Overall structure of a high-capacity battery

Abstract

The present invention discloses an overall structure of a large-capacity battery, belonging to the field of batteries. It includes at least one battery module. The battery module includes a housing, a cover, a battery cell group, an electrode connecting member, and a current collector. The battery cell group is located inside the housing. Two ends of the electrode connecting member are respectively connected to the tabs of the battery cell group and the current collector. The current collectors are arranged on both sides outside the housing. By arranging the current collectors outside the battery housing, heat can be dissipated in a timely and effective manner; at the same time, the internal space of the battery is saved, and the energy density of the large-capacity battery is greatly improved. When multiple single cells are connected in series, equal-numbered and oppositely-directed loop-shaped slots are provided on the current collectors on both sides of the battery, so that multiple large-capacity batteries are connected in series and snapped together. This series connection method, on the one hand, eliminates the need for connection between large-capacity batteries through wires, saving materials, and on the other hand, increases the contact area of the current collectors between adjacent batteries, reduces the heat generation of the connections between batteries, and improves the safety of the batteries.

Description

Technical Field

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

[0002] Large-capacity lithium batteries are one of the development directions of lithium batteries, and they can be applied to the energy storage field and the power battery field. Compared with small-capacity batteries, large-capacity batteries eliminate the need to equip each battery or battery pack with a set of control devices. In fact, although the cost of a single monomer battery in a large-capacity battery increases, other supporting related devices are greatly reduced, and generally speaking, its cost is reduced, which is conducive to market competition.

[0003] The application of large-capacity energy storage batteries in China is currently in its infancy. The production of large-capacity monomer batteries is restricted by many factors, including high requirements for production equipment, high requirements for product consistency, high product rejection rates, concentrated heat generation during application, and large heat release amounts, etc.

[0004] CN101931098A discloses a square battery, including a housing. A safety valve is provided at the top of the housing. A pole piece and a pole ear are provided inside the housing. The positive and negative electrodes of the pole piece are respectively connected to the positive and negative ends of the pole ear. The other ends of the positive and negative ends of the pole ear are respectively connected to a positive current collector and a negative current collector. The positive current collector and the negative current collector are set as horizontal current collectors, and the positive current collector and the negative current collector are horizontally connected to the positive and negative ends of the pole ear respectively. However, the current collectors of this patent do not directly extend out of the housing, the heat dissipation effect is not good, and multiple batteries cannot be connected in series.

[0005] CN107658489A discloses a fuel cell module that is convenient for installation and disassembly, including a fluid distributor, front and rear baffles, a fuel cell soft package, a battery soft package connection strip, and a bundling band; the fuel cell soft package includes a type-I fuel cell soft package and a type-II fuel cell soft package; after being integrated with the front baffle and the rear baffle respectively, it is fixed with a bundling band; and n fuel cell soft packages are sequentially stacked at intervals of the type-I fuel cell soft package and the type-II fuel cell soft package for series connection, and then a fluid distributor is installed in front of the front baffle; and it is bundled into one body with a bundling band to form a fuel cell module. However, only the electrodes of this patent extend out of the housing, and a good heat dissipation effect cannot be achieved, and the space inside the battery cannot be saved, and the energy density is low; although series connection is achieved, its series connection structure is not stable enough and is not conducive to heat dissipation. Summary of the Invention

[0006] In order to solve the above problems, the present invention discloses an overall structure of a large-capacity battery, and the specific technical solutions are as follows:

[0007] The present invention discloses an overall structure of a large-capacity battery, including at least one battery module. The battery module includes a housing, a cover, a battery cell group, an electrode connecting member, and a current collector. The battery cell group is located inside the housing. Both ends of the electrode connecting member are respectively connected to the tab of the battery cell group and the current collector. The current collector is arranged on both sides outside the housing.

[0008] Further defined, the battery cell group is composed of at least one battery cell. The positive and negative tabs of the battery cell group are located on the same side of the battery cell group and are connected to the electrode connecting member.

