A laminated large-capacity lithium battery

Abstract

This invention proposes a laminated, high-capacity lithium battery, belonging to the field of energy storage battery technology. The battery comprises a terminal and multiple battery cells connected in parallel via the terminal. The terminal is provided with a heat-conducting component and a cooling / heating component. The cooling / heating component cools or heats the multiple battery cells via the heat-conducting component. This laminated, high-capacity lithium battery achieves the cooling and heating functions required for operation of a large-capacity lithium battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage batteries, and relates to large-capacity lithium battery technology, in particular to a laminated large-capacity lithium battery. Background Art

[0002] Currently, the largest-capacity square lithium battery on the market is 400Ah. Under the background of "carbon peak" and "carbon neutrality", the energy storage battery industry has developed well. At the same time, the requirements for the capacity of energy storage batteries are getting higher and higher. More and more large-capacity energy storage batteries have appeared on the market. The larger the capacity of the energy storage battery, the more heat is generated inside the battery, which makes it difficult for large-capacity lithium batteries to dissipate heat. At the same time, batteries used in extremely cold environments or environments with large temperature differences between day and night need to be heated in order to ensure normal startup and operation of the battery. Therefore, simultaneous heat dissipation and cooling of large-capacity batteries is the main problem faced by technical personnel in this field.

[0003] The invention patent with patent number 202011400301.5 discloses a lithium-ion battery, battery module and battery pack. The lithium-ion battery includes a housing and a battery cell group arranged inside the housing. The battery cell group includes multiple battery cells arranged in parallel along the length of the lithium-ion battery. Each battery cell has a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab are respectively located on both sides of the battery cell. The multiple positive electrode tabs of the multiple battery cells are connected by a first connecting piece, and the multiple negative electrode tabs of the multiple battery cells are connected by a second connecting piece. This patent mainly connects the positive electrode tab to the negative electrode tab through the first connecting piece and the second connecting piece, increases the connection contact area between the connecting piece and the tab, and conducts heat away through the first connecting piece and the second connecting piece to dissipate heat from the battery.

[0004] The utility model patent with patent number 202021196908.1 discloses a core-heating battery, comprising a shell, battery cells, a positive electrode column, a negative electrode column, and a heating electrode column; the battery cells are connected in series and parallel to form a battery; the positive and negative electrodes of the battery cells are respectively combined into a positive electrode column and a negative electrode column; a heating unit is sandwiched between the battery cells; the heating units are connected in parallel; the two ends of the heating unit have a first tab and a second tab respectively; the second tab is located inside the battery and is welded to the negative electrode; the first tab is combined on the top cover of the shell and formed into a heating electrode column by crimping a metal shell. This patent uses a heating unit to heat the core electrolyte, achieving a normal temperature of the battery core under low temperature conditions, significantly improving the low-temperature charge and discharge capabilities of the battery, and restoring the normal temperature performance of the battery under harsh low-temperature conditions.

[0005] Through the above analysis, the existing technology mainly provides a heat-conducting structure inside the battery to conduct the heat generated inside the battery through the heat-conducting structure, and promotes heat dissipation inside the battery through convection between the heat-conducting structure and the air, but its heat dissipation effect is not ideal; it is also not applicable to extremely cold environments or environments with large temperature differences between day and night; although the above disclosure provides a heating column on the battery, it is unable to conduct the heat inside the battery and dissipate the heat of the battery when the battery is overheated. Summary of the Invention

[0006] In order to solve the problem in the prior art that large-capacity lithium batteries need to be heated and cooled during operation, the present invention proposes a laminated large-capacity lithium battery.

[0007] The present invention primarily dissipates heat generated by the battery by arranging a heat conducting component and a cooling / heating component on the pole. Simultaneously, when heating is required, the cooling / heating component heats the interior of the battery to enable normal operation of the battery. This solves the problem of large-capacity lithium batteries requiring both heating and cooling during startup and operation. The specific technical solution is as follows:

[0008] A laminated large-capacity lithium battery includes a pole and multiple battery cells, wherein the multiple battery cells are connected in parallel via the pole. A heat conducting component and a cooling / heating component are provided on the pole. The cooling / heating component cools or heats the multiple battery cells via the heat conducting component.

[0009] It is further defined that a tab is connected to the battery cell body, one end or both ends of the tab extend outward to form a tab fold, and the tab is connected to the pole post through the tab fold.

[0010] It is further defined that the width of the tab fold is greater than the width of the tab.

[0011] It is further defined that a protruding conduit is provided on the shell of the battery body, the conduit is sealed, a pull ring is connected to the conduit, and a weak groove is provided on the side wall of the conduit.

[0012] It is further defined that a plurality of mounting grooves are provided on the pole, the mounting grooves are provided along the length direction of the pole, the heat conducting component is placed in the mounting grooves, and the heat conducting component is in contact with a plurality of battery cell bodies.

[0013] It is further defined that the heat conducting component is a heat spreader or a heat spreader.

[0014] It is further defined that a socket is provided on one side or both sides of the top of the pole, and the socket is used to place the cooling / heating component.

[0015] It is further defined that the cooling / heating assembly includes a heat pipe and a heating rod, and the heat pipe and the heating rod are both placed in the socket.

[0016] It is further defined that the cooling / heating assembly further includes a semiconductor cooler, and the semiconductor cooler is connected to the heat pipe.

[0017] It is further defined that the semiconductor cooler is placed above the battery cell body.

