CN116799415B - Battery pack and electric equipment - Google Patents
Battery pack and electric equipment Download PDFInfo
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- CN116799415B CN116799415B CN202311042136.4A CN202311042136A CN116799415B CN 116799415 B CN116799415 B CN 116799415B CN 202311042136 A CN202311042136 A CN 202311042136A CN 116799415 B CN116799415 B CN 116799415B
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- battery pack
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- 239000007788 liquid Substances 0.000 claims abstract description 112
- 238000001816 cooling Methods 0.000 claims abstract description 78
- 238000005192 partition Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 7
- 239000000178 monomer Substances 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 15
- 230000002829 reductive effect Effects 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000007086 side reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
Abstract
The application discloses battery package and consumer belongs to battery technology field, including the liquid cooling board, the liquid cooling board includes support, first elastomeric element and first deformation part, and support and first deformation part connect and prescribe a limit to first liquid cooling runner, and first elastomeric element sets up in first liquid cooling runner and butt between support and first deformation part; and the battery monomer is arranged on one side of the first deformation part, which is away from the bracket. The battery pack is favorable for reducing the problem that the volume expansion deformation of the battery monomer causes the effective heat exchange surface area of the liquid cooling plate to be reduced in the charging and discharging process of the battery pack.
Description
Technical Field
The application belongs to the technical field of batteries, and particularly relates to a battery pack and electric equipment.
Background
In the existing battery pack, the battery pack comprises a battery core and a liquid cooling plate, wherein the battery core can generate a large amount of heat in the charging and discharging process, and the surface with the largest surface area of the battery core is generally used as a main heat exchange surface to be attached to the liquid cooling plate. Meanwhile, in the process of charging and discharging the battery cell, the internal volume of the battery cell can be changed, and the surface with the largest surface area of the battery cell can be directly expanded and deformed, so that the area of the effective heat exchange surface of the battery cell and the liquid cooling plate is reduced, the heat exchange efficiency and the consistency of the temperature of the battery cell are reduced, and the cycle life of the battery is influenced.
Disclosure of Invention
The invention aims to: the embodiment of the application provides a battery pack, which aims to solve the problem that the area of an effective heat exchange surface is reduced due to the volume expansion deformation of a battery cell in the charging and discharging process; another object of the present application is to provide an electric device using the above battery pack.
The technical scheme is as follows: the battery pack according to the embodiment of the application includes:
the liquid cooling plate comprises a bracket, a first elastic component and a first deformation component, wherein the bracket is connected with the first deformation component and defines a first liquid cooling flow passage, and the first elastic component is arranged in the first liquid cooling flow passage and is abutted between the bracket and the first deformation component;
and the battery monomer is arranged on one side of the first deformation part, which is away from the bracket.
In some embodiments, the first deforming member comprises a body and at least one first protrusion, the first protrusion extending toward the battery cell and along a third direction, and the first protrusion connecting the battery cell, the body connecting the bracket;
the first elastic component comprises a first end and a second end which are oppositely arranged along a first direction, the first end is connected with the support, the second end is connected with one side, deviating from the battery cell, of the first convex part, and the first direction is intersected with the third direction.
In some embodiments, the body is further provided with at least one second protrusion extending along a second direction, the third direction intersects the first direction and the second direction two by two, and the second protrusion intersects at least partially the first protrusion.
In some embodiments, a side of the first deformation member facing away from the connected battery cells is formed with a first groove;
the first elastic component comprises a supporting part and an elastic part which are connected with each other, the supporting part is abutted against the bracket, and the elastic part is at least partially accommodated in the first groove.
In some embodiments, the elastic parts are provided in plurality, the elastic parts are arranged at intervals in the second direction, and the elastic parts are respectively connected with the supporting parts;
the elastic part comprises an extension sub-part and a contact sub-part, wherein the extension sub-part is provided with two ends which are oppositely arranged, one end of the extension sub-part is connected with the supporting part, the other end of the extension sub-part extends towards the first deformation component and is connected with the contact sub-part, the extension direction of the opposite ends of the extension sub-part is obliquely arranged between the support and the first deformation component, and the contact sub-part is connected with the wall of the first groove.
