CN112072017A

CN112072017A - Battery module based on battery core string

Info

Publication number: CN112072017A
Application number: CN202010835417.5A
Authority: CN
Inventors: 邓江南; 姜斌; 刘晨南; 杨秋立
Original assignee: Dongguan Tafel New Energy Technology Co Ltd; Jiangsu Tafel New Energy Technology Co Ltd; Jiangsu Tafel Power System Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2020-12-11

Abstract

The invention discloses a battery module based on a battery cell string, which comprises a mouth-shaped plate frame and a battery cell array. The port-shaped plate frame is a plate frame which is enclosed by strip-shaped plate bodies on four sides and is provided with openings at two ends. The cell array is a square array formed by an even number of cell strings. And the battery cell array is sealed in the port frame through a front end assembly and a rear end assembly. The battery cell string is formed by serially connecting a plurality of battery cells which are respectively arranged at two ends of an electrode pole column with a strip-shaped structure. The electrode polarity directions of the adjacent battery cell strings are opposite, and the adjacent battery cell strings are connected in series through the polar columns of the end electrodes. The front ends of the battery cell strings on the two sides are respectively connected with output electrode lugs. Every electricity core is provided with single core and gathers board and explosion-proof valve, and single core gathers the board and is equipped with voltage terminal and temperature terminal. The voltage terminal and the temperature terminal are collected to a collection interface at the rear end through a collection frame. The bottom of the battery core is provided with a heat conduction structure. The energy density of the battery pack assembled by the battery cell and the battery module is improved through the overall optimization design of the battery cell and the battery module.

Description

Battery module based on battery core string

Technical Field

The present invention relates to a battery module.

Background

In the prior art, the positive and negative electrodes of a square battery cell used to form a battery pack are usually located on the top surface of the battery cell. When the battery pack is matched, the battery core is connected with the battery core through corresponding accessories. The large amount of space occupied by these connected fittings results in a reduction in the overall energy density of the battery pack. For this reason, patent documents CN 102104167a and CN 110518174 a both disclose internal tandem type batteries. The voltage of the single battery is increased by the batteries connected in series inside, and external connecting pieces are reduced, so that the overall energy density of the battery pack is improved. Such an internal series connected cell is essentially a plurality of cells connected in series. The battery cannot monitor a single battery cell, and the monitoring is performed by taking the battery after being connected in series as a unit. On the other hand, the batteries are connected in series, the assembly of the batteries is complex, and the batteries are easy to lose effectiveness after assembly, for example, electrolyte among the battery cores is easy to circulate due to internal devices or assembly reasons.

Disclosure of Invention

The problems to be solved by the invention are as follows: through the holistic optimal design to electric core and battery module, improve battery package space utilization efficiency to promote battery package energy density.

In order to solve the problems, the invention adopts the following scheme:

a battery module based on a battery cell string comprises a window-shaped plate frame and a battery cell array; the port-shaped plate frame is a plate frame which is enclosed by strip-shaped plate bodies on four sides and is provided with openings at two ends; two ends of the port-shaped plate frame are respectively a front end and a rear end; the battery cell array is a square array formed by an even number of battery cell strings; sealing the battery cell array in the port plate frame through a front end assembly arranged at a front end opening and a rear end assembly arranged at a rear end opening; the front end assembly includes an output electrode tab; the battery cell string comprises a plurality of battery cells; the battery cell is in a strip square structure, and the polar columns of the two electrodes are respectively positioned at the two ends of the battery cell; the battery cell string is formed by welding and then connecting a pole of the positive electrode of one battery cell and a pole of the negative electrode of the other battery cell in series; two ends of the battery cell string are respectively positioned at the front end and the rear end; the polarity directions of the electrodes of the adjacent battery cell strings are opposite; the terminal posts of the end electrodes of the adjacent cell strings are connected in series; the electric core strings at the most edges of the two sides are respectively connected with the output electrode lugs at the front ends.

Furthermore, the front end assembly also comprises a front end bus plate, a tandem bus, a front end insulating plate and a front end plate; a lug supporting piece is arranged on the front end plate and is fixedly connected with the port plate frame; the front-end bus bar frame plate is arranged close to the front end face of the battery cell array; the serial connection bus bar is arranged in the bus bar groove of the front-end bus bar frame plate and is connected with a pole of an electrode at the end part of the battery cell string; the front end insulating plate is arranged between the front end bus piece frame plate and the front end plate and is tightly attached to the front end bus piece frame plate; one end of the output electrode lug is arranged in a lug groove of the front-end bus sheet frame plate and is connected with a pole of the electrode at the end part of the electric core string, and the other end of the output electrode lug passes through a lug hole on the front-end insulating plate and then is arranged on the lug support piece.

Further, the rear end assembly comprises a rear end bus plate, a tandem bus, a rear end insulating plate and a rear end plate; the rear end plate is fixedly connected with the port plate frame; the rear-end bus bar frame plate is arranged close to the rear end face of the battery cell array; the serial connection bus bar is arranged in the bus bar groove of the rear-end bus bar frame plate and is connected with a pole of an electrode at the end part of the battery cell string; the rear end insulating plate is arranged between the rear end bus piece frame plate and the rear end plate and clings to the rear end bus piece frame plate.

