CN107346804B - Battery pack - Google Patents
Battery pack Download PDFInfo
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- CN107346804B CN107346804B CN201710183869.8A CN201710183869A CN107346804B CN 107346804 B CN107346804 B CN 107346804B CN 201710183869 A CN201710183869 A CN 201710183869A CN 107346804 B CN107346804 B CN 107346804B
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- battery
- metal plate
- adjacent
- battery pack
- cell
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 81
- 239000002184 metal Substances 0.000 claims abstract description 81
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 238000000926 separation method Methods 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 27
- 239000003792 electrolyte Substances 0.000 claims description 6
- 239000013536 elastomeric material Substances 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 3
- 239000007779 soft material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
-
- 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 invention provides a battery pack, which comprises at least two battery units stacked, wherein the shell of each battery unit comprises an upper metal plate and a lower metal plate, and a sealing piece is arranged between the upper metal plate and the lower metal plate; the metal plate parts of the adjacent battery units are connected together in a conductive manner, the sealing metal plate connection areas of the adjacent battery units are in a corrugated structure, and a plurality of gaps are formed between the corrugated structures. Compared with the prior art, the battery pack provided by the invention has the advantages that the corrugated structures are arranged in the connecting areas between the adjacent battery units, and a plurality of gaps are formed between the corrugated structures, so that the safety protection structure of the battery units is formed, and the damage caused by the expansion or the compression deformation of the battery units can be effectively reduced or eliminated.
Description
Technical Field
The invention belongs to the technical field of battery manufacturing, and particularly relates to a battery pack.
Background
Currently, bipolar battery construction is a common design approach in fuel cell construction, and bipolar batteries can be used to increase battery energy storage capacity on a weight and volume basis, reduce packaging weight and volume, provide stable battery performance, and low internal resistance.
The structure of bipolar batteries generally comprises an electrically conductive bipolar layer, a so-called bipolar plate, which serves as an electrical interconnect between adjacent cells in the battery and as a partition between the individual battery cells. In order to successfully utilize the bipolar structure, the bipolar plates need to be sufficiently conductive to transfer current from one cell to another and have good chemical stability in the battery environment.
Referring to fig. 1, fig. 1 is a schematic diagram of a bipolar battery (see patent publication No. CN1555584 a), in which bipolar plates 2 are disposed inside a battery case 1 to form a plurality of battery cells at intervals, two sides of the bipolar plates 2 are respectively a positive electrode and a negative electrode (reference numerals 3 and 5 in the figure) of the battery, an insulating separator 4 is disposed between the positive electrode and the negative electrode of the battery, and an electrolyte is filled in a gap between the bipolar plates 2. Such a bipolar battery structure has a problem in that when a certain battery cell is expanded or damaged, it is easy to damage the adjacent battery cell due to the buffer-free structure, for example, the adjacent battery cell is damaged due to expansion, and even the whole casing of the battery may be expanded, thereby damaging the whole battery pack structure. Therefore, the bipolar battery of such a structure is likely to be damaged due to the failure of the individual battery cells.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a battery pack, which can solve the technical problem that the battery pack structure is unstable due to the lack of a safety protection structure in the bipolar battery structure in the prior art.
In order to solve the above problems, the present invention provides a battery pack including at least two battery cells stacked, a case of the battery cells including an upper metal plate and a lower metal plate, a sealing member being disposed between the upper metal plate and the lower metal plate; the metal plate parts of the adjacent battery units are connected together in a conductive manner, the sealing metal plate connection areas of the adjacent battery units are in a corrugated structure, and a plurality of gaps are formed between the corrugated structures.
According to a preferred embodiment of the invention, each metal plate comprises a connection region for electrically conductive connection between adjacent battery cells and a separation region, the seal being provided between the separation regions of the two metal plates of the same battery cell.
According to a preferred embodiment of the invention, the separation area is provided at one or both ends of the metal plate.
According to a preferred embodiment of the present invention, when the separation region is provided at one end of the metal plate, the different cell separation regions are provided in different orientations.
According to a preferred embodiment of the invention, the seal is made of an elastic material.
According to a preferred embodiment of the present invention, one or more sealing members are provided between the separation regions at the same ends of the two metal plates of the same battery cell, and when a plurality of sealing members are provided between the separation regions at the same ends of the two metal plates of the same battery cell, the material of each sealing member may be the same or different.