[0018] It is further defined that a fixing groove is provided on the top of the pole, a heating plate and a heat spreader are provided in the fixing groove, and the heat spreader is connected to the semiconductor cooler.

[0019] It is further defined that the interior of the pole is a hollow structure, the hollow structure is a vacuum cavity, the hollow structure is filled with a heat-conducting fire extinguishing medium, and a fusible alloy part is provided on the pole, and the melting point of the fusible alloy part is greater than 130°C.

[0020] It is further defined that the heat-conducting fire extinguishing medium is water, perfluorohexanone or halogenated alkane.

[0021] It is further defined that multiple layers of screens are stacked in the hollow structure to form capillary pores, and the capillary pores are arranged along the length direction of the pole.

[0022] It is further defined that the pole is a ladder-shaped pole or a wedge-shaped pole with a large top cross-sectional area and a small bottom cross-sectional area.

[0023] It is further defined that the tabs include a positive tab and a negative tab, the positive tab and the negative tab are respectively arranged on opposite sides of the battery cell body, the positive tab is an aluminum plate, and the negative tab is a copper-aluminum composite plate.

[0024] It is further defined that the shell of the battery cell body is a plastic shell.

[0025] It is further defined that the melting point of the plastic shell is greater than 130°C.

[0026] It is further defined that the material of the plastic shell is one or a combination of two or more of polyoxymethylene, polyvinyl chloride, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate and polyester resin.

[0027] It is further defined that the laminated large-capacity lithium battery also includes a battery outer shell and a battery upper cover, the pole, multiple battery cell bodies and heat pipes are all placed in the inner cavity of the battery outer shell, and the battery upper cover is arranged at the top opening of the battery outer shell; the heat pipe passes through the battery upper cover, extends to the top of the battery upper cover and is connected to the semiconductor cooler; the pole passes through the battery upper cover and extends to the top of the battery upper cover.

[0028] It is further defined that a cover plate clamping platform is provided on the top of the pole, a clamping groove is provided on the battery upper cover, and the cover plate clamping platform is clamped in the clamping groove to fix the pole and the battery upper cover.

[0029] It is further defined that a heat pipe panel is provided on the top of the battery upper cover plate, the heat pipe passes through the heat pipe panel and is fixedly connected to the battery upper cover plate through the heat pipe panel; the cover plate clamp passes through the heat pipe panel and extends above the heat pipe panel; a pole wiring hole is provided on the top of the pole.

[0030] It is further defined that a C-shaped insulating sealing ring is provided on the contact surface between the clamping groove of the battery upper cover and the cover clamping platform.

[0031] It is further defined that an opening is provided on the insulating pad, and the top of the C-shaped insulating sealing ring passes through the opening and extends above the opening.

[0032] It is further defined that the heat pipe panel and the pole compress the C-shaped insulating sealing ring.

[0033] It is further defined that heat dissipation fins are provided on the battery outer shell.

[0034] It is further defined that a pressure relief port is provided on the battery upper cover plate, and a pressure relief assembly is provided at the pressure relief port.

[0035] It is further defined that the pressure relief component is a pressure relief membrane or a pressure relief valve.

[0036] It is further defined that the pressure relief valve is a spring-loaded pressure relief valve or a diaphragm-loaded pressure relief valve.

[0037] It is further defined that a gas processing device is provided above the pressure relief port, and the pressure relief port is connected to the gas processing device through a pressure relief assembly.

[0038] It is further defined that the gas processing device includes a containing box body, a pressure relief gas inlet is provided at the bottom of the containing box body, a residual gas outlet is provided at the top of the containing box body, and a cooling adsorption layer is provided in the inner cavity of the containing box body.

[0039] It is further defined that the cooling adsorption layer includes a cooling layer and an adsorption layer arranged in sequence from bottom to top along the gas flow direction.

[0040] It is further defined that the cooling layer is one or a combination of two or more of ceramic balls, honeycomb ceramic sheets, porous ceramics and graphite rods.

[0041] It is further defined that the adsorption layer is one or a combination of two or more of activated carbon, porous silica, molecular sieve, porous ceramic and adsorption resin.

[0042] It is further defined that a collection bag is provided at the residual gas outlet, and the collection bag is used to collect the residual gas after cooling and adsorption.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The present invention relates to a laminated large-capacity lithium battery, comprising a pole and a plurality of battery cell bodies. The plurality of battery cell bodies are connected in parallel via the pole, and a heat-conducting component and a cooling / heating component are provided on the pole. The cooling / heating component cools or heats the plurality of battery cell bodies via the heat-conducting component. The heat generated by the battery cell body during operation can be conducted to the cooling / heating component by the heat-conducting component, and the heat can be dissipated by the cooling / heating component, thereby reducing the risk of thermal runaway caused by local overheating inside the large-capacity lithium battery. The cooling / heating component can heat the large-capacity lithium battery when it is in a low-temperature environment or an environment with a large temperature difference between day and night, so that the large-capacity lithium battery can operate normally. The laminated large-capacity lithium battery of the present invention realizes the cooling and heating functions required for the operation of the large-capacity lithium battery.

[0045] 2. A tab fold is provided on the tab, which facilitates the fixed connection between the tab and the pole, and increases the connection area between the tab and the pole after connection, ensuring good contact between the tab and the pole.

[0046] 3. A protruding conduit is provided on the cell housing, connected to a pull ring, and a weakened slot is provided on the side wall of the conduit. The pull ring can be used to pull the conduit away from the weakened slot, allowing multiple cells to share the same electrolyte and avoiding the influence of differences between the cells during operation.

