CN117525766B - Battery cell module and battery pack - Google Patents

Battery cell module and battery pack Download PDF

Info

Publication number
CN117525766B
CN117525766B CN202410013542.6A CN202410013542A CN117525766B CN 117525766 B CN117525766 B CN 117525766B CN 202410013542 A CN202410013542 A CN 202410013542A CN 117525766 B CN117525766 B CN 117525766B
Authority
CN
China
Prior art keywords
elastic
elastic sheet
busbar
hole
battery cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202410013542.6A
Other languages
Chinese (zh)
Other versions
CN117525766A (en
Inventor
陈家鸿
刘伶
杨卿鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Juxin Haiju New Energy Technology Co ltd
Original Assignee
Shanghai Juxin Haiju New Energy Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Juxin Haiju New Energy Technology Co ltd filed Critical Shanghai Juxin Haiju New Energy Technology Co ltd
Priority to CN202410013542.6A priority Critical patent/CN117525766B/en
Publication of CN117525766A publication Critical patent/CN117525766A/en
Application granted granted Critical
Publication of CN117525766B publication Critical patent/CN117525766B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/581—Devices or arrangements for the interruption of current in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
    • 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
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • 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
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The utility model belongs to the technical field of energy storage, especially, relate to a battery cell module and battery pack, including division board, busbar, elastic structure, fusing structure and electric core, the division board is the insulator, busbar, elastic structure and fusing structure are the electric conductor, the electric core includes the utmost point ear, elastic structure locates on the electric core and corresponds the setting with the utmost point ear, fusing structure fixes the busbar on the division board, the division board is located the top of electric core and has seted up the hole of dodging corresponding with elastic structure; the busbar is provided with a connecting part, the elastic structure comprises an elastic sheet, the protruding parts of the two connecting parts press the elastic sheet through the avoiding holes so that the elastic sheet is pressed to elastically deform to be abutted with the lugs, and then the busbar conducts the positive lugs and the negative lugs of the two adjacent electric cores; when the fusing structure fuses, the elastic sheet elastically resets to be separated from the tab. Therefore, in the application, accidents such as thermal runaway, fire, explosion and the like of the battery can be avoided, the safety of the battery pack is improved, and the cost is reduced.

