CN116365189B - Energy storage device and electric equipment - Google Patents
Energy storage device and electric equipment Download PDFInfo
- Publication number
- CN116365189B CN116365189B CN202310635182.9A CN202310635182A CN116365189B CN 116365189 B CN116365189 B CN 116365189B CN 202310635182 A CN202310635182 A CN 202310635182A CN 116365189 B CN116365189 B CN 116365189B
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- energy storage
- storage device
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- side plate
- insulating film
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- 238000004146 energy storage Methods 0.000 title claims abstract description 103
- 239000000178 monomer Substances 0.000 claims abstract description 18
- 239000003292 glue Substances 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 13
- 238000009413 insulation Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002937 thermal insulation foam Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 229910000679 solder Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention provides an energy storage device and electric equipment. The energy storage device comprises a plurality of battery monomers, a pair of side plates and a pair of end plates, wherein the side plates are oppositely arranged along a first direction, the end plates are oppositely arranged along a second direction, an accommodating space is formed by enclosing the side plates and the end plates, and the battery monomers are arranged in the accommodating space at intervals along the second direction. The insulating piece is arranged between each end plate and each adjacent battery monomer, at least part of the surface of each battery monomer facing the side plate is covered with a first insulating film, at least the area, facing the first surfaces of the battery monomers, of each side plate corresponding to the battery monomers is covered with a second insulating film, at least one end of the second insulating film in the third direction is folded to be covered on the second surface of the side plate, the first surface and the second surface are arranged in a reverse mode along the first direction, and the first direction, the second direction and the third direction are intersected. The energy storage device can avoid the problem that the battery monomer is electrically connected with the side plate, and improves the safety.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage device and electric equipment.
Background
In the related art, the energy storage device includes a case assembly and a plurality of battery cells mounted in the case assembly. In order to realize insulation between the battery monomers and the box body assembly and insulation between every two battery monomers, the outer side of each battery monomer is coated with an insulation film. However, when the insulating film outside the battery cell is damaged due to collision, aging and the like, the battery cell is at risk of being electrically connected with the box assembly, and the safety of the energy storage device is affected.
Disclosure of Invention
The present invention aims to solve at least one of the problems of the prior art. Therefore, the invention provides the energy storage device and the electric equipment, and the double insulating film is arranged between the side plate of the energy storage device and the battery monomer, so that the problem that the battery monomer is electrically connected with the side plate can be avoided, and the safety of the energy storage device is improved.
To achieve the above object, in one aspect, the present invention provides an energy storage device comprising:
a pair of side plates oppositely arranged along a first direction, and a pair of end plates oppositely arranged along a second direction, wherein the pair of side plates and the pair of end plates enclose a containing space;
the battery monomers are arranged in the accommodating space at intervals along the second direction;
Each end plate is provided with an insulating piece between each adjacent battery monomer, at least part of the surface of each battery monomer facing the side plate is covered with a first insulating film, at least a plurality of corresponding battery monomer areas of the first surface of each side plate facing the plurality of battery monomers are covered with a second insulating film, at least one end of the second insulating film in a third direction is folded to be covered on the second surface of the side plate, the first surface and the second surface are arranged in a way that the first direction is opposite to the second surface, and the first direction, the second direction and the third direction are intersected.
In an embodiment, the second insulating film is folded at two opposite ends of the third direction to be adhered to the second surface of the side plate.
In an embodiment, the second insulating film includes a first sub-film adhered to the first surface, and a second sub-film and a third sub-film adhered to two ends of the second surface in the third direction, respectively, and the second insulating film further includes a transition film connected between the first sub-film and the second sub-film and between the first sub-film and the third sub-film;
Along the third direction, the width of the second sub-film is a, the width of the side plate is b, and the width of the third sub-film is c, wherein a/b is more than or equal to 15% and less than or equal to 25%, and c/b is more than or equal to 15% and less than or equal to 25%.
In one embodiment, the width between the second and third sub-films is d along the third direction, wherein 50% d/b is less than or equal to 65%.
In an embodiment, each side plate includes a body portion and a pair of connection portions respectively connected to opposite ends of the body portion in the second direction, and the second insulating film is attached to the body portion;
wherein each of the connecting portions forms a notch portion between each end of the third direction and one end of the corresponding body portion in the second direction, and a dimension of each of the connecting portions in the third direction is smaller than a dimension of the corresponding welded end plate in the third direction.
In an embodiment, an orthographic projection of the connecting portion on an end surface of the end plate along the first direction has a pair of sides distributed at intervals along the third direction, and a distance between each side and a corresponding side edge of the end surface of the end plate in the third direction is T1; wherein T1 is more than or equal to 0.5mm and less than or equal to 4.5mm.
In an embodiment, an output pole base is arranged on one side of the end plate in the third direction, the width dimension of the output pole base in the second direction is T2, and the width dimension of the connecting portion in the second direction is T3, wherein T3-T2 is more than or equal to 1.5mm and less than or equal to 3mm.
