CN106654097B

CN106654097B - Battery pack

Info

Publication number: CN106654097B
Application number: CN201611144241.9A
Authority: CN
Inventors: 刘建军
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2016-12-13
Filing date: 2016-12-13
Publication date: 2023-03-17
Anticipated expiration: 2036-12-13
Also published as: CN106654097A

Abstract

The invention discloses a battery pack which comprises a shell, a heat dissipation assembly and a battery cell unit, wherein the battery cell unit is connected with an adjacent battery cell unit in the transverse direction or/and the longitudinal direction, and the battery cell unit is provided with a battery cell splicing piece. Through the mode, the battery pack can effectively dissipate heat and prevent the battery core from being damaged due to internal overheating after long-time use.

Description

Battery pack

Technical Field

The invention relates to the field of batteries, in particular to a battery pack.

Background

A battery pack with a plurality of cell units is used in particular as an energy reserve for garden tools. In order to ensure an optimum energy reserve, it is necessary to keep the temperature of the cell units within the required operating range. If the heat dissipation function is too poor, can lead to the inside overheated of battery package under the condition of long-time use, can influence the availability factor of electric core, still can cause electric core to be destroyed.

Disclosure of Invention

The invention mainly solves the technical problem of providing a battery pack which can effectively dissipate heat and prevent a battery cell from being damaged due to internal overheating after long-time use.

In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a battery pack, including casing, radiator unit, electric core unit is equipped with electric core splicing on the electric core unit transversely or/and vertically rather than adjacent electric core unit connection, its characterized in that, radiator unit is including locating the fan on the electric core unit, locating the air-supply line of fan air intake and locating the exhaust pipe of fan air outlet, fan and air-supply line intercommunication pass through the air-supply line with steam and inhale behind the air intake through the air outlet by the exhaust pipe with steam discharge.

In a preferred embodiment of the present invention, the air inlet pipe is disposed inside the cell unit, and absorbs hot air in the cell unit to the fan.

In a preferred embodiment of the present invention, the exhaust duct is installed outside the battery cell unit, and exhausts hot air to the outside of the battery cell unit.

In a preferred embodiment of the present invention, the air inlet pipe is provided with a plurality of air inlet slots for sucking hot air, and the air outlet pipe is provided with a plurality of air outlet slots for discharging hot air.

In a preferred embodiment of the present invention, the air inlet duct includes a heat collecting air duct, and the air inlet duct sucks hot air and delivers the hot air to the fan through the heat collecting air duct.

In a preferred embodiment of the present invention, the air inlet slots are spaced apart on the air inlet duct.

In a preferred embodiment of the present invention, the air inlet duct and the heat collecting duct are integrally formed.

In a preferred embodiment of the present invention, the exhaust grooves are spaced apart from each other on the exhaust pipe.

In a preferred embodiment of the present invention, the air exhaust groove is disposed between the outside of the battery cell unit and the inside of the casing, and the air exhaust groove dissipates hot air through the casing.

In a preferred embodiment of the present invention, the battery cell unit includes an upper frame, a lower frame, and a battery cell assembly, the upper frame and the lower frame are connected, the battery cell assembly is installed between the upper frame and the lower frame, and the battery cell assembly includes a plurality of battery cells arranged in a matrix.

In a preferred embodiment of the present invention, the upper support and the lower support of the cell unit are connected to the upper support and the lower support of the adjacent cell unit in the transverse and longitudinal directions, the cell unit is electrically connected to the cell unit adjacent thereto in the transverse and/or longitudinal directions through a connecting piece, and the connecting piece is detached from the cell unit to disconnect the cell unit.

In a preferred embodiment of the present invention, the cell connecting sheet includes a copper sheet plate and a nickel sheet plate, the copper sheet plate is combined on the nickel sheet plate, the copper sheet plate is provided with a plurality of through holes, the nickel sheet plate is provided with electrical connection ends corresponding to the through holes, the nickel sheet plate is provided with grooves corresponding to the electrical connection ends, the electrical connection ends are disposed inside the grooves, one end of each electrical connection end is connected with the nickel sheet plate, and the rest electrical connection ends are separated from the nickel sheet plate.

