CN115117564B - Battery cell assembly connection structure, connection method thereof, battery cell unit, module and system - Google Patents

Battery cell assembly connection structure, connection method thereof, battery cell unit, module and system Download PDF

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Publication number
CN115117564B
CN115117564B CN202210802304.4A CN202210802304A CN115117564B CN 115117564 B CN115117564 B CN 115117564B CN 202210802304 A CN202210802304 A CN 202210802304A CN 115117564 B CN115117564 B CN 115117564B
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Prior art keywords
battery cell
bus bar
battery
busbar
cell assembly
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CN115117564A (en
Inventor
陈保国
刘峰
张志奇
任立英
张福增
卢青梅
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Tianjin EV Energies Co Ltd
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Tianjin EV Energies Co Ltd
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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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • 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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention provides a battery cell assembly connecting structure, a connecting method thereof, a battery cell unit, a module and a system, wherein the battery cell assembly connecting structure is used for connecting a first battery cell assembly and a second battery cell assembly, the first battery cell assembly comprises two first battery cells, and the second battery cell assembly comprises two second battery cells; the battery cell assembly connecting structure comprises a busbar with a bending structure, wherein a leading-out hole is formed in the bending part of the busbar, first insulating pieces are arranged on the opposite bending sides of the busbar, and first lugs of the first battery cells are attached to the surface of the first insulating pieces and penetrate out of the leading-out hole and are bent to be attached to the surface of a similar busbar; one side of the busbar attached to the first tab is provided with a second insulating part, and the second tab of the second battery cell is attached to the surface of one side, away from the busbar, of the second insulating part, and is bent and clamped between the second insulating part and the first tab and is electrically connected with the first tab, so that the minimization effect of the battery cell assembly connection structure can be realized.

Description

Battery cell assembly connection structure, connection method thereof, battery cell unit, module and system
Technical Field
The invention belongs to the technical field of battery production and preparation, and particularly relates to a battery cell assembly connecting structure and a connecting method thereof, a battery cell unit, a battery cell module and a battery cell system.
Background
In the process of assembling the battery, a plurality of battery modules are generally required to be connected in series or in parallel to improve the specific energy of the battery, and in the process of assembling the battery modules, the lugs of a plurality of battery cells are often welded together through a busbar to realize the series connection or the parallel connection of the battery cells in the battery modules. The plurality of battery cells are connected in series along the length direction of the battery cells in a common battery cell connection mode.
At present, a connection mode that the battery cells are horizontally placed and the lugs of the battery cells are directly welded on the serial copper bars after being stacked is generally adopted to realize the expansion of the battery cells in the length direction, and although the process of the connection mode is simpler, the space utilization rate in the length direction of the battery cells is low, so that the volume utilization rate is low, the volume energy density and the quality energy density of a battery module and a battery system obtained through subsequent assembly are low, and pack cost is high. Therefore, it is necessary to develop a cell connection method to improve the space utilization of the cells when the cells are extended in the length direction.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a battery cell assembly connecting structure, a connecting method thereof, a battery cell unit, a module and a system, wherein the battery cell assembly connecting structure can effectively improve the volume utilization rate of a battery cell length direction expansion structure, thereby obviously improving the volume energy density and the quality energy density of the battery cell unit, the battery module and the battery system and simultaneously reducing the material cost of a pack structure.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a battery cell assembly connection structure, which is used for connecting a first battery cell assembly and a second battery cell assembly, wherein the first battery cell assembly comprises two first battery cells, the second battery cell assembly comprises two second battery cells, and the first battery cells and the second battery cells are connected in a one-to-one correspondence manner.
The battery cell assembly connection structure comprises a bus bar with a bending structure, a guiding-out hole penetrating through the bus bar is formed in the bending part of the bus bar, first insulating pieces are arranged on opposite bending sides of the bus bar, two first battery cells are arranged on one sides of the bending part of the bus bar, two second battery cells are arranged on the other sides of the bending part of the bus bar, and first lugs of the first battery cells are attached to the surface of the first insulating pieces and penetrate out of the guiding-out hole and are bent to be clung to the similar surface of the bus bar.
