CN115632073A - Battery pack and battery system - Google Patents
Battery pack and battery system Download PDFInfo
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- CN115632073A CN115632073A CN202211125405.9A CN202211125405A CN115632073A CN 115632073 A CN115632073 A CN 115632073A CN 202211125405 A CN202211125405 A CN 202211125405A CN 115632073 A CN115632073 A CN 115632073A
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
- H01L31/022458—Electrode arrangements specially adapted for back-contact solar cells for emitter wrap-through [EWT] type solar cells, e.g. interdigitated emitter-base back-contacts
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0516—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of back-contact solar cells
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- 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
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Abstract
The application discloses battery backboard belongs to battery pack technical field. The battery piece comprises a first electrode and a second electrode which are arranged along a second direction and are alternately arranged at intervals along a first direction. The connecting piece includes along the body that first direction set up between arbitrary two adjacent battery pieces and along the broach that first direction set up in the both sides of body. The comb teeth are connected with the first electrode of one of the two adjacent battery slices and connected with the second electrode of the other of the two adjacent battery slices. The first direction is perpendicular to the second direction, and the first electrode and the second electrode have opposite polarities. The comb teeth on the connecting piece are respectively connected with the opposite electrodes on the two adjacent battery pieces, so that current transmission between the two adjacent battery pieces is realized, the electrode connection with different polarities on the same battery piece is avoided, the connection between the connecting piece and the electrodes is directly realized, the processing steps are reduced, and the beneficial effect of the processing efficiency of the battery assembly is improved.
Description
Technical Field
The application belongs to the technical field of solar cells, and particularly relates to a battery pack and a battery system.
Background
With the rapid development of the photovoltaic industry, the requirements of domestic and foreign markets on the efficiency and performance of solar cells are higher and higher, which also promotes a plurality of manufacturers to actively research novel cell structures so as to obtain industrial advantages. The interdigital back contact (IBC, abbreviated as back contact) solar cell refers to a solar cell with a cell piece without electrode on the front side, wherein positive and negative electrodes are arranged on the back side of the cell piece, so that optical loss caused by shielding of grid lines of the front electrode can be thoroughly avoided, short-circuit current is improved by utilizing incident light to the maximum extent, and the energy conversion efficiency of the cell piece is further improved.
In the prior art, since the electrodes of the back contact battery are all located on the back surface of the battery, a conductive metal component is usually arranged in the integrated back plate, and the electrodes and the conductive metal component are connected through solder to realize current transmission. Because the current of battery piece self is collected and is transmitted the needs, battery piece inside is provided with more tie point. And because the conductive metal component is needed to realize current transmission, the conductive metal component is in covering contact with the battery piece, and an insulating layer is needed to be arranged for solving the contact short circuit between the electrode and the conductive metal component in covering contact.
However, in order to realize the butt joint of the electrode and the conductive metal component, the insulating layer needs to be provided with an opening, and the solder strip is connected between the electrode and the conductive metal component through the position of the opening. However, for the insulating layer, the number of the holes formed in the insulating layer is large and dense due to more cells, and perfect matching between the holes and the electrodes and the conductive metal components must be ensured when aligning the conductive metal components or the welding points of the cells, so that the requirement on alignment precision is very high, the difficulty in controlling the process yield is high, and the production efficiency is low. And the large-area conductive metal component is made of more materials and has high cost. The transmission path of the current on the large-area conductive metal component is long, and the electrical loss is large.
Disclosure of Invention
The embodiment of the application aims to provide a battery assembly and a battery system, and the problems that the packaging process of the battery assembly in the prior art is high in required precision and low in production efficiency can be solved.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a battery assembly, which includes a plurality of battery pieces, where each battery piece includes electrodes arranged along a second direction, and each electrode includes a first electrode and a second electrode, and the first electrodes and the second electrodes are alternately arranged at intervals along the first direction; the connecting piece comprises a body and comb teeth, the body is arranged between any two adjacent battery pieces along a first direction, and the comb teeth are arranged on two sides of the body along the first direction; the comb teeth on one side of the body are connected with a first electrode of one of the two adjacent battery pieces, and the comb teeth on the other side of the body are connected with a second electrode of the other of the two adjacent battery pieces, so that current transmission between the two adjacent battery pieces is realized; the first direction is vertical to the second direction, and the polarities of the first electrode and the second electrode are opposite.