In an embodiment, the energy storage device further includes a plurality of connection brackets and a pair of connection plates, wherein the connection brackets are disposed in the accommodating space, the connection brackets are distributed at intervals along the second direction, one side of each connection plate, which is away from the battery cell, is attached to one end plate, and the connection plate attached to each end plate is the insulating member between the end plate and the adjacent battery cell;
each connecting support is connected to the pair of side plates on two opposite sides of the first direction respectively, each connecting plate is fixedly connected to the pair of side plates and/or each connecting plate is fixedly connected to the corresponding attached end plate on two opposite sides of the first direction respectively, a plurality of installation spaces are defined by two adjacent connecting supports, two adjacent connecting plates and the connecting supports in the accommodating space, and the installation spaces are used for installing the battery cells.
In one embodiment, the accommodating space has a first opening and a second opening opposite to each other along the third direction;
each connecting bracket is provided with a first bearing foot seat at two opposite sides of the first direction and adjacent to one end of the second opening, and each first bearing foot seat extends towards two opposite sides of the connecting bracket along the second direction; each connecting plate is provided with a second bearing foot seat at one end adjacent to the second opening at two opposite sides of the first direction, and each second bearing foot seat extends towards one side opposite to the end plate along the second direction; the first bearing foot seat and the second bearing foot seat corresponding to each installation space are used for bearing the battery cells installed in the installation space.
In one embodiment, the accommodating space has a first opening and a second opening opposite to each other along the third direction; the energy storage device further comprises a bottom plate, wherein the bottom plate is used for covering the second opening.
In an embodiment, the energy storage device further includes an upper cover, where the upper cover is used to cover the first opening; wherein, upper cover and a plurality of linking bridge are detachable connection.
In an embodiment, the first insulating film is adhered to an edge area of a surface of the battery cell facing the side plate, and a middle area of the surface of the battery cell facing the side plate is coated with glue, and the glue is used for bonding the battery cell and the side plate.
In an embodiment, the thickness of the glue is greater than the thickness of the first insulating film.
In one embodiment, the ratio of the coating area of the glue on the surface of the battery cell facing the side plate to the surface area of the battery cell facing the side plate is H, wherein H is 60% to 80%.
In another aspect, the present disclosure provides a powered device comprising an energy storage device as described in any one of the embodiments above.
Compared with the prior art, the invention has the following beneficial effects: in the energy storage device provided by the embodiment of the invention, the insulating piece is arranged between the end plate and the adjacent battery cells, and the second insulating film is adhered to the first surface of each side plate facing the plurality of battery cells, so that the insulation between the box body and the battery cells can be realized, wherein the second insulating film and the first insulating film can play a double insulating role, thereby avoiding the problem that the battery cells and the side plates are electrically connected when any one insulating film fails due to damage or aging and the like, and improving the safety of the energy storage device. Furthermore, at least one end of the second insulating film is folded to be attached to the second surface of the side plate, so that the bonding area between the second insulating film and the side plate is increased, and the bonding strength and stability between the second insulating film and the side plate are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are 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 an application scenario diagram of an energy storage device provided by an embodiment of the present invention in user side energy storage.
Fig. 2 is a schematic perspective view of an energy storage device according to an embodiment of the invention.
Fig. 3 is a schematic perspective view of the energy storage device shown in fig. 2 at another view angle.
Fig. 4 is a partially exploded perspective view of the energy storage device of fig. 2.
Fig. 5 is a partially exploded perspective view of the housing assembly of fig. 2.
Fig. 6 is a schematic perspective exploded view of the case assembly of fig. 5 at another view angle.
Fig. 7 is a schematic perspective view of the side plate of fig. 5 with the second insulating film attached thereto.
Fig. 8 is a schematic perspective view of the side plate of fig. 7 with the second insulating film attached thereto in another view.
Fig. 9 is an enlarged schematic view of the portion IX shown in fig. 2.
Fig. 10 is a schematic perspective exploded view of the case shown in fig. 5.
The main reference numerals illustrate:
1. an energy storage device; 2. an electric energy conversion device; 3. a first user load; 4. a second user load; 10. a housing assembly; 11. a case; 110. a first engagement portion; 111. a side plate; 1111. a body portion; 1112. a connection part; 112. an end plate; 113. a connecting bracket; 1131. a first bearing foot seat; 1132. a gasket accommodating space; 114. a connecting plate; 1141. a second bearing foot seat; 115. a heat insulating gasket; 12. an upper cover; 120. a second engaging portion; 121. a cover body; 122. a side plate; 123. a through hole; 124. an extension piece; 125. a housing part; 20. a battery cell; 30. a confluence assembly; 31. a first bus bar; 32. a second bus bar; 33. an output electrode base; 41. a first insulating film; 42. a second insulating film; 421. a first sub-film; 422. a second sub-film; 423. a third sub-film; 43. glue; A. a first direction; B. a second direction; C. and a third direction.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In order to facilitate understanding of the energy storage device provided by the embodiment of the present invention, some general knowledge in the energy storage technical field will be described below.
Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, in order to achieve the large goal of carbon neutralization, the current main way of generating green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources, the current generation of green electric energy generally depends on the problems of strong intermittence and large fluctuation of wind energy, solar energy and the like, the power grid is unstable, the electricity consumption is insufficient, the electricity consumption is too low, the unstable voltage also causes damage to the electric power, and therefore, the problem of 'wind abandoning and light abandoning' is possibly caused due to insufficient electricity consumption requirement or insufficient power grid receiving capability, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.