Further, a single-core acquisition board is arranged at the negative end of the battery core; the single-core collecting plate comprises a back plate, a voltage detection terminal, a temperature sensor, a voltage pole column laminating plate and a heat conduction pole column laminating plate; the back plate is tightly attached to the end face of the negative electrode end of the battery cell; the voltage detection terminal, the temperature sensor, the voltage pole column laminating plate and the heat conduction pole column laminating plate are arranged on the back plate; the voltage pole post fitting plate and the heat-conducting pole post fitting plate are connected with a pole post at the negative end of the battery core; the voltage detection terminal is electrically connected with the voltage pole fitting plate; the temperature detection terminal is electrically connected with the temperature sensor; the heat-conducting pole column laminating plate is connected with the temperature sensor through the heat-conducting layer.

Further, the device also comprises a collecting and collecting frame; the collecting and collecting frame comprises a collecting interface and a plurality of terminal connectors; the terminal joint corresponds to and is connected with the voltage detection terminal and the temperature detection terminal of the single-core acquisition board on the battery core; each terminal fitting is connected to the collection interface.

Further, an interface frame is arranged on the rear end plate; the collection interface is arranged on the interface frame.

Further, the voltage detection terminal and the temperature detection terminal comprise terminal shells and contact pins arranged in the terminal shells; the terminal shell of the voltage detection terminal is internally provided with a connecting pin, and the terminal shell of the temperature detection terminal is internally provided with two separated connecting pins; the terminal shell is square and is provided with a plug accommodating cavity with an opening at the top end; the contact pins are accommodated in the plug accommodating cavities and are vertically arranged; a buckle opening is formed in a side plate of the terminal shell; the terminal fitting includes a plug main body and a spring plate; the plug main body is of a square structure; the number of the spring plates is two; the two spring plates are respectively arranged on the back-facing side surfaces of the two sides of the plug main body; the spring plate is provided with a hasp protrusion; when the plug main body of the terminal connector is inserted into the plug accommodating cavity, the spring plate contracts inwards and is made to be clamped into the buckle opening by means of elasticity of the spring plate.

Furthermore, the collecting and collecting frame also comprises transverse supporting bars and longitudinal supporting bars which are arranged on the top surface of the battery cell array; the terminal connectors are arranged on the transverse supporting bars and the longitudinal supporting bars; the longitudinal support bars are arranged along the front end and the rear end of the battery module and are connected with and perpendicular to the transverse support bars; the collection port is connected to the transverse support bar.

Furthermore, a buffer cushion is arranged between the battery cell of the battery cell string and the battery cell of the adjacent battery cell string; the transverse supporting bars are provided with buffering convex bridges.

Furthermore, a collecting support frame is also arranged between the collecting and collecting rack and a top plate of the port-shaped plate frame.

Further, a layer of insulating film is arranged on the surface of the electric core; cell protection frames are arranged at two ends of the cell; the battery cell protection frame is used for making the battery cell overhead, so that the battery cell is insulated and isolated from the four-surface plate body of the mouth-shaped plate frame.

Further, a heat conducting layer is arranged between the battery cell and the bottom plate of the mouth-shaped plate frame.

Further, an explosion-proof valve is arranged on the top surface of the battery cell; a plurality of explosion holes are formed in a top plate of the port-shaped plate frame; and the positions of the explosion holes correspond to the positions of the explosion-proof valves of the battery cores.

The invention has the following technical effects: according to the invention, through the optimized design of the whole battery core and the battery module, the structure of the battery module is compact, the occupied space of the battery module accessories is small, so that the energy density of the whole is improved, and the interaction of different functions of the battery module and the outside is respectively in different directions, for example, a high-voltage interface and a low-voltage interface are respectively positioned at two ends of the module, the heat exchange is positioned at the bottom surface of the module, and the explosion-proof design is positioned at the top surface, so that the structure optimization of the battery pack is facilitated, and the energy density of the battery.

Drawings

Fig. 1 is an exploded view of the overall structure of an embodiment of a battery module according to the present invention.

Fig. 2 is a schematic view of the overall structure of an embodiment of the battery module according to the present invention.

Fig. 3 is an exploded schematic view of a cell string.

Fig. 4 is a schematic structural diagram of a cell butt joint in a cell string.

Fig. 5 is a front exploded view of an embodiment of a battery module according to the present invention.

Fig. 6 is a rear end exploded view of an embodiment of a battery module according to the present invention.

Fig. 7 is an exploded view of the negative terminal of the cell.

Fig. 8 is a schematic structural diagram of the collection and collection rack.

Fig. 9 is an enlarged view of a dotted square portion in fig. 8.

Fig. 10 is a front view of the front end bus rack.

Fig. 11 is a rear view of the front-end chassis frame.

Fig. 12 is a schematic structural view of the cell protective frame.