In the embodiment of the present application, the electrodes on the plurality of cell sheets are interdigital electrodes having electrodes with a periodic pattern in a plane, such as a finger or comb, wherein the electrodes are alternately disposed in a positive and negative alternating manner, that is, the first electrode and the second electrode are opposite in polarity and alternately disposed. Specifically, the electrodes include first electrodes and second electrodes arranged along the second direction and alternately spaced along the first direction. The connecting piece includes body and broach, and the body sets up between arbitrary two adjacent battery pieces along the first direction, and the broach sets up in the both sides of body along the first direction, and the setting of connecting piece is used for and sets up the battery piece connection in the connecting piece both sides to realize the current transmission between the battery piece of connecting piece both sides. Specifically, the connection member may be connected to a first electrode of one of the adjacent two battery cells and may be connected to a second electrode of the other of the adjacent two battery cells. Alternatively, the connection member may be connected to the second electrode of one of the adjacent two battery cells and may be connected to the first electrode of the other of the adjacent two battery cells. The battery plates are connected with two adjacent battery plates through the connecting pieces through the opposite electrodes respectively, so that current transmission between each battery plate and the next battery plate is realized. In this application embodiment, through being connected respectively of the opposite polarity electrode on broach and the adjacent two battery pieces on the connecting piece, can realize the current transmission between the adjacent two battery pieces, simultaneously, can avoid with the electrode connection of the same battery piece different polarity on body one side broach, and then the short circuit problem can not appear, consequently no longer need set up the insulating layer that is used for preventing to cause the short circuit phenomenon between battery piece and the connecting piece, can reduce the setting of insulating layer among the primary battery subassembly. Therefore, it is not necessary to make a hole in the insulating layer and to perform welding between the connecting member and the electrode after the hole is made. But can directly realize the connection between connecting piece and the electrode, when realizing current transmission, have the beneficial effect that reduces the processing technology step, reduces the required precision of encapsulation technology, improves battery pack machining efficiency.
In a second aspect, embodiments of the present application provide a battery system including the battery assembly as described above.
Drawings
Fig. 1 is a schematic structural diagram of the arrangement of the connecting members on the battery integrated back plate in the embodiment of the present application;
fig. 2 is a schematic structural diagram of the positions of a battery piece and a battery integration back plate in the embodiment of the application;
FIG. 3 is a schematic view of a connection structure of a connection member and a cell plate in an embodiment of the present application;
fig. 4 is a schematic connection cross-sectional view of a connection member and a battery integration back plate in an embodiment of the present application;
fig. 5 is a partial enlarged view of fig. 1 at V in the embodiment of the present application.
Description of reference numerals:
10. a battery piece; 1011. a first electrode; 1021. a second electrode; 11. a connecting member; 111. a comb unit; 1111. a boss portion; 1112. a gap portion; 12. the battery integrates the backplate.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application are capable of operation in sequences other than those illustrated or described herein, and that the terms "first," "second," etc. are generally used in a generic sense and do not limit the number of terms, e.g., a first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The battery pack and the battery system provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1 to 5, an embodiment of the present application provides a battery assembly including: a plurality of battery pieces 10, wherein each battery piece 10 comprises electrodes arranged along the second direction, each electrode comprises a first electrode 1011 and a second electrode 1021, and the first electrodes 1011 and the second electrodes 1021 are alternately arranged at intervals along the first direction; the connecting piece 11 comprises a body and comb teeth, the body is arranged between any two adjacent battery pieces 10 along the first direction, and the comb teeth are arranged on two sides of the body along the first direction; the comb teeth on one side of the main body are connected with the first electrode 1011 of one of the two adjacent battery pieces 10, and the comb teeth on the other side of the main body are connected with the second electrode 1021 of the other of the two adjacent battery pieces 10, so that current transmission between the two adjacent battery pieces 10 is realized; wherein the first direction is perpendicular to the second direction, and the first electrode 1011 and the second electrode 1021 have opposite polarities.
In the embodiment of the present application, the electrodes on the plurality of battery slices 10 are interdigital electrodes having an electrode with a periodic pattern in a plane, such as a finger or comb, wherein the electrodes are alternately disposed in a positive and negative manner, that is, the first electrode 1011 and the second electrode 1021 have opposite polarities and are alternately disposed. Specifically, the electrodes include first electrodes 1011 and second electrodes 1021 arranged in the second direction and alternately spaced in the first direction. The connecting piece 11 includes body and broach, and the body sets up between arbitrary two adjacent battery pieces 10 along the first direction, and the broach sets up in the both sides of body along the first direction, and the setting of connecting piece 11 is used for being connected with the battery piece 10 that sets up in connecting piece 11 both sides to realize the current transmission between the battery piece 10 of connecting piece 11 both sides. Specifically, the connection member 11 may be connected to the first electrode 1011 of one of the two adjacent battery cells 10 and may be connected to the second electrode 1021 of the other one of the two adjacent battery cells 10. Alternatively, the connection member 11 may be connected to the second electrode 1021 of one of the two adjacent battery sheets 10, and may be connected to the first electrode 1011 of the other of the two adjacent battery sheets 10. The connecting piece 11 and two adjacent battery pieces 10 are respectively connected through the opposite electrodes, so that the current transmission between each battery piece 10 and the next battery piece 10 is realized. In this application embodiment, through being connected respectively of opposite sex electrode on broach on the connecting piece 11 and two adjacent battery pieces 10, can realize the current transmission between two adjacent battery pieces 10, simultaneously, can avoid with the electrode connection of the same battery piece 10 on different polarities at body one side broach, and then the short circuit problem can not appear, consequently no longer need set up the insulating layer that is used for preventing to cause the short circuit phenomenon between battery piece 10 and the connecting piece 11, can reduce the setting of insulating layer among the primary battery subassembly. Therefore, it is no longer necessary to make a hole in the insulating layer and to perform welding between the connecting member 11 and the electrode after the hole is made. But can directly realize the connection between connecting piece 11 and the electrode, when realizing current transmission, have the beneficial effect that reduces the processing technology step, reduces the required precision of encapsulation technology, improves battery pack machining efficiency.