Description

Battery cell module and battery pack
Technical Field
The application belongs to the technical field of energy storage, and particularly relates to a battery cell module and a battery pack.
Background
With the technical development of the new energy field, the application of the battery is more and more extensive, and a single battery can form a battery module with higher capacity and voltage level through serial-parallel connection so as to be suitable for different electric quantity requirements. In order to connect the battery cells in series, the prior art is realized by welding the battery cells and the bus bar, and the technology has the defects of easy cold joint, false joint and the like, and can cause short circuit of off-welding due to the expansion of the battery cells when the battery cells are used; the battery core and the busbar are not protected by fusing, the battery can be damaged even when the current is too large, and even fire and the like, and finally the battery is exploded, so that the safety performance of the battery pack is greatly reduced.
Disclosure of Invention
In view of the above, the present invention is directed to a battery cell module and a battery pack, which are aimed at solving the technical problems of easy open-circuit and short-circuit caused by the welding method of the battery cell and the bus bar and reduced safety performance of the battery pack due to no fuse protection in the prior art.
The invention provides a battery cell module, which comprises a separation plate, a bus bar, an elastic structure, a fusing structure and a battery cell, wherein the separation plate is an insulator, the bus bar, the elastic structure and the fusing structure are all conductors, the battery cell comprises a tab, the elastic structure is arranged on the battery cell and is arranged corresponding to the tab, the fusing structure is used for fixing the bus bar on the separation plate, when the temperature reaches the self-melting point of the fusing structure, the fusing structure fuses, and the separation plate is positioned above the battery cell and is provided with an avoidance hole corresponding to the elastic structure;
the elastic structure comprises mounting seats, elastic sheets and connecting rods, wherein the mounting seats are arranged on the battery core and are two, the two mounting seats are positioned on two sides of the pole lugs, the two connecting rods are two, the two connecting rods are respectively connected to two opposite sides of the elastic sheets, waist-shaped holes which are in sliding connection with the connecting rods are formed in the mounting seats, when the elastic sheets are in butt joint with the pole lugs, each connecting rod is positioned at one end of each waist-shaped hole, which is far away from the pole lugs, the elastic sheets are in butt joint with the pole lugs, and when the fusing structure fuses, each connecting rod is positioned at one end of each waist-shaped hole, which is close to the pole lugs, and the elastic sheets are separated from the pole lugs;
the battery cells are arranged in a plurality, the tab of each battery cell comprises a positive tab and a negative tab, the busbar comprises two connecting parts which are distributed in sequence along the length direction of the busbar, and a convex part is arranged on the surface of each connecting part facing the elastic sheet; the protruding parts of the two connecting parts press the elastic sheets through the avoiding holes so that the elastic sheets are pressed to elastically deform to be abutted against the electrode lugs, and then the bus bars conduct the positive electrode lugs and the negative electrode lugs of the two adjacent electric cores; when the fusing structure fuses, the elastic sheet elastically resets to be separated from the tab.
Optionally, the end of the connecting rod is detachably connected with a limiting piece, the size of the limiting piece is larger than that of the waist-shaped hole, and the limiting piece is used for limiting the displacement of the connecting rod in the axial direction.
Optionally, the surface on the tab for with the elastic sheet butt is first arcwall face, the elastic sheet is the arc structure, when the bellying is exerted pressure and will the elastic sheet with the tab butt, the radian of first arcwall face with the radian looks adaptation of elastic sheet.
Optionally, the surface of the protruding portion facing the elastic piece is a second arc surface, and when the protruding portion applies pressure to abut against the elastic piece and the tab, the radian of the second arc surface is matched with the radian of the elastic piece.
Optionally, the fusing structure includes spacing portion, grafting portion and joint portion, grafting portion be equipped with two and connect respectively in on the both sides that spacing portion is relative, joint portion is located on the grafting portion, first through-hole has been seted up on the busbar, the division board have seted up with the second through-hole of first through-hole looks adaptation, grafting portion passes in proper order first through-hole with the second through-hole makes joint portion with division board joint and spacing portion with busbar butt.