[0009] Further defined, multiple groups of through slots are provided on one long side of the electrode connecting member. The positive and negative tabs of the battery cell group pass through the through slots, are vertically bent, and then welded to the electrode connecting member.

[0010] Further defined, the current collector includes a positive current collector and a negative current collector. The electrode connecting member includes a positive connecting member and a negative connecting member. The positive current collector is welded to the positive connecting member extending out of the housing, and the negative current collector is welded to the negative connecting member extending out of the housing.

[0011] Further defined, at least one loop-shaped card slot is provided on the outer side surface of the current collector relative to the housing. The sizes and numbers of the loop-shaped card slots on the positive current collector and the negative current collector are the same, but the directions are opposite, so that the battery modules are connected in series with each other.

[0012] Further defined, the number of loop-shaped card slots on both the positive current collector and the negative current collector is 3. The current collector is an aluminum or copper part formed by one-time extrusion molding.

[0013] Further defined, a plug strip is provided in the gap formed after the battery modules are connected in series by being clamped through the loop-shaped card slots.

[0014] Further defined, the cross-section of the plug strip is rectangular, and the cross-sectional area is greater than or equal to the area of the gap. The plug strip has a taper along the length direction, which is convenient for being inserted into the gap.

[0015] Further defined, the plug strip is a heat pipe structure.

[0016] Further defined, the positive and negative connecting members extend out of the housing through the connection between the housing and the cover, and are insulated and sealed from the housing and the cover through an insulating sealing ring.

[0017] Further defined, multiple openings are provided on the positive and negative connecting members for the sealing bolts to pass through. The diameter of the openings is greater than the rod diameter of the sealing bolts.

[0018] Further limitation: A plurality of openings are provided on the insulating sealing ring for the sealing bolts to pass through. The diameter of the openings is the same as that of the sealing bolts, which serves to insulate the positive and negative connectors and the sealing bolts.

[0019] Further limitation: A downward notch is provided on the part of the positive and negative connectors extending out of the housing, so that the positive and negative connectors extend out of the side of the housing. A flange is provided on the upper part of the housing, and bolt holes are provided on the flange. The diameter of the bolt holes is the same as the rod diameter of the sealing bolts.

[0020] Further limitation: A step is provided on the part of the current collector extending between the flange and the cover body, and an insulating material is filled. An insulating board is provided between the current collector and the housing to prevent the positive and negative current collectors from directly contacting the battery cell housing.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The present invention discloses an overall structure of a large-capacity battery, including at least one battery module. The battery module includes a housing, a cover body, a battery cell group, an electrode connector, and a current collector. The battery cell group is located inside the housing. The electrode connectors are respectively connected to the tabs of the battery cell group and the current collector. The current collectors are arranged on both sides outside the housing. The current collector is the gathering place of the battery heat. By arranging the current collector outside the battery housing, the heat can be dissipated in a timely and effective manner; at the same time, the internal space of the battery is saved, and the energy density of the large-capacity battery is greatly improved.

[0023] 2. The electrode connector is in a flat plate shape, which greatly saves materials; by connecting the electrode and the current collector through the electrode connector, the connection stability can be effectively enhanced, and virtual connection can be prevented.

[0024] 3. One end face of the electrode connector is welded to the tab of the battery cell group, and the other end face is welded to the current collector, which increases the contact area of the electrode connector, the tab, and the current collector, improves the current-carrying capacity, and ensures the safety and stability of the overall structure of the large-capacity battery.

[0025] 4. Adjacent battery modules are snap-connected together through the loop-shaped card slots provided on the current collectors. A plug strip is provided in the gap of the loop-shaped card slots. This connection method is convenient, fast, and has a stable structure, simplifies the complicated connection process, and saves components.

[0026] 5. The plug strip in the gap of the loop-shaped card slot can be a heat pipe structure, which is beneficial to dissipating the heat generated by the current collector in a timely manner while improving the connection stability.