In a preferred embodiment of the present invention, the electrical connection end is further provided with a cell contact piece contacting with the cell, and the cell is electrically connected with the nickel plate through the cell contact piece and the electrical connection end.

In a preferred embodiment of the present invention, the electrical connection end is symmetrically provided with fusing grooves on left and right sides, and the electrical core is over-current to break the electrical connection end from the fusing grooves to disconnect the electrical core and the nickel plate from each other.

In a preferred embodiment of the present invention, the fuse groove is an arc groove disposed in the middle of the electrical connection end and recessed inwards.

In a preferred embodiment of the present invention, a sleeve is sleeved outside the electrical core, the sleeve is integrally formed with or detachably connected to the upper support or the lower support, and the upper support and the lower support are provided with mounting holes matched with the electrical core.

In a preferred embodiment of the present invention, the number of the sleeves is equal to the number of the battery cells.

In a preferred embodiment of the present invention, the cells are electrically connected to each other through a cell tab, and the cell tab of one cell unit is connected to the cell tab of another cell unit through a connection tab.

In a preferred embodiment of the present invention, a mounting plate is disposed on the cell tab, and the connection tab is cooperatively mounted on the mounting plate, so that the cell units are electrically connected to each other through the cell tab.

In a preferred embodiment of the present invention, a plurality of first mounting holes are formed in the upper bracket and the lower bracket, and a connecting rod is disposed in the first mounting hole to fix the plurality of battery cell units in the longitudinal direction.

In a preferred embodiment of the present invention, the upper bracket and the lower bracket are provided with mounting grooves, and after the upper bracket and the lower bracket are connected, a second mounting hole is formed between the upper bracket and the lower bracket of the adjacent cell unit, and the second mounting hole is provided with a connecting rod to fix the plurality of cell units in the transverse direction.

In a preferred embodiment of the present invention, the connecting rod is a screw.

In a preferred embodiment of the present invention, a shock absorbing element is disposed on the battery cell unit.

In a preferred embodiment of the present invention, the shock absorbing member is a rubber member.

In a preferred embodiment of the present invention, the battery pack is provided with a pressure release valve for balancing the air pressure inside the battery pack and the air pressure outside the battery pack.

In a preferred embodiment of the present invention, the pressure release valve flows the gas inside the battery pack to the outside when the internal pressure of the battery pack is higher than the external pressure, and flows the gas outside the battery pack to the inside when the internal pressure of the battery pack is lower than the external pressure.

In a preferred embodiment of the invention, when the pressure difference between the inside and the outside of the battery pack is greater than or equal to the set explosion value, the pressure relief valve is opened immediately to discharge the gas inside the battery pack smoothly.

In a preferred embodiment of the present invention, the pressure relief valve is further provided with a filter screen for preventing large particles from blocking the pressure relief opening.

In a preferred embodiment of the present invention, at least one heating assembly for heating the cell units is disposed in the housing.

In a preferred embodiment of the invention, a heating assembly is arranged in the shell and is positioned at the bottom of the shell.

In a preferred embodiment of the invention, the heating assembly includes a heating plate and an insulating pad disposed below the heating plate and spaced between the bottom housings.

In a preferred embodiment of the present invention, a plurality of heating plates are disposed in the casing, and the heating plates are correspondingly disposed at the bottom of each cell unit.

In a preferred embodiment of the present invention, the casing includes an upper cover and a lower cover, the upper cover and the lower cover are connected to the battery cell unit, the lower cover is provided with a sealing ring, and the upper cover is mounted on the lower cover and contacts with the sealing ring to form a sealing structure.

In a preferred embodiment of the present invention, the upper cover is connected to the upper cell unit by a fastening screw, and the lower cover is connected to the lower cell unit by a fastening screw.

In a preferred embodiment of the present invention, the lower cover, the sealing ring and the side surface of the upper cover are connected by fastening screws.