Fig. 13 is an exploded schematic view among the voltage detection terminal, the temperature detection terminal, and the terminal fitting.

Fig. 14 is a schematic view of the connection of the cell post and the strap.

Wherein the content of the first and second substances,

101 is a diaphragm frame, 102 is a battery cell array, 103 is a front end component, 104 is a rear end component, 105 is an acquisition and collection component, 108 is a front end, 109 is a rear end, 1 is an L-shaped plate, 11 is a top plate, 12 is a side plate, 121 is an end extension of the side plate, 13 is a bottom plate, 14 is an explosion hole, 15 is a heat conduction layer, 151 is heat conduction and insulation structural adhesive, 16 is a collection support frame, and 19 is a battery cell accommodating cavity;

200 is a battery cell string, 21 is a battery cell, 211 is a pole, 2111 is a pole groove, 212 is an explosion-proof valve, 213 is an insulating film, 219 is a pole welding seam, 21N is a battery cell negative electrode end, 21P is a battery cell positive electrode end, 22 is a single-core collecting plate, 221 is a back plate, 222 is a voltage detection terminal, 223 is a temperature detection terminal, 224 is a temperature sensor, 225 is a voltage pole laminating plate, 226 is a heat conduction pole laminating plate, 227 is a heat conduction layer, 23 is a battery cell protective frame, 231 is an end face supporting plate, 232 is a side face supporting plate, 233 is a top face supporting plate, 234 is a bottom face supporting plate, 235 is a pole collecting plate avoiding hole, and 29 is a buffer pad;

31 is a front-end plate frame, 311 is a plate groove, 312 is a pole hole, 313 is a pole lug groove, 314 is a collecting plate avoiding groove, 32 is a tandem-connection plate, 321 is a clamping convex strip, 33 is an output electrode pole lug, 34 is a front-end insulating plate, 341 is a pole lug hole, 35 is a front-end inner plate, 36 is a front-end plate, 361 is a support piece groove, 362 is a pole lug seat jack, 363 is a front-end plate side face, 364 is a front-end mounting hole, 37 is a pole lug support piece, 371 is a pole lug support groove, and 372 is a pole lug seat insert;

41 is a rear end piece rack, 42 is a rear end insulating plate, 43 is a rear end inner side plate, 44 is a rear end plate, 441 is an interface rack seat jack, 443 is a rear end plate side surface, and 444 is a rear end mounting hole;

51 is a collection and collection frame, 511 is a transverse supporting bar, 512 is a longitudinal supporting bar, 513 is a terminal connector, 514 is a buffer convex bridge, 52 is a collection interface, 53 is an interface frame, 531 is an interface frame table panel, and 532 is an interface frame socket;

61 is a terminal shell, 62 is a plug pin, 63 is a connector accommodating cavity, and 64 is a hasp opening;

91 is a plug body, 92 is a spring plate, and 93 is a snap projection;

f is the direction in which the front and rear ends of the battery module face, and the arrow F points from the rear end of the battery module to the front end of the battery module.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, a battery module based on a battery cell string includes a window frame 101, a battery cell array 102, a front end assembly 103, a rear end assembly 104, and a collection and collection assembly 105. The port frame 101 is a frame surrounded by four strip-shaped plates and having openings at both ends. The four-side strip-shaped plate bodies are respectively a top plate 11, two side plates 12 and a bottom plate 13. In this embodiment, the port-shaped plate frame 101 is formed by buckling and welding two elongated L-shaped plates 1, wherein one L-shaped plate 1 includes one side plate 12 and a top plate 11, and the other L-shaped plate 1 includes the other side plate 12 and a bottom plate 13. Inside the port frame 101 is a battery cell accommodating chamber 19. The two ends of the window frame 101 are a front end 108 and a rear end 109, respectively. The front end 108 and the rear end 109 of the knife frame are also the front end 108 and the rear end 109 of the battery module.

The cell array 102 is a square array composed of an even number of cell strings 200. Each cell string 200 includes a plurality of cells 21. The cell array 102 is disposed in the cell accommodating chamber 19. The front and rear openings of the plate frame 101 are respectively sealed by a front end module 103 and a rear end module 104, so that the cell array 102 is sealed inside the plate frame 101 by the front end module 103 provided at the front opening and the rear end module 104 provided at the rear opening. The front end module 103, as shown in fig. 1 and 5, includes a front end subassembly frame plate 31, a tandem subassembly 32, an output electrode tab 33, a front end insulator plate 34, a front end inner plate 35, and a front end plate 36. The rear end module 104, as shown in fig. 1 and 6, includes a rear end platform 41, a tandem strap 32, a rear end insulator plate 42, a rear end inner plate 43, and a rear end plate 44.