According to a preferred embodiment of the invention, two sealing members are arranged between the separation areas of the same ends of the two metal plates of the same battery unit, and the elastic coefficient of the material close to the inner sealing member of the battery unit is larger than that of the material close to the outer sealing member of the battery unit.
According to a preferred embodiment of the present invention, an elastic support body is provided between the same end separation regions of adjacent metal plates of adjacent battery cells.
According to a preferred embodiment of the present invention, the battery pack further includes a circuit board provided between the same end separation regions of the adjacent metal plates of the adjacent battery cells.
According to a preferred embodiment of the present invention, sealing tapes are further attached to the outer circumferences of the same end separation regions of the two metal plates of the same battery cell.
Compared with the prior art, the battery pack provided by the invention has the advantages that the corrugated structures are arranged in the connecting areas between the adjacent battery units, and a plurality of gaps are formed between the corrugated structures, so that the safety protection structure of the battery units is formed, and the damage caused by the expansion or the compression deformation of the battery units can be effectively reduced or eliminated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and 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 bipolar battery commonly used in the prior art;
fig. 2 is a schematic view of the structure of a first embodiment of the battery pack of the present invention;
fig. 3 is a structural view of a first embodiment of a battery cell;
fig. 4 is a schematic view of the structure of a second embodiment of the battery pack of the present invention;
fig. 5 is a structural view of a second embodiment of a battery cell;
fig. 6 is a structural view of a third embodiment of a battery cell;
FIG. 7 is a schematic illustration of the deformation of the first seal in the embodiment of FIG. 6;
fig. 8 is a schematic view of the structure of a third embodiment of the battery pack of the present invention;
fig. 9 is a structural view of a fourth embodiment of a battery cell;
FIG. 10 is a schematic illustration of the deformation of the arcuate segment of the battery cell of the embodiment of FIG. 9;
fig. 11 is a schematic view of the structure of a fourth embodiment of the battery pack of the present invention;
fig. 12 is a schematic view of the structure of a fifth embodiment of the battery pack of the present invention;
fig. 13 is a schematic view of the structure of a sixth embodiment of the battery pack of the present invention;
fig. 14 is a schematic view of the structure of a seventh embodiment of the battery pack of the present invention;
fig. 15 is a schematic view of a modified embodiment of the battery pack structure in the embodiment of fig. 14;
fig. 16 is a schematic view of another modified embodiment of the battery pack structure in the embodiment of fig. 14;
fig. 17 is a schematic view of the structure of an eighth embodiment of the battery pack of the present invention; and
fig. 18 is a modified embodiment of the battery pack structure in the embodiment of fig. 17.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present invention, but do not limit the scope of the present invention. Likewise, the following examples are only some, but not all, of the examples of the present invention, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present invention.
Example 1
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first embodiment of a battery pack according to the present invention; the battery pack in this embodiment includes 5 battery cells (A, B, C, D, E), although in other embodiments the number of battery cells is not limited to 5 and may be 2, 3, 4, 6, … … or more. The specific number depends on the output voltage requirements of the battery. A plurality of battery cells connected in series may constitute a battery pack having a specified output voltage.
The outer sides of the battery pack are upper and lower end plates (11, 22), and the upper and lower end plates (11, 22) may be metal collector plates, which function as electric conduction and external support, and thus are required to have an electric conduction function and a certain mechanical strength. In addition, the upper and lower end plates (11, 22) may also be support plates for forming the outer casing of the battery pack. The upper and lower end plates (11, 22) may provide metal support inside the battery case. The upper and lower end plates (111, 22) may also serve as external positive and negative poles of the battery.
Referring to fig. 3, fig. 3 is a structural diagram of a first embodiment of a battery cell, wherein metal plates 110 are disposed on both sides of each battery cell, and metal plate portions of adjacent battery cells are electrically connected together. In this embodiment, each metal plate 110 includes a connection region 111 and a separation region 112, and the connection region 111 is used for conductive connection between adjacent battery cells. In this embodiment, the separation region 112 is disposed at one end of the metal plate 110, and the other end is directly connected to the connection region 111, and preferably, the connection region 111 and the separation region 112 are integrally formed by stamping from the same metal plate.