Taking electrochemical energy storage as an example, the embodiment of the invention provides an energy storage device, wherein a chemical battery is arranged in the energy storage device, chemical elements in the chemical battery are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media, namely, the electric energy generated by wind energy and solar energy is simply stored in the chemical battery, and the stored electric quantity is released for use when the use of external electric energy reaches a peak, or is transferred to a place with short electric quantity for use.
The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:
(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;
(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.
Referring to fig. 1, an embodiment of the present invention uses a home energy storage scenario in user side energy storage as an example, and an energy storage device 1 provided by the embodiment of the present invention is described. Of course, the energy storage device 1 provided in the embodiment of the present invention is not limited to a household energy storage scenario.
As shown in fig. 1, an embodiment of the present invention provides a household energy storage system, which includes an electric energy conversion device 2 (photovoltaic panel), a first user load 3 (street lamp), a second user load 4 (e.g. a household appliance such as an air conditioner), and the like, and an energy storage device 1, wherein the energy storage device 1 is a small energy storage box and can be installed on an outdoor wall in a wall-hanging manner. In particular, the photovoltaic panel can convert solar energy into electric energy during the low electricity price period, and the energy storage device 1 is used for storing the electric energy and supplying the electric energy to street lamps and household appliances for use during the electricity price peak or supplying power during the power failure/power outage of the power grid.
It is understood that in the embodiment of the present invention, the energy storage device 1 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, and the like. When the energy storage device 1 is a battery cell, it may be a prismatic battery.
The energy storage device 1 according to the embodiment of the present invention will be described in detail with reference to fig. 2 to 10.
As shown in fig. 2 to 4, the energy storage device 1 provided in the embodiment of the invention includes a case assembly 10 and at least one battery cell 20 accommodated and installed in the case assembly 10. Preferably, in the embodiment of the present invention, the energy storage device 1 includes a plurality of the battery cells 20, and the plurality of the battery cells 20 are electrically connected in series, or electrically connected in parallel, or electrically connected in series partially and electrically connected in parallel partially through the bus bar assembly 30, which is not limited. Specifically, in the example of fig. 4, the energy storage device 1 includes a plurality of the battery cells 20, and the bus assembly 30 is electrically connected in series, so that the overall capacitance of the energy storage device 1 is relatively large, and different electricity requirements of users can be satisfied. It should be noted that, the battery unit 20 may be an existing square battery, and the specific structure thereof is not described herein; the bus assembly 30 may include, but is not limited to, bus bars, connection wires, etc., as long as the electrical connection between the plurality of battery cells 20 can be achieved to achieve the electrical power transmission of the plurality of battery cells 20, which will not be described in detail later Wen Huiyou.
As shown in fig. 4 to 6, in the embodiment of the present invention, the case assembly 10 includes a case 11, and a plurality of battery cells 20 are accommodated in the case 11 side by side.
Specifically, as shown in fig. 5 and 6, in the embodiment of the present invention, the case 11 includes a pair of side plates 111 disposed opposite to each other along the first direction a and a pair of end plates 112 disposed opposite to each other along the second direction B, and the pair of side plates 111 and the pair of end plates 112 enclose a housing space, and the housing space has a first opening (i.e., an upper opening shown in fig. 5) and a second opening (i.e., a lower opening shown in fig. 5) opposite to the first opening. As shown in fig. 4, in the embodiment of the present invention, the plurality of battery cells 20 are arranged in the accommodating space of the case 11 at intervals along the second direction B. In the examples of fig. 4 to 6, the first direction a and the second direction B are the width direction and the length direction of the case 11, respectively. Of course, in other embodiments, the first direction a and the second direction B may be the length direction and the width direction of the case 11, respectively, or the first direction a and the second direction B may intersect in two other different directions, which is not limited. Optionally, the side plate 111 and the end plate 112 may be fixed by welding, screwing or clamping, and preferably by welding.
It should be noted that, in the embodiment of the present invention, an insulating member (specifically, a connection plate 114, which is described in detail later Wen Huiyou) is disposed between each end plate 112 and the adjacent battery cells 20, at least a portion of a surface of each battery cell 20 facing the side plate 111 is covered with a first insulating film 41, a region of a first surface of each side plate 111 facing the plurality of battery cells 20 (i.e., a surface facing the accommodating space) at least corresponding to the plurality of battery cells 20 is covered with a second insulating film 42, and at least one end of the second insulating film 42 in the third direction C is folded to be covered on a second surface of the side plate 111 (i.e., a surface facing away from the accommodating space). In an embodiment of the present invention, the first surface and the second surface are disposed opposite to each other along the first direction a, and the third direction C intersects both the first direction a and the second direction B. Specifically, in the examples of fig. 4 to 6, the third direction C is the height direction of the case 11.
In this way, in the energy storage device 1 provided in the embodiment of the present invention, the insulating member is disposed between the end plate 112 and the adjacent battery cells 20, and the second insulating film 42 is attached to the first surface of each side plate 111 facing the plurality of battery cells 20, so that insulation between the case 11 and the battery cells 20 can be achieved, where the second insulating film 42 and the first insulating film 41 can perform a double insulating function, so that the problem that when any one insulating film fails due to damage or aging, the battery cells 20 and the side plates 111 are electrically connected can be avoided, and the safety of the energy storage device 1 is improved. Furthermore, at least one end of the second insulating film 42 is folded to be adhered to the second surface of the side plate 111, so that the adhesion area between the second insulating film 42 and the side plate 111 is increased, which is helpful to improve the adhesion strength and stability between the second insulating film 42 and the side plate 111.