Referring to fig. 3 and 4, the cell string 200 includes a plurality of cells 21 connected in series. Specifically, the battery cell 21 has a rectangular square structure, and the two poles 211 of the two electrodes are respectively located at two ends of the battery cell. The battery cell string 200 is formed by welding and connecting a positive pole 211 of one battery cell 21 and a negative pole 211 of another battery cell 21 in series. That is, the two ends of the battery cell 21 are a positive terminal 21P and a negative terminal 21N, respectively. The positive electrode terminal 211 of the battery cell 21, that is, the terminal 211 located at the positive electrode terminal 21P of the battery cell 21, is a positive electrode terminal; the terminal 211 of the negative electrode of the cell 21, that is, the terminal at the negative electrode end 21N of the cell 21, is a negative electrode terminal. The polar columns 211 at the two ends are respectively arranged on the end faces at the two ends of the battery cell 21 and are of a square column structure. Referring to fig. 4, a welding seam 219 is formed after the top surface of the square column of the terminal post 211 of the positive terminal 21P of one cell 21 and the top surface of the square column of the terminal post 211 of the negative terminal 21N of another cell 21 are tightly attached, and then the welding seam 21 is welded by a laser welding process so that the terminal posts 211 of two cells 21 are connected, thereby realizing the serial connection of two cells 21 and further forming the cell string 200 in serial connection.

Referring to fig. 7, a single-core collecting plate 22 is disposed on an end surface of the negative electrode end 21N of the cell 21. The single core collecting plate 22 includes a back plate 221, a voltage detection terminal 222, a temperature detection terminal 223, a temperature sensor 224, a voltage pole lamination plate 225, and a heat conductive pole lamination plate 226. The back plate 221 is tightly attached to the end surface of the negative electrode end 21N of the battery cell 21 and bonded by structural adhesive. The voltage detection terminal 222, the temperature detection terminal 223, the temperature sensor 224, the voltage pole lamination plate 225, and the heat conductive pole lamination plate 226 are provided on the back plate 221. The voltage pole attachment plate 225 and the heat-conducting pole attachment plate 226 are connected to the pole 211 of the negative electrode terminal 21N of the battery cell 21. In this embodiment, the voltage pole fitting plate 225 and the heat conducting pole fitting plate 226 are sheet-shaped bodies made of nickel, and are connected to the cylindrical surface of the pole 211 by welding. The voltage detection terminal 222 is electrically connected to the voltage post attachment plate 225. The temperature detection terminal 223 is electrically connected to the temperature sensor 224. The heat-conducting pole fitting plate 226 is connected with the temperature sensor 224 through the heat-conducting layer 227.

The collection and collection assembly 105 is used for collecting the cell temperature and the voltage, specifically, collecting the voltage detection terminal 222 and the temperature detection terminal 223 on the single-core collection board 22 on each cell 21 in the cell array 102 to a unified battery module interface. The collection and collection assembly 105 includes a collection and collection rack 51 and a collection and support rack 16. The collection and collection frame 51 is disposed on the top surface of the cell array 102. The collection support frame 16 is arranged between the collection frame 51 and the top plate 11, and is a hollow plate structure for providing physical and insulation support for the collection frame 51. Referring to fig. 8 and 9, the collection and collection frame 51 includes a lateral support bar 511, a plurality of longitudinal support bars 512, a collection port 52, and a plurality of terminal fittings 513. Each of the longitudinal support bars 512 is disposed along the front and rear end directions of the battery module, connected to and perpendicular to the lateral support bars 511. The longitudinal support bars 512 are disposed in the front and rear end direction of the battery module, that is, the longitudinal support bars 512 are disposed in the front and rear end direction F of the battery module. The lateral support bars 511 then span the cells 21 at the ends of the respective cell strings 200. The collection port 52 is connected to the lateral support bars 511. Terminal fittings 513 are provided on the lateral and longitudinal support bars 511 and 512. The voltage detection terminal 222 and the temperature detection terminal 223 of the single-core collection plate 22 on the battery cell 21 correspond to one terminal connector 513 respectively and are connected in an inserting manner. Each terminal fitting 513 is electrically connected to the collection interface 52.