[0027] 6. The positive and negative connectors extend out of the housing through the connection part between the housing and the cover body, and are insulated and sealed from the housing and the cover body through an insulating sealing ring, which strengthens the insulating and sealing effect.

[0028] 7. The housing, the cover body and the electrode connecting member are connected by sealing bolts. The connection method is efficient and simple, and the structural stability is strong.

[0029] 8. A step is provided on the part of the current collector column extending between the flange and the cover body, and an insulating material is filled. An insulating plate is provided between the current collector column and the housing, which can prevent the current collector column from directly contacting the housing and improve the safety of the overall structure of the battery.

[0030] 9. The battery modules can be connected in series through the loop-shaped card slots provided on the current collector columns, which is convenient for designing the number of battery modules to meet the capacity requirements of large batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of the overall structure of the large-capacity battery of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the electrode tab of the battery cell and the positive and negative connection pieces of the present invention;

[0034] Figure 3 It is a schematic diagram of the positive and negative connection pieces of the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of the positive and negative connection pieces and the insulating sealing ring of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure of the battery cell housing of the present invention;

[0037] Figure 6 It is one of the schematic diagrams of the series connection structure of the large-capacity single battery of the present invention;

[0038] Figure 7 It is the second schematic diagram of the series connection structure of the large-capacity single battery of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Among them, 1 is the positive current collector; 2 is the negative current collector; 3 is the housing; 4 is the negative connection member; 5 is the insulating sealing ring; 7 is the positive connection member; 8 is the cover; 9 is the battery cell group; 10 is the positive electrode tab; 11 is the negative electrode tab; 12 is the opening of the positive connection member; 13 / 14 are the tab connection through grooves; 15 is the opening of the negative connection member; 16 is the opening of the negative insulating sealing ring; 17 is the opening of the positive insulating sealing ring; 18 is the housing flange; 19 / 20 are the flange steps of the protruding parts of the positive and negative connection members; 21 is the flange bolt hole; 22 is the insulating board between the housing and the current collector; 23 is the step between the current collector and the flange; 41 is the first single battery; 42 is the second single battery; 43 is the positive current collector of the first single battery; 44 is the negative current collector of the first single battery; 45 is the plug strip; 46 is the positive current collector of the second single battery; 47 is the negative current collector of the second single battery; 31 / 32 / 33 are the upward U-shaped card slots; 71 / 72 / 73 are the downward U-shaped card slots. Detailed implementation manners

[0041] The following further describes the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification.

[0042] It should be understood that terms such as "having", "including", and "comprising" used herein do not preclude the presence or addition of one or more other elements or their combinations.

[0043] It should be understood that directional terms such as "upper" and "lower" used herein are described according to the accompanying drawings of the specification to facilitate a better understanding of the technical solution of the present invention.

[0044] The following details the technical solution of the present invention with reference to the accompanying drawings and specific embodiments.