It should be noted that, in the embodiment of the present application, a large-area integral metal component or metal foil used at present is changed into the connecting member 11, so that an overlapping area between the integral metal component and the battery piece 10 is reduced, a current transmission path between the battery pieces 10 is further shortened, electrical loss of current transmitted in the connecting member 11 is reduced, and a beneficial effect of improving light energy conversion efficiency of the battery component is achieved. Furthermore, the area of the whole metal component is reduced, namely the metal consumption of the whole metal component is reduced, so that the manufacturing cost of the battery component is reduced.
It should be noted that, in practical application, in order to better adapt to the environment and temperature change, a certain gap may be reserved between any two battery pieces 10 during arrangement, so as to ensure the change of expansion with heat and contraction with cold caused by the influence of the environment on the material of the battery pieces 10. The battery pack is prevented from being bent or the battery pieces 10 are prevented from being damaged due to mutual extrusion between the battery pieces 10 caused by insufficient reserve gaps.
Alternatively, in the present embodiment, the comb teeth include a plurality of comb tooth units 111, and the comb tooth unit 111 is connected to the first electrode 1011, or the comb tooth unit 111 is connected to the second electrode 1021, and the width of the comb tooth unit 111 in the first direction is a; the adjacent first electrodes 1011 and the second electrodes 1021 on the same battery piece 10 are uniformly spaced, and the spacing distance between the adjacent first electrodes 1011 and the adjacent second electrodes 1021 is Z; wherein, a =2Z.
In the embodiment of the present application, the comb teeth include a plurality of comb tooth units 111, and the plurality of comb tooth units 111 are sequentially arranged along the first direction to form the comb teeth on both sides of the main body. It can be understood that the comb tooth unit 111 is arranged such that the connecting member 11 is formed with a concave-convex structure on both sides near the electrodes, wherein the convex structure is convex toward the electrodes to be connected, and correspondingly, there are electrodes on both sides of the electrodes to be connected, which are opposite in polarity but not connected to the connecting member 11, and the electrodes correspond to the concave structure positions of the connecting member 11 in the second direction. When the connecting member 11 is connected to the electrode to be connected, the recessed structure bypasses the electrode having the opposite polarity to the connecting member 11 while the connecting member is connected to the electrode to be connected. Specifically, when the protruding structure is connected to the electrode to be connected, the naturally formed recessed structure is far away from the electrode opposite to the connection electrode, so as to avoid the occurrence of short circuit phenomenon caused by the simultaneous connection of the connection member 11 and the electrode of the same cell piece 10 with opposite polarity.
It should be noted that the comb-teeth units 111 are arranged to connect with the electrodes to realize the current transmission between the adjacent battery pieces 10. Specifically, the comb-tooth unit 111 may be connected to the first electrode 1011 or may be connected to the second electrode 1021, wherein the comb-tooth unit 111 disposed in the comb-teeth on the same side of the body is connected to the same electrode on the same cell piece 10. The width of the comb-tooth unit 111 along the first direction is a, the adjacent first electrodes 1011 and second electrodes 1021 on the same cell piece 10 are uniformly spaced, and the spacing distance between the adjacent first electrodes 1011 and second electrodes 1021 on the same cell piece 10 is Z. In the embodiment of the present application, the width of the comb-tooth unit 111 in the first direction is equal to twice the interval between the adjacent first electrode 1011 and second electrode 1021 on the same cell piece 10, that is, a =2Z. Therefore, when actually mounting and connecting the battery module, no matter the comb-tooth unit 111 is disposed at any position along the first direction, the width of the comb-tooth unit 111 along the first direction is equal to twice the width of the adjacent first electrode 1011 and second electrode 1021 on the same cell piece 10 along the first direction, under the limitation of the width of the comb-tooth unit 111 along the first direction. That is to say, the connection with the first electrode 1011 or the second electrode 1021 on the battery piece 10 can be realized through the comb unit 111, and then the current transmission between the adjacent battery pieces 10 is realized, and according to the limitation on the width of the comb unit 111 along the first direction, the current transmission between the two adjacent battery pieces 10 can be realized through the connection between the comb unit 111 and the first electrode 1011 or the second electrode 1021, and simultaneously, the connection with the electrodes of different polarities on the same battery piece 10 can also be avoided through the comb unit 111, and then the short circuit problem is avoided, so that the insulating layer for preventing the short circuit phenomenon is not required to be arranged between the battery piece 10 and the comb unit 111, and the arrangement of the insulating layer in the original battery assembly is reduced. Therefore, it is also no longer necessary to make a hole in the insulating layer and to perform welding between the comb tooth unit 111 and the electrode after the hole is made. But can directly realize the connection between broach unit 111 and the electrode, when realizing current transmission, have the beneficial effect that reduces processing technology step, reduces the required precision of encapsulation technology, improves battery pack machining efficiency.