In some embodiments, a plurality of partitions are disposed at intervals on a side of the bracket facing the first deforming member, and the supporting portion is disposed between adjacent partitions.
In some embodiments, the first grooves are provided with a plurality of elastic parts and are arranged at intervals along the second direction, the plurality of elastic parts are connected to one side, close to the first deformation part, of the supporting part, and at least two elastic parts are respectively accommodated in the two first grooves.
In some embodiments, the total orthographic projected area of the first and second protrusions along the first direction on a plane perpendicular to the first direction is S 1 mm 2 The orthographic projection area of the body along the first direction on a plane perpendicular to the first direction is S 2 mm 2 And satisfy S of 0.3-0 1 /S 2 ≤0.7。
In some embodiments, the liquid cooling plate further includes a second elastic component and a second deformation component disposed on a side of the support away from the first elastic component, the second deformation component and the support are connected and define a second liquid cooling flow channel, and the second elastic component is disposed in the second liquid cooling flow channel and is abutted between the support and the second deformation component.
In some embodiments, the liquid cooling plate further comprises at least one current collector, a transfer runner is arranged in the current collector, the current collector is connected with the support, the transfer runner is at least communicated with one of the first liquid cooling runner and the second liquid cooling runner, the current collector is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are communicated with the transfer runner.
Correspondingly, the electric equipment comprises the battery pack.
The beneficial effects are that: the battery package of this embodiment includes liquid cooling board and battery monomer, and the liquid cooling board includes support, first elastomeric element and first deformation part, and support and first deformation part are connected and are limited first liquid cooling runner, and first elastomeric element sets up in first liquid cooling runner and butt between support and first deformation part, and battery monomer sets up in first deformation part one side that deviates from the support. The first deformation part is elastically supported by the first elastic part, the first deformation part and the first elastic part are extruded in the expansion process of the battery monomer, and the first deformation part deforms along with the battery monomer, so that the effective heat exchange area between the battery monomer and the first deformation part is ensured, after the battery monomer contracts, the first deformation part rebounds again under the elastic action of the first elastic part to back-press the battery monomer, and the reduction of the effective heat exchange area of the first deformation part and the battery monomer is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced 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 liquid cooling plate according to an embodiment of the present application;
FIG. 2 is an exploded view of a liquid cooling plate according to an embodiment of the present application;
fig. 3 is a schematic front view of a liquid cooling plate according to an embodiment of the present disclosure along a third direction;
FIG. 4 is a schematic cross-sectional view of a liquid cooling plate along line A-A according to an embodiment of the present application;
FIG. 5 is a schematic front view of the first direction according to the embodiment of the present application;
FIG. 6 is a schematic diagram of a cross-sectional structure of a liquid cooling plate along line B-B according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a bonded structure of a liquid cooling plate and a battery according to an embodiment of the present application;
fig. 8 is a schematic diagram of a front view of a liquid cooling plate and a battery according to an embodiment of the present application along a third direction;
FIG. 9 is a schematic diagram of a cross-sectional structure of a liquid cooling plate along line C-C according to an embodiment of the present application.
Reference numerals: 1. a battery cell; 2. a liquid cooling plate; 20. a bracket; 200. a partition portion; 201. an end plate; 202. a support plate; 203. a caulking groove; 21. a first elastic member; 210. a first end; 211. a second end; 212. a support part; 213. an elastic part; 2130. an extension sub-portion; 2131. a contact portion; 22. a first deforming member; 220. a body; 221. a first convex portion; 222. a second convex portion; 223. a first groove; 224. a second groove; 225. a male component; 23. a first liquid cooling flow passage; 24. a second elastic member; 25. a second deforming member; 251. a third convex portion; 252. a third groove; 26. a second liquid cooling flow path; 27. a current collector; 270. a transfer flow passage; 271. a liquid inlet; 272. a liquid outlet; 273. a liquid inlet pipe; 274. and a liquid outlet pipe.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, and at least one means may be one, two or more, unless explicitly defined otherwise.