The busbar laminating one side of first utmost point ear is provided with the second insulating part, the second utmost point ear subsides of second electric core are located the second insulating part is kept away from one side surface of busbar, and buckle the clamp and establish to between the second insulating part with first utmost point ear, and with first utmost point ear electric connection.
According to the preferred technical scheme, the first insulating pieces arranged on the opposite sides of the bending of the bus bar are connected with each other to form the bent integrated first insulating piece, the integrated first insulating piece is matched with the bus bar, a through hole penetrating through the integrated first insulating piece is formed in the bent part of the integrated first insulating piece, and the through hole corresponds to the guiding-out hole.
Preferably, the second insulating parts arranged on the opposite sides of the busbar in a bending way are connected with each other to form an integral second insulating part in a bending way, and the integral second insulating part is matched with the busbar.
As a preferred technical scheme of the invention, the bus bar comprises a first bus bar and a second bus bar which are in bevel butt joint, the butt joint of the first bus bar and the second bus bar is the bending part of the bus bar, the first bus bar and the second bus bar are integrally formed, and the lead-out hole is formed at the butt joint of the first bus bar and the second bus bar.
Preferably, the busbar includes the end plate, the relative both sides of end plate are the dog-ear respectively is connected with first busbar and second busbar, the end plate is the junction of busbar, the end plate first busbar with second busbar integrated into one piece, the export hole is seted up on the end plate.
Preferably, after the first tabs of the two first electric cores penetrate through the lead-out hole, the first tabs are respectively attached to a side surface, away from the first insulating piece, of the first bus bar and a side surface, away from the first insulating piece, of the second bus bar, and the second tabs of the two second electric cores are respectively electrically connected with the two first tabs.
In a second aspect, the present invention provides a connection method of the connection structure of the electrical core assembly according to the first aspect, where the connection method includes:
after a first tab of a first battery cell in the first battery cell assembly is attached to the surface of a first insulating part and penetrates through the lead-out hole, the first tab is bent and clung to the surface of a similar busbar, two second battery cells are horizontally arranged on two sides of the first battery cell assembly respectively, the second tab of the second battery cell is electrically connected with the similar first tab, a second insulating part covers the connecting surface of the first tab and the second tab, and then the second battery cell is folded in half along the second insulating part to form the battery cell assembly connecting structure.
As a preferable technical scheme of the invention, the first tabs of the two first electric cores are respectively attached to the surfaces of the opposite sides of the bending of the integrated first insulating piece, sequentially pass through the through holes on the integrated first insulating piece and the guide holes on the bus bars, and then are bent to be clung to the surfaces of the similar bus bars;
preferably, the connection surface of the first tab and the second tab is covered by an integral second insulating member.
In a third aspect, the present invention provides a battery cell unit, where the battery cell unit includes at least two battery cell assemblies sequentially connected along a length direction of the battery cell unit, and each group of battery cell assemblies includes two battery cells placed in parallel along a thickness direction of the battery cell unit, and adjacent battery cell assemblies are connected by the battery cell assembly connection structure in the first aspect.
As a preferable technical scheme of the invention, the battery cell assembly is sequentially connected to form a main body part, and a heat dissipation piece is further arranged in the main body part.
Preferably, the heat dissipation member is disposed between two battery cells in the battery cell assembly, and the heat dissipation member is of an integral structure and penetrates through the main body.
Preferably, the heat dissipation member is provided with a hollowed-out area corresponding to the connection structure, and the connection structure spans the hollowed-out area to connect adjacent battery cell assemblies.
As a preferable technical scheme of the invention, the battery cell assembly is sequentially connected to form a main body part, and the periphery of the main body part is wrapped with the heat dissipation part.
Preferably, the heat dissipation member is open at two ends along the length direction of the battery cell unit, or the heat dissipation member is open at two ends along the length direction of the battery cell unit, and the heat dissipation member is open at one end along the thickness direction of the battery cell unit.