Further, when the width of the comb-tooth unit 111 in the first direction is equal to twice the interval between the adjacent first electrode 1011 and second electrode 1021 on the same cell piece 10, i.e., a =2Z. Any one comb tooth unit 111 is disposed between any two adjacent electrodes with the same polarity on the same cell piece 10, the outer side of the comb tooth unit 111 contacts any two adjacent electrodes with the same polarity on the same cell piece 10, and the comb tooth unit 111 is connected to one of any two adjacent electrodes with the same polarity on the same cell piece 10.
Optionally, in the embodiment of the present application, any one comb tooth unit 111 includes one convex portion 1111 and one gap portion 1112, the convex portion 1111 is connected to the first electrode 1011, or the convex portion 1111 is connected to the second electrode 1021, the gap portion 1112 is a gap between two adjacent convex portions 1111 along the first direction, and the gap portion 1112 is located between any two adjacent electrodes with the same polarity along the first direction; the width of the convex portion 1111 in the first direction is Y; the width of the gap 1112 in the first direction is B; wherein Y + B = a.
In the embodiment of the present application, the comb tooth unit 111 includes a protrusion 1111 and a gap portion 1112, the protrusion 1111 is configured to be connected to the first electrode 1011, or the protrusion 1111 is configured to be connected to the second electrode 1021, and the plurality of protrusions 1111 are configured to be connected to the upper electrode of the battery piece 10, so as to transmit current between the battery pieces 10. The gap portion 1112 is a gap between any two of the protruding portions 1111, in practical applications, the gap portion 1112 generates a recess in the second direction toward the main body, the gap portion 1112 is disposed between two adjacent protruding portions 1111 in the first direction, the gap portion 1112 is disposed to realize a space between two adjacent protruding portions 1111, and meanwhile, when the adjacent protruding portions 1111 are connected to the first electrode 1011 or the second electrode 1021, the recess portion 1112 generated in the main body direction is disposed to avoid the second electrode 1021 or the first electrode 1011, so as to avoid the short circuit caused by the connection of the comb tooth unit 111 and the electrode with opposite polarity. The width of the protruding portion 1111 in the first direction is Y, and it should be noted that the width Y is the width at the connection portion of the protruding portion 1111 and the main body, and the width Y here is the maximum width of the protruding portion. The width of the gap 1112 in the first direction is B, which is the width of the gap closest to the main body, and the width B is the maximum width of the gap. The width of the convex portion 1111 in the first direction and the width of the gap portion 1112 in the first direction are added to the width of the comb tooth unit 111 in the first direction, that is, Y + B = a. In the embodiment of the application, through the arrangement of the protrusion 1111 and the gap portion 1112 in the comb tooth unit 111, when the protrusion 1111 is connected with an electrode, the gap portion 1112 avoids the connection with the electrode having the opposite polarity to the electrode connected with the protrusion 1111, so as to prevent the occurrence of a short circuit, and therefore, an insulating layer for preventing the short circuit phenomenon is not required to be arranged between the cell piece 10 and the comb tooth unit 111, and the arrangement of the insulating layer in the primary cell assembly can be reduced. Therefore, it is also no longer necessary to make a hole in the insulating layer and to perform welding between the comb tooth unit 111 and the electrode after the hole is made. But can directly realize the connection between bellying 1111 and the electrode, when realizing current transmission, have the beneficial effect that reduces the processing technology step, reduces the required precision of encapsulation technology, improves battery pack machining efficiency.