The even number of cell strings 200 are sequentially arranged in the cell array 102 along a direction perpendicular to the front and rear ends of the battery module facing the direction F. The two ends of the cell string 200 are also the two ends of the cell array 102. The end surfaces at the two ends of the cell array 102 are formed by combining the end surfaces at the two ends of the cell string 200. The end surfaces of the two ends of the cell string 200 are the end surfaces of the end cells 21 at the two ends of the cell string 200. The cell string 200 is arranged in the battery module front-rear end facing direction F, so that two ends of the cell string 200 are located at the front end 108 and the rear end 109, respectively, or that is, two ends of the cell array 102 are located at the front end 108 and the rear end 109, respectively. The polarities of the electrodes of the adjacent cell strings 200 are opposite, and specifically, the poles 211 of the cells 21 on the end surface of the cell array 102 are alternately arranged according to the positive and negative polarities. Therefore, after the terminals 211 of the battery cells 21 on the end surface of the battery cell array 102 are connected in series by the connecting bars 32, all the battery cells 21 in the battery cell array 102 are connected in series to form an integrally-connected battery cell group. The output electrodes of the cell group are located at both sides of the front end 108, more specifically, the terminal posts 211 of the cells 21 at the front ends of the two side edge-most cell strings 200 are the output electrodes of the cell group, and the terminal posts 211 of the cells 21 at the front ends of the two side edge-most cell strings 200 are connected to the output electrode tabs 33 in the front end module 103. Taking the example of fig. 1 as an example, the cell array 102 in the figure is composed of 6 cell strings 200, and the six cell strings 200 are, in sequence, a first cell string, a second cell string, a third cell string, a fourth cell string, a fifth cell string, and a sixth cell string. The terminal posts 211 on the rear end faces of the first cell string and the second cell string are serially connected through the serial bus bar 32 in the rear end assembly 104, the terminal posts 211 on the front end faces of the second cell string and the third cell string are serially connected through the serial bus bar 32 in the front end assembly 103, the terminal posts 211 on the rear end faces of the third cell string and the fourth cell string are serially connected through the serial bus bar 32 in the rear end assembly 104, the terminal posts 211 on the front end faces of the fourth cell string and the fifth cell string are serially connected through the serial bus bar 32 in the front end assembly 103, the terminal posts 211 on the rear end faces of the fifth cell string and the sixth cell string are serially connected through the serial bus bar 32 in the rear end assembly 104, and the terminal posts 211 on the front end faces of the first cell string and the sixth cell string are respectively used as the positive and negative poles of the output electrode of the cell array 102 and are connected to the output electrode tabs 33. The first cell string and the sixth cell string are also the above-mentioned cell strings 200 at the two sides of the cell array 102.

As shown in fig. 10 and 11, the front-end bus bar frame plate 31 is a hollow plate body and is provided with pole holes 312 corresponding to the poles 211 on the front end surface of the cell array 102. Around the pole post hole 312, the front surface of the front-end piece frame plate 31 is provided with a piece groove 311 and a tab groove 313, and the back surface is provided with a collecting plate avoiding groove 314. Wherein the pole lug slots 313 correspond to the two pole post holes 312 at the extreme sides. The even pole holes 312 in the middle are arranged by arranging one bar piece slot 311 according to two adjacent pole holes 312, so that the bar piece slot 311 is communicated with the two adjacent pole holes 312. The strap slot 311 is used to receive the strap 32. The tab groove 313 is for receiving the output electrode tab 33. The collecting plate avoiding groove 314 is used for accommodating the single-core collecting plate 22 at the end of the battery cell 21.

Referring to fig. 5, the back surface of the front-end bus bar plate 31 is closely attached to the front end surface of the cell array 102. The single-core collecting plate 22 on the front end face of the cell array 102 is accommodated in the collecting plate avoiding groove 314, and the pole 211 on the front end face of the cell array 102 passes through the pole hole 312, so that the front-end bus bar plate 31 can be tightly attached to the front end face of the cell array 102. The pole 211 passing through the pole hole 312 is fixedly connected to the serial bus bar 32 received in the bar slot 311, or fixedly connected to the output electrode tab 33 received in the tab slot 313. In this embodiment, the pole 211 is connected to the tandem bus bar 32 by welding, and the output electrode tab 33 is connected to the pole 211 by welding.

The front insulating plate 34 is provided between the front inner side plate 35 and the front leg frame plate 31, and is in close contact with the front inner side plate 35 and the front leg frame plate 31. The front inner panel 35 is disposed between the front insulating panel 34 and the front end panel 36, and is in close contact with the front insulating panel 34 and the front end panel 36. The front end insulating plate 34, the front end inner side plate 35, and the front end plate 36 are all plate structures. The front end insulating plate 34 is provided with a tab hole 341. A tab support 37 is provided on the front end plate 36. Specifically, the front end plate 36 is a plate body with a certain thickness, and is hollowed out along the plate body direction. Support grooves 361 are formed in the top of the front end plate 36, and tab seat insertion holes 362 are formed in the support grooves 361. The tab support member 37 includes a tab support groove 371 and a tab receptacle 372. The tab support groove 371 is provided on the tab holder 372. The tab support groove 371 is received in the support groove 361 by inserting the tab seat insert 372 into the tab seat insert hole 362, and the tab support 37 is fixed to the front end plate 36. The output electrode tab 33 is a bent tab, one end of which is accommodated in the tab groove 313 of the front-end tab frame plate 31 and fixed to the tab 211, and the other end of which is inserted through the tab hole 341 of the front-end insulating plate 34 and accommodated in the tab support groove 371 of the tab support 37. The front end plate 36 is fixedly connected with the port frame 101. Specifically, the side plate 12 has side plate end extensions 121 at both ends, which have a length greater than the top plate 11 and the bottom plate 13. The two front end plate side faces 363 of the front end plate 36 are clamped between the side plate end extensions 121 at the front ends of the two side plates 12, and are connected to the side plate end extensions 121 by welding.