In a fourth aspect, the present invention provides a battery module, which includes the cell unit according to the third aspect.
In a fifth aspect, the present invention provides a battery system including the battery modules according to the fourth aspect.
Compared with the prior art, the invention has the beneficial effects that:
according to the battery cell assembly connecting structure, through the cooperation among the first insulating piece, the bus bar and the second insulating piece, the connecting part between the battery cell assembly and the battery cell assembly is minimized, the volume utilization rate of the battery cell length direction expansion structure is effectively improved, and therefore the volume energy density and the mass energy density of a battery cell unit, a battery module and a battery system are remarkably improved, and meanwhile the material cost of a pack structure is reduced.
Drawings
Fig. 1 is a schematic diagram of a connection structure of a battery cell assembly according to an embodiment of the present invention.
Fig. 2 is an enlarged view of the area a in fig. 1.
Fig. 3 is an exploded view of a connection structure of a battery cell module according to an embodiment of the present invention.
Fig. 4 is an exploded view of a connection structure of a battery cell assembly according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a connection process of a connection structure of a battery cell assembly according to an embodiment of the present invention.
Fig. 6 is an exploded view of a battery cell according to an embodiment of the present invention.
Fig. 7 is an exploded view of a cell unit according to an embodiment of the present invention.
Fig. 8 is an exploded view of a cell unit according to an embodiment of the present invention.
Wherein, 10-a first cell assembly; 11-a first cell; 20-a second cell assembly; 21-a second cell; 30-a cell assembly connection structure; 31-bus bars; 32-an integral first insulating member; 33-an integral second insulator; 40-heat sink; 41-hollow area.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
In a specific embodiment, the present invention provides a battery cell assembly connection structure 30, as shown in fig. 1, where the battery cell assembly connection structure 30 is used to connect a first battery cell assembly 10 and a second battery cell assembly 20, the first battery cell assembly 10 includes two first battery cells 11, the second battery cell assembly 20 includes two second battery cells 21, and the first battery cells 11 and the second battery cells 21 are connected in a one-to-one correspondence.
As shown in fig. 2, the connection structure 30 of the electrical core assembly includes a bus bar 31 with a bending structure, a guiding hole penetrating the bus bar 31 is formed at a bending position of the bus bar 31, first insulating members are disposed on opposite bending sides of the bus bar 31, two first electrical cores 11 are disposed on one side of the bending position of the bus bar 31, two second electrical cores 21 are disposed on the other side of the bending position of the bus bar 31, and first tabs of the first electrical cores 11 are attached to the surface of the first insulating members and penetrate the guiding hole, and are bent to be attached to the surface of the similar bus bar 31.
One side of the busbar 31 attached to the first tab is provided with a second insulating member, and the second tab of the second battery core 21 is attached to the surface of one side of the second insulating member away from the busbar 31, is bent and clamped between the second insulating member and the first tab, and is electrically connected with the first tab.
According to the invention, the bus bar 31 is designed into a bending structure, the lead-out hole is formed at the bending position, meanwhile, the first insulating piece is arranged at the opposite side of the bending of the bus bar 31, and the second insulating piece is arranged at the opposite side of the bending of the bus bar 31, so that the electric connection mode of folding and overlapping between the first electrode lug in the first cell assembly 10 and the second electrode lug in the second cell assembly 20 is realized, and the connection structure between the cell assemblies is minimized; meanwhile, the first insulating piece and the second insulating piece are arranged in a folding and overlapping connection mode to provide insulation protection, so that the safety and stability of the connection structure are guaranteed.
According to the invention, the connection part between the battery cell assembly and the battery cell assembly is minimized by the cooperation of the first insulating part, the bus bar 31 and the second insulating part, so that the volume utilization rate of the battery cell length direction expansion structure is effectively improved, the volume energy density and the mass energy density of the battery cell unit, the battery module and the battery system are obviously improved, and the material cost of the pack structure is reduced.