Further, the length of the protrusion 1111 extends in the second direction toward the electrode to be connected, so that the connection member 11 forms a concave-convex structure near both sides of the electrode, and the protrusion 1111 protrudes toward the electrode to be connected, and accordingly, there are electrodes having opposite polarity to the electrode to be connected and not connected to the protrusion 1111 on both sides of the electrode to be connected, which correspond to the position of the gap portion 1112 in the second direction. When the connection member 11 is connected to the electrode to be connected, the gap portion 1112 prevents the connection of the electrode having the opposite polarity to the projection 1111 while the projection 1111 is connected to the electrode to be connected. Specifically, when the protrusion 1111 is connected to the first electrode 1011, the second electrode 1021 adjacent to the first electrode 1011 corresponds to the position of the gap 1112, or when the protrusion 1111 is connected to the second electrode 1021, the first electrode 1011 adjacent to the second electrode 1021 corresponds to the position of the gap 1112, and the gap 1112 is provided to prevent the occurrence of the short circuit phenomenon.
It should be noted that the protruding portion 1111 may be formed into a closed figure by one or more of a line segment, a chamfer, an arc, and the like. The size of the protrusion 1111 may be designed according to the size of the battery and the position of the electrode, which is not limited in this embodiment. In addition, even in the same battery pack, the shape and area of the protruding portion 1111 in different connection units may be different, and the current transmission between the connection member 11 and the battery cell 10 may be achieved without causing a short circuit phenomenon, including the whole connection member 11, the half connection member 11, the three-divided connection member 11, and the like, which is not limited in this embodiment.
Optionally, in the embodiment of the present application, the width of the first electrode 1011 or the second electrode 1021 in the first direction is C; wherein C is less than or equal to B, and Y + B =2Z-2C.
In the embodiment of the present application, as mentioned above, the electrodes on the battery piece 10 are interdigital electrodes, and have an electrode with a periodic pattern in a face, such as a finger or comb, wherein the electrodes are alternately disposed in a positive and negative manner, that is, the first electrode 1011 and the second electrode 1021 have opposite polarities and are alternately disposed. The first electrodes 1011 and the second electrodes 1021 are alternately arranged in any cell piece 10, wherein the width of the first electrodes 1011 or the second electrodes 1021 in the first direction is C, and C is less than or equal to B. In practical applications, the width of the first electrode 1011 or the second electrode 1021 in the first direction is less than or equal to the width of the gap portion 1112 in the first direction, and it can be understood that when the connection member 11 and the battery piece 10 are connected to realize the current transmission between the battery pieces 10, the protrusion 1111 in the comb tooth unit 111 is connected to the first electrode 1011 or the second electrode 1021, and the gap portion 1112 in the comb tooth unit 111 is used to avoid the contact between the comb tooth unit 111 and the second electrode 1021 or the first electrode 1011 (where the second electrode 1021 and the first electrode 1011 are adjacent to the electrode connected to the protrusion 1111 and have opposite polarities). Further, since the widths of the first electrode 1011 and the second electrode 1021 in the first direction are less than or equal to the width of the gap portion 1112 in the first direction, the gap portion 1112 can completely contain the width of the electrode in the first direction within the width range of the gap portion 1112 in the first direction, which has the beneficial effect of avoiding short circuit caused by contact between the electrode and the connecting member 11. In addition, because the width of the gap part 1112 in the first direction is greater than or equal to the width of the electrode in the first direction, the short circuit problem is avoided, so that an insulating layer for preventing the short circuit phenomenon is not required to be arranged between the battery piece 10 and the connecting piece 11, and the arrangement of the insulating layer in the original battery assembly can be reduced. Further, it is not necessary to make a hole in the insulating layer and to perform welding between the boss 1111 and the electrode after the hole is made. But can directly realize the connection between bellying 1111 and the electrode, when realizing current transmission, have the beneficial effect that reduces the processing technology step, reduces the required precision of encapsulation technology, improves battery pack machining efficiency.
Further, a width of the protrusion 1111 in the first direction is Y, a width of the gap portion 1112 in the first direction is B, and widths of the protrusion 1111 and the gap portion 1112 in the first direction are Y + B. The width of any two adjacent electrodes with the same polarity on the same cell piece 10 along the first direction is 2Z, the width of any electrode along the first direction is C, and the actual distance between any two adjacent electrodes with the same polarity after subtracting the widths of the two electrodes along the first direction is 2Z-2C.
When Y + B =2Z-2C, the outer side of the comb tooth unit 111 contacts any two adjacent electrodes having the same polarity on the same one of the battery pieces 10, the projection 1111 contacts one of any two adjacent electrodes having the same polarity on the same one of the battery pieces 10, and the gap portion 1112 contacts the other of any two adjacent electrodes having the same polarity on the same one of the battery pieces 10. At this time, the comb-teeth unit 111 is connected to one of any two adjacent electrodes having the same polarity on the same cell piece 10.