Optionally, the clamping portion is a wedge-shaped protruding block, the wedge-shaped protruding block includes a guiding inclined plane and a clamping face, the guiding inclined plane is used for guiding the inserting portion when the inserting portion sequentially passes through the first through hole and the second through hole, and the clamping face is used for being abutted to the isolation plate.
The invention also provides a battery pack, which comprises the battery cell module of any one of the above, a shell and an upper cover plate, wherein the battery cell module is accommodated in the shell, the isolation plate is covered on the shell, and the upper cover plate is covered on the isolation plate.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects: the invention provides a battery cell module and a battery pack, which comprise a separation plate, a bus bar, an elastic structure, a fusing structure and a battery cell, wherein the separation plate is an insulator, the bus bar, the elastic structure and the fusing structure are all conductors, the battery cell comprises a tab, the elastic structure is arranged on the battery cell and corresponds to the tab, the fusing structure fixes the bus bar on the separation plate, when the temperature reaches the self-melting point of the fusing structure, the fusing structure fuses, and the separation plate is positioned above the battery cell and is provided with an avoidance hole corresponding to the elastic structure; the busbar is provided with a connecting part, the elastic structure comprises an elastic sheet, the protruding parts of the two connecting parts press the elastic sheet through the avoiding holes so that the elastic sheet is pressed to elastically deform to be abutted with the lugs, and then the busbar conducts the positive lugs and the negative lugs of the two adjacent electric cores; when the fusing structure fuses, the elastic sheet elastically resets to be separated from the tab. Therefore, in the present application, when the temperature of the battery cell is too high or a short circuit occurs, thermal runaway occurs rapidly, the battery cell generates heat and is conducted to the bus bar and the fusing structure. When the temperature reaches the self-melting point of the fusing structure, the fusing structure is self-melted, the connecting effect of the fusing structure is invalid, the elastic sheet is not subjected to downward pressure, the original state is recovered, the elastic sheet is in disconnection contact with the battery core, and an open circuit is formed at the moment, so that accidents such as thermal runaway, fire and explosion of the battery are avoided, the safety of the battery pack is improved, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view showing an exploded structure of a battery pack according to an embodiment of the present application.
Fig. 2 is a top view of a battery pack (excluding the upper cover plate) provided in an embodiment of the present application.
Fig. 3 is a schematic cross-sectional view taken along the direction A-A in fig. 2.
Fig. 4 is an enlarged view at a in fig. 3.
Fig. 5 is a schematic structural view of a separator according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a bus bar according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a fusing structure according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of the elastic sheet when pressed against the tab according to the embodiment of the present application.
Fig. 9 is a schematic structural view of the elastic sheet separated from the tab when not pressed in the embodiment of the present application.
Reference numerals illustrate: 1. a partition plate; 10. avoidance holes; 11. a second through hole; 12. a placement groove; 2. a busbar; 21. a connection part; 22. a boss; 221. a second arcuate surface; 23. a first through hole; 24. chamfering; 25. an arch buffer portion; 3. an elastic structure; 31. a mounting base; 311. a waist-shaped hole; 32. an elastic sheet; 33. a connecting rod; 34. a limiting piece; 4. a fusing structure; 41. a limit part; 42. a plug-in part; 43. a clamping part; 431. a guide slope; 432. a clamping surface; 5. a battery cell; 51. a tab; 511. a first arcuate surface; 6. a housing; 7. and an upper cover plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
It should be further noted that terms such as left, right, upper, and lower in the embodiments of the present application are merely relative terms or references to normal use states of the product, and should not be construed as limiting.
Referring to fig. 1 to 9, the invention provides a battery cell module, which comprises a separation plate 1, a bus bar 2, an elastic structure 3, a fusing structure 4 and a battery cell 5, wherein the separation plate 1 is an insulator, the bus bar 2, the elastic structure 3 and the fusing structure 4 are all conductors, the battery cell 5 comprises a tab 51, the elastic structure 3 is arranged on the battery cell 5 and is arranged corresponding to the tab 51, the fusing structure 4 fixes the bus bar 2 on the separation plate 1, when the temperature reaches the self-melting point of the fusing structure 4, the fusing structure 4 fuses, the separation plate 1 is positioned above the battery cell 5 and is provided with a avoiding hole 10 corresponding to the elastic structure 3;