Preferably, the adjacent metal plates of the adjacent battery units are fixedly connected. In this embodiment, the adjacent metal plate connection regions 111 of the adjacent battery cells are directly abutted against each other, but in other embodiments, the adjacent metal plate connection regions 111 of the adjacent battery cells may be indirectly connected by a conductive material. The adjacent metal plate connection regions 111 of the adjacent battery cells may be pressed together, or welded together, or bonded together using a conductive adhesive, or the like.
With continued reference to fig. 2, in this embodiment, adjacent metal plate separation regions 112 of adjacent cells are separated to form gaps 505. This structure can counteract or alleviate deformation of the cell metal plates by the compression of the gaps 505 formed at the separation region 112 when the cell expands or is compressed. The gap 505 at the separation region 112 corresponds to a buffer chamber type safety protection structure, and can effectively prevent the battery cell from being damaged. The stability of the battery structure is ensured.
In order to provide good cushioning performance, the space of the gap 505 should not be too small, preferably, the width L of the gap 505 is at least 20% of the thickness of the battery cell, more preferably, the width L of the gap 505 is at least 40% of the thickness of the battery cell, and the value of the width L of the gap 505 can be set by those skilled in the art according to actual needs, which is not set too large in consideration of the battery capacity.
Each of the battery cells includes an anode plate 131, a cathode plate 132, and an insulating separator 133 disposed between the cathode plate 132 and the anode plate 131. The cathode and anode plates between adjacent battery units are alternately arranged. The cavity 134 inside the battery cell is for accommodating electrolyte.
The adjacent metal plates of adjacent battery cells are preferably made of different materials. The metal plate proximate anode plate 131 may be selected based on the potential of the anode, such as copper or other material. While the metal plate proximate cathode plate 132 may be selected based on the potential of the cathode, such as aluminum or other material. In other words, the metal plates proximate to the different plates may be selected based on the potential requirements of the cathode and anode.
While the materials for anode plate 131 and cathode plate 132 may be any suitable battery materials. For example, the anode plate 131 may be an alloy or oxide of tin, lithium, calcium, etc., and may be silicon, graphite, etc. other materials that can be used as the anode of the battery. While the material of cathode plate 132 may be lithium oxide as well as lithium cobaltate, lithium carbonate, etc., it is not listed here to the extent that it is understood by those skilled in the art.
The thickness of the metal plate 110 is preferably 2-100 micrometers, and in this range, on the one hand, the requirement of bending the metal plate 110 and, on the other hand, the requirement of sealing strength of the battery cell can be satisfied. Further preferably, the thickness of the metal plate 110 may be between 5 and 80 microns.
A sealing member 120 is provided between the separation regions 112 of the two metal plates of the same battery cell, so that the two adjacent metal plates of the same battery cell can be sealed and combined to prevent the electrolyte from leaking out. The electrolyte may be solid, colloidal or liquid. Seal 120 enables electrochemical isolation by sealing between adjacent cells. The material of the sealing member 120 may be any material having good adhesion between metal layers and good elasticity, such as a composite material including rubber-asbestos, aerogel blanket-polyurethane, etc., in the case of securing sealing aging; rubber-like materials, plastics, and the like.
In this embodiment, the cavity 134 formed by the cell metal plate 110 and the sealing member 120 is further provided with an elastic buffer body 140, and when the cell expands or is pressed, the elastic buffer body 140 contracts due to the compression, so as to counteract or alleviate the deformation of the cell sealing metal plate. The elastic buffer 140 is made of soft material, such as rubber, and is preferably a hollow structure, such as a hollow cube, a hollow sphere, a hollow column, a hollow ring, etc., in order to further increase the deformation amount. It will be apparent that this construction allows the cell to withstand greater cell expansion or compression deformation than if only the seal 120 were provided.
Example 2
In the following embodiments, only the differences from the structure of embodiment 1 will be described, and the same or similar structural features will not be described in detail.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a second embodiment of the battery pack according to the present invention, and the battery pack in this embodiment also includes A, B, C, D, E battery cells, which is different from the previous embodiment in that the two ends of the metal plates of the battery cells are provided with separation regions, and the separation regions of the two metal plates of the same battery cell are provided with sealing members, and the structure can form more gaps 505 between the separation regions, so that the expansion coefficient of the battery cells is further improved by one time compared with the structure in embodiment 1. In addition, an elastic buffer 140 is additionally arranged, so that the expansion resistance of the battery unit is further enhanced. Of course, the number and positions of the elastic buffer 140 are not limited to those in the embodiment of the present invention, and those skilled in the art may set according to the actual pressure resistance or expansion resistance requirements of the battery cell.
