CN216872194U

CN216872194U - High-capacity battery

Info

Publication number: CN216872194U
Application number: CN202122416606.1U
Authority: CN
Inventors: 韩晓宇; 蔡潇; 雷政军; 翟腾飞; 刘毅; 郑高锋
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-07-01
Anticipated expiration: 2031-10-08

Abstract

The application discloses a high-capacity battery, which comprises a shell, a battery pack arranged in the shell and a heat exchange device arranged outside the shell; the heat exchange device comprises a semiconductor module arranged on the outer side of the upper cover plate of the shell and two identical heat dissipation assemblies arranged in the shell, and the condensation ends of the heat dissipation assemblies extend out of the upper cover plate of the shell to be connected with the semiconductor module; the heat dissipation assembly comprises a conductive bar connected with the positive electrode or the negative electrode of the battery pack, a hollow pole column connected with the conductive bar and provided with an outer wall groove, and a heat conduction fire extinguishing pipe arranged in the outer wall groove.

Description

High-capacity battery

Technical Field

The application relates to the field of batteries, in particular to a high-capacity lithium ion battery and an assembling method thereof.

Background

In existing lithium battery applications, the use of super-large capacity batteries is often involved. The mainstream square lithium battery of high capacity monomer in the existing market is 300Ah, the monomer cylinder battery of maximum capacity is not more than 100Ah, receive the influence of monomer battery capacity, the lithium cell need connect in parallel a plurality of monomer batteries when the energy storage is used and realize that required capacity requires, to super large capacity energy storage battery system, in order to realize its super large capacity demand, just need to use a large amount of monomer batteries to connect in parallel and constitute battery module, establish ties with other battery modules again and carry out the series-parallel connection of a plurality of monomer batteries with the voltage that improves whole battery system. When the high-capacity lithium battery is manufactured, a plurality of groups of battery cells need to be connected in parallel, if the plurality of groups of battery cells are not connected and aligned properly in the parallel connection process, performance parameters such as capacity, resistance and voltage of the battery cells are easily uneven, or if one of the battery cells has a quality problem, the performance of the whole high-capacity battery is affected, so that the consistency of the parallel connection of the battery cells is poor, the performance of the high-capacity battery is unstable, and the rejection rate is high; meanwhile, most of the existing high-capacity lithium batteries are filled and used with electrolyte independently, so that the overall working performance of the high-capacity lithium batteries is poor.

At present current large capacity lithium ion battery, most are through parallelly connected a large capacity lithium ion battery of formation with a plurality of small capacity batteries, and large capacity lithium ion battery is when using, just can satisfy the power consumption demand after need passing through the series connection again, thereby make and connect spare and accessory part kind numerous, it is loaded down with trivial details to connect the step complicacy, consuming time and wasting force, battery management system and wire rod, the quantity of battery box is huge, cause the energy storage cost to be high or low, and this kind of connected mode is because of its connecting wire is numerous and diverse, the internal resistance is different, cause the current difference, arouse the battery very easily and generate heat, the uniformity of battery can be more and more poor after long-term the use, not only there is the potential safety hazard, and seriously influence the life of battery.

CN 211957777U provides a large capacity battery, which is characterized in that 30 lithium iron phosphate anode-graphite cathode roll core bodies are made into 3.2V,450Ah roll core groups, liquid absorption plates and liquid absorption rods are added to make roll core clusters, and then 4 roll core clusters are connected in parallel to form a roll core stack, so that the 3.2V1800Ah ultra-large capacity battery is manufactured. The square single battery of a plurality of 280Ah that this application is directly parallelly connected has that mounting process is simple, and the connecting piece is few, and the group battery temperature is controllable, the quality is reliable, characteristics such as with low costs.