[0047] 4. Multiple mounting slots are provided along the length of the pole. The heat spreader tubes are placed in the mounting slots, and each mounting slot corresponds to a heat spreader tube. The mounting slots facilitate the fixed connection between the heat spreader tube and the pole.

[0048] 5. A socket is also provided on the pole, and a heat pipe is inserted into the socket. The heat-scaling pipe is connected to the semiconductor cooler through the heat pipe. The heat on the heat-scaling pipe can be transferred to the semiconductor cooler through the heat pipe, and the heat is dissipated through convection between the semiconductor cooler and the air; thus, the heat dissipation efficiency of large-capacity lithium batteries is improved.

[0049] 6. A heating rod is also provided in the socket, which heats the battery when the battery is in a low temperature environment or an environment with a large temperature difference between day and night, ensuring that the battery can work and start normally.

[0050] 7. The cooling / heating assembly also includes a semiconductor cooler, which is connected to the heat pipe. The semiconductor cooler improves the heat dissipation efficiency of the heat pipe.

[0051] 8. The interior of the pole is a hollow structure, which is a vacuum cavity filled with a heat-conducting fire-extinguishing medium. The pole is provided with a fusible alloy part. When the battery experiences thermal runaway, the weak point melts under the action of high temperature and releases the heat-conducting fire-extinguishing medium into the battery to extinguish the battery, prevent the thermal runaway from further deterioration, and control the thermal runaway. Multiple layers of screens are stacked in the hollow structure to form capillary pores, which are arranged along the length of the pole. The capillary pores make the pole equivalent to a heat pipe, realizing two-way heat conduction, which can transfer the heat generated by the battery to the heat pipe through the heat-conducting component to dissipate the heat of the battery; and can also transfer the heat generated by the battery heating rod to the battery through the heat-conducting component to heat the battery.

[0052] 9. The pole is a ladder-shaped pole or a wedge-shaped pole with a large cross-sectional area at the top and a small cross-sectional area at the bottom. For large-capacity batteries, the current increases as the pole moves upward. This setting can prevent the pole from overburning; it also saves materials and reduces costs.

[0053] 10. The battery outer shell is provided with heat dissipation fins, which can dissipate the heat generated inside the battery, further improving the heat dissipation efficiency.

[0054] 11. The laminated large-capacity lithium battery of the present invention further comprises a battery outer shell and a battery upper cover. The poles, multiple battery cells and heat-equalizing tubes are placed in the inner cavity of the battery outer shell. The battery outer shell and the battery upper cover form a closed space for the battery cells to work. When the battery cells are working, each battery cell can be connected to the inner cavity of the battery outer shell, so that the interior of the battery cell and the inner cavity of the battery outer shell form a common electrolyte system, thereby enhancing the consistency of the battery cells when working.

[0055] 12. A cover plate clamp is provided on the top of the pole, and a clamping groove is provided on the battery cover. The cover plate clamp is clamped into the clamping groove to fix the pole and the battery cover. The cover plate clamp facilitates the fixed connection between the pole and the battery cover.

[0056] 13. A C-shaped insulating sealing ring is provided at the joint between the cover plate clamping platform and the clamping groove. The C-shaped insulating sealing ring makes the cover plate clamping platform and the battery upper cover plate in an insulated state, thereby increasing the safety of the battery during operation.

[0057] 14. A heat pipe panel is installed on the top of the battery cover to secure the heat pipe and compress the battery cover. The cover clamp is equipped with a terminal hole to facilitate parallel or series connection of large-capacity lithium batteries or connection to external devices that require power.

[0058] 15. An insulating pad is installed between the heat pipe panel and the battery cover. The insulating pad enhances the insulation performance of the large-capacity lithium battery and improves the safety of the battery during operation.

[0059] 16. A gas treatment device is provided above the pressure relief port, and the pressure relief port is connected to the gas treatment device through a pressure relief assembly. The gas treatment device can cool the combustible gas generated by thermal runaway of the battery and absorb the combustible components therein, thereby preventing the combustible gas from coming into contact with air / oxygen and causing explosion or fire.

[0060] 17. A collection bag is provided at the residual gas outlet to collect the residual gas after cooling and adsorption, preventing the residual gas from being directly discharged into the air and polluting the atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 Schematic diagram of the structure of the battery cell body of the present invention;

[0062] Figure 2 It is a structural diagram of a battery cell body with folded edge of the tab;

[0063] Figure 3 Schematic diagram of the structure of the pole of the present invention;

[0064] Figure 4 This is a schematic structural diagram of the compression shell of the battery pack of the present invention;

[0065] Figure 5 This is a schematic diagram of the structure of the connection between the electrode and the battery body of the present invention;

[0066] Figure 6 This is a schematic diagram of the assembly of the battery cover and the terminal;

[0067] Figure 7 This is an overall schematic diagram of a laminated large-capacity lithium battery of the present invention;

[0068] Figure 8 This is a schematic diagram of the structure of a laminated large-capacity lithium battery with a semiconductor cooler;

[0069] Figure 9 Schematic diagram of the structure of a pole with a hollow cavity;

[0070] Figure 10 Schematic diagram of the pole structure with a heat spreader or heating plate on the top;

[0071] Figure 11 It is a structural diagram of a ladder-shaped pole;

[0072] Figure 12 Schematic diagram of the structure of a wedge-shaped pole;