In one embodiment, two first cells 11 are placed in parallel along the thickness direction of the first cell assembly 10; along the thickness direction of the second cell assembly 20, two second cells 21 are placed in parallel, and each first cell 11 is connected with one second cell 21 in a one-to-one correspondence.
In a specific embodiment, along the thickness direction of the first cell assembly 10 or the second cell assembly 20, the dimension of the cell assembly connection structure 30 is less than or equal to the dimension of the first cell assembly 10/the second cell assembly 20, so as to avoid the situation that the space utilization rate in the thickness direction is low due to the cell assembly connection structure 30.
In one embodiment, the first tabs at the same end of the two first electric cores 11 are respectively attached to the surfaces of the first insulating members disposed at opposite sides of the bend of the busbar 31, and pass through the lead-out holes, and then are respectively attached to opposite sides of the bend of the busbar 31 in a back-to-back bending manner.
In a specific embodiment, the second tabs at the same end of the two second electric cores 21 are respectively attached to the surface of the second insulating member disposed on the opposite side of the busbar 31, and are bent and clamped between the second insulating member and the first tab, and the second tabs of the two second electric cores 21 are respectively overlapped with the similar first tabs, so as to be electrically connected in a stacked manner, i.e. one first tab is electrically connected with one second tab.
In a specific embodiment, the first insulating members are respectively disposed on opposite sides of the busbar 31, that is, the split first insulating members are adopted to ensure the insulating effect of the folded two first tabs, and at this time, the first tabs of the two first electric cores 11 are respectively attached to the surfaces of the two first insulating members and pass through the lead-out holes, and then are respectively attached to opposite sides of the busbar 31 in a back-to-back bending manner.
In a specific embodiment, as shown in fig. 3 and fig. 4, the first insulating members disposed on opposite sides of the busbar 31 are connected to each other to form a bent integral first insulating member 32, the integral first insulating member 32 is engaged with the busbar 31, and a through hole penetrating through the integral first insulating member 32 is formed at a bent position of the integral first insulating member 32, and corresponds to the guiding hole.
Namely, the invention can also arrange the integral first insulating part 32 on the opposite side of the bending of the busbar 31, namely, the integral first insulating part 32 is adopted to ensure the insulating effect of the two first tabs after being folded, and in order to lead the first tabs to pass through the lead-out holes smoothly, the integral first insulating part 32 is required to be provided with through holes corresponding to the lead-out holes; at this time, the first tabs of the two first electric cores 11 are respectively attached to the opposite side surfaces of the bending of the integrated first insulating member 32, and sequentially pass through the through hole and the guiding-out hole, and are respectively attached to the opposite sides of the bending of the busbar 31 in a back bending manner.
In a specific embodiment, the second insulating members are respectively disposed on opposite sides of the busbar 31, that is, split second insulating members are adopted to ensure the insulating effect of the folded two second tabs respectively, at this time, the second tabs of the two second electric cores 21 are respectively attached to a side surface of the two second insulating members away from the busbar 31, and are bent and clamped between the second insulating members and the first tabs, and the two second tabs are respectively electrically connected with the adjacent first tabs.
In one embodiment, the second insulating members disposed on opposite sides of the busbar 31 are connected to each other to form a bent integral second insulating member 33, and the integral second insulating member 33 is engaged with the busbar 31.
That is, the present invention may also provide an integral second insulating member 33 on the opposite side of the busbar 31, that is, the integral second insulating member 33 is adopted to ensure the insulating effect of the folded two second tabs, at this time, the second tabs of the two second electric cores 21 are respectively attached to the opposite side surfaces of the integral second insulating member 33, and are bent and clamped between the second insulating member and the first tab, and the two second tabs are respectively electrically connected with the adjacent first tab.
In one embodiment, the bus bar 31 includes a first bus bar and a second bus bar abutted by a folding angle, the abutted portion of the first bus bar and the second bus bar is a bent portion of the bus bar 31, the first bus bar and the second bus bar are integrally formed, and the guiding hole is formed at the abutted portion of the first bus bar and the second bus bar.