CN 104883861a discloses a large-capacity battery with a heat dissipation device, which is to plug a plurality of heat dissipation fins with clips into the gaps between a plurality of cylindrical batteries connected in parallel, and the heat dissipation fins are tightly attached to the cylindrical battery cells, thereby improving the heat dissipation efficiency of the battery and ensuring the internal temperature of the battery to be consistent. This application large capacity battery heat radiation structure is simple, and monomer pond is small in quantity, and the fault rate is little, and the yield is high, relies on the outside TEC semiconductor refrigeration heat dissipation module pipe control battery inside temperature of group battery, and the passband has the utmost point post design of cavity and outer wall recess, is equipped with the soaking row in the cavity, and the heating plate imbeds heat conduction fire extinguishing pipe in the outer wall recess, has heat dissipation cooling function, heats the function of rising the temperature, heat balance function. It is obviously different from this patent in the aspect of heat dissipation function.

CN 202695665U discloses a parallel high-capacity battery of public electrolyte, at least 6 monomer high-capacity battery cores are packaged in a same large plastic shell in a combined mode, all the monomer battery cores are separated by a partition plate with micropores, and the electrolyte is shared among the batteries.

Disclosure of Invention

In order to solve the technical problem, the technical scheme adopted by the application is as follows:

the application discloses a high-capacity battery, which comprises a shell and is characterized by comprising a battery pack and a heat exchange device, wherein the battery pack is arranged in the shell; the heat exchange device comprises a TEC semiconductor module arranged on the outer side of the upper cover plate of the shell and two identical heat dissipation assemblies arranged in the shell, and the condensation ends of the heat dissipation assemblies extend out of the upper cover plate of the shell to be connected with the TEC semiconductor module; the heat dissipation assembly comprises a conductive bar connected with the positive electrode or the negative electrode of the battery pack, a hollow pole column connected with the conductive bar and provided with an outer wall groove, and a heat conduction fire extinguishing pipe arranged in the outer wall groove.

Further, in the embodiment provided by the application, a soaking bar is embedded in the pole and connected with the semiconductor module; when the temperature of the battery is too high, the heat-equalizing row conducts the temperature of the pole to the semiconductor module, and the heat is dissipated through the semiconductor module. A heating plate is embedded in the pole; when the temperature of the battery is too low, the heating sheet starts to work to heat the pole.

Further, in the embodiments provided in the present application, a double-layer insulating pad is disposed between the semiconductor module and the housing upper cover plate. The double-layer insulating pad comprises an upper-layer insulating pad and a lower-layer insulating pad; and two grooves matched with the soaking rows are formed in the lower insulating pad.

Further, in the embodiments provided in the present application, the heat dissipation assembly and the upper cover plate of the housing are sealed by injection molding; the injection molding is upper and lower two-layer turn-ups structure.

Further, in the embodiments provided in the present application, a positioning sleeve for fixing and protecting two heat dissipation assemblies is included, and the positioning sleeve includes: an upper end positioning sleeve and a lower end positioning sleeve; the upper end positioning sleeve is sleeved under the injection molding part; the lower end positioning sleeve is connected with the pole through a bolt.

Further, in embodiments provided herein, the thermally conductive fire extinguishing tube is filled with a thermally conductive fire extinguishing material; when the temperature of the battery rises, the heat-conducting fire extinguishing material in the heat-conducting fire extinguishing pipe flows out from the closed end, and the explosion of the battery is restrained.

Further, in the embodiments provided in the present application, an insulation heightening pad is disposed on the inner side of the lower cover plate of the housing.

Further, in the embodiment provided by the application, the upper cover plate of the shell is provided with a liquid injection explosion venting port; and a pressure valve or a pressure relief film is arranged on the liquid injection and explosion relief port.

Further, in the embodiments provided in the present application, handles are respectively disposed on two opposite sides of the outer side of the housing.

The embodiment of the application also provides an assembly method of the high-capacity battery, which comprises the following steps:

s100: arranging the electrodes of the plurality of single square batteries in the same direction, and enabling the positive electrodes and the negative electrodes of the electrodes to be respectively arranged on the same side to form a battery pack;

s200: respectively connecting the positive electrode and the negative electrode of the battery pack with a conductive bar, then connecting the conductive bar with a hollow pole with an outer wall groove, and embedding a heat-conducting fire extinguishing pipe in the outer wall groove to form the battery pack with two groups of radiating assemblies;

s300: fixing and protecting the two groups of radiating assemblies through a positioning sleeve;

s400: embedding a heat equalizing bar in the hollow polar columns in the two heat dissipation assemblies, wherein the heat equalizing bar is connected with the TEC semiconductor module through a double-layer insulating pad;

s500: and arranging a heightened insulating pad at the bottom of the shell, then putting the battery pack formed in the step S400 into the shell, and sealing the battery pack through an upper cover plate and an injection molding part to form a high-capacity battery.

Further, in the embodiment provided in the present application, in step S400, a heating plate may be further embedded in the pole, and the pole is heated by the heating plate.

Further, in the embodiments provided herein, in step S500, handles are welded to two opposite sides of the housing.

Further, in the embodiment provided in the present application, in step S500, a pressure valve or a pressure relief film is disposed on the liquid injection and explosion venting port of the upper cover plate.

The utility model provides a large capacity lithium ion battery, electrically conductive row and utmost point post are parallelly connected with monomer battery through the L type, through the fixed of position sleeve, through embedding soaking piece, heating plate and the outside heat conduction fire extinguishing pipe of inlaying in lithium ion battery utmost point post inside, through the control of battery case external TEC semiconductor module, effectual control large capacity lithium ion battery's internal temperature has improved large capacity lithium ion battery's reliability, security and life.

The utility model provides a single cell utilizes current finished product square battery, through opening single cell casing top pressure release mouth and bottom or lateral wall opening through structure, realize the interior group battery sharing electrolyte of big battery case, the capacity of battery has been improved, because pour into electrolyte into and share for each single cell battery, consequently, whole group battery during operation, inside temperature is the same, ensure that battery temperature is unanimous, this application is again through being equipped with the inside temperature of heat dissipation with the effectual control of heating element large capacity lithium ion battery, the product has obvious advantage in the aspect of practical reliability.

Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a battery structure according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a parallel battery pack according to an embodiment of the present application (with L-shaped conductive bars and poles).

Fig. 3 is a schematic diagram of an internal structure of a battery according to an embodiment of the present application.

Fig. 4 is a schematic view of a TEC tape double-layer insulating pad according to an embodiment of the present application.

FIG. 5 is a schematic view of an underlying insulating pad according to an embodiment of the present application.

Fig. 6 is a schematic structural view of an upper end positioning sleeve according to an embodiment of the present application.

Fig. 7 is a schematic structural view of a lower end positioning sleeve according to an embodiment of the present application.

Fig. 8 is a schematic view of an L-shaped conductive bar structure according to an embodiment of the present application.

Fig. 9 is a schematic view of a pole structure according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a housing according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of an upper cover plate according to an embodiment of the present application.

Fig. 12 is a schematic structural view of a handle according to an embodiment of the present application.

FIG. 13 is a schematic view of an injection molded seal according to an embodiment of the present application.

Fig. 14 is a schematic structural diagram of a square lithium ion battery according to an embodiment of the present application.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings, whereby one skilled in the art can, with reference to the description, make an implementation.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It should be understood that directional terms such as "upper" and "lower" are used herein in accordance with the accompanying drawings to facilitate better understanding of the technical aspects of the present application.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 14, the present application discloses a large capacity battery, comprising a case, said case 1 comprising an upper cover plate 11 disposed above said case 1 and a lower base plate 12 disposed above said case 1, a battery pack 2 disposed inside said case 1, a heat exchange device disposed outside said case 1;

the heat exchange device comprises a TEC semiconductor module 5 arranged on the outer side of an upper cover plate 11 of the shell 1 and two identical heat dissipation assemblies arranged in the shell 1, wherein a condensation end of each heat dissipation assembly extends out of the upper cover plate 11 of the shell 1 and is connected with the TEC semiconductor module 5;

the heat dissipation assembly comprises an L-shaped conductive bar 3 connected with the anode or the cathode of the battery pack 2, a hollow pole column 4 connected with the conductive bar 3 and provided with an outer wall groove, and a heat conduction fire extinguishing pipe 43 arranged in the outer wall groove, wherein the heat conduction fire extinguishing material in the heat conduction fire extinguishing pipe 43 timely conducts internal heat of the battery to the top end of the battery during normal work to dissipate heat.

Further, the housing 1 includes an upper cover plate 11 disposed above the housing 1 and a lower base plate 12 disposed above the housing 1.

Further, as shown in fig. 2, 8, 9 and 14, the battery pack 2 includes at least two lithium iron phosphate square batteries 21 closely arranged side by side. When the lithium iron phosphate square batteries are arranged, the electrodes are arranged in the same direction, and the positive electrode and the negative electrode are arranged on the same side.

Furthermore, the battery pack is formed by connecting single square batteries with upper and lower openings in parallel, and the single batteries are communicated up and down; all the single batteries in the battery pack share the electrolyte. The battery core of the single battery is intact without damage, and the internal resistance and the voltage are consistent.

One side of the conductive bar 3 is provided with a plurality of holes;

welding one side of the L-shaped conductive bar 3 without the hole with the anode of the battery by using a laser welding machine; welding the other L-shaped conductive bar 3 without the hole with the cathode of the battery by using a laser welding machine;

the L-shaped conductive bar 3 is connected with the pole 4 by welding or bolts; the pole 4 is screwed and matched with one side of the conductive bar 3 with the hole through a bolt to form a parallel battery pack.

That is, when manufacturing the battery pack, the square battery units are clamped in parallel in sequence, then the L-shaped conducting bars are welded on the positive electrode and the negative electrode of the battery, and then the poles are assembled to form the parallel battery pack; it should be noted that when the battery pack is assembled, the batteries are arranged in the same direction, the positive electrode and the negative electrode cannot be welded on the L-shaped conductive bar, the side with the holes is arranged along the edge of the batteries, the L-shaped conductive bar cannot be connected with the pole posts, the overcurrent area of the parallel battery pack is effectively increased, and the problem that the batteries generate heat due to the fact that the overcurrent area is insufficient is effectively solved.

Optionally, the L-shaped conducting bar 3 and the pole 4 are made of aluminum alloy or pure copper.

In the embodiment provided by the present application, as shown in fig. 1 and 3, a soaking bar 41 is embedded in the pole 4, and the soaking bar 41 is connected with the TEC semiconductor module 5; when the temperature of the battery is too high, the heat equalizing row 41 conducts the temperature of the pole 4 to the TEC semiconductor module 5, and heat is dissipated through the TEC semiconductor module 5. A heating plate 42 is embedded in the pole 4; when the battery temperature is too low, the heating plate 42 starts to work, and the pole 4 is heated.

That is, the internal temperature of the battery can be effectively controlled no matter the large-capacity battery is in a high-temperature environment or a low-temperature environment, and the battery is ensured to be always in an optimal working state.

Further, the heat equalizing row is L-shaped; the vertical section of the uniform heat bar is embedded in the pole, and the horizontal section of the uniform heat bar is connected with the TEC semiconductor module; when the temperature of the battery is too high, the heat-equalizing row conducts the temperature of the pole to the TEC semiconductor module, and heat is dissipated through the TEC semiconductor module. And a gap between the heat equalizing bar and the pole is filled with a heat conduction material so as to play a role in heat transfer. The heat conduction material is liquid heat conduction glue or double-component sealing heat conduction glue. The pole is made of aluminum alloy and red copper. When the batteries are vertically placed, the heat equalizing bar is a gravity heat bar.

Furthermore, a heating plate is embedded in the pole; when the temperature of the battery is too low, the heating sheet starts to work to heat the pole. The material in the heating sheet can be silicon rubber, polyimide and polyacetamide.

In the embodiment provided by the present application, as shown in fig. 4 and 5, a double-layer insulating pad is disposed between the TEC semiconductor module 5 and the upper cover plate 11 of the housing 1.

The double-layer insulating pad includes:

an upper insulating pad 51; the upper layer of insulating pad 51 is made of insulating heat conducting material and can resist high temperature of 260 ℃ to normally work.

A lower insulating pad 52; the lower insulating pad 52 is made of rubber, PP (polypropylene) or epoxy resin and can resist the temperature of more than 130 ℃.

Be equipped with on the insulating pad 52 of lower floor and arrange two recesses that match with the soaking, will stretch out from upper cover plate 11 and inlay in the inside soaking of utmost point post is arranged 41 and is extended to this recess in, screw up upper/lower insulating layer with the screw, closely cooperate, fix on casing upper cover plate 11, can control the inside parallelly connected group battery temperature of casing, ensure that the battery is high-efficient to operate.

The lower-layer insulating pad is formed by an injection molding process and is integrated with the upper cover plate and the pole of the shell during injection molding. The upper layer insulating pad is made of heat-conducting silica gel sheets, heat-conducting PPS and heat-conducting nylon 66, and can resist high temperature of 260 ℃ to normally work. The lower insulating pad is made of rubber or PP (polypropylene) or epoxy resin and can resist high temperature of over 130 ℃.

In the embodiments provided by the present application, as shown in fig. 3 and 13, the heat dissipation assembly and the upper cover plate of the housing are sealed by injection molding; the injection molding is two-layer turn-ups structure about, presss from both sides upper cover plate 11 between two-layer turn-ups, perfect sealing shell upper cover plate 11 gap. The injection molding piece is provided with a spacer structure between the positive pole and the negative pole, so that the insulation between the positive pole and the negative pole is ensured.

Furthermore, the injection molding part 6 is a high-temperature resistant material, normally works at a temperature of more than 130 ℃, and the material can be selected from hydrogenated nitrile rubber, ethylene propylene diene monomer, fluororubber, silicon rubber, pp and other materials.

In the embodiment provided by the present application, as shown in fig. 3, 7 and 8, a positioning sleeve 7 for fixing and protecting two heat dissipation assemblies is included, where the positioning sleeve 7 includes: an upper end positioning sleeve 71 and a lower end positioning sleeve 72; the upper end positioning sleeve 71 is sleeved under the injection molding part 6; the lower end positioning sleeve 72 is connected with the pole 4 through a bolt.

The positioning sleeve is made of an insulating plastic part and is required to resist high temperature of more than 130 ℃. The insulating plastic part is made of one or a combination of more than two of PVC, PP, PS, POM, PMMA, PBT, PC and ABS.

In the embodiments provided by the present application, the heat-conducting fire extinguishing pipe is filled with a heat-conducting fire extinguishing material; when the temperature of the battery rises, the heat-conducting fire extinguishing material in the heat-conducting fire extinguishing pipe flows out from the closed end, and the explosion of the battery is restrained.

The heat-conducting fire extinguishing material is halogenated alkane. The halogenated alkane is one or more of perfluorohexanone, perfluoropentanone, difluoro monochloro bromomethane, tetrachloromethane and trifluoro monobromomethane.

In the embodiment provided by the application, a temperature acquisition sensor is arranged in the battery pack and connected with the TEC semiconductor module.

In the embodiment that this application provided, the inboard of apron is equipped with the insulation and increases the pad under the casing, ensures that group battery utmost point post and casing outage, and this insulation increases and fills up the material and can be PP material or epoxy material.

In the embodiment provided by the application, the TEC semiconductor module may be replaced with a combination of a heat sink and a fan to dissipate heat dissipated by soaking.

In the embodiment provided by the present application, as shown in fig. 11, only one liquid injection and explosion venting port is provided on the upper cover plate of the housing; and a pressure valve or a pressure relief film is arranged on the liquid injection and explosion relief port. Or the liquid injection explosion venting port is provided with a three-way valve 14 or a four-way valve 14 with the functions of vacuumizing, liquid injection and explosion venting.

And an insulating plate is additionally arranged between the pole and the shell, so that the insulating property inside the large-capacity battery is ensured. The insulating plate is made of a plastic piece. The plastic part is made of one or more of PVC, PP, PS, POM, PMMA, PBT, PC, ABS, epoxy resin plate and rubber sheet.

In the embodiments provided by the present application, the housing is a square metal cylinder with heat dissipation fins, and the material of the housing is an aluminum alloy.

In the embodiment provided by the present application, as shown in fig. 1 and 12, handles 13 are respectively disposed on two opposite sides of the outer side of the housing 1. The handle is made of aluminum.

As shown in fig. 1 to 14, in the embodiments provided herein, the assembly process of the present application is roughly as follows:

s100: arranging the electrodes of 11 280Ah monomer lithium iron phosphate square batteries in the same direction, and enabling the positive electrodes and the negative electrodes of the electrodes to be respectively arranged on the same side to form a battery pack;

s500: and arranging a heightened insulating pad at the bottom of the shell, then putting the battery pack formed in the step S400 into the shell, and sealing the battery pack through an upper cover plate and an injection molding piece to form a 3.2V 3000Ah large-capacity battery.

Although the embodiments of the present application have been disclosed above, they are not limited to the applications listed in the description and the embodiments. It can be applied in all kinds of fields suitable for the present application. Additional modifications will readily occur to those skilled in the art. Therefore, the application is not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A high-capacity battery comprises a shell, and is characterized in that a battery pack is arranged in the shell, and a heat exchange device is arranged outside the shell;

the heat exchange device comprises a semiconductor module arranged on the outer side of the upper cover plate of the shell and two identical heat dissipation assemblies arranged in the shell, and the condensation ends of the heat dissipation assemblies extend out of the upper cover plate of the shell to be connected with the semiconductor module;

the heat dissipation assembly comprises a conductive bar connected with the positive electrode or the negative electrode of the battery pack, a hollow pole column connected with the conductive bar and provided with an outer wall groove, and a heat conduction fire extinguishing pipe arranged in the outer wall groove.

2. A large capacity battery as defined in claim 1, wherein said conductor bar is an L-shaped conductor bar.

3. A large capacity battery as defined in claim 1, wherein a soaking bar is embedded in said post, said soaking bar being connected to said semiconductor module;

when the temperature of the battery is too high, the heat-equalizing row conducts the temperature of the pole to the semiconductor module, and the heat is dissipated through the semiconductor module.

4. A large capacity battery according to claim 3, wherein said heat equalizing row is L-shaped;

the vertical section of the soaking row is embedded in the pole, and the soaking row horizontal section is connected with the semiconductor module;

when the temperature of the battery is too high, the soaking row conducts the temperature of the pole to the semiconductor module, and heat is dissipated through the semiconductor module.

5. A large capacity battery as defined in claim 4, wherein said soaking bank is a gravity draining bank when the battery is placed vertically.

6. A large capacity battery as defined in claim 4, wherein a heating sheet is further embedded in said terminal;

when the temperature of the battery is too low, the heating sheet starts to work to heat the pole.

7. A large capacity battery as claimed in claim 3 or 4, wherein the gaps between the heat spreader and the terminals are filled with heat conductive material to conduct heat.

8. A large capacity battery in accordance with claim 7, wherein said heat conductive material is a liquid heat conductive paste or a two-component sealing heat conductive paste.

9. A large capacity battery as defined in claim 1, wherein said battery pack is a plurality of unit prismatic batteries having upper and lower openings, the unit prismatic batteries being connected in parallel, the unit prismatic batteries being vertically through;

all the single batteries in the battery pack share the electrolyte.

10. A large capacity battery as defined in claim 9, wherein said cells of said unit cells are intact without breakage, and have an internal resistance corresponding to the voltage.

11. A large capacity battery as defined in claim 1, wherein a double layer insulating mat is provided between said semiconductor module and said case upper lid.

12. A large capacity battery in accordance with claim 11, wherein said double-layered insulating mat comprises an upper-layered insulating mat and a lower-layered insulating mat;

and two grooves matched with the soaking bars are formed in the lower insulating pad.

13. A large capacity battery as defined in claim 12, wherein said lower insulating mat is formed by injection molding process and is integrally injection molded with said upper cover plate and said terminal post of said case.

14. A large capacity battery as defined in claim 1, wherein said heat dissipating module is sealed with said upper cover plate of said case by injection molding.

15. A large capacity battery according to claim 14, wherein said injection-molded member has upper and lower flanges which are formed to be wrapped around the upper and lower sides of the upper cover plate of said case for sealing and insulating.

16. A large capacity battery as claimed in claim 15, wherein the injection-molded member has a separator structure between the positive and negative poles to ensure insulation between the positive and negative poles.

17. A large capacity battery as recited in claim 16, comprising a positioning sleeve for fixing and protecting the two heat dissipating members, said positioning sleeve comprising: an upper end positioning sleeve and a lower end positioning sleeve;

the upper end positioning sleeve is sleeved under the injection molding part;

the lower end positioning sleeve is connected with the pole through a bolt.

18. A large capacity battery as defined in claim 17, wherein said positioning sheath is made of an insulating plastic material and is required to withstand a high temperature of 130 ℃.

19. A large capacity battery in accordance with claim 1, wherein said heat conductive fire extinguishing pipe is filled with a heat conductive fire extinguishing material;

when the temperature of the battery rises, the heat-conducting fire extinguishing material in the heat-conducting fire extinguishing pipe flows out from the closed end, and the explosion of the battery is restrained.

20. A high capacity battery as claimed in claim 19, wherein the thermally conductive fire extinguishing material is a halogenated alkane.

21. A large capacity battery as defined in claim 1, wherein a temperature pickup sensor is provided in said battery pack, said temperature pickup sensor being connected to said semiconductor module.

22. A large capacity battery as defined in claim 1, wherein an insulation heightening pad is provided on an inner side of the lower cover plate of the case.

23. A large capacity battery in accordance with claim 6, wherein said semiconductor module is replaced with a combination of a heat sink and a fan for dissipating heat from the heat uniformly radiated.

24. A large capacity battery as defined in claim 1, wherein said case upper cover plate is provided with a liquid injection explosion venting port.

25. A large capacity battery as defined in claim 24, wherein said liquid injection and explosion venting port is provided with a pressure valve or a pressure relief membrane.

26. A large capacity battery as defined in claim 24, wherein said liquid injection and explosion venting port is provided with a three-way valve or a four-way valve having vacuum pumping, liquid injection and explosion venting functions.

27. A large capacity battery as claimed in claim 25, wherein an insulating plate is additionally provided between the terminal and the case to ensure the insulating property inside the large capacity battery.

28. A large capacity battery as defined in claim 27, wherein said insulating plate is made of a plastic material.

29. A large capacity battery in accordance with claim 1, wherein said case is a square metal can with heat radiating fins.

30. A large capacity battery as defined in claim 1, wherein said case is made of an aluminum alloy.

31. A large capacity battery as defined in claim 1, wherein handles are provided on opposite sides of the outer side of said case, respectively.

32. A large capacity battery as defined in claim 31, wherein said handle is made of aluminum.