[0073] Figure 13Schematic diagram of the structure of the grid-shaped conductive sheet;

[0074] Figure 14 Schematic diagram of the structure of the gas processing device;

[0075] Among them, 1-battery cell body, 101-conduit, 2-ear, 201-ear folding edge, 3-pole, 301-mounting groove, 302-jack, 303-pole wiring hole, 304-cover card base, 305-easy-to-use metal parts, 306-heating plate, 4-battery cell group compression shell, 5-battery outer shell, 6-battery upper cover, 7-sealing rubber ring, 8-C-type insulating sealing ring, 9-insulating pad, 10-heat pipe insert, 11-heat pipe, 12-semiconductor refrigerator, 13-grid conductive sheet, 1301-fusible metal weak groove, 14-pressure relief gas inlet, 15-cooling layer, 16-adsorption layer, 17-residual gas outlet. DETAILED DESCRIPTION

[0076] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0077] The present invention discloses a laminated, high-capacity lithium battery comprising a terminal post 3 and multiple battery cells 1. The multiple battery cells 1 are connected in parallel via the terminal post 3. A thermal conductive component and a cooling / heating component are provided on the terminal post 3. The cooling / heating component cools or heats the multiple battery cells 1 via the thermal conductive component. A tab 2 is connected to the battery cell 1. One or both ends of the tab 2 extend outward to form a tab fold 201. The tab 2 is connected to the terminal post 3 via the tab fold 201. The tab fold 201 is wider than the tab 2. A sealed, protruding conduit 101 is provided on the housing of the battery cell 1. The conduit 101 is connected to a pull ring, and a weakening groove is provided on the sidewall of the conduit 101. The terminal post 3 is provided with multiple mounting slots 301, extending along the length of the terminal post 3. The thermal conductive component is positioned within the mounting slots 301, contacting the multiple battery cells 1. The thermal conductive component is a heat spreader or heat spreader. A socket 302 is provided on one or both sides of the top of the pole 3. The socket 302 is used to place the cooling / heating assembly. The cooling / heating assembly includes a heat pipe 11 and a heating rod, both of which are placed in the socket 302. The cooling / heating assembly also includes a semiconductor cooler 12, which is connected to the heat pipe 11. The semiconductor cooler 12 is placed above the battery cell body 1. A fixing groove is provided on the top of the pole 3, and a heating plate 306 and a heat spreader are provided in the fixing groove. The heat spreader is connected to the semiconductor cooler. The interior of the pole 3 is a hollow structure, which is a vacuum cavity filled with a heat-conducting fire-extinguishing medium. A fusible alloy part 305 is provided on the pole 3. The melting point of the fusible alloy part 305 is greater than 130°C. The heat-conducting fire-extinguishing medium is water, perfluorohexanone or a halogenated alkane. Multiple layers of screens are stacked in the hollow structure to form capillary pores, and the capillary pores are arranged along the length of the pole 3. The electrode 3 is a ladder-shaped or wedge-shaped electrode with a large top cross-sectional area and a small bottom cross-sectional area. The tabs 2 include a positive tab and a negative tab, which are disposed on opposite sides of the battery cell body 1. The positive tab is an aluminum plate, while the negative tab is a copper-aluminum composite plate. The battery cell body 1 comprises a plastic shell. The melting point of the plastic shell is greater than 130°C. The plastic shell is made of one or a combination of two or more of the following: polyoxymethylene, polyvinyl chloride, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyester resin. The laminated large-capacity lithium battery also includes a battery outer shell 5 and a battery upper cover 6. The pole 3, multiple battery cell bodies 1, and heat absorbing pipes are all placed in the inner cavity of the battery outer shell 5. The battery upper cover 6 is set at the top opening of the battery outer shell 5. The heat pipe 11 passes through the battery upper cover 6, extends to the top of the battery upper cover 6 and connects to the semiconductor cooler 12. The pole 3 passes through the battery upper cover 6 and extends to the top of the battery upper cover 6. A cover plate clamping platform 304 is provided on the top of the pole 3. The battery upper cover 6 is provided with a clamping groove. The cover plate clamping platform 304 is clamped into the clamping groove to fix the pole 3 to the battery upper cover 6.A C-shaped insulating seal 8 is installed at the connection between the cover plate clamp 304 and the clamping groove. A heat pipe panel 10 is installed on the top of the battery upper cover plate 6. Heat pipes 11 pass through this panel and are fixedly connected to the battery upper cover plate 6 through it. The cover plate clamp 304 extends through this panel and extends above it. A terminal connection hole is provided at the top of the terminal 3. A C-shaped insulating seal 8 is installed at the contact surface between the clamping groove of the battery upper cover plate 6 and the cover plate clamp 304. An opening is provided in the insulating gasket 9. The top of the C-shaped insulating seal 8 passes through the opening and extends above the opening. The heat pipe panel 10 and the terminal 3 compress the C-shaped insulating seal 8. The battery outer shell 5 is provided with heat dissipation fins. A pressure relief vent is provided on the battery upper cover plate 6, and a pressure relief assembly is installed at the pressure relief vent. The pressure relief assembly is a pressure relief membrane or a pressure relief valve. The pressure relief valve is a spring-loaded pressure relief valve or a diaphragm-type pressure relief valve. A gas processing device is provided above the pressure relief port, and the pressure relief port is connected to the gas processing device through a pressure relief assembly. The gas processing device includes a containing box, a pressure relief gas inlet 14 is provided at the bottom of the containing box, a residual gas outlet 17 is provided at the top of the containing box, and a cooling adsorption layer is provided in the inner cavity of the containing box. The cooling adsorption layer includes a cooling layer 15 and an adsorption layer 16, which are arranged in sequence from bottom to top along the gas flow direction. The cooling layer 15 is one or a combination of two or more of ceramic balls, honeycomb ceramic sheets, porous ceramics and graphite rods. The adsorption layer 16 is one or a combination of two or more of activated carbon, porous silica, molecular sieves, porous ceramics and adsorption resins. A collection bag is provided at the residual gas outlet 17, and the collection bag is used to collect the residual gas after cooling and adsorption.