the elastic structure 3 comprises mounting seats 31, elastic sheets 32 and connecting rods 33, wherein the mounting seats 31 are arranged on the battery core 5 and are provided with two mounting seats 31, the two connecting rods 33 are arranged on two sides of the lug 51, the two connecting rods 33 are respectively connected to two opposite sides of the elastic sheets 32, the mounting seats 31 are provided with waist-shaped holes 311 which are in sliding connection with the connecting rods 33, when the elastic sheets 32 are in butt joint with the lug 51, each connecting rod 33 is positioned at one end of the waist-shaped hole 311 far away from the lug 51, the elastic sheets 32 are in butt joint with the lug 51, and when the fusing structure 4 fuses, each connecting rod 33 is positioned at one end of the waist-shaped hole 311 close to the lug 51, and the elastic sheets 32 are separated from the lug 51;
the battery cells 5 are arranged in plurality, the tab 51 of each battery cell 5 comprises a positive tab and a negative tab, the busbar 2 comprises two connecting parts 21 which are distributed successively along the length direction of the busbar, and the surface of each connecting part 21 facing the elastic sheet 32 is provided with a protruding part 22; the bulge parts 22 of the two connecting parts 21 press the elastic sheet 32 through the avoiding holes 10 so that the elastic sheet 32 is pressed and elastically deformed to be abutted against the lugs 51, and the bus bar 2 conducts the positive lugs and the negative lugs of the two adjacent electric cores 5; when the fusing structure 4 is fused, the elastic piece 32 elastically resets to be separated from the tab 51.
In the existing design, the battery module is subjected to temperature monitoring through a battery thermal management system. However, due to the limited capabilities of the battery management system and the polarization and thermal conduction occurring within the battery, the battery management system is generally unable to predict early thermal runaway, and is unable to control the temperature of the battery cells 5 or disconnect the circuit when the temperature of the battery cells 5 increases. The working temperature of the battery cells 5 is about minus 30 ℃ to 55 ℃, when one battery is short-circuited and thermal runaway, the adjacent battery cells 5 are easily affected, the whole battery module is caused to be thermal runaway, and finally the battery is exploded, so that the safety performance of the battery pack is greatly reduced. When the temperature of the battery cell 5 is too high or short-circuited, thermal runaway occurs rapidly, the battery cell 5 heats and conducts to the busbar 2 and the fusing structure 4. When the temperature reaches the self-melting point of the fusing structure 4, the fusing structure 4 is self-melted, at the moment, the connecting action of the fusing structure 4 fails, the elastic sheet 32 is not subjected to downward pressure, the original state is recovered, the elastic sheet is in disconnection contact with the battery core 5, and at the moment, the breaking circuit is formed, so that accidents such as thermal runaway, fire and explosion of the battery are avoided, the safety of the battery pack is improved, and the cost is reduced.
In the prior art, the fusing structure 4 is used as a component for directly conducting current in a circuit structure, and by utilizing the melting point and the resistance characteristic of materials, the fusing structure can be heated and melted when overload or short circuit occurs in the circuit, so that the circuit is cut off, and the fusing structure cannot be used as a stressed component in the circuit structure to realize the fixing effect. In the present application, the bus bar 2 is a component that directly conducts current, and the fusing structure 4 is capable of conducting electricity, but its main function is to fix the partition plate 1 and the bus bar 2 and apply pressure to the elastic sheet 32. The fusing structure 4 fuses only when the temperature of the bus bar 2 is too high. In other words, if other members such as screws, which do not allow self-melting but fix the partition plate 1 and the bus bar 2, are used, the electrical connection between the adjacent two cells 5 can be also achieved. Therefore, in the present application, the fusing structure 4 can not only function as a protection circuit, but also function as a force-receiving member for fixing and limiting.
In the present embodiment, the mounting seat 31 is an insulator, and the diameter of the waist-shaped hole 311 is matched with the connecting rod 33; the elastic sheet 32 is a good conductor, has a sheet-like structure, and has elasticity. The two mounting seats 31 are arranged, and the connecting rods 33 sequentially pass through the two waist-shaped holes 311. The width of the elastic piece 32 matches the distance between the two mounting seats 31. The two ends of the elastic sheet 32 are provided with hook structures, that is, the two ends of the elastic sheet 32 are bent to form round holes through which the connecting rods 33 can pass. When the elastic piece 32 is pressed against the tab 51, the elastic piece 32 has elastic potential energy to return to its original state. When the temperature reaches the self-melting point of the fusing structure 4, the fusing structure 4 loses the fixing effect on the isolation plate 1 and the bus bar 2, the elastic sheet 32 is not pressed any more, under the action of elastic potential energy, the connecting rods 33 at two ends are pulled to move from one end, away from the tab 51, of the waist-shaped hole 311 to one end, close to the tab 51, of the waist-shaped hole 311, and the elastic sheet 32 is separated from the tab 51.