[0045] The present invention discloses an overall structure of a large-capacity battery, which includes at least one battery module. The battery module includes a housing 3, a cover 8, a battery cell group 9, electrode connectors 4 / 7, and current collectors 1 / 2. The battery cell group 9 is located inside the housing 3. The electrode connectors 4 / 7 are respectively connected to the tabs of the battery cell group 9 and the current collectors 1 / 2. The current collectors 1 / 2 are arranged on both sides outside the housing 3. The battery cell group 9 is composed of at least one battery cell. The positive and negative tabs of the battery cell group 9 are located on the same side of the battery cell group 9 and are connected to the electrode connectors 4 / 7. Multiple sets of through slots 13 / 14 are provided on the long side of one surface of the electrode connectors 4 / 7. The positive and negative tabs of the battery cell group 9 pass through the through slots and are vertically bent and then welded to the electrode connectors 4 / 7. The current collectors include a positive current collector 1 and a negative current collector 2. The electrode connectors include a positive connector 7 and a negative connector 4. The positive current collector 1 is welded to the positive connector 7 extending out of the housing 3, and the negative current collector 2 is welded to the negative connector 4 extending out of the housing 3. At least one loop-shaped card slot is provided on the outer side surface of the current collectors 1 / 2 relative to the housing 3. The sizes and numbers of the loop-shaped card slots on the positive current collector 1 and the negative current collector 2 are the same, but the directions are opposite, so that the battery modules are connected in series with each other. The number of loop-shaped card slots on both the positive current collector 1 and the negative current collector 2 is 3. The current collectors 1 / 2 are aluminum or copper parts formed by one-time extrusion molding. A plug strip 45 is provided in the gap formed after the batteries are connected in series by being clamped by the loop-shaped card slots. The cross section of the plug strip 45 is rectangular, and the cross-sectional area is greater than or equal to the area of the gap. The plug strip 45 has a taper along the length direction, which is convenient for being inserted into the gap. The plug strip 45 is a heat pipe structure. The positive and negative connectors 4 / 7 extend out of the housing 3 through the connection part between the housing 3 and the cover 8, and are insulated and sealed from the housing 3 and the cover 8 through an insulating sealing ring 5. Multiple openings 12 / 15 are provided on the positive and negative connectors 4 / 7 for the sealing bolts to pass through. The diameter of the openings is greater than the rod diameter of the sealing bolts. Multiple openings 16 / 17 are provided on the insulating sealing ring 5 for the sealing bolts to pass through. The diameter of the openings is the same as the diameter of the sealing bolts, which plays a role in insulating the electrode connectors from the sealing bolts. A downward notch is provided on the part of the positive and negative connectors 4 extending out of the housing 3, so that the positive and negative connectors 4 extend out of the side of the housing 3. A flange 18 is provided on the upper part of the housing 3, and bolt holes 21 are provided on the flange. The diameter of the bolt holes 21 is the same as the rod diameter of the sealing bolts. A step 23 is provided on the part of the current collectors 1 / 2 extending between the flange and the cover 8, and an insulating material is filled. An insulating plate 22 is provided between the current collectors and the housing 3 to prevent the current collectors 1 / 2 from directly contacting the housing 3.

[0046] Embodiment 1

[0047] See Figure 1 — Figure 2, this embodiment shows the overall structure of a large-capacity battery, which includes 2 battery modules. The battery module includes a housing 3, a cover 8, a battery cell group 9, electrode connectors 4 / 7, and current collectors 1 / 2. The battery cell group 9 is located inside the housing 3. One end of the electrode connector 4 / 7 is connected to the tab of the battery cell group 9, and the other end is connected to the current collector 1 / 2. The current collectors 1 / 2 are arranged on both sides outside the housing 3.

[0048] It should be noted that the number of battery modules in this embodiment can be 1, 2, 3, 4, or more, and the specific number can be designed according to the capacitance requirements of the large-capacity battery. The technical solution of this embodiment arranges the current collectors 1 / 2 outside the battery housing 3, which can dissipate heat in a timely and effective manner; at the same time, it saves the internal space of the battery and greatly improves the energy density of the large-capacity battery.

[0049] Embodiment 2

[0050] See Figure 1 — Figure 4 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 1, the battery cell group 9 is a stacked battery cell group. The positive tabs 10 and negative tabs 11 of the stacked battery cell group are both located on the same side of the battery cell group 9. The positive tab 10 and the negative tab 11 pass through the through slots 13 / 14 on the positive electrode connector 7 and the negative electrode connector 4 respectively, and are vertically bent on the upper end surface of the electrode connector, and then the positive and negative tabs 10 / 11 are welded to the positive and negative electrode connectors 4 / 7. See Figure 2 , the electrode connector is a flat structure, which is composed of the through slots 13 / 14 on the positive and negative electrode connectors 4 / 7, the bolt holes 12 / 15 of the positive and negative electrode connectors, and the parts of the positive and negative electrode connectors 4 / 7 extending out of the housing 3.

[0051] Preferably, the material of the electrode connectors 4 / 7 is metal, which can be aluminum alloy or pure copper.