Referring to fig. 6, the structure of the rear leg frame plate 41 is similar to that of the front leg frame plate 31, except that the rear leg frame plate 41 does not have an ear slot, and thus the detailed structure of the rear leg frame plate 41 is not described in detail herein. The terminal 211 on the front end face of the cell array 102 passes through the terminal hole on the rear-end bus bar frame plate 41 and is fixedly connected to the serial bus bar 32 accommodated in the bus bar slot on the rear-end bus bar frame plate 41. The rear insulating plate 42 is provided between the rear inner side plate 43 and the rear leg frame plate 41, and is in close contact with the rear inner side plate 43 and the rear leg frame plate 41. The rear inner side plate 43 is disposed between the rear insulating plate 42 and the rear end plate 44, and is in close contact with the rear insulating plate 42 and the rear end plate 44. The rear insulating plate 42, the rear inner side plate 43, and the rear end plate 44 are all plate structures. The rear end plate 44 is fixedly connected with the port frame 101. Specifically, the two rear end plate sides 443 of the rear end plate 44 are clamped between the side plate end extensions 121 at the rear ends of the two side plates 12, and are welded to the side plate end extensions 121. The rear end plate 44 is a plate body having a certain thickness, and is hollowed out along the plate body direction. The top end of the rear end plate 44 is provided with an interface frame 53. The interface frame 53 includes an interface frame deck 531 and an interface frame receptacle 532. The interface shelf mount 532 is disposed below the interface shelf deck 531. The interface frame deck 531 is disposed on the back end plate 44 and secured to the back end plate 44 by inserting the interface frame mount receptacles 441 on the back end plate 44 through the interface frame mount receptacles 532. The collection interface 52 is provided on an interface rack deck 531 of the interface rack 53.

In summary, the structure of the front end of the battery module is similar to that of the rear end, except that the front end is provided with a tab serving as an output electrode, and the rear end is provided with a collection interface. The collection interface is a collection of the voltage detection terminal 222 and the temperature detection terminal 223 on the single-core collection plate 22, and is a low voltage compared to the output electrode, and the output electrode is a high voltage, so the front end of the battery module is also referred to as a high voltage end, and the rear end is also referred to as a low voltage end. That is, the high voltage end and the low voltage end of the battery module of the present invention are respectively located at both ends of the battery module, thereby achieving separation of low voltage and high voltage.

In addition, in the present embodiment, the battery cell 21 is packaged in an insulating package. Specifically, referring to fig. 3, 4 and 7, before the battery cells 21 are connected in series to form the battery cell string 200, an insulating film 213 is laid on the surfaces of the battery cells 21 except for the portions of the poles 211, and the battery cell protective frames 23 are disposed at two ends of the battery cells 21. The insulating film 213 is usually made of PET or PI material. PET is also a polyester resin, PI is also a polyimide. The cell protection frame 23, referring to fig. 12, includes an end surface support plate 231, a side surface support plate 232, a top surface support plate 233, and a bottom surface support plate 234 connected to each other. The end face supporting plate 231 is a hollowed plate body, and the hollowed plate body comprises a pole collecting plate avoiding hole 235. The end face supporting plate 231 is tightly attached to the end faces of the two ends of the battery cell 21, and the pole 211 and the single-core collecting plate 222 on the end faces of the two ends of the battery cell 21 penetrate through the pole collecting plate avoiding hole 235. The side surface supporting plate 232, the top surface supporting plate 233 and the bottom surface supporting plate 234 are respectively tightly attached to the side surface, the top surface and the bottom surface of the battery cell 21, so that the battery cell 21 is supported by the battery cell support frame 23, and the battery cell 21 is insulated from the four-surface plate bodies of the oral plate frame 101.

Further, a heat conduction layer 15 is further disposed below the cell array 102. Referring to fig. 4, in the present embodiment, the heat conductive layer 15 is a plate made of aluminum or copper. The bottom of each cell 21 of the cell array 102 is disposed on the heat conducting layer 15 through a heat conducting insulating structural adhesive 151. Therefore, when the temperature of the battery cell 21 is too high, heat can be dissipated through the heat conducting and insulating structural adhesive 151 and the heat conducting layer 15; when electric core 21 temperature was crossed lowly, can be through heating the battery module, the heat of heating transmits to electric core 21 through heat conduction insulating structure glue 151 and heat-conducting layer 15. Those skilled in the art understand that the heat conductive layer 15, which is a heat conductive function, may also be directly bonded with a heat conductive and insulating structural adhesive.

Further, the positive terminal 21P of the top surface of each cell 21 of the cell array 102 is provided with an explosion-proof valve 212. A plurality of explosion holes 14 are formed in a top plate 11 of the port frame 101. The positions of the burst openings 14 correspond to the positions of the burst valves 212 of the respective cells 21, so that the burst valves 212 on the respective cells 21 are aligned with the corresponding burst openings 14. Therefore, when the cell 21 is overcharged, overdischarged or the like, or the gas is generated in the cell due to overheating or expands due to heating, so that the explosion-proof valve 212 explodes, the heat is released through the explosion opening 14 after passing through the hollow hole of the collection support frame 16.