The first insulating film 41 and the second insulating film 42 may be any conventional insulating film, preferably an insulating film with good heat conductivity, so that the heat conduction efficiency between the battery cell 20 and the side plate 111 can be improved, and the heat dissipation of the battery cell 20 can be promoted.
Alternatively, in one possible embodiment, the second insulating film 42 is folded at one end of the third direction C to be attached to the second surface of the side plate 111. In another possible embodiment, the second insulating film 42 is folded over at opposite ends of the third direction C to be attached to the second surface of the side plate 111. Preferably, in the examples of fig. 5 and 6, each end of the second insulating film 42 in the third direction C is folded to be adhered to the second surface of the side plate 111, so that each end of the second insulating film 42 has a certain adhesion area with the second surface of the side plate 111, thereby helping to ensure that the opposite ends of the second insulating film 42 have stronger adhesion strength and stability with the side plate 111, and preventing the second insulating film 42 from falling off from the side plate 111. In addition, the opposite ends of the second insulating film 42 are folded and adhered to the second surface of the side plate 111, so that a larger creepage distance between the battery unit 20 and the side plate 111 along the route of the insulating film folded at any end can be ensured, and thus, reliable insulating properties between the battery unit 20 and any end of the side plate 111 along the third direction C can be ensured.
More specifically, referring to fig. 6 to 8, in one embodiment of the present invention, the second insulating film 42 includes a first sub-film 421 attached to the first surface of the side plate 111, and a second sub-film 422 and a third sub-film 423 attached to two ends of the second surface of the side plate 111 in the third direction C, respectively, and the second insulating film 42 further includes a transition film (not labeled in the figure) connected between the first sub-film 421 and the second sub-film 422 and between the first sub-film 421 and the third sub-film 423. Preferably, in the example of fig. 6 to 8, the width of the second sub-film 422 is a, the width of the side plate 111 is b, and the width of the third sub-film 423 is C, wherein 15% or less a/b or less than 25%, and 15% or less C/b or less than 25%, along the third direction C. In this embodiment, by limiting the ratio of the folded portion of each end of the second insulating film 42 (i.e., the second sub-film 422 and the third sub-film 423) to the width of the side plate 111 within a reasonable range, it is possible to ensure a sufficient bonding area between each end of the second insulating film 42 and the side plate 111, thereby ensuring a sufficient bonding strength and stability between each end of the second insulating film 42 and the side plate 111, and at the same time, it is also possible to avoid an excessive folded portion of each end of the second insulating film 42, which contributes to a reduction in the cost of the second insulating film 42. It should be understood that the second insulating film 42 may be folded along the opposite ends of the third direction C to the portions that are adhered to the second surface of the side plate 111, and the areas thereof may be the same or different, that is, the areas of the second sub-film 422 and the third sub-film 423 may be the same or different, which is not limited.
Further, in the example of fig. 6 to 8, the width between the second sub-film 422 and the third sub-film 423 is d in the third direction C, wherein 50% d/b is 65%. In this embodiment, by defining the ratio between the width d of the second sub-film 422 and the third sub-film 423 and the width b of the side plate 111, that is, the width of the area where the second surface of the side plate 111 is not provided with an insulating film, and also defining the ratio between the overall size of the folded portion of the second insulating film 42 and the width of the side plate 111 within a reasonable range, it is possible to ensure a sufficient bonding area between the whole second insulating film 42 and the side plate 111, and also to ensure a sufficient bonding strength and stability between the second insulating film 42 and the side plate 111, while avoiding excessive folded portions of the second insulating film 42, which contributes to reducing the cost of the second insulating film 42.
It is to be understood that, in other embodiments, when one end of the second insulating film 42 in the third direction C is folded and folded to be attached to the second surface of the side plate 111, a ratio value between the width of the portion of the second surface of the side plate 111, to which the second insulating film 42 is not attached, and the width b of the side plate 111 may be limited to 50% to 65%, which may have the same effect, and will not be described herein.
Referring to fig. 7 and 8 again, in one embodiment of the present invention, each of the side plates 111 includes a body 1111 and a pair of connecting portions 1112, the pair of connecting portions 1112 are respectively connected to opposite ends of the body 1111 in the second direction B, the second insulating film 42 is adhered to a surface of the body 1111, and the pair of connecting portions 1112 are respectively used for welding the pair of end plates 112.
Preferably, referring to fig. 5 to 8, in one embodiment of the present invention, a notch is formed between each end of the third direction C and one end of the corresponding body 1111 in the second direction B, and the dimension of each connecting portion 1112 in the third direction C is smaller than the dimension of the corresponding welded end plate 112 in the third direction C, that is, the end width of the side plate 111 is smaller than the end width of the end plate 112. In this embodiment, by limiting the width of the end portion of the side plate 111 to be smaller than the width of the end portion of the end plate 112, on one hand, the cost of manufacturing the side plate 111 can be reduced, and on the other hand, the assembly staff can quickly finish alignment welding without precisely aligning the end portions of the side plate 111 and the end plate 112 with high operation precision, which contributes to improvement of the tact time.
