1), the buffer member (4) being porous and having elasticity.
8. The secondary battery according to claim 7,
the cushioning member (4) includes a main body portion (41) and an extension portion (42), the main body portion (41) is located between the insulating member (32) and the electrode assembly (1), the extension portion (42) extends from an end of the main body portion (41) in the length direction (X) toward a direction away from the insulating member (32), and the extension portion (42) is located outside the electrode assembly (1) in the length direction (X).
9. The secondary battery according to claim 8,
the top cover assembly (3) further comprises an electrode terminal (33) and a current collecting component (34), the electrode terminal (33) is arranged on the top cover plate (31), and the current collecting component (34) is connected with the electrode terminal (33) and the electrode assembly (1);
the extension portion (42) is located between the current collecting member (34) and the electrode assembly (1) in the length direction (X).
10. A battery module characterized by comprising the secondary battery according to any one of claims 1 to 9;
the secondary batteries are arranged in a plurality of and in sequence, and the arrangement direction of the plurality of secondary batteries is perpendicular to the height direction (Z).
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| CN201920961384.1U CN209880740U (en) | 2019-06-24 | 2019-06-24 | Secondary battery and battery module |
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| CN201920961384.1U CN209880740U (en) | 2019-06-24 | 2019-06-24 | Secondary battery and battery module |
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| WO2021164594A1 (en) * | 2020-02-21 | 2021-08-26 | 比亚迪股份有限公司 | Battery sequence, battery pack and vehicle |
| CN114586231A (en) * | 2021-06-29 | 2022-06-03 | 宁德新能源科技有限公司 | Battery and electric device with same |
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| CN117673672A (en) * | 2024-01-31 | 2024-03-08 | 江苏时代新能源科技有限公司 | Battery cell, battery and electricity utilization device |
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2019
- 2019-06-24 CN CN201920961384.1U patent/CN209880740U/en active Active
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| WO2021164594A1 (en) * | 2020-02-21 | 2021-08-26 | 比亚迪股份有限公司 | Battery sequence, battery pack and vehicle |
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| CN114586231A (en) * | 2021-06-29 | 2022-06-03 | 宁德新能源科技有限公司 | Battery and electric device with same |
| CN114586231B (en) * | 2021-06-29 | 2024-02-23 | 宁德新能源科技有限公司 | Battery and electricity utilization device with same |
| CN115395178A (en) * | 2022-09-22 | 2022-11-25 | 广州小鹏汽车科技有限公司 | Battery cell, battery and vehicle |
| CN117673672A (en) * | 2024-01-31 | 2024-03-08 | 江苏时代新能源科技有限公司 | Battery cell, battery and electricity utilization device |
| CN117673672B (en) * | 2024-01-31 | 2024-05-31 | 江苏时代新能源科技有限公司 | Battery cell, battery and electricity utilization device |
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