CN111916643B - A battery cell assembly and a battery pack - Google Patents

A battery cell assembly and a battery pack Download PDF

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Publication number
CN111916643B
CN111916643B CN202010743817.3A CN202010743817A CN111916643B CN 111916643 B CN111916643 B CN 111916643B CN 202010743817 A CN202010743817 A CN 202010743817A CN 111916643 B CN111916643 B CN 111916643B
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China
Prior art keywords
battery cell
conductive layer
electrode tab
battery
cell
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CN202010743817.3A
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Chinese (zh)
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CN111916643A (en
Inventor
许杰城
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Zhejiang Guanyu Power Supply Co ltd
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Zhuhai Cosmx Power Battery Co Ltd
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Priority to CN202010743817.3A priority Critical patent/CN111916643B/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention provides a battery cell assembly and a battery pack, wherein the battery cell assembly comprises N battery cells which are stacked, and the N battery cells are sequentially and fixedly connected; the first electric core and the second electric core are electrically connected in series through the series plates; the serial connection plate is provided with a first conductive layer and a second conductive layer, the first conductive layer is electrically connected with the second conductive layer, the positive electrode tab of the first electric core is fixedly and electrically connected with the first conductive layer, and the negative electrode tab of the second electric core is fixedly and electrically connected with the second conductive layer; the material of the first conductive layer is the same as the material of the positive electrode tab of the first electric core, and the material of the second conductive layer is the same as the material of the negative electrode tab of the second electric core; the first electric core and the second electric core are any two adjacent electric cores in the N electric cores; n is a positive integer greater than 1. The embodiment of the invention reduces the production cost of the battery cell assembly.