In one possible embodiment, the end of the connecting rod 33 is detachably connected with a stopper 34, the size of the stopper 34 is larger than that of the waist-shaped hole 311, and the stopper 34 is used for restricting the displacement of the connecting rod 33 in the axial direction thereof. In the present embodiment, the connecting rod 33 and the stopper 34 are connected to each other to form an i-shaped structure, and the diameter of the connecting rod 33 matches the diameter of the waist-shaped hole 311. The limiting member 34 has a circular structure, and the diameter of the limiting member 34 is larger than that of the waist-shaped hole 311, so that the displacement of the connecting rod 33 in the axial direction of the limiting member can be limited, and the connection stability of the connecting rod 33 and the waist-shaped hole 311 is improved. In order to facilitate the installation, a detachable structure is arranged between the limiting piece 34 and the connecting rod 33. For example, the connecting rod 33 is externally threaded, the limiting piece 34 is internally threaded, and the connecting rod 33 and the limiting piece 34 are detachably connected in a threaded manner. In addition, the connecting rod 33 and the limiting piece 34 can be detachably connected in a clamping manner. In order to improve the installation efficiency, one end of the connecting rod 33 is fixedly connected with the limiting piece 34, and the other end is detachable.
In an alternative embodiment, the elastic structure 3 comprises one conductive sheet and two springs. The two springs are located on both sides of the tab 51, and the conductive sheet is connected with the two springs. When the conductive sheet is subjected to external pressure, the conductive sheet is connected with the tab 51, and the conductive sheet compresses the two springs; when the temperature reaches the self-melting point of the fusing structure 4, the fusing structure 4 loses the fixing effect on the isolation plate 1 and the bus bar 2, the conductive sheet is not pressed any more, and the conductive sheet is separated from the tab 51 under the action of the elastic potential energy of the spring.
Referring to fig. 9, in a possible embodiment, the surface of the tab 51 for abutting against the elastic sheet 32 is a first arc surface 511, and the elastic sheet 32 has an arc structure, and when the protrusion 22 presses to abut against the tab 51 and the elastic sheet 32, the radian of the first arc surface 511 matches the radian of the elastic sheet 32. According to the resistance formula r=ρ×l/a, where R is resistance, ρ is resistivity, L is length, and a is cross-sectional area. Therefore, the larger the contact area between the elastic piece 32 and the tab 51 is, the lower the resistance is, the more effectively the current can be transmitted, and the energy loss is reduced. Under the condition of high current transmission, the elastic sheet 32 and the tab 51 may generate heat, and the larger abutting area can provide a larger heat dissipation surface, so that heat dissipation is facilitated, temperature rise is reduced, and the stability of the cell module is ensured. In this embodiment, therefore, the first arc surface 511 has a larger surface area than a plane, and can ensure good electrical contact and conductivity, while allowing heat dissipation.
Referring to fig. 6, in one possible embodiment, the surface of the protrusion 22 facing the elastic piece 32 is a second arc surface 221, and when the protrusion 22 presses the elastic piece 32 to abut against the tab 51, the radian of the second arc surface 221 matches the radian of the elastic piece 32. Similarly, the second arcuate surface 221 has a larger surface area than a planar surface, which ensures good electrical contact and conductivity while allowing for heat dissipation.
Referring to fig. 7, in a possible embodiment, the fusing structure 4 includes a limiting portion 41, an inserting portion 42 and a clamping portion 43, the inserting portion 42 is provided with two connecting portions respectively connected to two opposite sides of the limiting portion 41, the clamping portion 43 is provided on the inserting portion 42, the busbar 2 is provided with a first through hole 23, the partition board 1 is provided with a second through hole 11 adapted to the first through hole 23, and the inserting portion 42 sequentially passes through the first through hole 23 and the second through hole 11 so that the clamping portion 43 is clamped with the partition board 1 and the limiting portion 41 is abutted with the busbar 2. Specifically, the fusing structure 4 has a C-shaped structure. Preferably, when the fusing structure 4 fixes the partition plate 1 and the bus bar 2, the limiting portion 41 is located in abutment with the upper surface of the bus bar 2 in the horizontal direction, and the inserting portion 42 is located in the vertical direction and sequentially passes through the first through hole 23 and the second through hole 11. The mutual engagement between the limiting portion 41 and the clamping portion 43 can limit the relative positions of the partition plate 1 and the bus bar 2 in the vertical direction, and the mutual engagement between the plugging portion 42 and the first through hole 23 and the second through hole 11 can limit the relative positions of the partition plate 1 and the bus bar 2 in the horizontal direction. The limiting part 41 and the inserting part 42 are in right angle design, so that the whole processing and manufacturing of the fusing structure 4 are facilitated, and the positioning accuracy of the fusing structure 4 is improved.