The invention has the beneficial effects that: the battery pack can effectively dissipate heat and prevent the battery cell from being damaged due to internal overheating after long-time use.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic perspective view of a battery pack according to a preferred embodiment of the invention;

fig. 2 is a partial structural view of the battery pack shown in fig. 1;

fig. 3 is a schematic view of a heat dissipation air duct structure of the battery pack shown in fig. 1;

fig. 4 is a partial structural view of the battery pack shown in fig. 1;

fig. 5 is a partial structural view of the battery pack shown in fig. 1;

FIG. 6 is a schematic view of the electric core assembly of the battery pack shown in FIG. 1;

FIG. 7 is a schematic structural view of another embodiment of the electrical core assembly of the battery pack shown in FIG. 1;

FIG. 8 is a schematic view of a portion of the structure of FIG. 1;

FIG. 9 is a schematic view of a portion of the structure of FIG. 1;

FIG. 10 is a partial schematic view of the structure of FIG. 1;

fig. 11 is a schematic diagram of a cell tab of the battery pack shown in fig. 1;

fig. 12 is a partial structural view of the cell tab shown in fig. 11;

fig. 13 is a partial structural view of a heat dissipation air duct of the battery pack shown in fig. 3;

fig. 14 is a sectional view of the battery pack shown in fig. 1;

fig. 15 is a partial structural view of the battery pack shown in fig. 1;

fig. 16 is a partial structural view of the battery pack shown in fig. 15;

fig. 17 is a partial structural view of the battery pack shown in fig. 1;

fig. 18 is a partial structural view of the battery pack shown in fig. 1;

fig. 19 is a partial structural schematic view of the battery pack shown in fig. 1;

fig. 20 is a partial structural view of the battery pack shown in fig. 1;

fig. 21 is a partial structural view of the battery pack shown in fig. 1;

fig. 22 is a partial structural view of the battery pack shown in fig. 1;

fig. 23 is an exploded view of the battery pack of fig. 1;

the parts in the drawings are numbered as follows:

1. the battery cell comprises a battery cell unit, 11, an upper bracket, 12, a lower bracket, 13, a battery core assembly, 14, a first mounting hole, 15, a mounting groove, 16, a second mounting hole, 17, a connecting rod, 18, a sleeve, 19, a battery cell contact piece, 20, a connecting piece, 21, a mounting plate, 191, a copper sheet plate, 192, a nickel sheet plate, 193, a through hole, 194, a groove, 195, a fusing groove, 196, an electrical connecting end, 197, a battery cell contact piece, 2, a heat dissipation assembly, 201, a fan, 202, an air inlet pipe, 203, an exhaust pipe, 204, an air inlet groove, 205, a heat collection air pipe, 206, an exhaust groove, 3, a damping element, 4, a pressure relief valve, 41, a filter screen, 5, a shell, 51, an upper cover, 52, a lower cover, 53, a sealing ring, 54, a screw, 6, a heating assembly, 61, a heating plate, 62 and a heat insulation pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a battery pack includes a plurality of cell units 1 connected together, each cell unit 1 is connected to an adjacent cell unit 1, each cell unit 1 includes an upper bracket 11 and a lower bracket 12 connected to each other and a cell assembly 13 disposed between the upper bracket 11 and the lower bracket 12, and the upper bracket 11 and the lower bracket 12 of a cell unit 1 are connected to the upper bracket 11 and the lower bracket 12 of an adjacent cell unit 1 in the transverse and longitudinal directions.

In addition, a plurality of first mounting holes 14 are formed in the upper bracket 11 and the lower bracket 12, and a connecting rod 17 is provided in each first mounting hole 14 to fix the plurality of battery cell units 1 in the longitudinal direction.

In addition, the upper support 11 and the lower support 12 are provided with mounting grooves 15, the upper support 11 and the lower support 12 are connected to form second mounting holes 16 with the upper support 11 and the lower support 12 of the adjacent cell units 1, and the second mounting holes 16 are provided with connecting rods 17 to fix the plurality of cell units 1 in the transverse direction. The connecting rod 17 is a screw. The screw connection can be convenient and fast fixed electric core unit 1, and the fixing mode is simple, safe and reliable.