The term "parallel" in the present application includes not only the case of absolute parallelism, but also the case of general parallelism as conventionally recognized in engineering, for example, "parallel" refers to a state in which an angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is-1 ° to 1 °; meanwhile, "vertical" includes not only the absolute vertical case but also the general vertical case of conventional engineering knowledge, for example, "vertical" refers to a state in which the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The distances are equal or the angles are equal, not only the absolute equal condition is included, but also the general equal condition of the conventional cognition in engineering is included, and certain errors can exist, for example, the tolerance range is in a state of-1%.
The applicant notes that as the energy density of the battery increases, the difficulty in controlling thermal management and thermal runaway and spread of the battery increases, and thus a larger area of cooling of the battery is required to achieve a better thermal management effect. The surface with the largest area of the battery is the main expansion deformation surface of the battery and is also the largest heat exchange surface, and the liquid cooling plate is arranged on the large surface of the battery, so that the heat exchange efficiency can be improved, and the thermal runaway spreading can be prevented.
However, the volume of the battery changes along with the intercalation and deintercalation of lithium ions in the single charge and discharge process, the internal volume of the battery increases due to the change of the thickness of the pole piece and the generation of gas by side reaction in the circulation process, and the surface expansion or contraction is shown on the large surface of the battery, so that the plane of the large surface of the battery becomes a curved surface with different curvatures in the circulation process, and if the large surface of the battery is selected as a cooling surface, the effective heat exchange surface and the effective heat exchange surface become smaller along with the continuous increase of the expansion rate of the battery, the heat exchange efficiency is reduced, the consistency of the temperature of the battery is reduced, and the cycle life of the battery is affected.
In view of the above, embodiments of the present application disclose a battery pack capable of solving at least one of the above-described drawbacks.
Referring to fig. 1 to 9, the battery pack has a first direction X, a second direction Y, and a third direction Z intersecting two by two, more specifically, the first direction X, the second direction Y, and the third direction Z are perpendicular two by two; the battery pack comprises a liquid cooling plate 2 and battery cells 1 which are distributed in a first direction X, wherein the liquid cooling plate 2 comprises a support 20, a first elastic component 21 and a first deformation component 22, the support 20 and the first deformation component 22 are connected and relatively define a first liquid cooling flow channel 23, the first elastic component 21 is arranged in the first liquid cooling flow channel 23 and is abutted between the support 20 and the first deformation component 22, and the battery cells 1 are arranged on one side, away from the support 20, of the first deformation component 22. In the present embodiment, the battery cell 1 is exemplified by a square-case battery, and the side surface of the battery cell 1 having the largest surface area is connected to the first deforming member 22.
The first deformation part 22 is elastically supported by the first elastic part 21, the first deformation part 22 and the first elastic part 21 are extruded in the expansion process of the battery monomer 1, and the first deformation part 22 deforms along with the battery monomer 1, so that the reduction of the effective heat exchange area with the battery monomer 1 in the deformation process of the first deformation part 22 is avoided, meanwhile, the expansion of the battery monomer 1 can be adapted to by virtue of the deformation capacity of the first deformation part 22 and the elasticity of the first elastic part 21, the expansion of the battery monomer 1 is prevented from being blocked by the overlarge rigidity of the liquid cooling plate 2, the damage to the battery monomer 1 is avoided, and the cycle life of the battery monomer 1 is prolonged; when the battery cell 1 is contracted, the first deformation member 22 rebounds again under the elastic action of the first elastic member 21 to back-press the battery cell 1, thereby avoiding the reduction of the effective heat exchange area of the first deformation member 22 and the battery cell 1 in the contraction stage of the battery cell 1.
Specifically, referring to fig. 1, 2 and 9, the bracket 20 includes a support plate 202 and two end plates 201, and the two end plates 201 are in one-to-one correspondence and connect opposite ends of the support plate 202 in the second direction Y. The first deforming member 22 includes a body 220, two end plates 201 are provided with caulking grooves 203 respectively towards the side surfaces of the battery cell 1, opposite ends of the body 220 in the second direction Y are respectively embedded into the corresponding caulking grooves 203, at this time, the body 220, the support plate 202 and the two end plates 201 relatively form a first liquid cooling flow channel 23, and the body 220 is conveniently and rapidly positioned and installed through the two caulking grooves 203, and meanwhile, the tightness of the first liquid cooling flow channel 23 is improved.