In order to improve the stability during installation, two fusing structures 4 are fixed to each connecting part 21. In other embodiments, the number of fusing structures 4 may be set according to the actual application.
Further, referring to fig. 7, the locking portion 43 is a wedge-shaped protrusion, and the wedge-shaped protrusion includes a guiding inclined plane 431 and a locking surface 432, the guiding inclined plane 431 is used for guiding the locking portion 42 when the locking portion 42 passes through the first through hole 23 and the second through hole 11 in sequence, and the locking surface 432 is used for abutting against the partition board 1. In the present embodiment, since the engaging portion 43 is a wedge-shaped bump, both the limiting portion 41 and the inserting portion 42 have a certain ductility, so that the engaging portion 43 smoothly passes through the first through hole 23 and the second through hole 11. When the clamping part 43 passes through the first through hole 23, the guide inclined surface 431 is firstly abutted against the inner wall of the first through hole 23, and the inserting part 42 is separated in a direction away from each other under the action of the guide inclined surface 431 until the wedge-shaped protruding block completely passes through the first through hole 23, and then the inserting part 42 is restored to the original state; when the engaging portion 43 passes through the second through hole 11, the guiding inclined surface 431 contacts with the inner wall of the second through hole 11, and the inserting portion 42 is separated in a direction away from each other under the action of the guiding inclined surface 431 until the wedge-shaped protruding block completely passes through the second through hole 11, and then the inserting portion 42 is restored to the original state, and at this time, the engaging surface 432 forms an engagement with the lower surface of the partition board 1. The structure is simple to install and good in structural stability.
Referring to fig. 6, in one possible embodiment, the bus bar 2 is provided with a chamfer 24, the partition plate 1 is formed with a placement groove 12 corresponding to the bus bar 2, and the escape hole 10 is formed at the bottom of the placement groove 12. In this embodiment, the chamfer 24 may smooth or bevel the edge of the busbar 2, reducing sharp edges, reducing the risk of accidental injury, and reducing mishandling. When using the busbar 2, malfunctions or scratches due to sharp edges are avoided. The edges of the chamfered busbar 2 are more easily noticeable, which improves the perception of the position and shape of the object and visibility. However, when the bus bar is installed, the position where the bus bar 2 is placed is not corresponding to the placing groove 12, and the bus bar cannot be installed, so that the fool-proof function is achieved, and the safety of the battery cell module is improved. The number and positions of the placement grooves 12 and the bus plates may be set according to actual applications.
Referring to fig. 6, in one possible embodiment, an arch buffer 25 is formed in the middle of two connection portions 21, and the arch buffer 25 has an elastic deformation amount for adjusting the length of the bus bar 2. The bus bar 2 having the arch buffer portion 25 has a predetermined elastic deformation amount in its own length direction. When the bus bar 2 receives a force in the longitudinal direction thereof (for example, when the battery expands), the arched buffer portion 25 can absorb the force so that the entire length of the bus bar 2 can be lengthened or shortened, thereby improving versatility and adaptability of the bus bar 2.
The invention also provides a battery pack, which comprises any one of the battery cell modules, a shell 6 and an upper cover plate 7, wherein the battery cell module is accommodated in the shell 6, the isolation plate 1 is covered on the shell 6, and the upper cover plate 7 is covered on the isolation plate 1. The shell 6 is formed by injection molding or sheet metal bending, and plays roles in placing the battery cell 5 and fixing the battery cell 5; the upper cover plate 7 is formed integrally by injection molding or formed by bending metal plates, so that the protection effect is achieved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a electricity core module which characterized in that: including division board (1), busbar (2), elastic structure (3), fusing structure (4) and electric core (5), division board (1) is the insulator, busbar (2) elastic structure (3) with fusing structure (4) are the electric conductor, electric core (5) include utmost point ear (51), elastic structure (3) locate on electric core (5) and with utmost point ear (51) correspond the setting, fusing structure (4) will busbar (2) are fixed on division board (1) and when the temperature reaches fusing structure (4) from the fusing point, fusing structure (4) fuses, division board (1) are located the top of electric core (5) and offer dodge hole (10) corresponding with elastic structure (3).