Still further preferably, referring to fig. 2 and 9, in one embodiment of the present invention, an orthographic projection of the connecting portion 1112 on an end surface of the end plate 112 along the first direction a has a pair of sides spaced apart along the third direction C, and a distance between each of the sides and a corresponding side edge of the end surface of the end plate 112 in the third direction C is T1, wherein 0.5mm is less than or equal to T1 is less than or equal to 4.5mm. In this embodiment, by limiting the distance T1 between the connecting portion 1112 and the edge of the end plate 112 in the third direction C to a reasonable range, it is ensured that the end portion of the end plate 112 exposes a welding margin of a sufficient size at the notch portion of the side plate 111, so that a spike or a protrusion is avoided from being formed on the side surface of the end plate 112 in the third direction C after the solder at the welding position overflows the end portion of the end plate 112, which may cause the side surface of the end plate 112 to be uneven to interfere with the plugging fit between the end plate 112 and the output electrode base 33 (which will be described later), thereby affecting the structural stability of the energy storage device 1 and further negatively affecting the cycle performance and the safety performance of the energy storage device 1.
Referring to fig. 10 in combination with fig. 4 to 6, in one embodiment of the present invention, the case 11 further includes a plurality of connection brackets 113 disposed in the accommodating space and a pair of connection plates 114, wherein the plurality of connection brackets 113 are distributed at intervals along the second direction B, and one side of each connection plate 114 facing away from the battery cell 20 is attached to one end plate 112, and the connection plate 114 attached to each end plate 112 is the insulating member between the end plate 112 and the adjacent battery cell 20.
Specifically, as shown in fig. 5 and 6, each of the connecting brackets 113 is fixedly connected to the pair of side plates 111 at two opposite sides of the first direction a, each of the connecting plates 114 is fixedly connected to the pair of side plates 111 at two opposite sides of the first direction a, and/or each of the connecting plates 114 is fixedly connected to the corresponding attached end plate 112. The connecting bracket 113 may be fixedly connected to the pair of side plates 111 by means of gluing or snap-fit connection, and the connecting plate 114 may be fixedly connected to the pair of side plates 111 and/or the end plate 112 to be correspondingly attached by means of gluing or snap-fit connection. In the examples of fig. 5 and 6, the connecting bracket 113 and the connecting plate 114 are fixedly connected to the pair of side plates 111 by means of gluing, so that no other connecting structure is required, which is beneficial to simplifying the structures of the connecting bracket 113 and the connecting plate 114. Preferably, in the example of fig. 10, a positioning column is disposed on a surface of the connecting plate 114 facing the corresponding end plate 112, the end plate 112 is provided with a positioning hole corresponding to the positioning column, and the connecting plate 114 is attached to the end plate 112 through cooperation of the positioning column and the positioning hole, so as to facilitate assembly of the box 11.
As shown in fig. 3 to 6, in one embodiment of the present invention, two adjacent connection brackets 113, and two adjacent connection plates 114 and the connection brackets 113 define a plurality of installation spaces in the accommodating space, and each of the battery cells 20 is correspondingly installed in one of the installation spaces. Specifically, in the present embodiment, each of the connection brackets 113 is provided with a first bearing foot 1131 at two opposite sides of the first direction a at one end adjacent to the second opening (i.e. the lower opening) of the case 11, and each of the first bearing foot 1131 extends toward two opposite sides of the connection bracket 113 along the second direction B; each of the connection plates 114 is provided with a second bearing foot 1141 at two opposite sides of the first direction a and adjacent to one end of the second opening, and each of the second bearing foot 1141 extends along the second direction B toward a side of the end plate 112 opposite to the connection plate 114. As shown in fig. 3, the first bearing foot seat 1131 and the second bearing foot seat 1141 corresponding to each installation space can be used for bearing the battery unit 20 installed in the installation space. The connection bracket 113 and the connection plate 114 may be made of insulating materials, and the first load-bearing foot seat 1131 and the second load-bearing foot seat 1141 are both substantially sheet-shaped foot seats, which are not limited thereto.
Of course, in other embodiments, the case 11 may further include a bottom plate for covering the second opening and carrying a plurality of the battery cells 20.
Preferably, referring to fig. 4 and 10, in one embodiment of the present invention, a spacer receiving space 1132 is formed in a middle area of each connecting bracket 113, the case 11 further includes a plurality of heat insulation spacers 115, each heat insulation spacer 115 is correspondingly disposed in the spacer receiving space 1132 of one connecting bracket 113, and each heat insulation spacer 115 is used for thermally isolating two adjacent battery cells 20, which is helpful for improving the safety of the energy storage device 1. The heat insulation pad 115 is preferably made of deformable heat insulation foam, and when the battery cell 20 is expanded due to thermal runaway, the heat insulation foam can absorb the expansion of the battery cell 20, so as to avoid squeezing another adjacent battery cell 20, and further improve the safety of the energy storage device 1.