[0078] Example 1

[0079] See also Figures 1-4 This embodiment provides a laminated, high-capacity lithium battery comprising a terminal post 3 and 20 battery cells 1. A heat-conducting assembly and a cooling / heating assembly are provided on the terminal post 3. The cooling / heating assembly cools or heats the multiple battery cells 1 via the heat-conducting assembly. There are two terminals, a positive terminal post and a negative terminal post. Each battery cell 1 is provided with two tabs 2, one positive and one negative. The positive tabs of the 20 battery cells 1 are connected in parallel via the positive terminal post, and the negative tabs of the 20 battery cells 1 are connected in parallel via the negative terminal post.

[0080] In this embodiment, a protruding conduit 101 is provided on the shell of the battery cell body 1. The conduit 101 is provided on the side of the battery cell body 1, and the position of the conduit 101 does not conflict with the setting position of the positive electrode tab and the negative electrode tab; the conduit 101 is in a sealed state; it is sealed by a sealing plug or sealant, a pull ring is provided on the conduit 101, and a weak groove is provided on the side wall of the conduit 101; when the pull ring is pulled, the conduit 101 breaks along the weak groove.

[0081] Preferably, a pull ring is provided at the end of the catheter 101 .

[0082] The 20 battery cell bodies 1 of this embodiment are stacked and pressed in sequence from top to bottom to form a battery module of a large-capacity battery. A splint is set below the bottom battery cell body 1, and a splint is set above the top battery cell body 1. The 20 battery cell bodies 1 are fixed and limited by the two splints.

[0083] Preferably, the pole 3 of this embodiment is made of aluminum. It should be noted that the number of the battery cell bodies 1 of this embodiment can be 5, 10, 15, 25, 30, 35, or even more, and the specific number can be increased or decreased according to the capacity requirements of the large-capacity lithium battery.

[0084] Example 2

[0085] This embodiment provides a laminated, high-capacity lithium battery comprising a pole 3 and 30 battery cells 1. A heat-conducting assembly and a cooling / heating assembly are provided on the pole 3. The cooling / heating assembly cools or heats the multiple battery cells 1 via the heat-conducting assembly. There are two poles, one positive and one negative. Each battery cell 1 is provided with two tabs 2, one positive and one negative. The positive tabs of the 30 battery cells 1 are connected in parallel via the positive poles, and the negative tabs of the 30 battery cells 1 are connected in parallel via the negative poles.

[0086] See also Figure 5 Eight mounting slots 301 are provided on each of the positive and negative electrode posts. These slots 301 are arranged in parallel along the length of the positive and negative posts, and on the same side of the positive and negative posts. The heat conducting component is a heat spreader or heat spreader bar. Preferably, the heat conducting component of this embodiment is a heat spreader bar, with one heat spreader or heat spreader bar fixedly installed in each installation. The 30 battery cell bodies 1 are in close contact with the heat spreader and heating tubes on the positive and negative posts, and the heat spreader is connected to the cooling / heating assembly.

[0087] Further preferably, the heat spreader bar of this embodiment is an aluminum heat spreader bar.

[0088] Preferably, the 30 battery cell bodies 1 of this embodiment are compressed and fixed by the battery cell group compression shell 4 .

[0089] It should be noted that the number of the mounting slots 301 in this embodiment can be 3, 5, 10, 15, or even more, and the number can be increased or decreased according to the capacity of the battery.

[0090] It should be noted that the number of battery cell bodies 1 in this embodiment can be 5, 10, 15, 25, 30, 35, or even more, and the specific number can be increased or decreased according to the capacity requirements of the large-capacity lithium battery.

[0091] Based on Example 1 and Example 2, the present invention is provided with a socket 302 on one or both sides of the top of the pole 3. Preferably, a socket 302 is provided on both sides of the top of the pole 3, and the socket 302 is used to plug in the cooling / heating component.

[0092] See also Figure 8 The cooling / heating assembly of the present invention includes a heat pipe 11, a heating rod, and a semiconductor cooler 12. A heat pipe 11 and a heating rod are inserted into each socket 302. The heat pipe 11 and the heating rod are both connected to a heat spreader or a heat spreader pipe. The top of the heat pipe 11 is in close contact with the semiconductor cooler 12. The semiconductor cooler 12 is placed above the battery cell body 1.

[0093] See also Figure 10 Preferably, the present invention further provides a fixing groove at the top of the pole 3, which is arranged along the width direction of the pole 3, and a heating plate 306 and a heat spreader are installed in the fixing groove. Preferably, the heating plate 306 and the heat spreader are both connected to the heat spreader tube.

[0094] Preferably, the heat-absorbing tubes in this embodiment are copper tubes and aluminum tubes containing heat-conducting medium.