Electric core unit 1 includes upper bracket 11, lower carriage 12 and electric core subassembly 13, and upper bracket 11 is connected with lower carriage 12, and electric core subassembly 13 is installed between upper bracket 11 and lower carriage 12, and electric core subassembly 13 includes that a plurality of electric core matrixes arrange to form, and every electric core outside cover is equipped with sleeve 18.

In addition, the sleeve 18 is integrally formed with or detachably connected to the upper support 11 or the lower support 12, and mounting holes matched with the battery cell are formed in the upper support 11 and the lower support 12.

In addition, the number of sleeves 18 is equal to the number of cells. The sleeve 18 is used for correspondingly protecting the battery cells arranged in the sleeve, and preventing one battery cell from being damaged and other battery cells from being damaged.

In addition, the cell assembly 13 includes 30 cells arranged in 5 rows and 6 columns.

In addition, the electric cores are electrically connected with each other through electric core splicing pieces 19 arranged on the upper bracket 11 and the lower bracket 12.

In addition, the battery cell units 1 are arranged and connected in sequence in the transverse direction and the longitudinal direction, the battery cell units 1 adjacent to the battery cell units 1 in the transverse direction or/and the longitudinal direction are electrically connected through the connecting sheets 20, and the connecting sheets 20 are detached from the battery cell units 1 to disconnect the battery cell units 1.

In addition, a cell contact piece 19 is arranged on the cell unit 1, and the cell contact piece 19 of the cell unit 1 is connected with the cell contact piece 19 of another cell unit 1 through a connection piece 20.

In addition, after the cell units 1 are sequentially electrically connected in the longitudinal direction by the connecting pieces 20, the lowermost cell unit 1 is electrically connected to the transversely adjacent cell units 1 by the connecting pieces 20, and the uppermost cell unit 1 is electrically connected to the transversely adjacent cell unit 1 by the connecting pieces 20.

In addition, a mounting plate 21 is arranged on the cell splicing sheet 19, and the connecting sheet 20 is mounted on the mounting plate 21 in a matching manner, so that the cell units 1 are electrically connected through the cell splicing sheet 19. The maintenance and replacement of the cell unit 1 can be facilitated by detaching a certain cell unit 1 with the connecting sheet 20 disconnected individually.

The cell splicing sheet 19 comprises a copper sheet plate 191 and a nickel sheet plate 192, the copper sheet plate 191 is compounded on the nickel sheet plate 192, a plurality of through holes 193 are formed in the copper sheet plate 191, electrical connection ends 196 corresponding to the through holes 193 are formed in the nickel sheet plate 192, grooves 194 corresponding to the electrical connection ends 196 are formed in the nickel sheet plate 192, the electrical connection ends 196 are arranged on the inner sides of the grooves 194, one ends of the electrical connection ends are connected with the nickel sheet plate 192, and the rest parts of the electrical connection ends are separated from the nickel sheet plate 192.

In addition, the electrical connection end 196 is further provided with a battery cell contact 197 contacting with the battery cell, and the battery cell is electrically connected with the nickel plate 192 through the battery cell contact 197 and the electrical connection end 196.

In addition, fusing grooves 195 are symmetrically arranged on the left side and the right side of the electrical connecting end 196, and the electrical connecting end 196 is broken from the fusing grooves 195 due to overcurrent, so that the power-on state of the battery cell and the nickel sheet plate 192 is disconnected.

Additionally, the fuse groove 195 is an arc-shaped groove formed in the middle of the electrical connection terminals 196 and recessed inward. When the cell unit 1 is overcurrent, the fuse groove 195 of the electrical connection terminal 196 is broken, so that the electrical connection terminal 196 is broken into two sections, power supply to the cell is cut off, and the cell unit is prevented from being damaged integrally.