It should be noted that, in this embodiment, the support plate 202 may be hollow out, and the integral support 20 may be connected with the frame and the bottom plate of the battery pack during the assembly process of the battery pack, so as to replace the beam structure of the conventional battery pack box, thereby reducing the number of components in the battery pack, being beneficial to reducing the cost of the battery pack, improving the volume utilization rate and the weight energy density of the battery pack, and realizing the overall light weight of the battery pack.
It can be understood that, referring to fig. 4 and 9, after the body 220 is embedded with the two slots 203, in this embodiment, the surface of the body 220 facing the battery cell 1 and the surface of the end plate 201 facing the battery cell 1 are higher than the surface of the body 220 facing the battery in the first direction X in order to avoid the falling off of the body 220 after the body 220 is embedded with the two slots 203, thereby improving the structural reliability of the battery pack.
Referring to fig. 1 and 2, the body 220 is provided with at least one first protrusion 221 extending along the third direction Z toward the battery cell 1, and in this embodiment, the first protrusion 221 is provided in plurality, the plurality of first protrusions 221 are disposed at intervals in the second direction Y, and the first protrusions 221 are connected to the battery cell 1. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.
It should be noted that, referring to fig. 3 and 9, in the present embodiment, two battery units 1 are sequentially arranged along the third direction Z on one side of the body 220 facing away from the bracket 20, a space exists between two adjacent battery units 1, and correspondingly, two sets of first protrusions 221 are arranged on the body 220 along the third direction Z, and the two sets of first protrusions 221 are not connected to each other so as to adapt to the space between two battery units 1. In other embodiments, one or more than two battery cells 1 may be flexibly arranged according to the size of the battery cells 1 and the length dimension of the holder 20 in the third direction Z. It can be appreciated that the plurality of first protrusions 221 increases the area in contact with the battery cell 1, thereby securing a sufficient heat exchange area and improving the cooling effect on the battery cell 1.
Referring to fig. 2, 4 and 9, the first elastic member 21 includes a first end 210 and a second end 211 disposed opposite to each other in the first direction X, the first end 210 being coupled to the bracket 20, the second end 211 being coupled to a side of the first protrusion 221 facing away from the battery cell 1. In this embodiment, the number of the first protrusions 221 is also multiple, and the number of the corresponding first elastic members 21 is also multiple, so as to ensure that each first protrusion 221 can rebound and keep the large surface of the battery monomer 1 in the lamination shrinkage process by virtue of the elastic action of the first elastic member 21, which is favorable for timely recovering the shell of the battery monomer 1 when the inner pole piece is retracted, and avoiding the reduction of the effective heat exchange area outside the battery monomer 1.
In some embodiments, referring to fig. 1 to 3 and 9, the body 220 is further provided with at least one second protrusion 222 extending in the second direction Y toward the battery cell 1, the second protrusion 222 is provided in plurality, the plurality of second protrusions 222 are spaced apart in the third direction Z, and the second protrusion 222 at least partially intersects the first protrusion 221. In the present embodiment, the body 220 corresponds to two battery cells 1 on the side surface in the first direction X, and the first protrusions 221 are provided in two groups, so the second protrusions 222 are also provided in two groups, and the two groups of second protrusions 222 correspond to the two groups of first protrusions 221 one by one. The second protrusions 222 may partially intersect with a corresponding set of the first protrusions 221, and each of the second protrusions 222 in this embodiment intersects with a corresponding set of the respective first protrusions 221, thereby forming a protrusion assembly 225 at the side of the body 220 facing the battery cell 1.
It can be understood that, in this embodiment, each set of the first protrusion 221 and the second protrusion 222 intersect with each other to form an integral netlike protrusion assembly 225, and the integral protrusion is in an inward concave direction expanding state when being stressed inward, so as to fit the large-surface deformation condition of the battery cell 1, and compared with the first protrusion 221 and the second protrusion 222 which extend independently, the protrusion assembly 225 is stressed more uniformly in the expansion process of the battery cell 1, and the fit to the large-surface deformation of the battery cell 1 is better, thereby reducing the influence on the heat exchange area in the expansion and deformation process of the battery cell 1.