[0095] See also Figure 9 The interior of the pole 3 of the present invention is a hollow structure, and the hollow structure is a vacuum cavity. The hollow structure is filled with a heat-conducting fire-extinguishing medium. A fusible alloy part 305 is provided on the pole 3, and the melting point of the fusible alloy part 305 is greater than 130°C. When thermal runaway occurs inside the battery, the high temperature environment generated by the thermal runaway causes the fusible alloy part 305 to open, and the heat-conducting fire-extinguishing medium in the hollow structure is sprayed into the interior of the battery to extinguish the fire of the battery and control the thermal runaway. Multiple layers of screens are stacked in the hollow structure to form capillary pores, and the capillary pores are arranged along the length direction of the pole 3. The capillary pores and the heat-conducting fire-extinguishing medium work together to make the pole a heat pipe, which can conduct heat in both directions.

[0096] It should be noted that the above-mentioned heat-conducting fire extinguishing medium is water, perfluorohexanone or halogenated alkane. Preferably, the heat-conducting fire extinguishing medium is perfluorohexanone.

[0097] See also Figure 11 and 12 Preferably, the pole 3 of the present invention is a ladder-shaped pole or a wedge-shaped pole with a large top cross-sectional area and a small bottom cross-sectional area. This structure can effectively prevent the pole 3 from overburning, while saving material and cost.

[0098] Preferably, the positive electrode tab and the negative electrode tab of the present invention are respectively arranged on two opposite sides of the battery cell body 1, the positive electrode tab is an aluminum plate, and the negative electrode tab is a copper-aluminum composite plate.

[0099] Preferably, the shell of the battery cell body 1 of the present invention is a plastic shell, and the melting point of the plastic shell is greater than 130°C.

[0100] It should be noted that the material of the plastic shell is one or a combination of two or more of polyoxymethylene, polyvinyl chloride, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate and polyester resin. Preferably, the material of the plastic shell is polyoxymethylene or polyvinyl chloride.

[0101] See also Figure 6 and Figure 7 The laminated large-capacity lithium battery of the present invention also includes a battery outer shell 5 and a battery upper cover 6. The pole 3, all the battery cell bodies 1 and the heat-equalizing tube are placed in the inner cavity of the battery outer shell 5. The battery outer shell 5 is a rectangular cylindrical structure with an open top. A battery upper cover 6 is provided at the top opening of the battery outer shell 5. The battery upper cover 6 is fixedly connected to the upper end surface of the battery outer shell 5. One end of the heat pipe 11 is inserted into the socket 302, and the other end of the heat pipe 11 passes through the battery upper cover 6 and extends to the top of the battery upper cover 6, and is in contact with the semiconductor cooler 12; the pole 3 passes through the battery upper cover 6 and extends to the top of the battery upper cover 6.

[0102] Preferably, the battery upper cover plate 6 of the present invention is welded to the upper end surface of the battery outer shell 5 or bonded by adhesive.

[0103] In the present invention, a pressure relief port is provided on the battery upper cover plate 6, and a pressure relief assembly is installed at the pressure relief port.

[0104] Preferably, the pressure relief component is a pressure relief membrane or a pressure relief valve.

[0105] A further preferred pressure relief valve is a spring-type pressure relief valve or a diaphragm-type pressure relief valve.

[0106] The present invention provides a cover plate clamping platform 304 on the top of the pole 3, and the cover plate clamping platform 304 is fixedly connected to the pole 3. A clamping groove is provided on the battery upper cover 6, and the cover plate clamping platform 304 is clamped in the clamping groove to fix the pole 3 to the battery upper cover 6.

[0107] Preferably, the present invention provides a C-shaped insulating sealing ring 8 at the connection between the cover plate clamping platform 304 and the clamping groove.

[0108] Preferably, the present invention is provided with heat dissipation fins on the battery outer shell 6. The heat generated inside the battery can be dissipated through the heat dissipation fins.

[0109] Preferably, the present invention provides a sealing rubber ring 7 between the contact surface of the cover plate clamping platform 304 and the battery upper cover plate 6, and the sealing rubber ring 7 is used to seal the battery upper cover plate 6 and the battery outer shell 5 to prevent the electrolyte in the battery outer shell 5 from leaking.

[0110] Preferably, the C-shaped insulating sealing ring 8 and the sealing rubber ring 7 of the present invention are made of rubber or plastic.

[0111] The present invention provides a heat pipe panel 10 on top of the battery cover plate 6. Heat pipes 11 extend through the panel 10 and are fixedly connected to the battery cover plate 6 via the panel 10. A cover plate clamp 304 extends through the panel 10 and extends above the panel 10. A pole wiring hole 303 is provided on the cover plate clamp 304. The pole wiring hole 303 is a through hole that passes through the upper and lower end surfaces of the cover plate clamp 304. The bottom of the pole wiring hole 303 contacts the pole 3. Preferably, an insulating pad 9 is provided between the heat pipe panel 10 and the battery cover plate 6.

[0112] See also Figure 14 The present invention provides a gas processing device above the pressure relief port, which is connected to the gas processing device via a pressure relief assembly. The gas processing device includes a housing, a pressure relief gas inlet 14 at the bottom of the housing, a residual gas outlet 17 at the top of the housing, and a cooling adsorption layer within the interior of the housing.