The battery pack further comprises a heat dissipation assembly 2 used for dissipating heat of the plurality of battery cell units 1, the heat dissipation assembly 2 comprises a fan 201 arranged on the battery cell units 1, an air inlet pipe 202 arranged at an air inlet of the fan 201 and an exhaust pipe 203 arranged at an air outlet of the fan 201, and the fan 201 is communicated with the air inlet pipe 202 to suck hot air into the air inlet through the air inlet pipe 202 and then discharge the hot air through the air outlet and the exhaust pipe 203.

In addition, the air inlet duct 202 is disposed inside the cell unit 1, and absorbs hot air from the cell core assembly 13 in the cell unit 1 to the fan 201. The air inlet pipe 202 is provided with a plurality of air inlet slots 204 for absorbing hot air, the air inlet pipe 202 comprises a heat collecting air pipe 205 and a plurality of air inlet pipes 202 connected to the lower end of the heat collecting air pipe 205, and the air inlet pipe 202 absorbs hot air and conveys the hot air to the fan 201 through the heat collecting air pipe 205. The air inlet slots 204 are arranged on the air inlet pipe 202 at intervals, and the air inlet slots 204 radiate heat of hot air through the shell. The number of the air inlet pipes 202 is 4, and the air inlet pipes 202 and the heat collecting air pipes 205 are integrally formed.

In addition, the exhaust duct 203 is installed outside the cell unit, and exhausts hot air to the outside of the cell unit. The exhaust duct 203 is provided with a plurality of exhaust grooves 206 for exhausting hot air. The exhaust ducts 206 are spaced from the exhaust duct 203. The exhaust groove 206 is arranged between the outer side of the cell unit and the inner side of the housing, the fan 201 is started, the air inlet pipe 202 sucks hot air in the battery pack through the air inlet groove 204 and then exhausts the hot air to the exhaust pipe 203 through the fan 201, and the exhaust pipe 203 exhausts the hot air through the exhaust groove 206 to dissipate heat inside.

In addition, the upper end face and the lower end face of each battery cell unit 1 are provided with a damping element 3, the left side and the right side of the battery pack are provided with a plurality of damping elements 3, the damping elements 3 are arranged at the joints of the battery cell units 1 which are adjacent up and down, the front side and the rear side of the battery pack are provided with a plurality of damping elements 3, and the damping elements 3 are longitudinally arranged at the joints of the battery cell units 1 which are adjacent left and right.

In addition, the damping element 3 may be in the shape of a grid, a strip, or a block, and the damping element 3 is a rubber member. The shock absorbing member 3 can effectively reduce the impact of the battery pack caused by the turnover.

Further, the battery pack is provided with a relief valve 4 for balancing the internal air pressure and the external air pressure of the battery pack. The inside atmospheric pressure of battery package is higher than outside atmospheric pressure, and the gaseous outflow to the external world through relief valve 4 that passes through in the battery package reduces the atmospheric pressure in the battery package in order to prevent that the battery package from bulging, and the inside atmospheric pressure of battery package is less than outside atmospheric pressure, and the outside gaseous of battery package flows into to inside through relief valve 4, and the atmospheric pressure in the rising battery package is in order to prevent the flat package of battery package. Whole process, only gaseous interchange can not go because the condensation becomes the water droplet and go when steam passes through this valve, has fine water-proof effects, realizes waterproof ventilative state.

In addition, the inside and outside atmospheric pressure difference more than or equal to the blast value of setting for of battery package, relief valve 4 opens and to discharge the inside gas of battery package system in order to prevent the battery package explosion, and the effectual electric core that prevents fires leads to inside atmospheric pressure to rise sharply and arouse whole package explosion. And when the air pressure difference between the inside and the outside of the battery pack is smaller than the set explosion, the normal waterproof and breathable state is recovered.

In addition, the pressure relief valve 4 is also provided with a filter screen 41 for preventing large particles from blocking the pressure relief opening.

In addition, at least one heating assembly 6 for heating the cell unit 1 is provided in the housing 5.