The bus bar 31 formed by butt jointing the first bus bar and the second bus bar at the folding angle has a V-shaped structure.
In one embodiment, the busbar 31 includes an end plate, two opposite sides of the end plate are respectively connected with a first busbar and a second busbar by bending angles, the end plate is a bending part of the busbar, and the end plate, the first busbar and the second busbar are integrally formed, and the guiding-out hole is formed in the end plate.
The bus bar 31 formed by the end face, the first bus bar and the second bus bar in the invention has a U-shaped structure
It should be noted that the size and shape of the lead-out hole are not specifically limited in the present invention, and the first tab of the first battery core 11 is folded back after passing through the lead-out hole, so as to implement the bending arrangement of the first tab, and those skilled in the art can adjust the size and shape of the lead-out hole according to the actual busbar 31 and the size of the tab.
In a specific embodiment, after the first tabs of the two first electric cores 11 penetrate through the lead-out hole, the first tabs are respectively attached to a side surface of the first bus bar away from the first insulating member and a side surface of the second bus bar away from the first insulating member, and the second tabs of the two second electric cores 21 are respectively electrically connected with the two first tabs.
In one embodiment, the present invention provides a method for connecting the connection structure 30 of the battery cell assembly in the above embodiment, where the connection method includes:
after the first tab of the first electric core 11 in the first electric core assembly 10 is attached to the surface of the first insulating member and penetrates through the lead-out hole, the first tab is bent and clung to the surface of the similar busbar 31, as shown in fig. 5, two second electric cores 21 are respectively horizontally arranged on two sides of the first electric core assembly 10, the second tab of the second electric core 21 is electrically connected with the similar first tab, the connecting surface of the first tab and the second tab is covered with the second insulating member, and then the second electric core 21 is folded in half along the second insulating member to form the connecting structure of the electric core assembly.
In the invention, the second tab and the first tab are stacked and lapped and then electrically connected, so that a connecting surface is formed on the surface of the opposite side of the busbar 31, the second insulating piece is pressed on the connecting surface, and then the second battery core 21 is integrally folded in half to form the second battery core assembly 20, and in the folding process, the second tab is attached to the surface of the second insulating piece, which is far away from the busbar 31, after being folded, so that the second battery core 21 is integrally folded in half.
The connecting method provided by the invention is simple to operate, and the effect of minimizing the cell assembly connecting structure 30 can be realized through the operations of tab folding and cell doubling-up.
In one embodiment, the first tab and the second tab are stacked and lapped and then electrically connected by welding.
In one embodiment, the welding comprises laser welding.
In one embodiment, the support member is snapped between the bent opposite sides of the buss bar 31 prior to welding, the support member conforming to the shape and size of the buss bar 31, and the first insulator is positioned between the buss bar 31 and the support member.
In the welding process, the support piece plays a role in supporting the bus bar 31 and the first lug and the second lug which are laminated on the surface of the bus bar 31, so that the two layers of lugs and the bus bar 31 are ensured to be pressed in the welding process.
In a specific embodiment, split first insulating members are adopted, and after the first tabs of the two first electric cores 11 are respectively attached to the surfaces of the two first insulating members and pass through the lead-out holes, the first tabs are respectively attached to the opposite sides of the bends of the busbar 31 in a back-to-back bending manner.
In a specific embodiment, the first tabs of the two first electric cores 11 are respectively attached to the surfaces of the opposite sides of the bending of the integrated first insulating member 32, and sequentially pass through the through hole on the integrated first insulating member 32 and the guiding hole on the busbar 31, and then are bent to be attached to the surface of the similar busbar 31.
That is, the integrated first insulating member 32 is adopted, the first tabs of the two first electric cores 11 are respectively attached to the opposite side surfaces of the integrated first insulating member 32, and sequentially pass through the through holes and the lead-out holes and are respectively attached to the opposite sides of the busbar 31 after being bent back.