Optionally, in the embodiment of the present application, the length of the protruding portion 1111 in the second direction is L, and L ≦ 5mm.
In the embodiment of the present application, the protruding portion 1111 has a length L along the second direction, wherein the length L is related to the arrangement position of two adjacent battery pieces 10, and in practical application, the length L is positively related to the gap between two adjacent battery pieces 10. In practical application, all be provided with the welding point on the electrode, realize being connected of electrode and connecting piece 11 through being connected between welding point and bellying 1111, the distance between the welding point that sets up on the first electrode 1011 and the welding point that sets up on the second electrode 1021 can be as wide as the width of body along the second direction. Length L can exceed the welding point position and extend along the second direction and be no longer than 5mm, and is concrete, and the bellying 1111 that sets up in the broach of body both sides all can extend along the second direction to the direction of keeping away from the body and be no longer than 5mm. In this application embodiment, through to the length setting of bellying 1111 along the second direction to the direction that deviates from the body, separate bellying 1111 and body, help welding position's affirmation, have the welding of being convenient for, simplify welding process, improve battery pack production efficiency's beneficial effect.
The thickness of the connecting member 11 may be set to be in a range of 10 μm to 120 μm.
It should be noted that, by limiting the length range, the width range and the thickness range of the connecting member 11, the connecting member 11 can be fully utilized without increasing the length of the current transmission path, which has the advantages of reducing the material cost of the battery assembly and reducing the electrical loss during the current transmission process.
Optionally, in the embodiment of the present application, the length of the connecting member 11 in the first direction is less than or equal to the length of the battery piece 10 in the first direction.
In the embodiment of the present application, the length of the connecting member 11 in the first direction is related to the length of the battery piece 10, the length of the connecting member 11 may be the same as the length of the battery piece 10, and the length of the connecting member 11 may also be smaller than the length of the battery piece 10. The length of the connecting piece 11 along the first direction is less than or equal to the length of the battery piece 10 along the first direction, and the battery piece 10 can completely cover the connecting piece 11 along the direction perpendicular to the battery integration back plate 12, so that the defect that the connecting piece 11 is exposed out of the battery piece 10 is effectively avoided. There is an advantageous effect of preventing the contact between the connection member 11 and the adjacent connection member 11 from causing a short circuit.
Optionally, in this embodiment of the application, the battery module further includes a battery integration rear panel 12, a protection layer, and an adhesive layer, the battery integration rear panel 12 is disposed on one side of the plurality of connecting members 11 away from the battery sheet 10, the protection layer is disposed on one side of the plurality of connecting members 11 close to the battery sheet 10, and the adhesive layer is sandwiched between the plurality of connecting members 11 and the battery integration rear panel 12.
In this embodiment, the battery integration back plate 12 is arranged to support the connecting members 11, the adhesive layer is arranged to connect the connecting members 11 to the battery integration back plate 12, and the connecting members 11 may be arranged in an even array on the battery integration back plate 12. The arrangement of the connecting pieces 11 in an array is used for arranging the battery pieces 10 as many as possible under the condition of the battery integration back plates 12 with the same area and the battery pieces 10 with the same model, so that the light conversion efficiency can be effectively improved. The protective layer is disposed on one side of the connecting member 11 close to the battery piece 10. In practical applications, the battery piece 10 is a transparent member, and the protective layer is disposed to prevent the color of the connecting member 11 from being observed through the transparent battery piece 10 from the outside, so that the protective layer is disposed on the side of the connecting member 11 close to the battery piece 10 for appearance treatment. Specifically, the connector 11 may be protected from the outside by adding a coating, or may be protected from the outside by adding a structure such as a protective film. The color of the protection layer may include black, white, etc., which may prevent the metal color between the battery pieces 10 from being observed, and this embodiment does not limit this.
Further, the battery pack can further comprise a packaging assembly, the packaging assembly is arranged oppositely to clamp the battery pack in the packaging assembly, so that the battery pack is protected, the packaging assembly can be made of glass or transparent resin, and the battery pack is not limited in this embodiment.
It should be noted that, the material of the protective layer may be any one of POE, EVA, EPE, acrylic resin, epoxy resin, and UV resin, and the protective layer made of the above materials can avoid the metal color between the battery pieces 10 from being observed, and can also realize the connection between the battery pieces 10 and the connecting member 11.
It should be further noted that the adhesive layer can be selected from any one of the photovoltaic module encapsulating materials, such as EVA, POE, EPE, and PVB, which is not limited in this embodiment.