Referring to fig. 2, 5 and 6, in one embodiment of the present invention, the energy storage device 1 further includes an upper cover 12 for covering the first opening (i.e. the upper opening shown in fig. 5) of the case 11, and the case 11 is detachably connected to the upper cover 12 through a threaded connection or a snap connection. The case 11 is covered by the upper cover 12, so that the plurality of battery cells 20 in the case 11 can be protected.
Specifically, as shown in fig. 2, 5 and 6, the upper cover 12 includes a cover body 121 and a pair of side plates 122 disposed on opposite sides of the cover body 121 in the first direction, and the pair of side plates 122 are disposed on a side of the cover body 121 facing the case 11. In the examples of fig. 5 and 6, a plurality of first engaging portions 110 are disposed on each side of the case 11 in the first direction and adjacent to one end of the first opening, the first engaging portions 110 are distributed at intervals along the second direction, a plurality of second engaging portions 120 are disposed on one side of each side plate 122 facing the other side plate 122, the plurality of first engaging portions 110 and the plurality of second engaging portions 120 are in one-to-one correspondence to achieve the fixation of the case 11 and the upper cover 12, and the separation of the case 11 and the upper cover 12 is achieved by releasing the cooperation of the plurality of first engaging portions 110 and the plurality of second engaging portions 120, so that the case assembly 10 is convenient to fix and detach, and is beneficial to improving the assembly efficiency of the energy storage device 1. The first engaging portion 110 and the second engaging portion 120 may be any conventional engaging structure, and will not be described in detail.
Preferably, in the examples of fig. 2 and 6, the cover body 121 is provided with a through hole 123 in a region corresponding to at least one second engaging portion 120, the through hole 123 penetrates through opposite sides of the cover body 121 in the thickness direction, and at least a portion of at least one second engaging portion 120 is exposed through the corresponding through hole 123. In this embodiment, by providing at least one through hole 123 in the cover body 121, when the upper cover 12 is covered on the first opening of the case 11, the first engaging portion 110 engaged with the corresponding second engaging portion 120 can be seen through the through hole 123, so as to determine whether the second engaging portion 120 and the corresponding first engaging portion 110 are well engaged, which is helpful for improving the assembly efficiency of the energy storage device 1.
Referring to fig. 2 again, in one embodiment of the present invention, a receiving portion 125 is disposed on a side of the cover body 121 facing away from the case 11, and the receiving portion 125 has a receiving groove for attaching a tag corresponding to the energy storage device 1. The identification piece is arranged in the accommodating groove of the accommodating part 125, so that the identification piece of the energy storage device 1 can be prevented from being damaged by friction, and the identification of products and the later tracing are facilitated.
Specifically, in the example of fig. 2, a rectangular convex ring is convexly disposed on a side of the cover body 121 facing away from the case 11, and the rectangular convex ring and the cover body 121 enclose the accommodating portion 125. In other embodiments, the accommodating portion 125 may be a groove formed on a side of the cover body 121 facing away from the case 11, and the identifier may be directly disposed in the groove.
Referring to fig. 2 to 4, in one embodiment of the invention, the upper cover 12 further includes a plurality of extending pieces 124 disposed on each side of the cover body 121 in the second direction B, the plurality of extending pieces 124 are distributed at intervals along the first direction a, the plurality of extending pieces 124 are located on a side of the cover body 121 facing the first opening, and a yielding gap is formed between each two adjacent extending pieces 124, and the yielding gap can be used for guiding out the positive and negative output stages of the bus assembly 30 and the wire harness (not shown) of the energy storage device 1. Specifically, as shown in fig. 2 to 4, the bus assembly 30 includes a plurality of first bus bars 31 and a pair of second bus bars 32, where the plurality of first bus bars 31 are used for connecting a plurality of battery units 20 in series, the pair of second bus bars 32 are located at the front end and the tail end of the battery units 20 in the serial direction, and the pair of second bus bars 32 are exposed through the two yielding notches on two opposite sides of the upper cover 12 in the length direction, so as to serve as the positive and negative output ends of the energy storage device 1, thereby realizing the electric energy transmission of the energy storage device 1. The first bus bar 31 and the second bus bar 32 may be existing bus bars, which will not be described in detail.
Further, referring to fig. 2 to 4 and fig. 9, in one embodiment of the present invention, the busbar assembly 30 further includes a pair of output electrode bases 33, and the output electrode bases 33 are used for carrying the second busbar 32 as positive and negative output ends. Specifically, as shown in fig. 2 to 4, each of the end plates 112 is provided with the output electrode base 33 on one side (a side close to the upper cover 12) in the third direction C, and the output electrode base 33 is used for carrying a portion of the second bus bar 32 extending out of the case 11. The output pole base 33 may be detachably disposed on the end plate 112 by any means such as threaded connection, snap-fit connection, or plugging. In the examples of fig. 2 to 4, each end plate 112 has a plugging hole formed on a surface of the end plate 112 adjacent to the upper cover 12 in the third direction C, the output electrode base 33 is provided with a corresponding plugging portion, and the output electrode base 33 is fixedly disposed on the end plate 112 by plugging the plugging portion into the plugging hole.