In one embodiment, split second insulating members are used, that is, two second insulating members are used to cover the connection surfaces formed on opposite sides of the busbar 31, and then two second electric cores 21 are folded in half along the two second insulating members, respectively, to form the electric core assembly connection structure 30.
In one embodiment, the integrated second insulating member 33 is used to cover the connection surface of the first tab and the second tab; the two cells are folded in half along opposite sides of the integral second insulator 33, respectively, to form the cell assembly connection structure 30.
In a specific embodiment, the invention provides a battery cell unit, which comprises at least two battery cell assemblies sequentially connected along the length direction of the battery cell unit, each group of battery cell assemblies comprises two battery cells which are placed in parallel along the thickness direction of the battery cell unit, and adjacent battery cell assemblies are connected through the battery cell assembly connecting structure 30 in the specific embodiment.
The battery cell component connecting structure 30 provided by the invention is used for connecting a plurality of battery cell units in the battery cell units, so that the volume utilization rate of the battery cell units in the length direction is effectively improved, the volume energy density and the mass energy density of the battery cell units are obviously improved, and the material cost of a pack structure is correspondingly saved.
In one embodiment, adjacent cell assemblies are connected in series, with two cells in each cell assembly connected in parallel.
In one embodiment, as shown in fig. 6 and 7, the cell assemblies are sequentially connected to form a main body, and a heat sink 40 is further disposed inside the main body.
In one embodiment, the heat dissipation element 40 is disposed between two battery cells in the battery cell assembly, and the heat dissipation element 40 is of an integral structure and penetrates through the main body.
In the present invention, two electric cores of each electric core assembly are respectively fixed on two side surfaces of the heat dissipation member 40, that is, along the length direction of the electric core unit, the heat dissipation plate penetrates through each electric core assembly, so that the heat dissipation plate penetrates through the main body.
In one embodiment, two cells in the cell assembly may be fixed to both side surfaces of the heat sink 40 by means of adhesion.
In one embodiment, the heat sink 40 comprises a heat sink plate.
In one embodiment, the heat dissipating plate includes any one of a T-shaped heat dissipating plate, an i-shaped heat dissipating plate, or an in-line heat dissipating plate.
In a specific embodiment, the heat dissipation element 40 is provided with a hollow area 41 corresponding to a connection structure, and the connection structure spans across the hollow area 41 to connect adjacent cell assemblies.
The invention simultaneously assembles the main body part of the battery cell unit and the heat dissipation part 40, firstly, two battery cells (namely, a battery cell A and a battery cell B) are respectively fixed on the surfaces of two sides of the heat dissipation part 40, the bus bar 31 spans the hollowed-out area 41 on the heat dissipation part 40, so that the bus bars on two sides of the bending part of the bus bar 31 are respectively positioned on two sides of the heat dissipation part 40, after the first insulating part is fixed on the opposite bending side of the bus bar 31, the lugs at the same end of the battery cell A and the battery cell B are attached on the surface of the first insulating part and penetrate out of the lead-out hole, and the opposite bending parts are respectively clung to the opposite direct bending sides of the bus bar; then, the other two electric cores (namely, electric core C and electric core D) are respectively and horizontally arranged on one sides of the electric core A and the electric core B far away from the heat dissipation piece 40, the electrode lugs at the same end of the electric core C and the electric core D are respectively and electrically connected with the electrode lugs of the electric core A and the electric core B, a connecting surface is formed on the opposite side of the bending of the busbar 31, a second insulating piece is pressed on the connecting surface, and the electric core C and the electric core D are respectively fixed on the two side surfaces of the heat dissipation piece 40 after being respectively folded in half along the second insulating piece. In addition, when the integrated first insulator 32 and the integrated second insulator 33 are used, both the integrated first insulator 32 and the integrated second insulator 33 need to span the hollowed-out area 41.
In one embodiment, as shown in fig. 8, the cell assemblies are sequentially connected to form a main body, and the outer circumference of the main body is wrapped with a heat sink 40.