In some embodiments, referring to fig. 2, 4 and 9, after the first protrusion 221 protrudes toward the battery cell 1, a corresponding first groove 223 is formed on a side of the body 220 facing away from the opposite battery cell 1. The first elastic member 21 includes a supporting portion 212 and an elastic portion 213 connected to each other, and the supporting portion 212 is abutted against the support plate 202, and the elastic portion 213 is at least partially accommodated in the first groove 223. The first groove 223 forms a limiting function on the elastic portion 213, and improves the position stability of the elastic portion 213 supporting the first protrusion 221.
Further, in some embodiments, referring to fig. 2, 4 and 9, a plurality of elastic portions 213 are provided, the plurality of elastic portions 213 are spaced apart in the second direction Y, and the plurality of elastic portions 213 are respectively connected to the supporting portion 212. In this embodiment, each first elastic member 21 includes two elastic portions 213, that is, each first elastic member 21 is supported by two adjacent first grooves 223 in the second direction Y in a one-to-one correspondence with the two elastic portions 213.
Further, referring to fig. 4, the elastic portion 213 includes an extension sub-portion 2130 and a contact sub-portion 2131, the extension sub-portion 2130 has two opposite ends, one end of the extension sub-portion 2130 is connected to the supporting portion 212, the other end of the extension sub-portion 2130 extends toward the main body 220 and is connected to the contact sub-portion 2131, the extending directions of the opposite ends of the extension sub-portion 2130 are obliquely arranged between the bracket 20 and the main body 220, and the contact sub-portion 2131 is connected to the wall of the first groove 223. In the present embodiment, the two extending sub-portions 2130 of the same first elastic member 21 extend from one end of the connection support portion 212 toward each other, and the two contact sub-portions 2131 extend in opposite directions in the second direction Y in the corresponding first groove 223 to fit the size of the first groove 223 in the second direction Y. When the battery cell 1 expands, the first protrusion 221 is pressed toward the support portion 212 after the pressure is transmitted to the contact portion 2131, and the inclined extension portion 2130 is pressed toward the support portion 212, and the material used for the first elastic member 21 as a whole includes, but is not limited to, a series of materials such as aluminum, steel, and a memory alloy, which have the characteristics of storing energy by deformation and releasing energy when recovering the deformation, and all have a tendency to recover against an external force when being elastically deformed under pressure.
The above liquid cooling plate 2 structure can give the pressure of the battery monomer 1 all the time, so that the battery monomer 1 is in a pressed state, the deformation degree of the battery monomer in the service life cycle is slowed down, and the service life of the battery monomer 1 is prolonged.
It is understood that the first elastic member 21 may be integrally formed, and the first elastic member 21 extends along the third direction Z, so as to reduce the obstruction of the first liquid cooling channel 23 by each portion.
Meanwhile, it is understood that in some embodiments, when the number of the elastic portions 213 on each supporting portion 212 is greater than the number of the opposite first grooves 223, a portion of the elastic portions 213 may also be directly supported on the side of the body 220 facing the support plate 202.
In addition, in order to quickly position the mounting support portion 212 and improve stability of the support portion 212, in some embodiments, referring to fig. 4, the side surface of the support plate 202 facing the body 220 is provided with a plurality of partition portions 200 at intervals in the second direction Y, and each support portion 212 is disposed between two adjacent partition portions 200.
To ensure that the heat exchange area provided by the protrusion assembly 225 relative to the battery cell 1 is sufficient, and to ensure the heat dissipation effect of the battery cell 1, and to ensure the extrusion effect of the protrusion assembly 225 relative to the battery cell 1, in some embodiments, the orthographic projection area of the protrusion assembly 225 along the first direction X on a plane perpendicular to the first direction X is S 1 mm 2 The orthographic projection area of the body 220 along the first direction X on a plane perpendicular to the first direction X is S 2 mm 2 And satisfy S of 0.3-0 1 /S 2 It will be appreciated that the orthographic projection, i.e., the parallel projection line, is perpendicular to the projection plane, and in this embodiment the orthographic projection area is the contact area between the projection assembly 225 and the battery cell 1, i.e., the heat exchange area, and S 1 /S 2 I.e., the ratio of the heat exchange area formed by the lobe assembly 225 to the sides of the body 220. In this embodiment, when the body 220 faces two batteries, the number of the protruding parts 225 is two, and S is 1 mm 2 I.e., the sum of the forward projected areas of the two tab assemblies 225 toward the battery cell 1.