[0113] Preferably, the cooling adsorption layer of the present invention includes a cooling layer 15 and an adsorption layer 16 arranged sequentially from bottom to top along the direction of gas flow. Cooling layer 15 is one or a combination of two or more of ceramic balls, honeycomb ceramic sheets, porous ceramics, and graphite rods. Adsorption layer 16 is one or a combination of two or more of activated carbon, porous silica, molecular sieves, porous ceramics, and adsorption resins. A collection bag is provided at the residual gas outlet 17 to collect the residual gas after cooling and adsorption.

[0114] The assembly method of a laminated large-capacity lithium battery of this embodiment is as follows: a heat spreader or a heat spreader is fixed in the mounting groove 301; the battery body 1 is divided into capacity and group, multiple battery bodies 1 of the same group are fixed by a battery group compression shell 4 to form a battery module, or multiple battery bodies 1 of the same group are fixed and limited by a clamping plate to form a battery module, the battery bodies 1 of the same group are connected by a positive pole and a negative pole, a catheter pulling line is tied to the pull ring of each battery body 1, the catheters on each battery body 1 are connected in series, and the positive pole, negative pole and battery module are all placed in the battery outer shell 5. The battery upper cover 6 is placed in the cavity, and the catheter pulling wire is passed through the pressure relief port on the battery upper cover 6. The battery upper cover 6 is clamped with the positive electrode column and the negative electrode column, and the battery upper cover 6 is fixedly connected to the upper end surface of the battery outer shell 5. The catheter pulling wire is pulled to separate the pull ring from the catheter 101, so that the interior of the battery cell body 1 is connected with the inner cavity of the battery outer shell 5. The multiple battery cell bodies 1 and the inner cavity of the battery outer shell 5 share the electrolyte. After the inner cavity of the battery outer shell 5 is evacuated, the electrolyte is filled into the inner cavity of the battery outer shell 5. After filling, the pressure relief assembly is installed at the pressure relief port.

[0115] The battery cells 1 can be divided into three groups: Group A, Group B, and Group C. Group A has a capacity range of 40-40.5Ah, an internal resistance range of 0.9-1mΩ, a self-discharge range of less than 2% per month, and a voltage range of 3.2±0.1V. Group B has a capacity range of 39.5-40Ah, an internal resistance range of 1-1.1mΩ, a self-discharge range of less than 2% per month, and a voltage range of 3.2±0.01V. Group C has a capacity range of less than 39.5Ah or greater than 40.5, an internal resistance range of less than 0.9mΩ or greater than 1.1mΩ, a self-discharge range of more than 4% per month, and a voltage range outside of 3.2±0.01V. During assembly, Group A is assembled with Group A, Group B with Group B, and Group C is discarded.

[0116] See also Figure 13 When the laminated large-capacity lithium batteries of the present invention are connected in series or parallel, the poles 3 between two adjacent laminated large-capacity lithium batteries can be connected through a conductive aluminum busbar. The conductive aluminum busbar is formed by 1 layer, 2 layers, 3 layers, or even more layers of grid-shaped conductive sheets 13. A fusible metal weak groove 1301 is provided on the grid-shaped conductive sheet 13. The fusible metal weak groove 1301 can cause thermal runaway inside a battery and melt through the fusible metal weak groove 1301 to protect the normally operating battery.

[0117] It should be noted that the fusible alloy parts or other fusible parts such as the fusible metal weak grooves of the present invention are all made of alloy materials, specifically tin-lead alloy, tin-bismuth alloy or lead-bismuth alloy.

[0118] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments and is not intended to limit the present invention. For those skilled in the art, several simple deductions or replacements can be made without departing from the concept of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be deemed to fall within the scope of patent protection of the present invention as determined by the submitted claims.

Claims

1. A laminated large-capacity lithium battery, characterized in that: It includes a pole and multiple battery cells, the multiple battery cells are connected in parallel through the pole, the pole is provided with a heat conduction component and a cooling / heating component, and the cooling / heating component cools or heats the multiple battery cells through the heat conduction component; The shell of the battery cell body is provided with a protruding conduit, the conduit is sealed, a pull ring is connected to the conduit, and a weak groove is provided on the side wall of the conduit; the pull ring is provided at the end of the conduit.

2. The laminated large-capacity lithium battery according to claim 1, characterized in that: The battery cell body is connected to a tab, one end or both ends of the tab extend outward to form a tab fold, and the tab is connected to the pole via the tab fold.

3. The laminated large-capacity lithium battery according to claim 2, characterized in that: The width of the tab fold is greater than the width of the tab.

4. The laminated large-capacity lithium battery according to claim 3, characterized in that: The pole is provided with a plurality of mounting grooves, the mounting grooves being arranged along the length direction of the pole, the heat conducting components being placed in the mounting grooves, and the heat conducting components being in contact with a plurality of battery cell bodies.

5. The laminated large-capacity lithium battery according to claim 4, characterized in that: The heat conducting component is a heat spreader or a heat spreader.

6. The laminated large-capacity lithium battery according to claim 5, characterized in that: One side or both sides of the top of the pole are provided with a socket, and the socket is used for placing the cooling / heating component.

7. The laminated large-capacity lithium battery according to claim 6, characterized in that: The cooling / heating assembly includes a heat pipe and a heating rod, and the heat pipe and the heating rod are both placed in the socket.

8. The laminated large-capacity lithium battery according to claim 7, characterized in that: The cooling / heating assembly further comprises a semiconductor refrigerator, which is connected to the heat pipe.

9. The laminated large-capacity lithium battery according to claim 8, characterized in that: The semiconductor refrigerator is placed above the battery body.