The elastic structure (3) comprises mounting seats (31), elastic sheets (32) and connecting rods (33), wherein the mounting seats (31) are arranged on the battery cell (5) and are provided with two mounting seats (31) which are positioned on two sides of the lug (51), the connecting rods (33) are provided with two connecting rods (33) which are respectively connected to two opposite sides of the elastic sheets (32), the mounting seats (31) are provided with waist-shaped holes (311) which are in sliding contact with the connecting rods (33), when the elastic sheets (32) are in butt joint with the lug (51), each connecting rod (33) is positioned at one end of each waist-shaped hole (311) which is far away from the lug (51), the elastic sheet (32) is in butt joint with the lug (51), and when the fusing structure (4) is fused, each connecting rod (33) is positioned at one end of each waist-shaped hole (311) which is close to the lug (51), and each connecting rod (33) is separated from the lug (32);
the battery cells (5) are arranged in a plurality, the lug (51) of each battery cell (5) comprises a positive lug and a negative lug, the busbar (2) comprises two connecting parts (21) which are distributed in sequence along the length direction of the busbar, and a convex part (22) is arranged on the surface of each connecting part (21) facing the elastic sheet (32); the protruding parts (22) of the two connecting parts (21) press the elastic sheet (32) through the avoidance holes (10) so as to enable the elastic sheet (32) to be pressed and elastically deformed to be abutted against the lugs (51), and then the busbar (2) conducts the positive lugs and the negative lugs of the two adjacent battery cells (5); when the fusing structure (4) fuses, the elastic sheet (32) elastically resets to be separated from the tab (51).
2. The battery cell module according to claim 1, wherein a stopper (34) is detachably connected to an end portion of the connecting rod (33), the stopper (34) having a size larger than that of the waist-shaped hole (311), the stopper (34) being for restricting displacement of the connecting rod (33) in an axial direction thereof.
3. The battery cell module as claimed in claim 1, wherein a surface of the tab (51) for abutting against the elastic sheet (32) is a first arc surface (511), the elastic sheet (32) is in an arc structure, and when the protrusion (22) presses the elastic sheet (32) to abut against the tab (51), the radian of the first arc surface (511) is matched with the radian of the elastic sheet (32).
4. A cell module according to claim 3, wherein the surface of the protrusion (22) facing the elastic sheet (32) is a second arc surface (221), and when the protrusion (22) presses to abut the elastic sheet (32) against the tab (51), the radian of the second arc surface (221) is adapted to the radian of the elastic sheet (32).
5. The battery cell module as claimed in claim 1, wherein the fusing structure (4) comprises a limiting part (41), a plugging part (42) and a clamping part (43), the plugging part (42) is provided with two clamping parts and is respectively connected to two opposite sides of the limiting part (41), the clamping part (43) is arranged on the plugging part (42), the busbar (2) is provided with a first through hole (23), the isolation board (1) is provided with a second through hole (11) matched with the first through hole (23), and the plugging part (42) sequentially penetrates through the first through hole (23) and the second through hole (11) so that the clamping part (43) is clamped with the isolation board (1) and the limiting part (41) is abutted with the busbar (2).
6. The battery cell module according to claim 5, wherein the clamping portion (43) is a wedge-shaped protrusion, the wedge-shaped protrusion comprises a guiding inclined surface (431) and a clamping surface (432), the guiding inclined surface (431) is used for guiding the clamping portion (42) when the clamping portion (42) sequentially passes through the first through hole (23) and the second through hole (11), and the clamping surface (432) is used for abutting against the isolation plate (1).
7. A battery pack comprising the battery cell module as claimed in any one of claims 1 to 6, further comprising a housing (6) and an upper cover plate (7), wherein the battery cell module is accommodated in the housing (6), the isolation plate (1) is covered on the housing (6), and the upper cover plate (7) is covered on the isolation plate (1).
CN202410013542.6A 2024-01-04 2024-01-04 Battery cell module and battery pack Active CN117525766B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410013542.6A CN117525766B (en) 2024-01-04 2024-01-04 Battery cell module and battery pack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410013542.6A CN117525766B (en) 2024-01-04 2024-01-04 Battery cell module and battery pack