S 1 /S 2 May be 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4,A range value of any one or any two of 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7.
S is the same as that of S 1 mm 2 、S 2 mm 2 In this embodiment, the length and width dimensions of the first protrusion 221 and the body 220 may be measured by using scale values.
In addition, referring to fig. 1, 2 and 4, in some embodiments, the liquid cooling plate 2 further includes a second elastic member 24 and a second deforming member 25 disposed on a side of the support frame 20 facing away from the first elastic member 21, the second deforming member 25 being connected to the support frame 20 and forming a second liquid cooling flow passage 26, the second elastic member 24 being disposed in the second liquid cooling flow passage 26 and supported between the support frame 20 and the second deforming member 25. In this embodiment, the structure of the second elastic member 24 is the same as that of the first elastic member 21, the structure of the second deformation member 25 is the same as that of the first elastic member 21, that is, the battery cells 1 can be disposed on both sides of the bracket 20 in the first direction X, and similarly, the second deformation member 25 is provided with the third protrusion 251 which is the same as that of the first protrusion 221, and the second deformation member 25 is formed with the third groove 252 for supporting the first elastic member 21. The combined structure of the second deforming member 25 and the second elastic member 24 has the same advantageous effects as the combined structure of the first deforming member 22 and the first elastic member 21, and will not be described again.
In addition, referring to fig. 2 and fig. 5 to 7, in some embodiments, the liquid cooling plate 2 further includes at least one current collector 27, a switching flow passage 270 is disposed in the current collector 27, the current collector 27 is connected to the support 20, the switching flow passage 270 is at least in communication with one of the first liquid cooling flow passage 23 and the second liquid cooling flow passage 26, the current collector 27 is provided with a liquid inlet 271 and a liquid outlet 272, and the liquid inlet 271 and the liquid outlet 272 are in communication with the switching flow passage 270.
In this embodiment, two current collectors 27 are provided, and the two current collectors 27 are in one-to-one correspondence and connected to two ends of the support plate 202 in the third direction Z. The liquid inlet 271 and the liquid outlet 272 are disposed on two sides of the same current collector 27 in the first direction X, at this time, the internal connection flow channel 270 of the current collector 27 needs to be divided into two parts corresponding to the liquid inlet 271 and the liquid outlet 272 one by one, the liquid inlet 271 is communicated with the first liquid cooling flow channel 23, and the liquid outlet 272 is directly communicated with the second liquid cooling flow channel 26, so as to avoid the liquid inlet 271 being directly communicated with the liquid outlet 272 in the current collector 27. The current collector 27 can be connected to a liquid inlet 273 at the liquid inlet 271 so as to be externally connected to a pipeline, and similarly, the current collector 27 can be connected to a liquid outlet 274 at the liquid outlet 272 so as to be externally connected to a pipeline. After entering the current collector 27 through the liquid inlet 271, the liquid flows through the first liquid cooling flow channel 23, flows into the second liquid cooling flow channel 26 through the internal switching flow channel 270 in the other current collector 27, and finally is discharged through the liquid outlet 272, so that the liquid can be cooled again in a circulating way.
It will be appreciated that the arrangement of the current collectors 27 includes, for example, when the liquid cooling plate 2 has only a single first liquid cooling channel 23, and the liquid cooling plate 2 may have only one current collector 27 (not shown), and the liquid inlet 271 and the liquid outlet 272 are located at the same end of the liquid cooling plate 2, where the first liquid cooling channel 23 needs to be separated in the liquid cooling plate 2 to guide the cooling liquid to enter from the liquid inlet 271, flow along the first liquid cooling channel 23 away from the liquid inlet 271, and flow again to the liquid outlet 272, so as to cover the surface of the liquid cooling plate 2 facing the battery cell 1.