Description

Battery cell assembly and battery pack
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cell assembly and a battery pack.
Background
From the development of markets at home and abroad, the market share of the soft package polymer lithium ion battery is continuously improved. The diversified serial-parallel combination mode also provides higher requirements for welding the battery cell electrode lugs and the acquisition connecting plate.
For the cell assembly in the existing battery pack, due to the battery property, the positive electrode tab of each cell in the cell assembly is made of aluminum, the negative electrode tab is made of copper, when two cells in the cell assembly are electrically connected in series, the positive electrode tab of one cell needs to be electrically connected with the negative electrode tab of the other cell, and due to the different properties of copper and aluminum, copper and aluminum cannot be directly welded. In the prior art, the aluminum of the positive electrode tab is generally converted into nickel, then the nickel tab is welded with one side of a bus plate made of metal nickel, and the positive electrode tab is welded with the other side of the bus plate. Therefore, in the prior art, the connecting structure in the battery cell assembly is complex, and the production cost is high.
Disclosure of Invention
The embodiment of the invention provides a battery cell assembly and a battery pack, which are used for solving the problems of complex connection structure and higher production cost of the battery cell assembly in the prior art.
In a first aspect, an embodiment of the present invention provides a battery cell assembly, including:
The N battery cores are fixedly connected in sequence;
The first electric core and the second electric core are electrically connected in series through the series plates; the serial connection plate is provided with a first conductive layer and a second conductive layer, the first conductive layer is in conductive connection with the second conductive layer, the positive electrode tab of the first electric core is fixed and in conductive connection with the first conductive layer, and the negative electrode tab of the second electric core is fixed and in conductive connection with the second conductive layer;
The material of the first conductive layer is the same as the material of the positive electrode tab of the first electric core, and the material of the second conductive layer is the same as the material of the negative electrode tab of the second electric core; the first electric core and the second electric core are any two adjacent electric cores in the N electric cores; n is a positive integer greater than 1.
Optionally, the battery cell assembly further includes a first side plate and a second side plate, the first side plate is fixedly connected with one side of the N battery cells, and the second side plate is fixedly connected with the other side opposite to the N battery cells;
The first side plate is fixedly connected with the second side plate through a screw rod, and the first side plate and the second side plate are clamped and fixed with the N electric cores.
Optionally, the battery cell assembly further includes M battery cell brackets, where the battery cell brackets are located between the first battery cell and the second battery cell and are fixedly connected with the first battery cell and the second battery cell respectively; m is a positive integer greater than 1.
Optionally, the electric core support includes first mounting, second mounting and fixed plate, first mounting with the second mounting set up respectively in the both ends of fixed plate, and with fixed plate fixed connection.
Optionally, the screw rod includes first screw rod and second screw rod, in the M electric core support first mounting all with first screw rod fixed connection, in the M electric core support second mounting all with second screw rod fixed connection.
Optionally, the positive electrode tab and the negative electrode tab of each battery cell are respectively located at two ends of the battery cell;
the positive electrode tab of the first battery cell comprises a first bending part, and the negative electrode tab of the second battery cell comprises a second bending part; the first bending part is fixedly attached to the first conductive layer, and the second bending part is fixedly attached to the second conductive layer.
Optionally, the first bending part is attached to and fixed to the first conductive layer through laser welding, and the second bending part is attached to and fixed to the second conductive layer through laser welding.
Optionally, the positive electrode tab of the first electric core is made of aluminum, and the negative electrode tab of the second electric core is made of copper.
Optionally, the first electric core and the second electric core are respectively adhered to the fixing plate through glue.
In a second aspect, an embodiment of the present disclosure provides a battery pack including the electrical core assembly according to any one of the embodiments above.
According to the invention, the first conductive layer and the second conductive layer are arranged on the serial connection plate in the battery cell assembly, and for the first battery cell and the second battery cell which are adjacently arranged, the positive electrode lug of the first battery cell is fixedly and conductively connected with the first conductive layer, the negative electrode lug of the second battery cell is fixedly and conductively connected with the second conductive layer, the material of the first conductive layer is the same as that of the positive electrode lug of the first battery cell, and the material of the second conductive layer is the same as that of the negative electrode lug of the second battery cell, so that the transfer of the lugs is not needed, the connection structure of the battery cell assembly is simplified, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery cell assembly according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a serial board according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of a first battery cell and a second battery cell with a battery cell bracket according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
Referring to fig. 1 to 3, in a first aspect, an embodiment of the present invention provides a battery cell assembly, including:
the battery comprises N stacked battery cells 10, wherein the N battery cells 10 are sequentially and fixedly connected;
The first battery cell 11 and the second battery cell 12 are electrically connected in series through a serial connection plate 20; the series plate 20 is provided with a first conductive layer 21 and a second conductive layer 22, the first conductive layer 21 is electrically connected with the second conductive layer 22, the positive electrode tab of the first electric core 11 is fixedly and electrically connected with the first conductive layer 21, and the negative electrode tab of the second electric core 12 is fixedly and electrically connected with the second conductive layer 22;
The material of the first conductive layer 21 is the same as the material of the positive electrode tab of the first battery cell 11, and the material of the second conductive layer 22 is the same as the material of the negative electrode tab of the second battery cell 12; the first electric core 11 and the second electric core 12 are any two adjacent electric cores 10 in the N electric cores 10; n is a positive integer greater than 1.
In the embodiment of the invention, the battery cell assembly is an important component part in the soft package of the lithium ion battery pack, and the battery cell assembly is electrically connected with other electronic components through a wire or a bus plate, so that the soft package of the lithium ion battery pack can be obtained. In order to meet specific power supply requirements, the above-mentioned battery cell assembly often includes N electrically connected battery cells 10, where the series connection of multiple battery cells 10 can raise the power supply voltage of the battery cell assembly, and the parallel connection can raise the current and the capacity of the battery cell assembly. The battery cell assembly of the embodiment of the invention can adopt N battery cells 10 which are electrically connected in series, and the number of the battery cells can be specifically set according to the required power supply voltage.
For the N cells 10, a cuboid may be stacked, where two adjacent cells 10 are fixedly connected in sequence. The serial connection between two adjacent cells 10 may be achieved by electrically connecting the positive electrode tab of the first cell 11 and the negative electrode tab of the second cell 12 through a serial connection board 20.