Referring to fig. 5, fig. 5 is a structural view of a second embodiment of a battery cell, and the structure of the sealing member 120 is not limited to that of the embodiment, but may be a structure extending into the cavity of the battery cell in order to improve the sealing effect. Further, referring to fig. 6, fig. 6 is a structural diagram of a third embodiment of a battery cell, in which a plurality of sealing members are disposed between the separation regions of the same ends of the two metal plates of the same battery cell, and when a plurality of sealing members are disposed between the separation regions of the same ends of the two metal plates of the same battery cell, the materials of each sealing member may be the same or different.
The number of the sealing members in this embodiment is preferably two, namely, the first sealing member 121 and the second sealing member 122 in the drawing, wherein the first sealing member 121 is positioned close to the inner side of the battery cell, and the second sealing member 122 is positioned close to the outer side of the battery cell, wherein the elastic coefficient of the material of the first sealing member 121 close to the inner side of the battery cell is greater than that of the material of the second sealing member 122 close to the outer side of the battery cell, and more preferably, the thickness of the first sealing member 121 is smaller than that of the second sealing member 122, so that when the battery cell is expanded or extruded, the first sealing member and the second sealing member can be double-layered, so that the sealing is more reliable, and the first sealing member 121 is more easily deformed, so that the deformation of the metal plate of the battery cell can be counteracted or alleviated. Referring to fig. 7, fig. 7 is a schematic diagram illustrating the deformation of the first sealing member in the embodiment of fig. 6, wherein the broken line indicates the situation after the deformation of the first sealing member 121.
Example 3
Referring to fig. 8, fig. 8 is a schematic structural diagram of a third embodiment of the battery pack according to the present invention, in which, compared with embodiment 1, the elastic support 506 is disposed between the same end separation regions of the adjacent metal plates of the adjacent battery cells, i.e. the elastic support is filled into the original gap 505, and the elasticity of the elastic support 506 can enhance the extensibility of the battery pack in the stacking direction. Any suitable material may be used for the resilient support 506. Materials such as silicone rubber, ethylene propylene diene monomer, polyethylene, and polyvinyl chloride having the following characteristics: the insulating property is good, and the electrolyte can coexist and can be stable under the voltage of 10V or less and 200 DEG or less. Preferably, the elastic support body may be elastically deformed in the stacking direction of the battery cells by at least 15% or more.
Referring to fig. 9 and 10 together, fig. 9 is a structural diagram of a fourth embodiment of a battery cell, and fig. 10 is a schematic diagram illustrating deformation of an arc-shaped section of the battery cell in the embodiment of fig. 9, which is different from the battery cell structure in embodiment 1 in that the separation region 112 includes an arc-shaped section 1102 bent inward of the battery cell, and the arc-shaped section 1102 protrudes outward to counteract or alleviate deformation of a metal plate of the battery cell when the battery cell is expanded or pressed. In addition, the seal member and the elastic buffer may not be provided.
Preferably, the connecting region 111 and the separating region 112 are integrally formed, wherein the thickness of the material of the arc-shaped segment 1102 is smaller than the thickness of the material of the other parts of the separating region 112 and the material of the connecting region 111, or the thickness of the arc-shaped segment 1102 is smaller than the thickness of one of the other parts of the connecting region 111 and the separating region 112, so that the arc-shaped segment 1102 is designed to have smaller thickness, mainly considering that when the battery cell expands or is extruded, the arc-shaped segment 1102 can be deformed more easily due to the smaller thickness of the material than the adjacent connecting region 111 and separating region 112, so that the structures of the connecting region 111, the separating region 112 and the other parts of the battery cell remain stable, and the battery cell is prevented from being damaged. The dashed lines in fig. 10 indicate the deformation of the arcuate segment 1102.
Example 4
Referring to fig. 11, fig. 11 is a schematic view showing the structure of a fourth embodiment of the battery pack according to the present invention, and it can be seen from the figure of this embodiment that, compared with the structure of embodiment 1, the conductive blocks 88 are disposed between the adjacent battery cells, specifically, the gaps 801 are disposed between the adjacent metal plate connection regions of the adjacent battery cells and are connected together by the conductive blocks 88.