Next, the battery pack of the present application was also provided for comparison of different S by examples and comparative examples 1 /S 2 Comparing test results and evaluating performance by taking values:
wherein examples 1 to 10 satisfy 0.3.ltoreq.S 1 /S 2 ≤0.7。
The specific test conditions of the test are as follows: a body 220 of 194mm length and 110mm width is taken and its area S 2 mm 2 21340mm 2 . By selecting different S 1 mm 2 The method is used for the same kind of battery pack, the battery pack circulates 1000 times under the condition of 2% -97% SOC, and the battery pack capacity attenuation rate is tested. The battery containing capacity test method refers to the relevant clauses in national standard GB/T31484-2015 ' requirements for cycle life of power storage batteries for electric vehicles ' and test method '. The capacity of the battery cell is attenuated after multiple charge and discharge cycles, usually when electricity is suppliedWhen the capacity of the battery cell is reduced to about 80% of the original capacity, the performance of the battery cell is significantly reduced, and the battery cell should be maintained or replaced. Thus, the degree of capacity fade after a certain number of charge and discharge cycles of a test cell can be used to evaluate the life of the cell.
The test conditions of example 1 and example 12 are substantially the same as those of example 1, except that example 11 takes S 1 /S 2 < 0.3, example 12S was taken 1 /S 2 ＞0.7。
The test data are shown in the following table:
analysis of results: as can be seen from the above examples, when the value range satisfies 0.3.ltoreq.S 1 /S 2 Less than or equal to 0.7, after 1000 battery pack charge-discharge cycles, the battery pack attenuation is more than 80% of the original capacity, and S is taken 1 /S 2 Less than 0.3, take S 1 /S 2 At > 0.7, the battery packs all decay to less than 80% of the original capacity. Wherein S is 1 /S 2 More preferably in the range of 0.4.ltoreq.S 1 /S 2 ≤0.6。
It can be understood that the factors of battery bulge and battery capacity attenuation are caused by the generation of gas generated by side reaction inevitably occurring in the normal charge and discharge process of the battery pack are not considered, S in the test 1 /S 2 Relates to the effect of the liquid cooling plate 2 on the heat control and extrusion force control of the battery monomer 1, and is tested in the test 1 /S 2 If too small, the heat exchange area between the liquid cooling plate 2 and the battery monomer 1 is reduced, and the heat dissipation performance of the battery pack is reduced, thereby influencing the cycle life of the battery pack, S 1 /S 2 When the pressure of the liquid cooling plate 2 relative to the battery cell 1 is too large, it is difficult to control the pressure of the liquid cooling plate 2 structurally, for example, the battery cell 1 generates irreversible bulge under side reaction, and the adverse effect on the battery cell 1 is easily caused by too large extrusion force of the liquid cooling plate 2.
Correspondingly, the embodiment of the application provides electric equipment, and the electric equipment comprises the battery pack. The electric equipment can be electronic equipment such as a computer, a mobile phone and the like, power storage equipment or equipment such as a power automobile and the like, and it can be understood that the electric equipment can have all technical characteristics and corresponding beneficial effects of the battery pack and is not described in detail herein.
The above describes a battery pack and electric equipment provided by the embodiments of the present application in detail, and specific examples are applied to illustrate the principles and embodiments of the present application, where the description of the above embodiments is only used to help understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A battery pack, comprising:
the liquid cooling plate (2), the liquid cooling plate (2) comprises a bracket (20), a first elastic component (21) and a first deformation component (22), the bracket (20) is connected with the first deformation component (22) and limits a first liquid cooling flow channel (23), and the first elastic component (21) is arranged in the first liquid cooling flow channel (23) and is abutted between the bracket (20) and the first deformation component (22);
the battery unit (1) is arranged on one side of the first deformation component (22) away from the bracket (20);
the first deformation component (22) comprises a body (220) and at least one first convex part (221), the first convex part (221) extends towards the battery cell (1) along a third direction (Z), the first convex part (221) is connected with the battery cell (1), and the body (220) is connected with the bracket (20);
the first elastic component (21) comprises a first end (210) and a second end (211) which are oppositely arranged along a first direction (X), the first end (210) is connected with the bracket (20), the second end (211) is connected with one side of the first convex part (221) away from the battery cell (1), and the first direction (X) is intersected with the third direction (Z);
wherein the first protrusion (221) and the first elastic member (21) are configured to deform when the battery cell (1) expands, and the first elastic member (21) is configured to apply a force to the first protrusion (221) when the battery cell (1) contracts, so that the first protrusion (221) can rebound and attach to the battery cell (1).