Preferably, as shown in fig. 9, in one embodiment of the present invention, the width dimension of the output electrode base 33 in the second direction B is T2, and the width dimension of the connection portion 1112 in the second direction B is T3,1.5mm < T3-T2 < 3mm. In this embodiment, by limiting the range of the difference between the width dimension T3 of the connection portion 1112 and the width dimension T2 of the output electrode base 33, that is, the width dimension corresponding to the notch portion defining the side plate 111 is greater than the width dimension T2 of the output electrode base 33, and the difference therebetween is within a reasonable range, it is possible to avoid the side plate 111 interfering with the output electrode base 33 to be assembled on the end plate 112, it is also possible to prevent the notch portion of the side plate 111 from being excessively small and requiring higher assembly operation precision, to avoid reducing production efficiency, and to prevent the notch portion of the side plate 111 from being excessively large from extending toward the body portion 1111 of the side plate 111 to a position corresponding to the battery cell 20, which may affect the connection and the cooperation between the battery cell 20 and the side plate 111 and affect the stability of the overall structure. In addition, when the notch portion of the side plate 111 extends toward the body portion 1111 of the side plate 111 to a position corresponding to the battery cell 20, after the upper cover 12 covers the case 11, a notch may exist at a position where the upper cover 12 covers the notch portion, and dust impurities easily enter the case 11 through the notch, which may affect the safety performance and the service life of the energy storage device 1.
Referring to fig. 4, in one embodiment of the present invention, the first insulating film 41 is adhered to an edge area of the surface of the battery cell 20 facing the side plate 111, and a middle area of the surface of the battery cell 20 facing the side plate 111 is coated with glue 43, where the glue 43 is used for bonding the battery cell 20 and the side plate 111. Preferably, the glue 43 is an insulating glue with good heat-conducting property, so that not only the bonding strength between each battery cell 20 and the side plate 111 can be enhanced and the structural strength of the energy storage device 1 can be improved, but also the heat of each battery cell 20 can be better conducted to the side plate 111 and the heat dissipation performance of the energy storage device 1 can be improved.
Preferably, in the example of fig. 4, the first insulating film 41 preferably further covers other peripheral wall surfaces of the battery cell 20 except for the end cap assembly, and the first insulating film 41 is further used for realizing double insulation between the battery cell 20 and the first bearing foot 1131 and the second bearing foot 1141 of the case 11.
Preferably, in the example of fig. 4, the thickness of the glue 43 is greater than the thickness of the first insulating film 41, so that the glue 43 may prop the battery cell 20 away from the side plate 111 by a distance, so as to prevent the battery case with the weak positive electricity of the battery cell 20 from being electrically connected to the side plate 111, and avoid shorting the energy storage device 1.
It can be appreciated that, when the coating area of the glue 43 on the surface of the battery cell 20 facing the side plate 111 is too small, the adhesion strength between the battery cell 20 and the side plate 111 is low; in contrast, when the coating area of the glue 43 on the surface of the battery cell 20 facing the side plate 111 is too large, not only the cost is increased, but also the arrangement area of the first insulating film 41 on the surface of the battery cell 20 facing the side plate 111 is made smaller, which is disadvantageous for the arrangement of the first insulating film 41. The area of the glue 43 applied to the surface of the battery cell 20 facing the side plate 111 should therefore be designed reasonably. Specifically, in the example of fig. 4, the ratio of the coating area of the glue 43 on the surface of the battery cell 20 facing the side plate 111 to the surface area of the battery cell 20 facing the side plate 111 is H, wherein 60% to 80% is not less than 60%, and by limiting the ratio H to a reasonable range, the problem of improper coating area of the glue 43 can be avoided.
Further, the embodiment of the invention also provides electric equipment, which comprises an electric equipment body and the energy storage device 1 provided by the embodiment of the invention, wherein the energy storage device 1 is used for supplying power to the electric equipment body. Because the energy storage device 1 includes all the technical solutions of all the embodiments, at least the technical solutions of the embodiments have all the beneficial effects brought by the technical solutions of the embodiments, and are not described in detail herein.
The electric equipment can be, but is not limited to, mobile phones, tablet computers, notebook computers, desktop computers, smart bracelets, smart watches, electronic readers, game machines, toys and other electronic equipment, and the household energy storage system.
In the description of the present invention, the description with reference to the terms "embodiment," "specific embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (12)
1. An energy storage device, comprising:
The device comprises a pair of side plates oppositely arranged along a first direction and a pair of end plates oppositely arranged along a second direction, wherein the pair of side plates and the pair of end plates enclose to form an accommodating space, and an output electrode base is arranged at one side of the end plates in a third direction and adjacent to the end part of one side plate;
the battery monomers are arranged in the accommodating space at intervals along the second direction;
an insulating piece is arranged between each end plate and each adjacent battery cell, at least part of the surface of each battery cell facing the side plate is covered with a first insulating film, at least the area, corresponding to a plurality of battery cells, of the first surface of each side plate facing the plurality of battery cells is covered with a second insulating film, at least one end of the second insulating film in a third direction is folded to be covered on the second surface of the side plate, the first surface and the second surface are arranged opposite to each other along the first direction, and the first direction, the second direction and the third direction are intersected;
each side plate comprises a body part and a pair of connecting parts, the pair of connecting parts are respectively connected to two opposite ends of the body part in the second direction, the second insulating film is adhered to the body part, a notch part is formed between each end of each connecting part in the third direction and one end of the corresponding body part in the second direction, and the size of each connecting part in the third direction is smaller than the size of the end plate in the third direction which is welded correspondingly;
The orthographic projection of the connecting part on the end face of one end of the end plate along the first direction is provided with a pair of side edges which are distributed at intervals along the third direction, the distance between each side edge and the corresponding side edge of the end face of the end plate along the third direction is T1, the width dimension of the output electrode base in the second direction is T2, the width dimension of the connecting part in the second direction is T3, T1 is less than or equal to 4.5mm, and T3-T2 is less than or equal to 1.5mm and less than or equal to 3mm.