In one embodiment, the heat sink 40 is open at both ends in the length direction of the battery cell, or the heat sink 40 is open at both ends in the length direction of the battery cell, and the heat sink 40 is open at one end in the thickness direction of the battery cell.
In the present invention, when the heat sink 40 provided on the outer periphery of the main body is used, the main body may be placed inside the heat sink 40 after the assembly of the main body is completed. The heat sink 40 may have a door-shaped structure or a mouth-shaped structure.
In a specific embodiment, the cell unit further comprises an acquisition detection device.
In one embodiment, the collection and detection device is disposed on the bus bar 31 or the battery tab.
In one embodiment, the acquisition detection device comprises a voltage acquisition detection device and/or a temperature acquisition detection device.
In one embodiment, the battery module includes the battery cell unit of the above one embodiment.
In one embodiment, the battery module includes at least two battery cells connected in series or parallel.
In one embodiment, a battery system includes the battery module of one embodiment described above.
In one embodiment, the battery system includes at least two battery modules connected in series or parallel.
A system refers to a system of equipment, a system of devices, or a production device.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.

Claims (17)

1. The battery cell assembly connecting structure is characterized by being used for connecting a first battery cell assembly and a second battery cell assembly, wherein the first battery cell assembly comprises two first battery cells, the second battery cell assembly comprises two second battery cells, and the first battery cells and the second battery cells are connected in a one-to-one correspondence manner;
the battery cell assembly connecting structure comprises a bus bar with a bending structure, wherein a guiding-out hole penetrating through the bus bar is formed in the bending position of the bus bar, first insulating pieces are arranged on opposite bending sides of the bus bar, two first battery cells are arranged on one side of the bending position of the bus bar, two second battery cells are arranged on the other side of the bending position of the bus bar, and first lugs of the first battery cells are attached to the surface of the first insulating pieces and penetrate through the guiding-out hole and are bent and clung to the surface of the similar bus bar;
the busbar laminating one side of first utmost point ear is provided with the second insulating part, the second utmost point ear subsides of second electric core are located the second insulating part is kept away from one side surface of busbar, and buckle the clamp and establish to between the second insulating part with first utmost point ear, and with first utmost point ear electric connection.
2. The connection structure of the electrical core assembly according to claim 1, wherein the first insulating members disposed on opposite sides of the busbar are connected with each other to form an integral first insulating member in a bent shape, the integral first insulating member is engaged with the busbar, a through hole penetrating through the integral first insulating member is formed at a bent position of the integral first insulating member, and the through hole corresponds to the lead-out hole.
3. The connection structure of the battery cell assembly according to claim 1, wherein the second insulating members disposed on opposite sides of the busbar are connected to each other to form an integral second insulating member having a bent shape, and the integral second insulating member is engaged with the busbar.
4. The connection structure of the electrical core assembly according to any one of claims 1 to 3, wherein the bus bar comprises a first bus bar and a second bus bar which are abutted by a folding angle, the abutted portion of the first bus bar and the second bus bar is the bent portion of the bus bar, the first bus bar and the second bus bar are integrally formed, and the lead-out hole is formed at the abutted portion of the first bus bar and the second bus bar.
5. The connection structure of claim 4, wherein the bus bar comprises an end plate, a first bus bar and a second bus bar are respectively connected to opposite sides of the end plate at angles, the end plate is a bent part of the bus bar, the end plate, the first bus bar and the second bus bar are integrally formed, and the guiding-out hole is formed in the end plate.
6. The connection structure of the battery cell assembly according to claim 4, wherein after the first tabs of the two first battery cells penetrate through the lead-out hole, the first tabs are respectively attached to a surface of the first bus bar, which is far away from the first insulating member, and a surface of the second bus bar, which is far away from the first insulating member, and the second tabs of the two second battery cells are respectively electrically connected with the two first tabs.