In addition, a heating assembly 6 is arranged in the shell 5, and the heating assembly 6 is positioned at the bottom of the shell 5.

In addition, the bottom heating module 6 includes a heating plate 61 and a heat insulating mat 62, and the heat insulating mat 62 is disposed below the heating plate 61 and spaced between the bottom housings.

In addition, a plurality of heating plates 61 are arranged in the casing 5, and the heating plates 61 are correspondingly arranged at the bottom of each cell unit 1. Prevent that battery package temperature is too low can not normally work.

In addition, the housing 5 includes an upper cover 51 and a lower cover 52, the upper cover 51 and the lower cover 52 are connected to the battery cell 1, a gasket 53 is mounted on the lower cover 52, and the upper cover 51 is mounted on the lower cover 52 and contacts with the gasket 53 to form a sealing structure.

The upper cover 51 is connected to the upper cell unit 1 by a fastening screw 54, and the lower cover 52 is connected to the lower cell unit 1 by a fastening screw 54.

The lower cover 52, the packing 53, and the side surface of the upper cover 51 are connected by fastening screws 54. The battery pack transfers the load to the upper cover assembly 51 (steel structure) through the suspension effect of the upper fixing screws 54, so that the vibration resistance and other mechanical properties of the lithium battery pack are improved.

Compared with the prior art, the battery pack provided by the invention can ensure safe use, is convenient to disassemble and assemble, is convenient to maintain and has a long service life.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a battery pack, includes casing, radiator unit, electric core unit, and electric core unit is equipped with electric core splicing in electric core unit rather than the adjacent electric core unit connection in horizontal or/and vertical, its characterized in that, radiator unit is including locating fan on the electric core unit, locating the air-supply line of fan air intake and locating the exhaust pipe of fan air outlet, the fan is discharged steam through the air outlet by the exhaust pipe after inhaling the air intake with steam through the air-supply line with the air-supply line intercommunication, be equipped with a plurality of air inlet grooves that are used for inhaling steam on the vertical direction of air-supply line, be equipped with a plurality of exhaust grooves that are used for the exhaust steam on the vertical direction of exhaust pipe.

2. The battery pack of claim 1, wherein the air inlet duct is disposed inside the cell unit to absorb hot air in the cell unit to the fan.

3. The battery pack according to claim 2, wherein the exhaust duct is installed outside the cell unit to exhaust hot air to the outside of the cell unit.

4. The battery pack of claim 3, wherein the air inlet duct includes a heat collection air duct, the air inlet duct drawing hot air through the heat collection air duct to deliver the hot air to the fan.

5. The battery pack of claim 4, wherein the air inlet slots are spaced on the air inlet duct.

6. The battery pack of claim 5, wherein the air inlet duct and the heat collection duct are integrally formed.

7. The battery pack of claim 5, wherein the vent grooves are spaced on the vent tube.

8. The battery pack of claim 7, wherein the vent channel is disposed between an exterior side of the cell unit and an interior side of the housing, the vent channel dissipating hot air through the housing.

9. The battery pack of claim 1, wherein the cell unit comprises an upper frame, a lower frame and a cell assembly, the upper frame and the lower frame are connected, the cell assembly is installed between the upper frame and the lower frame, and the cell assembly comprises a plurality of cells arranged in a matrix.

10. The battery pack of claim 9, wherein the upper and lower frames of the cell units are connected to the upper and lower frames of adjacent cell units in the transverse and longitudinal directions, and the cell units are electrically connected to the adjacent cell units in the transverse and/or longitudinal directions by connecting pieces, and the connecting pieces are detached from the cell units to disconnect the cell units.

11. The battery pack according to claim 1, wherein the cell tab comprises a copper sheet plate and a nickel sheet plate, the copper sheet plate is combined on the nickel sheet plate, the copper sheet plate is provided with a plurality of through holes, the nickel sheet plate is provided with electrical connection ends corresponding to the through holes, the nickel sheet plate is provided with grooves corresponding to the electrical connection ends, the electrical connection ends are arranged inside the grooves, one end of the electrical connection ends is connected with the nickel sheet plate, and the rest of the electrical connection ends are separated from the nickel sheet plate.