The material of the conductive block 88 is preferably a soft material, such as aluminum, titanium alloy, and the like. The advantage of a soft material is that the conductive block 88 on the one hand serves to electrically connect adjacent metal plates when the cell is inflated or pressed, and on the other hand also deforms to such an extent that the cell can deform at the location of the connection region 111 in addition to the separation region 112.
Example 5
Referring to fig. 12, fig. 12 is a schematic structural diagram of a fifth embodiment of the battery pack according to the present invention, in which only A, B, C battery cells are shown, it is intended that the orientations of the cell separation regions may be staggered, i.e., some of the cell separation regions may be disposed to the left and some of the cell separation regions may be disposed to the right, and the orientations of the cell separation regions may be different. As can be seen from this embodiment, the cell separation region is not limited to being disposed toward one side in the embodiment of fig. 1. Of course, the structural features of the other parts of the battery unit are the same as those of the foregoing embodiments, and will not be described in detail herein.
Example 6
Referring to fig. 13, fig. 13 is a schematic structural view of a sixth embodiment of a battery pack according to the present invention, in which the battery pack structure is modified in two ways compared with the previous embodiments. The arrangement mode that the orientations of the separation areas are different is adopted, and the orientations of the separation areas of the four battery units are staggered in the figure; secondly, the separation region 112 of each battery cell is provided at only one side, and the other side is directly sealed and connected to the connection region 111 of the adjacent battery cell through the sealing member 120, and the structure is simpler in terms of processing than that of embodiment 1 since the separation region 112 is provided at only one side.
Example 7
Referring to fig. 14, fig. 14 is a schematic structural view of a seventh embodiment of a battery pack according to the present invention, in which the battery pack further includes a circuit board 150 disposed between the same end separation regions of adjacent metal plates of adjacent battery cells. The circuit board 150 is used for battery balancing, thermal management, or other possible functions, etc. The provision of the circuit board 150 inside the battery pack has the advantage of fully utilizing the internal space of the battery pack, reducing the number and length of the leads, and eliminating the need to extend the leads of the electrodes to the outside of the battery pack case (not shown), thereby enhancing the sealability of the battery pack as a whole. To further utilize the internal space of the battery pack, the circuit board 150 is preferably disposed at the same side of the separation region or at the same side of the battery pack.
Referring to fig. 15 together, fig. 15 is a schematic diagram of a modified embodiment of the battery pack structure in the embodiment of fig. 14, and in order to protect the circuit board 150 and further enhance the sealing performance of the sealing member 120, a sealing tape 160 is further attached to the outer periphery of the separation area at the same end of the two metal plates of the same battery unit. The material of the sealing tape 160 may be ceramic or polymer. The function of the sealing tape 160 includes preventing the circuit board 150 from being shorted, providing better chemical or electrochemical stability, providing better mechanical strength of the battery cell, and the like.
In addition, referring to fig. 16 in combination with embodiment 2, fig. 16 is a schematic view of another modified embodiment of the battery pack structure in the embodiment of fig. 14, in which it is intended that the sealing tape 160 is not necessarily disposed together with the circuit board 150, but it is also possible to separately dispose the sealing tape 160 at the outer periphery of the separation region of the battery cells, as shown in the drawing.
Example 8
Referring to fig. 17, fig. 17 is a schematic view showing the structure of an eighth embodiment of a battery pack according to the present invention, wherein the battery pack includes at least two battery cells stacked, and only two battery cells are shown, and the structure may be represented as any two adjacent battery cells. Outside of the battery unit is a sealing metal plate 110, and an anode plate, a cathode plate, and an insulating separator disposed between the cathode plate and the anode plate are disposed inside the sealing metal plate 110.
The connection regions 111 of the adjacent cell sealing metal plates are of a corrugated structure, and a plurality of gaps 101 are formed between the corrugated structures, and when the cell is expanded or extruded, the gaps 101 shrink less due to compression, thereby counteracting or relieving the deformation of the cell sealing metal plates. In the figure, the dotted arc represents the position of the deformed corrugated structure.