For each cell 10, the positive tab may be made of aluminum and the negative tab may be made of copper. In order to enable the positive electrode tab in the first electrical core 11 to be electrically connected with the negative electrode tab in the second electrical core 12, the series plate 20 may be a metal plate, and is provided with a first conductive layer 21 and a second conductive layer 22, where the first conductive layer 21 is made of the same material as the positive electrode tab, and the second conductive layer 22 is made of the same material as the negative electrode tab, and specific materials thereof may be set according to the tab materials. Therefore, the positive electrode tab, such as an aluminum tab, is directly electrically connected with the aluminum conductive layer, and the negative electrode tab, such as a copper tab, is directly electrically connected with the copper conductive layer. It should be appreciated that in other embodiments, the series plate 20 may also be made of a copper aluminum composite.
Meanwhile, the positional relationship between the first conductive layer and the second conductive layer on the serial plate 20 may be set according to actual needs, that is, the serial plate 20 may have an upper layer of aluminum, a lower layer of copper, or a lower layer of aluminum, and an upper layer of copper, which is not limited herein.
According to the invention, the first conductive layer 21 and the second conductive layer 22 are arranged on the serial plate 20 in the battery cell assembly, and for the first battery cell 11 and the second battery cell 12 which are adjacently arranged, the positive electrode tab of the first battery cell 11 is fixedly and conductively connected with the first conductive layer 21, the negative electrode tab of the second battery cell 12 is fixedly and conductively connected with the second conductive layer 22, the material of the first conductive layer 21 is the same as the material of the positive electrode tab of the first battery cell 11, and the material of the second conductive layer 22 is the same as the material of the negative electrode tab of the second battery cell 12, so that the transfer of the tabs is not needed, the connection structure of the battery cell assembly is simplified, and the cost is reduced.
Further, the battery cell assembly may further include a first side plate and a second side plate, where the first side plate is fixedly connected to one side of the N battery cells 10, and the second side plate is fixedly connected to the other side opposite to the N battery cells 10;
the first side plate and the second side plate are fixedly connected through a screw rod, and the first side plate and the second side plate clamp and fix the N electric cores 10.
The materials of the first side plate and the second side plate may be set according to actual needs, and in the embodiment of the present invention, the first side plate and the second side plate may be steel plates.
According to the embodiment of the invention, the first side plate and the second side plate are arranged, the screw holes can be formed in the two ends of the first side plate and the second side plate, and the screw rods and the screw holes are matched and fixed, so that the N electric cores 10 can be protected, the expansion degree of the electric cores 10 can be limited when the electric cores 10 are expanded, and the safety of the electric core assembly is improved.
Further, the above-mentioned battery cell assembly also includes M battery cell brackets 30, the above-mentioned battery cell bracket 30 locates between above-mentioned first battery cell 11 and above-mentioned second battery cell 12, and fixedly connect with above-mentioned first battery cell 11 and above-mentioned second battery cell 12 separately; m is a positive integer greater than 1.
It should be understood that the number M of cell holders 30 described above is determined by the number N of cells 10. For example, in one embodiment, when N is an even number, M may be N/2.
The positive electrode tab of the first battery cell 11 and the negative electrode tab of the second battery cell 12 may be located at the same end so as to be electrically connected.
The battery cell bracket 30 includes a first fixing member 31, a second fixing member 32, and a fixing plate 33, where the first fixing member 31 and the second fixing member 32 are respectively disposed at two ends of the fixing plate 33 and are fixedly connected with the fixing plate 33.
In the embodiment of the present invention, the battery cell support 30 may be a rectangular frame with fixing members at two ends and flanges, the first battery cell 11 and the second battery cell 12 may be respectively disposed at two sides of the rectangular frame, and meanwhile, the positive electrode tab and the negative electrode tab may be respectively and fixedly connected with the first fixing member 31 and the second fixing member 32, so as to facilitate the electrical connection between the first battery cell 11 and the second battery cell 12.
The materials of the first fixing member 31, the second fixing member 32 and the fixing plate 33 may be set according to actual needs. In one embodiment, the first fixing member 31, the second fixing member 32 and the fixing plate 33 may be made of aluminum. In other embodiments, the first fixing member 31, the second fixing member 32, and the fixing plate 33 may be made of other metal materials. Meanwhile, the first fixing member 31 and the second fixing member 32 may be fixedly connected to the fixing plate 33 by welding.
Specifically, the screw includes a first screw and a second screw, the first fixing pieces 31 in the M electrical core holders 30 are fixedly connected with the first screw, and the second fixing pieces 32 in the M electrical core holders 30 are fixedly connected with the second screw.
In this embodiment of the present invention, screw holes may be formed at both ends of the M cell holders 30, and the first screw rod and the second screw rod respectively pass through the screw holes at both ends of the M cell holders 30, so that the M cell holders 30 are fixed between the first side plate and the second side plate.
Further, in order to facilitate the arrangement of the battery cell support and the battery cell and the electrical connection between the positive and negative tabs of the battery cell and the serial connection board, in the embodiment of the present invention, the positive tab and the negative tab of each battery cell 10 may be located at two ends of the battery cell 10, respectively. It should be understood that, in other embodiments, the positive electrode tab and the negative electrode tab of the above-mentioned battery cell 10 may also be located at the same end of the above-mentioned battery cell, and may be specifically determined according to actual needs.
The positive electrode tab of the first battery cell 11 includes a first bending portion, and the negative electrode tab of the second battery cell 12 includes a second bending portion; the first bending portion is bonded to the first conductive layer 21, and the second bending portion is bonded to the second conductive layer 22.
Specifically, the first bending portion and the first conductive layer 21 may be bonded and fixed by laser welding. Correspondingly, the second bending part and the second conductive layer 22 can be attached and fixed by laser welding.
Further, the positive electrode tab of the first cell 11 is made of aluminum, and the negative electrode tab of the second cell 12 is made of copper.
Further, the first battery cell 11 and the second battery cell 12 are respectively adhered to the fixing plate 33 by glue.
A foam may be further disposed between the first cell 11 and the fixing plate 33, and the first cell 11 may be bonded to the fixing plate 33 by applying glue to both sides of the foam. Correspondingly, foam may be disposed between the second battery cell 12 and the fixing plate 33.
Referring to fig. 1 and fig. 3 together, a specific installation procedure of the battery cell assembly provided by the embodiment of the present invention may be as follows:
For one end of the above-mentioned cell assembly, the negative electrode tab of the above-mentioned first cell 11 is welded to the red copper conductive layer of the serial plate 20 and then bent, and then the combined structure of the first cell 11 and the serial plate 20 is clamped into the above-mentioned cell bracket 30.
The second battery cell 12 is engaged with the battery cell holder 30, the positive electrode tab of the second battery cell 12 is bent, and the bent portion is welded to the aluminum conductive layer of the serial plate 20.
And the other end of the battery cell assembly adopts a mode consistent with the steps of the method, so that the lamination arrangement of a plurality of battery cells is realized.
In a second aspect, an embodiment of the present invention further provides a battery pack, including the above-mentioned battery cell assembly.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (6)