Optionally, in this embodiment of the application, the plurality of connecting members 11 are uniformly arranged in an array, the plurality of connecting members 11 are arranged along the second direction to form connecting strings, and a first preset distance F is provided between two adjacent connecting strings; the plurality of battery pieces 10 are arranged along a second direction to form battery strings, and a second preset distance f is arranged between every two adjacent battery strings; wherein F is more than or equal to F.
In the embodiment of the present application, the plurality of connecting members 11 are arranged on the battery integration back plate 12 to realize current transmission between the plurality of battery pieces 10, the plurality of connecting members 11 are arranged along the second direction to form a connecting string, and a first preset distance F is arranged between two adjacent connecting strings. The plurality of battery pieces 10 are arranged on the battery integration back plate 12 to realize photoelectric conversion, the plurality of battery pieces 10 are arranged along a second direction to form battery strings, and a second preset distance f is arranged between every two adjacent battery strings. The first preset distance F between two adjacent connection strings is greater than or equal to the second preset distance F between two adjacent battery strings, that is, the battery piece 10 at least completely covers the connecting piece 11 along the first direction.
It should also be noted that the first preset distance F between adjacent connection strings provides a deformation space for the deformation of the connection member 11 caused by the temperature influence, and has the beneficial effect of improving the temperature change resistance of the assembly.
Alternatively, in the present embodiment, the connection member 11 is a conductive metal material including one or more of Cu, al, ni, zn, sn, ag, and Bi.
In the embodiment of the present application, the connection member 11 is composed of one or more of a plurality of conductive metal materials, wherein the conductive metal material may be Cu, al, ni, zn, sn, ag, bi, or the like. The connecting member 11 may be formed by a single conductive metal material, an alloy processed by two conductive metal materials, such as a copper-zinc alloy, a silver-copper alloy, and the like, or a composite metal processed by three or more conductive metal materials, which is not limited in this embodiment.
Optionally, in an embodiment of the present application, there is also provided a battery system including the battery assembly as described above.
In the embodiment of the present application, the battery system includes at least one battery assembly as described above, and the current transmission between the battery pieces 10 is realized by disposing a plurality of connecting members 11 in a uniform matrix arrangement and independent of each other on the battery integration back plate 12. The connecting piece 11 includes body and broach, and the body sets up between arbitrary two adjacent battery pieces 10 along the first direction, and the broach sets up in the both sides of body along the first direction, and the setting of connecting piece 11 is used for being connected with the battery piece 10 that sets up in connecting piece 11 both sides to realize the current transmission between the battery piece 10 of connecting piece 11 both sides. Specifically, the connection member 11 may be connected to the first electrode 1011 of one of the two adjacent battery cells 10 and may be connected to the second electrode 1021 of the other one of the two adjacent battery cells 10. Alternatively, the connection member 11 may be connected to the second electrode 1021 of one of the two adjacent battery sheets 10, and may be connected to the first electrode 1011 of the other of the two adjacent battery sheets 10. The connecting piece 11 and two adjacent battery pieces 10 are respectively connected through the opposite electrodes, so that the current transmission between each battery piece 10 and the next battery piece 10 is realized. In the embodiment of the application, through being connected respectively of the opposite polarity electrode on broach on the connecting piece 11 and two adjacent battery pieces 10, can realize the current transmission between two adjacent battery pieces 10, simultaneously, can avoid at body one side broach with the same battery piece 10 on the electrode connection of different polarities, and then the short circuit problem can not appear, consequently no longer need set up the insulating layer that is used for preventing to cause the short circuit phenomenon between battery piece 10 and the connecting piece 11, can reduce the setting of insulating layer among the primary battery subassembly. It is therefore also no longer necessary to make holes in the insulating layer and to perform welding between the connecting elements 11 and the electrodes after the holes have been made. But can directly realize the connection between connecting piece 11 and the electrode, when realizing current transmission, have the beneficial effect that reduces the processing technology step, reduces the required precision of encapsulation technology, improves battery pack machining efficiency.
In addition, the arrangement of the plurality of connecting pieces 11 realizes current transmission between the battery pieces 10, and simultaneously reduces the overlapping area between the metal connecting layer and the battery pieces 10, so that the current transmission path between the battery pieces 10 is shortened, the electrical loss of the current transmitted in the connecting pieces 11 is reduced, and the beneficial effect of improving the light energy conversion efficiency of the battery assembly is achieved. Furthermore, the area of the metal connecting layer is reduced, namely the metal consumption of the metal connecting layer is reduced, so that the manufacturing cost of the battery component is reduced. In addition, because the connecting piece 11 is arranged, an insulating layer is not required to be arranged, the punching process with high processing precision requirement and large processing quantity on the insulating layer is not required, and the processing efficiency of the battery pack is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions recited, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.