With continued reference to fig. 18, fig. 18 is a modified embodiment of the battery pack structure of the embodiment of fig. 17, which differs from the embodiment of fig. 17 in that only one side of the adjacent cell connecting regions 111 is provided in a corrugated structure and the other side of the connecting regions 111 is provided in a planar structure, which is an improvement made after the stability of the cell stack is sufficiently considered because the cell stack is easily displaced if both side connecting regions 111 are provided in the corrugated structure, and the stability of the cell stack and the safety of preventing the expansion of the battery are simultaneously achieved by using the one side connecting regions 111 in the planar structure and the other side connecting regions 111 in the corrugated structure.
In addition, the battery pack and battery cells in this embodiment may also include other structural features, such as providing gaps at the separation regions, elastic supports; a buffer body is arranged inside the battery unit; an arc section is arranged between the connecting area and the separating area of the metal plate; the corrugated structure and the like are arranged between the adjacent battery unit connecting areas, so that the effect of counteracting or relieving the deformation of the battery unit metal plate when the battery unit expands or is extruded can be achieved, and in addition, the circuit board is arranged inside the battery pack to improve the space utilization rate of the battery pack; the protection and sealing performance are enhanced by arranging the sealant.
The above embodiments are described for the whole structure of the battery unit and the battery pack, and the technical features of the above embodiments may be combined differently, so that it is needless to say that the above embodiments can be extended to more embodiments, and those skilled in the art will not be subjected to creative efforts, but only simple combinations of the technical features of the present invention should be within the scope of protection of the present invention.
Claims (9)
1. A battery pack, characterized in that the battery pack comprises at least two battery units which are stacked, wherein a cavity inside the battery units is used for containing electrolyte; the shell of the battery unit comprises an upper metal plate and a lower metal plate, and a sealing piece is arranged between the upper metal plate and the lower metal plate; the metal plate parts of adjacent battery units are connected together in a conductive mode, each metal plate comprises a connecting area and a separating area, the connecting areas are used for conducting connection between the adjacent battery units, the connecting areas of the adjacent battery units and the sealing metal plates are of corrugated structures, a plurality of gaps are formed between the corrugated structures, the corrugated structures are used for deforming to counteract or relieve deformation of the metal plates of the battery units, and the battery pack further comprises a circuit board arranged between the separating areas at the same ends of the adjacent metal plates of the adjacent battery units.
2. The battery of claim 1, wherein the seal is disposed between separate areas of two metal plates of the same cell.
3. The battery pack according to claim 2, wherein the separation region is provided at one or both ends of the metal plate.
4. A battery pack according to claim 3, wherein the separation regions are disposed at one end of the metal plate in different orientations.
5. The battery of claim 2, wherein the seal is made of an elastomeric material.
6. The battery pack according to claim 4, wherein one or more sealing members are provided between the separation regions of the same ends of the two metal plates of the same battery cell, and when a plurality of sealing members are provided between the separation regions of the same ends of the two metal plates of the same battery cell, the material of each sealing member may be the same or different.
7. The battery of claim 5, wherein two seals are disposed between separate areas at the same end of two metal plates of the same cell, and the material modulus of elasticity of the seal adjacent the inner side of the cell is greater than the material modulus of elasticity of the seal adjacent the outer side of the cell.
8. The battery pack according to claim 2, wherein an elastic support body is provided between the same end separation regions of the adjacent metal plates of the adjacent battery cells.
9. The battery pack according to claim 2, wherein the same end separation area of the two metal plates of the same battery cell is further provided with a sealing tape attached to the outer periphery thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305236 | 2016-05-06 | ||
| CN2016103052365 | 2016-05-06 |
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| CN107346804A CN107346804A (en) | 2017-11-14 |
| CN107346804B true CN107346804B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720305866.2U Active CN206742283U (en) | 2016-05-06 | 2017-03-24 | A kind of battery pack |
| CN201710183869.8A Active CN107346804B (en) | 2016-05-06 | 2017-03-24 | Battery pack |
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| CN201720305866.2U Active CN206742283U (en) | 2016-05-06 | 2017-03-24 | A kind of battery pack |
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| CN (2) | CN206742283U (en) |
| WO (1) | WO2017190564A1 (en) |
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| CN206742283U (en) * | 2016-05-06 | 2017-12-12 | 安徽巨大电池技术有限公司 | A kind of battery pack |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2017190564A1 (en) | 2017-11-09 |
| CN107346804A (en) | 2017-11-14 |
| CN206742283U (en) | 2017-12-12 |
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