Publications (2)

Publication Number Publication Date
CN117525766A CN117525766A (en) 2024-02-06
CN117525766B true CN117525766B (en) 2024-03-12

Family

ID=89764918

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410013542.6A Active CN117525766B (en) 2024-01-04 2024-01-04 Battery cell module and battery pack

Country Status (1)

Country Link
CN (1) CN117525766B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN211428258U (en) * 2019-12-30 2020-09-04 合肥国轩高科动力能源有限公司 External short circuit protection device of lithium ion battery
CN113394518A (en) * 2021-05-07 2021-09-14 恒大新能源技术(深圳)有限公司 Battery module
CN214254611U (en) * 2020-12-25 2021-09-21 东莞新能安科技有限公司 Connection structure of tab and bus bar, electrochemical device and electric device
CN214898776U (en) * 2021-02-01 2021-11-26 恒大新能源技术(深圳)有限公司 Battery module and battery pack
CN217035895U (en) * 2022-01-12 2022-07-22 恒大新能源技术(深圳)有限公司 Utmost point ear connection structure and battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN211428258U (en) * 2019-12-30 2020-09-04 合肥国轩高科动力能源有限公司 External short circuit protection device of lithium ion battery
CN214254611U (en) * 2020-12-25 2021-09-21 东莞新能安科技有限公司 Connection structure of tab and bus bar, electrochemical device and electric device
CN214898776U (en) * 2021-02-01 2021-11-26 恒大新能源技术(深圳)有限公司 Battery module and battery pack
CN113394518A (en) * 2021-05-07 2021-09-14 恒大新能源技术(深圳)有限公司 Battery module
CN217035895U (en) * 2022-01-12 2022-07-22 恒大新能源技术(深圳)有限公司 Utmost point ear connection structure and battery

Also Published As

Publication number Publication date
CN117525766A (en) 2024-02-06

Similar Documents

Publication Publication Date Title
CN106953059B (en) Bus bar
EP2768047B1 (en) Battery pack having improved safety
EP3734692B1 (en) Battery module and battery pack
EP2741348B1 (en) Battery pack having improved safety
KR101690295B1 (en) Overcurrent shut-off device and Secondary battery comprising the same
EP3582291B1 (en) Battery module
KR101401477B1 (en) Connecting element for secondary battery, Battery module and Battery pack comprising the same
KR20180091446A (en) Battery pack and busbar applied for the same
JP2012527716A (en) Current fuse device and battery assembly including the same
CN104904037A (en) Sensing assembly for secondary battery module and secondary battery module provided with sensing assembly
CN104716289A (en) Safety protective structure for lithium battery module
CN108923007B (en) High-efficiency power battery module
CN105449150A (en) Bus bar applied to lithium ion battery pack
CN102769120A (en) Battery pack connecting device, battery system and electric equipment
CN117525766B (en) Battery cell module and battery pack
CN204407399U (en) Soft package lithium battery cathode tab jockey
CN107104218B (en) Lithium ion power battery connection method adopting fusible alloy
CN215451610U (en) Battery module and battery pack
CN115312981A (en) High-capacity battery shell, high-capacity battery with shell and series battery pack
CN109935775B (en) Square battery module structure
CN210074012U (en) Battery connection piece with fusing function
CN219498132U (en) Self-fusing type battery module safety protection structure for power energy storage
CN219017877U (en) Battery cell thermal protection connection structure and battery module
CN218333676U (en) Battery pack maintenance switch with absorption circuit
CN219760668U (en) Overheat protection device and battery system of electric core or electric core unit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant