A large-capacity battery structure and a large-capacity battery assembly method

Abstract

The present invention discloses a large-capacity battery structure and an assembly method of a large-capacity battery, which belongs to the field of batteries and includes a shell, a cover, a battery pack, a conductive bar and a temperature management unit. The battery pack is located in the shell, and the cover is a pole, including a positive pole cover and a negative pole cover. The positive pole cover and the negative pole cover are respectively located on two sides of the shell, the positive pole cover is a positive pole column, the negative pole cover is a negative pole column, and the two ends of the conductive bar are respectively connected to the pole ears and the cover of the battery pack. The assembly method of the large-capacity battery arranges the electrodes of a plurality of single cells in the same direction to form a battery pack; the positive and negative pole ears of the battery pack are respectively connected to the conductive bar, and the conductive bar is connected to the cover and fixed to the cover. The covers on both sides of the shell serve as poles, which saves materials and reduces costs, while saving space inside the battery, greatly improving the energy density of the battery, and also facilitating heat dissipation of the poles.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a large-capacity battery structure and an assembling method of a large-capacity battery. Background Art

[0002] As of the end of 2020, among all types of electrochemical energy storage technologies, lithium-ion batteries have the largest cumulative installed capacity, at approximately 2.9GW.

[0003] my country's research and development of large-capacity energy storage batteries is mainly limited by factors such as production equipment, safety technology, high scrap rate, and mass production costs. The cost of energy storage is the key to the development of energy storage systems. In existing lithium battery applications, the use of ultra-large capacity batteries is often involved. The mainstream large-capacity single square lithium battery on the market is 300Ah, and the largest capacity single cylindrical battery is no more than 100Ah. Affected by the capacity of single cells, lithium batteries need to be connected in parallel to achieve the required capacity requirements when used in energy storage applications. For ultra-large capacity energy storage battery systems, in order to achieve their ultra-large capacity requirements, a large number of single cells need to be connected in parallel to form battery modules, and then connected in series with other battery modules to increase the voltage of the overall battery system to connect multiple single cells in series and parallel. When making large-capacity lithium batteries, multiple groups of battery cells need to be connected in parallel. If the connection and alignment of the multiple groups of battery cells are improper during the parallel connection process, it is easy for the performance parameters such as the capacity, resistance, and voltage of the battery cells to be uneven. Or if one of the battery cells has quality problems, it will affect the performance of the entire large-capacity battery, resulting in poor consistency after the battery cells are connected in parallel, making the performance of the large-capacity battery unstable and the scrap rate high. At the same time, most of the existing large-capacity lithium batteries are filled and use electrolytes independently, resulting in poor overall working performance of the large-capacity lithium batteries.

[0004] Most of the existing large-capacity lithium-ion batteries are formed by connecting multiple small-capacity batteries in parallel to form a large-capacity lithium-ion battery. When in use, the large-capacity lithium-ion battery needs to be connected in series to meet the power demand, which results in a wide variety of connecting parts, complicated and cumbersome connection steps, time-consuming and labor-intensive, and huge consumption of battery management systems, wires, and battery boxes, resulting in high energy storage costs. In addition, this connection method has complicated connecting wires and different internal resistances, resulting in current differences, which can easily cause battery heating. After long-term use, the consistency of the battery will become worse and worse, which not only poses a safety hazard, but also seriously affects the battery life.

[0005] CN101931098A discloses a square battery, including a shell, a safety valve is provided on the top of the shell, a pole piece and a pole ear are provided in the shell, the positive and negative poles of the pole piece are connected to the positive end and the negative end of the pole ear respectively, the other end of the positive end of the pole ear and the other end of the negative end of the pole ear are connected to the positive pole column and the negative pole column respectively, the positive pole column and the negative pole column are arranged as horizontal pole columns, and the positive pole column and the negative pole column are horizontally connected to the positive end and the negative end of the pole ear respectively. However, the pole column of the patent does not extend directly out of the shell, the heat dissipation effect is not good, and multiple batteries cannot be connected in series.

[0006] CN107658489A discloses a fuel cell module that is easy to install and disassemble, including a fluid distributor, front and rear baffles, a fuel cell soft pack, a battery soft pack connecting strip and a strapping tape; the fuel cell soft pack includes a type I fuel cell soft pack and a type II fuel cell soft pack; after being integrated with the front baffle and the rear baffle, they are fixed with a strapping tape; and n fuel cell soft packs are sequentially stacked in series according to the interval between the type I fuel cell soft pack and the type II fuel cell soft pack, and then a fluid distributor is installed in front of the front baffle; and they are bundled together with a strapping tape to form a fuel cell module. However, this patent only has electrodes extending out of the shell, which cannot achieve a good heat dissipation effect, and cannot save space in the battery, and has a low energy density; although the series connection is achieved, its series structure is not stable enough and is not conducive to heat dissipation.

[0007] CN 211957777 U provides a large-capacity battery, which is made of 30 lithium iron phosphate positive electrode-graphite negative electrode winding core bodies into a 3.2V, 450Ah winding core group, and then a liquid absorption plate and a liquid absorption rod are added to form a winding core cluster, and then 4 winding core clusters are connected in parallel to form a winding core stack, thereby manufacturing a 3.2V1800Ah ultra-large capacity battery. The invention directly connects multiple 40Ah single cells in parallel, and has the characteristics of simple installation process, few connectors, controllable battery pack temperature, reliable quality, low cost, etc.

[0008] CN 104883861A discloses a large-capacity battery with a heat dissipation device, which is to insert multiple heat sinks with clips into the gaps between several cylindrical batteries in parallel, and the heat sinks are in close contact with the cylindrical battery cells, so as to improve the heat dissipation efficiency of the battery and ensure the consistency of the internal temperature of the battery. The large-capacity battery heat dissipation structure of the present invention is simple, the number of single cells is small, the failure rate is low, and the yield rate is high. The internal temperature of the battery is controlled by the semiconductor module semiconductor refrigeration and heat dissipation module tube outside the battery pack, and the pole design with a cavity and an outer wall through hole is provided. A heat equalizing row and a heating plate are arranged in the cavity, and a heat-conducting fire extinguishing pipe is embedded in the outer wall through hole, which has the functions of heat dissipation and cooling, heating and heating, and heat balancing. It has a significant gap with this patent in terms of heat dissipation function.

[0009] CN 202695665U discloses a parallel large-capacity battery with a common electrolyte. At least six single large-capacity battery cells are packaged in a same large plastic shell. The single battery cells are separated by a partition containing micropores, and the electrolyte is shared between the batteries. Summary of the invention

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0011] The present invention discloses a large-capacity battery structure, comprising a shell, a cover, a battery pack, a conductive bar and a temperature management unit, wherein the battery pack is located in the shell, the cover is a pole, comprising a positive pole cover and a negative pole cover, the positive pole cover and the negative pole cover are respectively located on two sides of the shell, the positive pole cover is a positive pole column, the negative pole cover is a negative pole column, and the two ends of the conductive bar are respectively connected to the pole ears of the battery pack and the cover.

[0012] It is further defined that the battery pack is composed of at least one battery cell, and the positive and negative tabs of the battery pack are located on the same side of the battery pack and are connected to the conductive bar.

[0013] It is further defined that the conductive bar is a Z-shaped conductive bar, and a plurality of through slots are provided on one long side of the Z-shaped conductive bar, and the positive and negative tabs of the battery pack pass through the through slots and are vertically bent and then welded to the upper end surface of the Z-shaped conductive bar.

[0014] It is further defined that a welding groove is provided on the pole, and the welding groove corresponds to the shape of the conductive bar.

[0015] It is further defined that the conductive bar includes a positive conductive bar and a negative conductive bar, the positive cover is welded to the positive conductive bar, and the negative cover is welded to the negative conductive bar.

[0016] It is further defined that an insulating sealing ring is provided between the cover body and the shell.

[0017] It is further defined that the cover body and the shell are connected by bolts, and the connection and the surface of the bolts are coated with an insulating layer.

[0018] It is further defined that metal plates are welded around the shell, a cavity loop is formed between the metal plate and the shell, and the cavity is filled with coolant.

[0019] It is further defined that the metal plate welding points are on the edges and reinforcing ribs around the shell, and the welding method is full welding.

[0020] It is further defined that a water inlet and a water outlet are provided on the side of the metal plate, and the water inlet and the water outlet are connected to a coolant circulation device through a pipeline.

[0021] It is further defined that the material of the conductive bar is aluminum alloy or pure copper.

[0022] It is further defined that the cover is made of aluminum alloy or copper.

[0023] It is further defined that the cover body is a hollow structure, the temperature management unit includes a semiconductor module arranged on the outside of the shell and a heat dissipation component arranged in the cover body, and one end of the heat dissipation component extends out of the pole and is connected to the semiconductor module.

[0024] It is further defined that a double-layer insulation pad is provided between the semiconductor module and the housing.

[0025] It is further defined that the double-layer insulation pad comprises an upper insulation pad and a lower insulation pad, and the lower insulation pad is provided with four through holes matching the heat pipe.

[0026] It is further defined that the material of the upper insulating pad is one of thermally conductive silicone sheet, thermally conductive PPS, and thermally conductive nylon 66, and can withstand temperatures above 260°C.

[0027] It is further defined that the material of the lower insulating pad is one of rubber, PP, and epoxy resin, and can withstand temperatures above 130°C.

[0028] It is further defined that a liquid injection and explosion relief port is provided on the side of the shell.

[0029] It is further defined that a pressure valve or a pressure relief membrane is provided on the liquid injection explosion relief port.

[0030] It is further defined that a three-way valve or a four-way valve with vacuuming, liquid injection and explosion relief functions is provided on the liquid injection and explosion relief port.

[0031] It is further defined that the shell is provided with reinforcing ribs.

[0032] It is further defined that the shell is a square metal structure, and the material is aluminum alloy.

[0033] The present invention also discloses a method for assembling a large-capacity battery formed by the large-capacity battery structure described in any one of the above, comprising the following steps:

[0034] S100: Arranging electrodes of a plurality of single cells in the same direction so that the positive electrodes and negative electrodes of the cells are on the same side, fixing them with an extrusion plate and bundling them with a steel belt to form a battery pack;

[0035] S200: Connecting the positive electrode tab and the negative electrode tab of the battery pack to the conductive bar respectively, and then connecting the conductive bar of any one electrode to the cover body, and fixing the battery module to the cover body with bolts through the connection holes of the extrusion plate;

[0036] S300: Place one end face of the cover downward, put it on the shell and fix it;

[0037] S400: placing and fixing another electrode cover;

[0038] S500: embedding heat pipes in the through holes of the cover to form two groups of heat dissipation components;

[0039] S600: Connect the two heat dissipation components to the semiconductor module via a double-layer insulation pad.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The present invention discloses a large-capacity battery structure, including a shell, a cover, a battery pack, a conductive bar and a temperature management unit. The battery pack is located in the shell, and the cover is a pole, including a positive pole cover and a negative pole cover. The positive pole cover and the negative pole cover are respectively located on two sides of the shell, the positive pole cover is a positive pole column, and the negative pole cover is a negative pole column. The two ends of the conductive bar are respectively connected to the pole ears of the battery pack and the cover. The covers on both sides of the shell serve as poles, which saves materials and greatly reduces the manufacturing cost of the battery. At the same time, it saves space inside the battery and greatly improves the energy density of the battery. And using the cover as a pole is conducive to the timely and effective dissipation of the heat of the pole, which improves the reliability, safety and service life of the battery.

[0042] 2. By welding the two ends of the conductive bar to the pole and the tab of the battery pack respectively, the contact area between the conductive bar, pole and tab is increased, the current carrying capacity is improved, the stability of the connection is enhanced, virtual connection is effectively prevented, and the safety performance of the battery is greatly enhanced.

[0043] 3. There are welding grooves on the poles, which correspond to the shape of the conductive bars, making the welding tighter and improving the stability of the structure.

[0044] 4. The positive electrode cover and the negative electrode cover have the same structure and can be manufactured using one template, which is simple in process.

[0045] 5. An insulating sealing ring is provided between the cover and the shell, and the two are connected by bolts. The connection and the surface of the bolts are coated with an insulating layer to ensure the insulation seal between the cover and the shell, greatly improving the safety performance of the battery.

[0046] 6. Metal plates are welded around the shell, and a cavity loop is formed between the metal plate and the shell. The cavity is filled with coolant. A water inlet and a water outlet are provided on the side of the metal plate. The water inlet and the water outlet are connected to the coolant circulation device through pipes to form a liquid cooling circulation device, which can dissipate the heat generated by the battery in a timely and effective manner, and also has a certain explosion-proof function, which can prevent the battery from thermal runaway and ensure the safety of the battery.

[0047] 7. The material of the conductive bar is aluminum alloy or pure copper, and the material of the body is aluminum alloy or copper, which can save costs while ensuring battery performance.

[0048] 8. The cover is a hollow structure. The temperature management unit includes a semiconductor module arranged outside the shell and a heat dissipation component arranged inside the cover. One end of the heat dissipation component extends out of the pole and is connected to the semiconductor module. The pole is a hollow structure. The heat dissipation component is arranged inside the pole, which saves space and improves the heat dissipation effect of the pole. One end of the heat dissipation component extends out of the pole and is connected to the semiconductor module, which can keep the battery temperature balanced.

[0049] 9. A double-layer insulation pad is provided between the semiconductor module and the housing. The material of the upper insulation pad is one of thermally conductive silicone sheet, thermally conductive PPS, and thermally conductive nylon 66, with a temperature tolerance of more than 260°C; the material of the lower insulation pad is one of rubber, PP, and epoxy resin, with a temperature tolerance of more than 130°C. The insulation effect is good, which greatly improves the safety performance of the battery.

[0050] 10. A liquid injection and explosion relief port is provided on the side of the shell, and a three-way valve or a four-way valve with vacuuming, liquid injection and explosion relief functions is provided on the liquid injection and explosion relief port. Multiple functions can be achieved through the same structure, which is simple in structure and easy to process and manufacture.

[0051] 11. The shell is a square metal structure made of aluminum alloy. Reinforcement ribs are provided on the shell, which has a stable structure, is not easy to deform, and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 Schematic diagram of the overall structure of a battery according to an embodiment of the present invention.

[0054] Figure 2 Schematic diagram of the battery pack structure of an embodiment of the present invention.

[0055] Figure 3 FIG. 4 is a schematic diagram of a semiconductor module according to an embodiment of the present invention.

[0056] Figure 4 Schematic diagram of the lower insulating pad according to an embodiment of the present invention.

[0057] Figure 5 Schematic diagram of the conductive bar structure according to an embodiment of the present invention.

[0058] Figure 6 Schematic diagram of the positive electrode cover structure of an embodiment of the present invention.

[0059] Figure 7 Schematic diagram of the negative electrode cover structure according to an embodiment of the present invention.

[0060] Figure 8 Schematic diagram of the extruded plate structure according to an embodiment of the present invention.

[0061] Fig. 9 Schematic diagram of the sealing ring structure of an embodiment of the present invention.

[0062] Fig.10 Schematic diagram of the shell structure of an embodiment of the present invention.

[0063] Fig.11 Schematic diagram of the metal plate structure according to an embodiment of the present invention.

[0064] Among them, 1-positive electrode cover, 11-connection hole, 12-welding groove, 13-through hole, 2-negative electrode cover, 21-connection hole, 22-through hole, 23-connection hole, 3-shell, 31-connection hole, 32-reinforcement rib, 33-connection hole, 4-semiconductor module, 5-heat pipe, 6-battery pack, 61-battery cell, 62-conductive bar, 63-connector, 64-extruded plate, 65-steel strip, 7-lower insulating pad, 8-sealing ring, 9-metal plate. DETAILED DESCRIPTION

[0065] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0066] It should be understood that terms such as “having”, “including” and “comprising” used herein do not specify the existence or addition of one or more other elements or combinations thereof.

[0067] It should be understood that directional terms such as "upper" and "lower" used in this document are explained based on the drawings in the specification to facilitate a better understanding of the technical solutions of the present invention.

[0068] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0069] The present invention discloses a large-capacity battery structure, including a shell 3, a cover 1 / 2, a battery pack 6, a conductive bar 62 and a temperature management unit. The battery pack 6 is located in the shell 3, and the cover 1 / 2 is a pole, including a positive pole cover 1 and a negative pole cover 2. The positive pole cover 1 and the negative pole cover 2 are respectively located on two sides of the shell 3. The positive pole cover 1 is a positive pole pole, and the negative pole cover 2 is a negative pole pole. The two ends of the conductive bar 62 are respectively connected to the pole ears of the battery pack 6 and the cover. The battery pack 6 is composed of at least one battery cell. The positive and negative pole ears of the battery pack 6 are located on the same side of the battery pack 6 and connected to the conductive bar 62. The conductive bar 62 is a Z-shaped conductive bar 62. A plurality of through grooves are provided on one long side of the Z-shaped conductive bar 62. The positive and negative pole ears of the battery pack 6 pass through the through grooves and are vertically bent and then welded to the upper end surface of the Z-shaped conductive bar 62. There are welding grooves 12 on the poles, and the welding grooves 12 correspond to the shape of the conductive bar 62. The conductive bar 62 includes a positive conductive bar and a negative conductive bar. The positive cover 1 is welded to the positive conductive bar, and the negative cover 2 is welded to the negative conductive bar. An insulating sealing ring 8 is provided between the cover 1 / 2 and the shell 3. The cover 1 / 2 is connected to the shell 3 by bolts, and the connection and the surface of the bolts are coated with an insulating layer. A metal plate 9 is welded around the shell 3, and a cavity loop is formed between the metal plate 9 and the shell 3, and the cavity is filled with coolant. The welding points of the metal plate 9 are on the edges and reinforcing ribs 32 around the shell 3, and the welding method is full welding. A water inlet and a water outlet are provided on the side of the metal plate 9, and the water inlet and the water outlet are connected to the coolant circulation device through a pipeline. The material of the conductive bar 62 is aluminum alloy or pure copper. The material of the cover 1 / 2 is aluminum alloy or copper. The cover is a hollow structure, and the temperature management unit includes a semiconductor module arranged on the outside of the shell 3 and a heat dissipation component arranged in the cover, and one end of the heat dissipation component extends out of the pole and is connected to the semiconductor module. A double-layer insulation pad 7 is provided between the semiconductor module 4 and the shell 3. The double-layer insulation pad 7 includes an upper insulation pad and a lower insulation pad, and the lower insulation pad is provided with four through holes matching the heat pipe 5. The material of the upper insulation pad is one of thermally conductive silicone sheet, thermally conductive PPS, and thermally conductive nylon 66, and can withstand temperatures above 260°C. The material of the lower insulation pad is one of rubber, PP, and epoxy resin, and can withstand temperatures above 130°C. A liquid injection and explosion relief port is provided on the side of the shell 3. A pressure valve or a pressure relief membrane is provided on the liquid injection and explosion relief port. A three-way valve or a four-way valve with vacuuming, liquid injection, and explosion relief functions is provided on the liquid injection and explosion relief port. A reinforcing rib 32 is provided on the shell 3. The shell 3 is a square metal structure made of aluminum alloy.The present invention also discloses an assembly method of a large-capacity battery formed by a large-capacity battery structure according to any one of the above-mentioned items, comprising the following steps: S100: arranging the electrodes of a plurality of single cells in the same direction so that the positive and negative electrodes of the cells are on the same side, fixing them with an extrusion plate and bundling them with a steel belt to form a battery pack; S200: connecting the positive and negative pole ears of the battery pack to the conductive bars respectively, and then connecting the conductive bar of any one pole to the cover body, and fixing the battery module to the cover body with bolts through the connection holes of the extrusion plate; S300: facing one end face of the cover body downward, putting on the shell and fixing it; S400: placing and fixing the other cover body; S500: embedding heat pipes in the through holes of the cover body to form two groups of heat dissipation components; S600: connecting the two heat dissipation components to the semiconductor module through a double-layer insulating pad.

[0070] Example 1

[0071] See also Figure 1 This embodiment shows a large-capacity battery structure, which includes a housing 3, a cover 1 / 2, a battery pack 6, a conductive bar 62 and a temperature management unit. The battery pack 6 is located in the housing 3. The cover 1 / 2 is a pole, including a positive pole cover 1 and a negative pole cover 2. The positive pole cover 1 and the negative pole cover 2 are located on two sides of the housing 3, respectively. The positive pole cover 1 is a positive pole column, and the negative pole cover 2 is a negative pole column. One end of the conductive bar 62 is welded to the pole ear of the battery pack 6, and the other end is welded to the cover 1 / 2. The conductive bar 62, the housing 3 and the cover 1 / 2 are all made of aluminum alloy.

[0072] Preferably, the material of the conductive bar 62 may be aluminum alloy or pure copper.

[0073] Preferably, the material of the cover body 1 / 2 may be aluminum alloy or copper.

[0074] Preferably, the shell 3 is provided with reinforcing ribs 32 along the horizontal and vertical directions.

[0075] Preferably, the housing 3 is a square metal structure made of aluminum alloy.

[0076] It should be noted that in this embodiment, the cover 1 / 2 on both sides of the shell 3 is used as a pole, which saves materials and greatly reduces the production cost of the battery, while saving space inside the battery and greatly improving the energy density of the battery; and using the cover as a pole is conducive to the timely and effective dissipation of the heat of the pole, thereby improving the reliability, safety and service life of the battery.

[0077] It should be noted that the positive electrode cover 1 and the negative electrode cover 2 have the same structure and can be manufactured using one template, which simplifies the process.

[0078] Example 2

[0079] See also Figure 2 This embodiment shows a large-capacity battery structure. Based on the embodiment 1, the battery pack 6 is composed of two battery cells 61. The positive and negative tabs of the battery pack 6 are located on the same side of the battery pack 6 and are welded to one end of the conductive bar 62. The battery packs 6 are connected by a connector 63.

[0080] It should be noted that the number of cells 61 constituting the battery pack 6 in this embodiment can be 1, 2, 3 or more, and the specific number can be set according to the battery capacity requirements. The cells 61 constituting the battery pack 6 are structurally intact, not damaged, and have consistent internal resistance and voltage.

[0081] Example 3

[0082] See also Figure 2 , Figure 5 , Figure 6 , Figure 7 This embodiment shows a large-capacity battery structure. Based on the second embodiment, the conductive bar 62 is a Z-shaped conductive bar. A plurality of through slots are provided on one long side of the Z-shaped conductive bar. The positive and negative tabs of the battery pack 6 pass through the through slots and are vertically bent and then welded to the upper end surface of the Z-shaped conductive bar. The conductive bar 62 includes a positive conductive bar and a negative conductive bar. The positive cover 1 is welded to the positive conductive bar, and the negative cover 2 is welded to the negative conductive bar.

[0083] Preferably, a welding groove 12 is formed on the pole, and the welding groove 12 corresponds to the shape of the conductive bar 62 .

[0084] It should be noted that a plurality of connection grooves are provided on one side of the conductive bar 62, and a laser welding machine is used to connect and weld one end of the conductive bar 62 relative to the connection groove to the pole welding groove 12; a laser welding machine is used to weld one end of the connection groove to one pole of the battery; that is, when making the battery pack 6, the square battery cells are first clamped side by side in sequence, and then the L-shaped conductive bar 62 is welded on the positive and negative poles of the battery to form a parallel battery pack 6; when assembling the battery pack 6, the batteries are arranged in the same direction, and the positive and negative poles cannot be welded to one conductive bar 62.

[0085] It should be noted that, in this embodiment, by welding the two ends of the conductive bar 62 to the pole and the pole ear of the battery pack 6 respectively, the contact area between the conductive bar, the pole and the pole ear is increased, the current carrying capacity is improved, and the stability of the connection is enhanced, which effectively prevents false connection and greatly enhances the safety performance of the battery.

[0086] Example 4

[0087] See also Figure 6 , Figure 7 , Fig. 9This embodiment shows a large-capacity battery structure. On the basis of Embodiment 3, an insulating sealing ring 8 is provided between the cover body 1 / 2 and the shell 3, and the cover body 1 / 2 is bolted to the shell 3 and the battery pack 6 through connecting holes 21 / 23 / 31 / 33, and an insulating layer is coated on the connection point and the surface of the bolt.

[0088] It should be noted that, in this embodiment, the overall structure of the battery is more stable and the safety is improved by means of bolt connection.

[0089] Example 5

[0090] See also Fig.11 This embodiment shows a large-capacity battery structure. On the basis of Embodiment 4, metal plates 9 are welded around the shell 3, and a cavity loop is formed between the metal plate 9 and the shell 3. The cavity is filled with a coolant, and the coolant is water.

[0091] Preferably, the metal plate 9 is welded on the edges around the shell 3 and the reinforcing ribs 32, and the welding method is full welding.

[0092] Preferably, a water inlet and a water outlet are provided on the side of the metal plate 9, and the water inlet and the water outlet are connected to the coolant circulation device through a pipeline.

[0093] It should be noted that in this embodiment, a liquid cooling circulation device is formed on the outside of the shell 3 by welding the metal plate 9, which can dissipate the heat generated by the battery in a timely and effective manner, and also has a certain explosion-proof function, which can prevent the battery from thermal runaway and ensure the safety of the battery.

[0094] Example 6

[0095] See also Figure 3 , Figure 4 , Figure 6 , Figure 7 This embodiment shows a large-capacity battery structure. On the basis of Embodiment 5, the cover 1 / 2 is a hollow structure. The temperature management unit includes a semiconductor module 4 arranged outside the shell 3 and a heat dissipation component arranged inside the cover 1 / 2. One end of the heat dissipation component extends out of the pole and is connected to the semiconductor module. A double-layer insulation pad 7 is arranged between the semiconductor module 4 and the shell 3. The double-layer insulation pad 7 includes an upper insulation pad and a lower insulation pad. The material of the upper insulation pad is a thermal conductive silicone sheet, and the material of the lower insulation pad is rubber.

[0096] Preferably, four through holes 13 / 22 matching the heat pipe 5 are provided on the lower insulating pad.

[0097] Preferably, the material of the upper insulating pad may also be one of thermally conductive PPS and thermally conductive nylon 66, with a temperature resistance of more than 260°C.

[0098] Preferably, the material of the lower insulating pad may also be one of PP and epoxy resin, with a temperature resistance of more than 130°C.

[0099] It should be noted that a heat pipe 55 is embedded in the cover 1 / 2, and the heat pipe 55 is connected to the semiconductor module 4; when the battery temperature is too high, the heat pipe 55 transfers the temperature of the cover 1 / 2 to the semiconductor module 4, and the heat is dissipated through the semiconductor module 4. When the battery temperature is too low, the battery can also be heated. In other words, whether the large-capacity battery is in a high-temperature environment or a low-temperature environment, the internal temperature of the battery can be effectively controlled to ensure that the battery is always in an optimal working state.

[0100] It should be noted that four through holes 13 / 22 matching the heat pipe 5 are provided on the lower insulating pad. The heat pipe 55 extending from the cover body 1 and 2 is extended into the through holes 13 / 22, and the upper / lower insulating layers are tightened with screws to fit tightly and fixed to the side wall of the shell 33. The temperature of the battery pack 6 inside the shell 3 can be controlled to ensure efficient operation of the battery.

[0101] It should be noted that the pole of this embodiment has a hollow structure, and the heat dissipation component is arranged inside the pole, which not only saves space but also improves the heat dissipation effect of the pole; one end of the heat dissipation component extends out of the pole and is connected to the semiconductor module, so that the battery temperature can be kept balanced.

[0102] Example 7

[0103] This embodiment shows a large-capacity battery structure. On the basis of Embodiment 6, a liquid injection and explosion relief port is provided on the side of the shell 3, and a pressure valve is provided on the liquid injection and explosion relief port.

[0104] Preferably, a three-way valve or a four-way valve with vacuuming, liquid injection and explosion relief functions is provided on the liquid injection and explosion relief port.

[0105] It should be noted that a pressure relief membrane may also be provided on the liquid injection explosion relief port. In this embodiment, multiple functions such as vacuuming, liquid injection, and explosion relief can be achieved through the same structure, which is simple in structure and easy to process and manufacture.

[0106] Example 8

[0107] This embodiment shows a method for assembling a large-capacity battery, which includes the following steps: S100: arranging the electrodes of a plurality of single cells in the same direction so that the positive and negative electrodes of the cells are on the same side, fixing them with a pressing plate 64 and bundling them with a steel belt 65 to form a battery pack 6;

[0108] S200: Connect the positive electrode tab and the negative electrode tab of the battery pack 6 to the conductive bar 62 respectively, then connect any one of the conductive bars 62 to the cover 1 / 2, and fix the battery module to the cover 1 / 2 with bolts through the connection holes of the extrusion plate 64;

[0109] S300: Place one end of the cover downward, put it on the housing 3 and fix it;

[0110] S400: placing and fixing another electrode cover;

[0111] S500: embedding the heat pipe 5 into the through hole 13 / 22 of the cover body to form two groups of heat dissipation components;

[0112] S600: Connect the two heat dissipation components to the semiconductor module 4 via the double-layer insulation pad 7 .

[0113] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment and is not intended to limit the present invention. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be deemed to belong to the scope of patent protection of the present invention as determined by the submitted claims.

Claims

1. A large-capacity battery structure, comprising a housing, a cover, a battery pack, a conductive bar and a temperature management unit, characterized in that: The battery pack is located in the shell, the cover is a pole, including a positive cover and a negative cover, the positive cover and the negative cover are respectively located on two sides of the shell, the positive cover is a positive pole, the negative cover is a negative pole, and the two ends of the conductive bar are respectively connected to the pole ears of the battery pack and the cover; the conductive bar includes a positive conductive bar and a negative conductive bar, the positive cover is welded to the positive conductive bar, and the negative cover is welded to the negative conductive bar; The cover body is a hollow structure, and the temperature management unit includes a semiconductor module arranged on the outside of the shell and a heat pipe arranged in the cover body, one end of the heat pipe extends out of the cover plate and is connected to the semiconductor module; when the battery temperature is too high, the heat pipe transfers the temperature of the cover body to the semiconductor module, and dissipates heat through the semiconductor module. When the battery temperature is too low, the battery can also be heated; metal plates are welded around the shell, and a cavity loop is formed between the metal plate and the shell, and the cavity is filled with coolant; a water inlet and a water outlet are provided on the side of the metal plate, and the water inlet and the water outlet are connected to the coolant circulation device through a pipe.

2. A large-capacity battery structure according to claim 1, characterized in that: The battery pack is composed of at least one battery cell, and the positive and negative tabs of the battery pack are located on the same side of the battery pack and are connected to the conductive bar.

3. A large-capacity battery structure according to claim 2, characterized in that: The conductive bar is a Z-shaped conductive bar, and a plurality of through slots are arranged on one long side of the Z-shaped conductive bar. The positive and negative tabs of the battery pack pass through the through slots and are vertically bent and then welded to the upper end surface of the Z-shaped conductive bar.

4. A large-capacity battery structure according to claim 1, characterized in that: The pole is provided with a welding groove, and the welding groove corresponds to the shape of the conductive bar.

5. A large-capacity battery structure according to claim 1, characterized in that: An insulating sealing ring is provided between the cover body and the shell.

6. A large-capacity battery structure according to claim 1, characterized in that: The cover body is connected to the shell body by bolts, and the connection point and the surface of the bolts are coated with an insulating layer.

7. A large-capacity battery structure according to claim 1, characterized in that: The metal plate welding points are on the edges and reinforcing ribs around the shell, and the welding method is full welding.

8. A large-capacity battery structure according to claim 1, characterized in that: The conductive bar is made of aluminum alloy or pure copper.

9. A large-capacity battery structure according to claim 1, characterized in that: The material of the cover is aluminum alloy or copper.

10. A large-capacity battery structure according to claim 1, characterized in that: A double-layer insulation pad is provided between the semiconductor module and the housing.

11. A large-capacity battery structure according to claim 10, characterized in that: The double insulation The pad comprises an upper insulating pad and a lower insulating pad, and the lower insulating pad is provided with four through holes matching the heat pipe.

12. A large-capacity battery structure according to claim 11, characterized in that: The material of the upper insulating pad is one of thermally conductive silicone sheet, thermally conductive PPS, and thermally conductive nylon 66, and can withstand temperatures above 260°C.

13. A large-capacity battery structure according to claim 12, characterized in that: The material of the lower insulating pad is one of rubber, PP and epoxy resin, and can withstand a temperature of more than 130°C.

14. A large-capacity battery structure according to claim 1, characterized in that: A liquid injection and explosion relief port is arranged on the side of the shell.

15. A large capacity battery structure according to claim 14, characterized in that: The liquid injection explosion relief port is provided with a pressure valve or a pressure relief membrane.

16. A large capacity battery structure according to claim 15, characterized in that: A three-way valve or a four-way valve with vacuuming, liquid injection and explosion relief functions is arranged on the liquid injection and explosion relief port.

17. A large-capacity battery structure according to claim 1, characterized in that: The shell is provided with reinforcing ribs.

18. A large capacity battery structure according to claim 1, characterized in that: The shell is a square metal structure made of aluminum alloy.

19. A large-capacity battery structure according to any one of claims 1 to 18 A method for assembling a pool, characterized in that The following steps are involved: S100: Arrange the electrodes of multiple single cells in the same direction so that the positive and negative electrodes of the cells are On the same side, it is fixed with extruded plates and tied with steel straps to form a battery pack; S200: Connecting the positive electrode tab and the negative electrode tab of the battery pack to the conductive bar respectively, and then connecting the conductive bar of any one electrode to the cover body, and fixing the battery module to the cover body with bolts through the connection holes of the extrusion plate; S300: Place one end face of the cover downward, put it on the shell and fix it; S400: placing and fixing another electrode cover; S500: embedding heat pipes in the through holes of the cover to form two groups of heat dissipation components; S600: Connect the two heat dissipation components to the semiconductor module via a double-layer insulation pad.

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