10. The laminated large-capacity lithium battery according to claim 8 or 9, characterized in that: A fixing groove is provided on the top of the pole, a heating plate and a heat spreader are provided in the fixing groove, and the heat spreader is connected to the semiconductor cooler.

11. The laminated large-capacity lithium battery according to claim 8 or 9, characterized in that: The interior of the pole is a hollow structure, which is a vacuum cavity and is filled with a heat-conducting fire-extinguishing medium. A fusible alloy part is provided on the pole, and the melting point of the fusible alloy part is greater than 130°C.

12. The laminated large-capacity lithium battery according to claim 11, wherein: The heat-conducting fire extinguishing medium is water, perfluorohexanone or halogenated alkane.

13. The laminated large-capacity lithium battery according to claim 12, wherein: Multiple layers of screens are stacked in the hollow structure to form capillary pores, and the capillary pores are arranged along the length direction of the pole.

14. The laminated large-capacity lithium battery according to claim 13, wherein: The pole is a ladder-shaped pole or a wedge-shaped pole with a large top cross-sectional area and a small bottom cross-sectional area.

15. The laminated large-capacity lithium battery according to claim 2 or 3, characterized in that: The tabs include a positive tab and a negative tab, which are respectively arranged on opposite sides of the battery cell body. The positive tab is an aluminum plate, and the negative tab is a copper-aluminum composite plate.

16. The laminated large-capacity lithium battery according to claim 15, characterized in that: The shell of the battery cell body is a plastic shell.

17. The laminated large-capacity lithium battery according to claim 16, wherein: The melting point of the plastic shell is greater than 130°C.

18. The laminated large-capacity lithium battery according to claim 17, wherein: The material of the plastic shell is one or a combination of two or more of polyoxymethylene, polyvinyl chloride, polypropylene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate and polyester resin.

19. The laminated large-capacity lithium battery according to claim 14, wherein: The laminated large-capacity lithium battery also includes a battery outer shell and a battery upper cover. The pole, multiple battery cell bodies and heat pipes are all placed in the inner cavity of the battery outer shell. The battery upper cover is arranged at the top opening of the battery outer shell; the heat pipe passes through the battery upper cover, extends to the top of the battery upper cover and is connected to the semiconductor cooler; the pole passes through the battery upper cover and extends to the top of the battery upper cover.

20. The laminated large-capacity lithium battery according to claim 19, wherein: A cover plate clamping platform is provided on the top of the pole, a clamping groove is provided on the battery upper cover, and the cover plate clamping platform is clamped in the clamping groove.

21. The laminated large-capacity lithium battery according to claim 20, characterized in that: A heat pipe inlay is provided on the top of the battery upper cover plate, the heat pipe passes through the heat pipe inlay and is fixedly connected to the battery upper cover plate through the heat pipe inlay; the cover plate clamp passes through the heat pipe inlay and extends above the heat pipe inlay; a pole wiring hole is provided on the top of the pole.

22. The laminated large-capacity lithium battery according to claim 21, wherein: A C-shaped insulating sealing ring is provided on the contact surface between the clamping groove of the battery upper cover plate and the cover plate clamping platform.

23. The laminated large-capacity lithium battery according to claim 21, characterized in that: An insulating pad is provided between the heat pipe panel and the battery upper cover plate. An opening is provided on the insulating pad. The top of the C-shaped insulating sealing ring passes through the opening and extends above the opening.

24. The laminated large-capacity lithium battery according to claim 23, wherein: The heat pipe panel and the pole press the C-shaped insulating sealing ring tightly.

25. The laminated large-capacity lithium battery according to claim 24, characterized in that: The battery outer shell is provided with heat dissipation fins.

26. The laminated large-capacity lithium battery according to claim 25, characterized in that: The battery upper cover is provided with a pressure relief port, and a pressure relief component is provided at the pressure relief port.

27. The laminated large-capacity lithium battery according to claim 26, characterized in that: The pressure relief component is a pressure relief membrane or a pressure relief valve.

28. The laminated large-capacity lithium battery according to claim 27, characterized in that: The pressure relief valve is a spring-type pressure relief valve or a diaphragm-type pressure relief valve.

29. The laminated large-capacity lithium battery according to claim 28, characterized in that: A gas processing device is provided above the pressure relief port, and the pressure relief port is communicated with the gas processing device through a pressure relief assembly.

30. The laminated large-capacity lithium battery according to claim 29, characterized in that: The gas processing device comprises a containing box body, a pressure relief gas inlet is provided at the bottom of the containing box body, a residual gas outlet is provided at the top of the containing box body, and a cooling adsorption layer is provided in the inner cavity of the containing box body.

31. The laminated large-capacity lithium battery according to claim 30, characterized in that: The cooling adsorption layer comprises a cooling layer and an adsorption layer which are sequentially arranged from bottom to top along the gas flow direction.

32. The laminated large-capacity lithium battery according to claim 31, wherein: The cooling layer is one of ceramic balls, honeycomb ceramic sheets, porous ceramics and graphite rods, or a combination of two or more.

33. The laminated large-capacity lithium battery according to claim 32, characterized in that: The adsorption layer is one or a combination of two or more of activated carbon, porous silica, molecular sieve, porous ceramics and adsorption resin.

34. The laminated large-capacity lithium battery according to claim 33, characterized in that: A collection bag is provided at the residual gas outlet, and the collection bag is used to collect the residual gas after cooling and adsorption.

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