Further, a cushion pad 29 is provided between the cell 21 of the cell string 200 and the cell 21 of the adjacent cell string 200. The cushion pad 29 is bonded to the side of the battery cell 21 by structural adhesive. The lateral support bars 511 of the collecting and collecting frame 51 are provided with corresponding buffer bridges 514 at corresponding positions above the buffer pads 29. The buffer bridges 514 are upward protrusions on the lateral support bars 511.

Further, a fastening mechanism is arranged between the terminal connector 513 and the voltage detection terminal 222 or the temperature detection terminal 223, and the locking of the insertion is realized through the fastening mechanism. Fig. 13 shows an example of insertion of the terminal fitting 513 into the voltage detection terminal 222 and the temperature detection terminal 223. As shown in fig. 13, the voltage detection terminal 222 and the temperature detection terminal 223 include a terminal case 61 and a connector pin 62 provided inside the terminal case 61. Wherein, a contact pin 62 is arranged in the terminal shell 61 of the voltage detection terminal 222; two separated connector pins 62 are provided in the terminal case 61 of the temperature detection terminal 223, see the connector pins shown by the broken lines in fig. 13. The terminal case 61 is square and is provided with a plug accommodating chamber 63 having an open top end. The contact pins 62 are received in the plug receiving cavities 63 and are arranged vertically. The side plate of the terminal case 61 is provided with a snap opening 64. The terminal fitting 513 includes a plug main body 91 and a spring plate 92. The plug main body 91 has a square structure. There are two spring plates 92. The two spring plates 92 are respectively disposed on the two side surfaces of the plug main body 91 facing back. The spring plate 92 is provided with a snap projection 93. When the plug main body 91 of the terminal fitting 513 is inserted into the plug accommodating chamber 62, the spring plate 92 is contracted inward, and the snap projections 93 on the spring plate 92 are snapped into the snap openings 64 depending on the elasticity of the spring plate 92 itself. The snap mechanism consists of a snap opening 64, a spring plate 92 and a snap projection 93.

Further, referring to fig. 7 and 14, a pole groove 2111 is provided in the pole 211 of the cell 21. The serially connected fins 32 are provided with a locking protrusion 321. The locking convex strip 32 is a convex strip formed by bending the tandem connection bars. The locking rib 32 is locked in the pole groove 2111.

Further, front end mounting holes 364 are provided on both sides of the front end plate 36, and rear end mounting holes 444 are provided on both sides of the rear end plate 44. Therefore, the battery module can be fixedly connected with the battery pack case by arranging bolts through the front end mounting hole 364 and the rear end mounting hole 444.

In addition, it should be noted that in the present embodiment, two battery cells 21 are connected in series in each battery cell string 200, and those skilled in the art understand that in practical applications, each battery cell string 200 may also be formed by connecting three, four, or five battery cells in series.

In addition, it should be noted that in this embodiment, the voltage detection terminal 222 on the single core collecting plate 22 disposed at the negative end of the battery cell 21 only applies the connection interface connected to the negative end terminal post 211 of the battery cell 21, and the measurement battery cell 21 needs to be connected to the positive and negative electrodes of the battery cell 21. For this reason, in the present embodiment, a single-core collecting plate 22 is also provided on the total positive end cell end face formed by serially connecting the cells 21 of the battery module, and the single-core collecting plate 22 is only used for connecting the voltage detection terminal 222. The total positive terminal cell end face is also the positive terminal end face of the cell 21 connected to the output electrode tab 33 connected to the positive terminal of the output electrode of the battery module. Therefore, the voltage detection of the battery cell 21 connected with the output electrode tab 33 connected with the positive electrode of the output electrode of the battery module is realized by detecting the voltage between the voltage detection terminals 222 connected with the positive and negative electrode posts 211 of the battery cell 21; the voltage detection of the other battery cells 21 is performed by detecting the voltage between the voltage detection terminals 222 to which the negative terminal posts 21 of the two battery cells 21 connected in series are connected.

Claims

1. A battery module based on a battery cell string is characterized by comprising a mouth-shaped plate frame and a battery cell array; the port-shaped plate frame is a plate frame which is enclosed by strip-shaped plate bodies on four sides and is provided with openings at two ends; two ends of the port-shaped plate frame are respectively a front end and a rear end; the battery cell array is a square array formed by an even number of battery cell strings; sealing the battery cell array in the port plate frame through a front end assembly arranged at a front end opening and a rear end assembly arranged at a rear end opening; the front end assembly includes an output electrode tab; the battery cell string comprises a plurality of battery cells; the battery cell is in a strip square structure, and the polar columns of the two electrodes are respectively positioned at the two ends of the battery cell; the battery cell string is formed by welding and then connecting a pole of the positive electrode of one battery cell and a pole of the negative electrode of the other battery cell in series; two ends of the battery cell string are respectively positioned at the front end and the rear end; the polarity directions of the electrodes of the adjacent battery cell strings are opposite; the terminal posts of the end electrodes of the adjacent cell strings are connected in series; the electric core strings at the most edges of the two sides are respectively connected with the output electrode lugs at the front ends.