1. The battery cell assembly is characterized by comprising N battery cells which are arranged in a stacked manner, wherein the N battery cells are sequentially and fixedly connected;
The positive electrode tab and the negative electrode tab of each battery cell are respectively positioned at two ends of the battery cell, two adjacent battery cells are a first battery cell and a second battery cell, the positive electrode tab of the first battery cell and the negative electrode tab of the second battery cell are positioned at the same end, or the negative electrode tab of the first battery cell and the positive electrode tab of the second battery cell are positioned at the same end, the positive electrode tab and the negative electrode tab are electrically connected in series through a series connection plate, and the series connection plate is arranged at two ends of the battery cell; the serial connection plate is a metal plate, a first conductive layer and a second conductive layer are arranged on the serial connection plate, the first conductive layer and the second conductive layer are distributed up and down, the first conductive layer is in conductive connection with the second conductive layer, a positive electrode tab of the first electric core is fixed with the first conductive layer and is in conductive connection with the first conductive layer, and a negative electrode tab of the second electric core is fixed with the second conductive layer and is in conductive connection with the second conductive layer;
The material of the first conductive layer is the same as the material of the positive electrode tab of the first electric core, and the material of the second conductive layer is the same as the material of the negative electrode tab of the second electric core; the first electric core and the second electric core are any two adjacent electric cores in the N electric cores; n is a positive integer greater than 1;
The positive electrode tab and the negative electrode tab of each battery cell are respectively positioned at two ends of the battery cell, the positive electrode tab of the first battery cell comprises a first bending part, and the negative electrode tab of the second battery cell comprises a second bending part; the first bending part is fixedly attached to the first conductive layer, and the second bending part is fixedly attached to the second conductive layer;
The first bending part and the first conductive layer are bonded and fixed through laser welding, and the second bending part and the second conductive layer are bonded and fixed through laser welding;
the battery cell assembly further comprises M battery cell brackets, wherein the battery cell brackets are positioned between the first battery cell and the second battery cell and are fixedly connected with the first battery cell and the second battery cell respectively; m is a positive integer greater than 1;
The battery cell bracket is a rectangular frame with flanges at two ends, and comprises a first fixing piece, a second fixing piece and a fixing plate, wherein the first fixing piece and the second fixing piece are respectively arranged at two ends of the fixing plate and are fixedly connected with the fixing plate;
The first battery cell and the second battery cell are respectively arranged on two sides of the rectangular frame, and meanwhile, the positive electrode tab and the negative electrode tab are respectively fixedly connected with the first fixing piece and the second fixing piece.
2. The cell assembly of claim 1, further comprising a first side plate fixedly connected to one side of the N cells and a second side plate fixedly connected to the opposite side of the N cells;
The first side plate is fixedly connected with the second side plate through a screw rod, and the first side plate and the second side plate are clamped and fixed with the N electric cores.
3. The cell assembly of claim 2, wherein the screw comprises a first screw and a second screw, the first fixtures in the M cell supports are each fixedly connected to the first screw, and the second fixtures in the M cell supports are each fixedly connected to the second screw.
4. The cell assembly of claim 1, wherein the first and second cells are bonded to the mounting plate by glue, respectively.
5. The cell assembly of claim 1, wherein the positive tab of the first cell is made of aluminum and the negative tab of the second cell is made of copper.
6. A battery pack comprising the cell assembly of any one of claims 1-5.
CN202010743817.3A 2020-07-29 2020-07-29 A battery cell assembly and a battery pack Active CN111916643B (en)

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CN112864534B (en) * 2021-03-01 2024-03-29 厦门海辰新材料科技有限公司 Battery cell assembly, battery cell module, battery and device using battery
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Patentee before: Zhuhai Guanyu Power Battery Co.,Ltd.

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