2. A battery pack according to claim 1, wherein the body (220) is further provided with at least one second protrusion (222) extending in a second direction (Y) towards the battery cell (1), the third direction (Z) intersecting the first direction (X) and the second direction (Y) in pairs, the second protrusion (222) intersecting at least partially the first protrusion (221).
3. A battery pack according to claim 1, wherein the side of the first deformation member (22) facing away from the connected battery cells (1) is formed with a first recess (223);
the first elastic component (21) comprises a supporting part (212) and an elastic part (213) which are connected with each other, the supporting part (212) is abutted against the bracket (20), and the elastic part (213) is at least partially accommodated in the first groove (223).
4. A battery pack according to claim 3, wherein a plurality of the elastic parts (213) are provided, the plurality of elastic parts (213) are provided at intervals in the second direction (Y), and the plurality of elastic parts (213) are respectively connected to the supporting parts (212);
the elastic part (213) comprises an extension sub-part (2130) and a contact sub-part (2131), the extension sub-part (2130) is provided with two opposite ends, one end of the extension sub-part (2130) is connected with the supporting part (212), the other end of the extension sub-part (2130) extends towards the first deformation component (22) and is connected with the contact sub-part (2131), the extension sub-part (2130) is obliquely arranged between the bracket (20) and the first deformation component (22) in the extending direction of the two opposite ends, and the contact sub-part (2131) is connected with the groove wall of the first groove (223).
5. A battery pack according to claim 3, wherein a plurality of partitions (200) are provided at intervals on a side of the bracket (20) facing the first deforming member (22), and the support portion (212) is provided between adjacent partitions (200).
6. A battery pack according to claim 4, wherein the first grooves (223) have a plurality of elastic portions (213) disposed at intervals along the second direction (Y), the plurality of elastic portions (213) are connected to a side of the supporting portion (212) near the first deforming member (22), and at least two of the elastic portions (213) are respectively accommodated in two of the first grooves (223).
7. The battery pack according to claim 2, wherein a total area of orthographic projections of the plurality of first protrusions (221) and the plurality of second protrusions (222) on the body (220) along the first direction (X) on a plane perpendicular to the first direction (X) is S 1 mm 2 An orthographic projection area of the body (220) along the first direction (X) on a plane perpendicular to the first direction (X) is S 2 mm 2 And satisfy S of 0.3-0 1 /S 2 ≤0.7。
8. A battery pack according to claim 1, wherein the liquid cooling plate (2) further comprises a second elastic member (24) and a second deformation member (25) disposed on a side of the bracket (20) away from the first elastic member (21), the second deformation member (25) and the bracket (20) are connected and define a second liquid cooling flow channel (26), and the second elastic member (24) is disposed in the second liquid cooling flow channel (26) and abuts between the bracket (20) and the second deformation member (25).
9. The battery pack according to claim 8, wherein the liquid cooling plate (2) further comprises at least one current collector (27), a transfer flow passage (270) is arranged in the current collector (27), the current collector (27) is connected with the support (20), the transfer flow passage (270) is at least communicated with one of the first liquid cooling flow passage (23) and the second liquid cooling flow passage (26), the current collector (27) is provided with a liquid inlet (271) and a liquid outlet (272), and the liquid inlet (271) and the liquid outlet (272) are communicated with the transfer flow passage (270).
10. A powered device comprising a battery pack as claimed in any one of claims 1 to 9.
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| CN202311042136.4A CN116799415B (en) | 2023-08-18 | 2023-08-18 | Battery pack and electric equipment |
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