12. The battery pack of claim 11, wherein the electrical connection end further comprises a cell contact strip contacting the cell, and the cell is electrically connected to the nickel plate through the cell contact strip and the electrical connection end.

13. The battery pack according to claim 11, wherein the electrical connection terminals are symmetrically provided with fusing grooves at left and right sides, and the cell is over-current to break the electrical connection terminals from the fusing grooves so as to disconnect the power-on states of the cell and the nickel plate.

14. The battery pack of claim 13, wherein the fuse groove is an arc-shaped groove provided at a middle portion of the electrical connection end and recessed inward.

15. The battery pack according to claim 9, wherein a sleeve is sleeved outside the battery cell, the sleeve is integrally formed with or detachably connected to the upper support or the lower support, and the upper support and the lower support are provided with mounting holes matched with the battery cell.

16. The battery pack of claim 15, wherein the number of sleeves and the number of cells are equal.

17. The battery pack of claim 10, wherein the cells are electrically connected to one another via cell tabs, and the cell tabs of one cell unit are connected to the cell tabs of another cell unit via connecting tabs.

18. The battery pack of claim 17, wherein the cell tabs are provided with mounting plates, and the connecting pieces are cooperatively mounted on the mounting plates to electrically connect the cell units through the cell tabs.

19. The battery pack of claim 9, wherein the upper and lower frames are provided with a plurality of first mounting holes, and the first mounting holes are provided with connecting rods to longitudinally fix the plurality of cell units.

20. The battery pack of claim 19, wherein the upper and lower frames are provided with mounting slots, and form second mounting holes with the upper and lower frames of the adjacent cell units after being connected, and the second mounting holes are provided with connecting rods to fix the plurality of cell units in the transverse direction.

21. The battery pack of claim 20, wherein the connecting rod is a threaded rod.

22. The battery pack of claim 1, wherein the cell units are provided with shock absorbing elements.

23. The battery pack of claim 22, wherein the shock absorbing member is a rubber member.

24. The battery pack according to claim 1, wherein the battery pack is provided with a pressure release valve for balancing air pressure inside the battery pack and air pressure outside the battery pack.

25. The battery pack according to claim 24, wherein the pressure release valve allows gas inside the battery pack to flow out to the outside when the internal pressure of the battery pack is higher than the external pressure, and allows gas outside the battery pack to flow in when the internal pressure of the battery pack is lower than the external pressure.

26. The battery pack of claim 25, wherein when the difference between the internal pressure and the external pressure of the battery pack is greater than or equal to the set burst value, the pressure release valve is immediately opened to discharge the gas inside the battery pack smoothly.

27. The battery pack of claim 26, wherein the pressure relief valve further comprises a filter screen for preventing large particles from blocking the pressure relief opening.

28. The battery pack of claim 1, wherein at least one heating assembly is disposed within the housing for heating the cell units.

29. The battery pack of claim 28, wherein the housing includes a heating assembly disposed therein, the heating assembly being disposed at a bottom of the housing.

30. The battery pack of claim 29, wherein the heating assembly comprises a heating plate and a thermal insulating mat disposed below the heating plate and spaced between the bottom housings.

31. The battery pack of claim 30, wherein a plurality of heating plates are disposed in the housing, and the heating plates are correspondingly disposed at the bottom of each cell unit.

32. The battery pack of claim 1, wherein the housing comprises an upper cover and a lower cover, the upper cover and the lower cover are connected with the cell unit, the lower cover is provided with a sealing ring, and the upper cover is arranged on the lower cover and is in contact with the sealing ring to form a sealing structure.

33. The battery pack of claim 32, wherein the upper cover is connected to the upper cell unit by a fastening screw, and the lower cover is connected to the lower cell unit by a fastening screw.

34. The battery pack of claim 33, wherein the lower cover, the sealing ring, and the side surface of the upper cover are coupled to each other by fastening screws.