7. A method of connecting the cell assembly connection structure of any one of claims 1 to 6, comprising:
after a first tab of a first battery cell in the first battery cell assembly is attached to the surface of a first insulating part and penetrates through the lead-out hole, the first tab is bent and clung to the surface of a similar busbar, two second battery cells are horizontally arranged on two sides of the first battery cell assembly respectively, the second tab of the second battery cell is electrically connected with the similar first tab, a second insulating part covers the connecting surface of the first tab and the second tab, and then the second battery cell is folded in half along the second insulating part to form the battery cell assembly connecting structure.
8. The connection method according to claim 7, wherein the first tabs of the two first electrical cores are respectively attached to the surfaces of opposite sides of the bending of the integrated first insulating member, and sequentially pass through the through hole on the integrated first insulating member and the guiding hole on the busbar, and then are bent to be closely attached to the surface of the adjacent busbar.
9. The connection method according to claim 7, wherein a connection surface of the first tab and the second tab is covered with an integral second insulating member.
10. A battery cell unit, characterized in that, along the length direction of the battery cell unit, the battery cell unit includes at least two battery cell components that connect gradually, along the thickness direction of the battery cell unit, every group of battery cell components all include two parallel arrangement's electric core, adjacent the battery cell component is connected through the battery cell component connection structure of any one of claims 1-6.
11. The cell unit of claim 10, wherein the cell assemblies are sequentially connected to form a main body portion, and a heat sink is further disposed inside the main body portion.
12. The battery cell unit of claim 11, wherein the heat sink is disposed between two battery cells in the battery cell assembly, the heat sink being of unitary construction and extending through the body portion.
13. The battery cell unit of claim 11, wherein the heat dissipation member is provided with a hollowed-out area corresponding to the connection structure, and the connection structure spans the hollowed-out area to connect adjacent battery cell assemblies.
14. The cell unit of claim 10, wherein the cell assemblies are sequentially connected to form a main body, and a heat sink is wrapped around the periphery of the main body.
15. The cell unit according to claim 14, wherein the heat sink is open at both ends in a length direction of the cell unit or the heat sink is open at both ends in a length direction of the cell unit, and one end of the heat sink is open in a thickness direction of the cell unit.
16. A battery module characterized in that the battery module comprises the cell unit according to any one of claims 10 to 15.
17. A battery system comprising the battery module of claim 16.
CN202210802304.4A 2022-07-07 2022-07-07 Battery cell assembly connection structure, connection method thereof, battery cell unit, module and system Active CN115117564B (en)

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CN210379226U (en) * 2019-07-05 2020-04-21 恒大新能源科技集团有限公司 No busbar battery module structure
CN210897456U (en) * 2019-12-05 2020-06-30 昆山宝创新能源科技有限公司 Battery module
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CN113067108A (en) * 2021-03-23 2021-07-02 远景动力技术(江苏)有限公司 Busbar subassembly, battery module and vehicle
CN215933713U (en) * 2021-08-25 2022-03-01 远景动力技术(江苏)有限公司 Battery module
WO2022067693A1 (en) * 2020-09-30 2022-04-07 东莞新能安科技有限公司 Battery module, battery pack, and electronic device
CN216597892U (en) * 2021-10-09 2022-05-24 恒大新能源技术(深圳)有限公司 Connection structure of electricity core module, electricity core module and battery

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN210379226U (en) * 2019-07-05 2020-04-21 恒大新能源科技集团有限公司 No busbar battery module structure
CN210897456U (en) * 2019-12-05 2020-06-30 昆山宝创新能源科技有限公司 Battery module
WO2022067693A1 (en) * 2020-09-30 2022-04-07 东莞新能安科技有限公司 Battery module, battery pack, and electronic device
CN112510322A (en) * 2020-11-23 2021-03-16 上海卡耐新能源有限公司 Battery module and battery pack
CN113067108A (en) * 2021-03-23 2021-07-02 远景动力技术(江苏)有限公司 Busbar subassembly, battery module and vehicle
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CN216597892U (en) * 2021-10-09 2022-05-24 恒大新能源技术(深圳)有限公司 Connection structure of electricity core module, electricity core module and battery

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