2. The energy storage device of claim 1, wherein said second insulating film is folded over at opposite ends of said third direction to overlie said second surface of said side panel.
3. The energy storage device of claim 2, wherein the second insulating film comprises a first sub-film attached to the first surface, and a second sub-film and a third sub-film attached to both ends of the second surface in the third direction, respectively, the second insulating film further comprising a transition film joined between the first sub-film and the second sub-film and between the first sub-film and the third sub-film;
along the third direction, the width of the second sub-film is a, the width of the side plate is b, and the width of the third sub-film is c, wherein a/b is more than or equal to 15% and less than or equal to 25%, and c/b is more than or equal to 15% and less than or equal to 25%.
4. The energy storage device of claim 3, wherein a width between the second and third sub-films along the third direction is d, wherein 50% d/b is 65%.
5. The energy storage device of claim 1, further comprising a plurality of connection brackets disposed in the receiving space and a pair of connection plates, the plurality of connection brackets being spaced apart along the second direction, one side of each connection plate facing away from the battery cell being attached to one of the end plates, the connection plate to which each end plate is attached being the insulator between the end plate and the adjacent battery cell;
each connecting support is connected to the pair of side plates on two opposite sides of the first direction respectively, each connecting plate is fixedly connected to the pair of side plates and/or each connecting plate is fixedly connected to the corresponding attached end plate on two opposite sides of the first direction respectively, a plurality of installation spaces are defined by two adjacent connecting supports, two adjacent connecting plates and the connecting supports in the accommodating space, and the installation spaces are used for installing the battery cells.
6. The energy storage device of claim 5, wherein said receiving space has first and second openings opposite in said third direction;
each connecting bracket is provided with a first bearing foot seat at two opposite sides of the first direction and adjacent to one end of the second opening, and each first bearing foot seat extends towards two opposite sides of the connecting bracket along the second direction; each connecting plate is provided with a second bearing foot seat at one end adjacent to the second opening at two opposite sides of the first direction, and each second bearing foot seat extends towards one side opposite to the end plate along the second direction; the first bearing foot seat and the second bearing foot seat corresponding to each installation space are used for bearing the battery cells installed in the installation space.
7. The energy storage device of claim 5, wherein said receiving space has first and second openings opposite in said third direction; the energy storage device further comprises a bottom plate, wherein the bottom plate is used for covering the second opening.
8. The energy storage device of claim 6 or 7, further comprising an upper cover for covering the first opening;
Wherein, upper cover and a plurality of linking bridge are detachable connection.
9. The energy storage device of claim 1, wherein the first insulating film is attached to an edge region of a surface of the battery cell facing the side plate, and a middle region of the surface of the battery cell facing the side plate is coated with glue for bonding the battery cell and the side plate.
10. The energy storage device of claim 9, wherein a thickness of said glue is greater than a thickness of said first insulating film.
11. The energy storage device of claim 9, wherein the ratio between the area of the glue applied to the surface of the cell facing the side plate and the area of the surface of the cell facing the side plate is H, wherein 60% H80%.
12. A powered device comprising an energy storage device as claimed in any one of claims 1 to 11.
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| CN202310635182.9A CN116365189B (en) | 2023-05-31 | 2023-05-31 | Energy storage device and electric equipment |
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| CN202310635182.9A CN116365189B (en) | 2023-05-31 | 2023-05-31 | Energy storage device and electric equipment |
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| CN116365189B true CN116365189B (en) | 2023-08-04 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003086155A (en) * | 2001-09-14 | 2003-03-20 | Sony Corp | Battery pack |
| CN209963110U (en) * | 2019-06-03 | 2020-01-17 | 江苏塔菲尔新能源科技股份有限公司 | Module side plate structure and battery module thereof |
| CN211265549U (en) * | 2019-11-20 | 2020-08-14 | 宁德时代新能源科技股份有限公司 | Battery module, battery pack and device |
| CN217848260U (en) * | 2022-07-08 | 2022-11-18 | 中创新航科技股份有限公司 | Battery module and battery pack |
-
2023
- 2023-05-31 CN CN202310635182.9A patent/CN116365189B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003086155A (en) * | 2001-09-14 | 2003-03-20 | Sony Corp | Battery pack |
| CN209963110U (en) * | 2019-06-03 | 2020-01-17 | 江苏塔菲尔新能源科技股份有限公司 | Module side plate structure and battery module thereof |
| CN211265549U (en) * | 2019-11-20 | 2020-08-14 | 宁德时代新能源科技股份有限公司 | Battery module, battery pack and device |
| CN217848260U (en) * | 2022-07-08 | 2022-11-18 | 中创新航科技股份有限公司 | Battery module and battery pack |
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| CN116365189A (en) | 2023-06-30 |
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