Claims (10)
1. A battery assembly, comprising:
the battery plates comprise electrodes arranged along the second direction, the electrodes comprise first electrodes and second electrodes, and the first electrodes and the second electrodes are alternately arranged at intervals along the first direction;
the connecting piece comprises a body and comb teeth, the body is arranged between any two adjacent battery pieces along the first direction, and the comb teeth are arranged on two sides of the body along the first direction;
the comb teeth on one side of the body are connected with the first electrode of one of the two adjacent battery pieces, and the comb teeth on the other side of the body are connected with the second electrode of the other one of the two adjacent battery pieces, so that current transmission between the two adjacent battery pieces is realized;
wherein the first direction and the second direction are perpendicular, and the first electrode and the second electrode have opposite polarities.
2. The battery module according to claim 1, wherein the comb teeth include a plurality of comb tooth units, the comb tooth units being connected to the first electrode or the comb tooth units being connected to the second electrode, the comb tooth units having a width a in the first direction;
the adjacent first electrodes and the adjacent second electrodes on the same battery piece are uniformly spaced, and the spacing distance between the adjacent first electrodes and the adjacent second electrodes is Z;
wherein a =2Z.
3. The battery module according to claim 2, wherein any one of the comb-tooth units comprises a protrusion connected to the first electrode or a gap connected to the second electrode, the gap being a gap between two adjacent protrusions along the first direction, and the gap being located between any two adjacent electrodes having the same polarity along the first direction;
the width of the protruding part along the first direction is Y; the width of the gap part along the first direction is B;
wherein Y + B = a.
4. The battery assembly of claim 3, wherein the first electrode or the second electrode has a width C along the first direction;
wherein C is less than or equal to B, and Y + B =2Z-2C.
5. The battery pack of claim 4, wherein the length of the protrusion in the second direction is L ≦ 5mm.
6. The battery assembly of claim 5, wherein the length of the connector in the first direction is less than or equal to the length of the battery piece in the first direction.
7. The battery module according to claim 6, further comprising a battery integration rear panel, a protection layer and an adhesive layer, wherein the battery integration rear panel is disposed on one side of the plurality of connecting members away from the battery piece, the protection layer is disposed on one side of the plurality of connecting members close to the battery piece, and the adhesive layer is sandwiched between the plurality of connecting members and the battery integration rear panel.
8. The battery pack according to claim 7, wherein a plurality of the connecting members are arranged in a uniform array, a plurality of the connecting members are arranged along the second direction to form connecting strings, and a first preset distance F is provided between two adjacent connecting strings;
the plurality of battery pieces are arranged along the second direction to form battery strings, and a second preset distance f is arranged between every two adjacent battery strings;
wherein F is more than or equal to F.
9. The battery assembly of claim 1, wherein the connector is a conductive metal material comprising one or more of Cu, al, ni, zn, sn, ag, and Bi.
10. A battery system comprising the battery assembly according to any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211125405.9A CN115632073A (en) | 2022-09-15 | 2022-09-15 | Battery pack and battery system |
| PCT/CN2023/105708 WO2024055725A1 (en) | 2022-09-15 | 2023-07-04 | Battery assembly and battery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211125405.9A CN115632073A (en) | 2022-09-15 | 2022-09-15 | Battery pack and battery system |
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| CN115632073A true CN115632073A (en) | 2023-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211125405.9A Pending CN115632073A (en) | 2022-09-15 | 2022-09-15 | Battery pack and battery system |
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| Country | Link |
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| CN (1) | CN115632073A (en) |
| WO (1) | WO2024055725A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024055725A1 (en) * | 2022-09-15 | 2024-03-21 | 泰州隆基乐叶光伏科技有限公司 | Battery assembly and battery system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594533A (en) * | 2013-11-26 | 2014-02-19 | 合肥海润光伏科技有限公司 | Back-contact back-junction solar battery three-dimension electrode and manufacturing method thereof |
| KR20150100146A (en) * | 2014-02-24 | 2015-09-02 | 엘지전자 주식회사 | Solar cell module |
| CN111599885A (en) * | 2020-06-10 | 2020-08-28 | 晶澳（扬州）太阳能科技有限公司 | Solar cell module and preparation method |
| CN113611766B (en) * | 2021-06-30 | 2023-03-21 | 泰州隆基乐叶光伏科技有限公司 | Solar cell module and preparation method thereof |
| CN115632073A (en) * | 2022-09-15 | 2023-01-20 | 泰州隆基乐叶光伏科技有限公司 | Battery pack and battery system |
-
2022
- 2022-09-15 CN CN202211125405.9A patent/CN115632073A/en active Pending
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2023
- 2023-07-04 WO PCT/CN2023/105708 patent/WO2024055725A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024055725A1 (en) * | 2022-09-15 | 2024-03-21 | 泰州隆基乐叶光伏科技有限公司 | Battery assembly and battery system |
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