2. The cell string-based battery module of claim 1, wherein the front end assembly further comprises a front end buss frame plate, a tandem buss, a front end insulation plate, and a front end header plate; a lug supporting piece is arranged on the front end plate and is fixedly connected with the port plate frame; the front-end bus bar frame plate is arranged close to the front end face of the battery cell array; the serial connection bus bar is arranged in the bus bar groove of the front-end bus bar frame plate and is connected with a pole of an electrode at the end part of the battery cell string; the front end insulating plate is arranged between the front end bus piece frame plate and the front end plate and is tightly attached to the front end bus piece frame plate; one end of the output electrode lug is arranged in a lug groove of the front-end bus sheet frame plate and is connected with a pole of the electrode at the end part of the electric core string, and the other end of the output electrode lug passes through a lug hole on the front-end insulating plate and then is arranged on the lug support piece.

3. The cell string-based battery module of claim 2, wherein the back end assembly comprises a back end buss frame plate, a tandem buss, a back end insulation plate, and a back end plate; the rear end plate is fixedly connected with the port plate frame; the rear-end bus bar frame plate is arranged close to the rear end face of the battery cell array; the serial connection bus bar is arranged in the bus bar groove of the rear-end bus bar frame plate and is connected with a pole of an electrode at the end part of the battery cell string; the rear end insulating plate is arranged between the rear end bus piece frame plate and the rear end plate and clings to the rear end bus piece frame plate.

4. The battery module based on the battery cell string according to claim 3, wherein a single-core collecting plate is arranged at the negative electrode end of the battery cell; the single-core collecting plate comprises a back plate, a voltage detection terminal, a temperature sensor, a voltage pole column laminating plate and a heat conduction pole column laminating plate; the back plate is tightly attached to the end face of the negative electrode end of the battery cell; the voltage detection terminal, the temperature sensor, the voltage pole column laminating plate and the heat conduction pole column laminating plate are arranged on the back plate; the voltage pole post fitting plate and the heat-conducting pole post fitting plate are connected with a pole post at the negative end of the battery core; the voltage detection terminal is electrically connected with the voltage pole fitting plate; the temperature detection terminal is electrically connected with the temperature sensor; the heat-conducting pole column laminating plate is connected with the temperature sensor through the heat-conducting layer.

5. The battery module based on the cell string of claim 4, further comprising a collection frame; the collecting and collecting frame comprises a collecting interface and a plurality of terminal connectors; the terminal joint corresponds to and is connected with the voltage detection terminal and the temperature detection terminal of the single-core acquisition board on the battery core; each terminal fitting is connected to the collection interface.

6. The battery module based on the cell string of claim 5, wherein the rear end plate is provided with an interface frame; the collection interface is arranged on the interface frame.

7. The battery module based on the cell string of claim 5, wherein the voltage detection terminal and the temperature detection terminal comprise a terminal housing and a contact pin disposed in the terminal housing; the terminal shell of the voltage detection terminal is internally provided with a connecting pin, and the terminal shell of the temperature detection terminal is internally provided with two separated connecting pins; the terminal shell is square and is provided with a plug accommodating cavity with an opening at the top end; the contact pins are accommodated in the plug accommodating cavities and are vertically arranged; a buckle opening is formed in a side plate of the terminal shell; the terminal fitting includes a plug main body and a spring plate; the plug main body is of a square structure; the number of the spring plates is two; the two spring plates are respectively arranged on the back-facing side surfaces of the two sides of the plug main body; the spring plate is provided with a hasp protrusion; when the plug main body of the terminal connector is inserted into the plug accommodating cavity, the spring plate contracts inwards and is made to be clamped into the buckle opening by means of elasticity of the spring plate.

8. The battery module based on the cell string of claim 5, wherein the collection and collection frame further comprises lateral support bars and longitudinal support bars disposed on a top surface of the cell array; the terminal connectors are arranged on the transverse supporting bars and the longitudinal supporting bars; the longitudinal support bars are arranged along the front end and the rear end of the battery module and are connected with and perpendicular to the transverse support bars; the collection port is connected to the transverse support bar.

9. The battery module of claim 8, wherein a cushion pad is disposed between the cells of the cell string and the cells of the adjacent cell string; the transverse supporting bars are provided with buffering convex bridges.

10. The battery module based on a battery cell string according to claim 8, wherein a collection support frame is further disposed between the collection frame and a top plate of the window frame.

11. The battery module based on the cell string of claim 1, wherein the surface of the cell is provided with a layer of insulating film; cell protection frames are arranged at two ends of the cell; the battery cell protection frame is used for making the battery cell overhead, so that the battery cell is insulated and isolated from the four-surface plate body of the mouth-shaped plate frame.

12. The battery module based on a battery cell string according to claim 10, wherein a heat conducting layer is further disposed between the battery cell and the bottom plate of the window frame.

13. The battery module based on the battery cell string according to claim 1, wherein an explosion-proof valve is disposed on a top surface of the battery cell; a plurality of explosion holes are formed in a top plate of the port-shaped plate frame; and the positions of the explosion holes correspond to the positions of the explosion-proof valves of the battery cores.