[0052] Embodiment 3

[0053] See Figure 1 — Figure 5 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 2, the current collectors are divided into a positive current collector 1 and a negative current collector 2. The positive current collector 1 is welded to the positive electrode connector 7 extending out of the side of the housing 3, and the negative current collector 2 is welded to the negative electrode connector 4 extending out of the side of the housing 3.

[0054] It should be noted that the electrode connecting piece in this embodiment is flat-shaped, which greatly saves materials. By connecting the tab to the current collector through the electrode connecting piece, the connection stability can be effectively enhanced, and virtual connection can be effectively prevented. One end face of the electrode connecting piece 4 / 7 is welded to the tab of the battery cell group, and the other end face is welded to the current collector 1 / 2, increasing the contact area of the electrode connecting piece, the tab, and the current collector, improving the current-carrying capacity, and ensuring the safety and stability of the overall structure of the large-capacity battery.

[0055] Embodiment 4

[0056] See Figure 1 — Figure 7 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 3, the current collector 1 / 2 is provided with a loop-shaped slot 31 / 32 / 33 / 71 / 72 / 73 on the outer side surface of the housing 3. The loop-shaped slots 31 / 32 / 33 / 71 / 72 / 73 are the same in size and number on the positive current collector 1 and the negative current collector 2, but in opposite directions, facilitating the series connection between battery modules.

[0057] Preferably, the number of loop-shaped slots on both the positive current collector 1 and the negative current collector 2 is 3.

[0058] Preferably, the current collector 1 / 2 is an aluminum or copper part formed by one-time extrusion molding.

[0059] Preferably, a plug strip 45 is provided in the gap formed after the battery modules are connected in series by being clamped through the loop-shaped slots 31 / 32 / 33 / 71 / 72 / 73. The cross-section of the plug strip 45 is rectangular, and the cross-sectional area is greater than or equal to the area of the gap. The plug strip 45 has a taper along the length direction, facilitating insertion into the gap.

[0060] Preferably, the plug strip 45 can be a heat pipe structure, facilitating the rapid conduction of the heat generated by the current collector 1 / 2.

[0061] It should be noted that the connection method of the technical solution in this embodiment is convenient, fast, and the structure is stable, simplifying the complicated connection process, saving components, and while improving the connection stability, facilitating the timely dissipation of the heat generated by the current collector 1 / 2.

[0062] Embodiment 5

[0063] This embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 4, the positive and negative electrode connecting pieces 4 / 7 extend out of the housing 3 through the connection between the housing 3 and the cover 8, and are insulated and sealed from the housing 3 and the cover 8 through the insulating sealing ring 5.

[0064] Preferably, the positive and negative electrode connecting pieces 4 / 7 are provided with a plurality of openings 12 / 15 for the sealing bolts to pass through, and the diameter of the openings 12 / 15 is larger than the rod diameter of the sealing bolts.

[0065] Preferably, the insulating sealing ring 5 is provided with a plurality of openings 16 / 17 for the sealing bolts to pass through. The diameter of the openings 16 / 17 is the same as that of the sealing bolts, serving as the insulating electrode connectors and the sealing bolts.

[0066] Preferably, the part of the positive and negative connectors 4 extending out of the housing 3 is provided with a downward notch, so that the positive and negative connectors 4 extend out of the side of the box body. The upper part of the housing 3 is provided with a flange 18, and the flange is provided with bolt holes 21. The diameter of the bolt holes 21 is the same as the rod diameter of the sealing bolts.

[0067] Preferably, the part of the current collector posts 1 / 2 extending between the flange 18 and the cover body 8 is provided with a step 23 and filled with insulating material. An insulating plate 22 is provided between the current collector posts 1 / 2 and the housing 3 to prevent the current collector posts 1 / 2 from directly contacting the housing 3.

[0068] It should be noted that the part of the positive and negative connectors 4 / 7 extending out of the housing 3 is provided with an insulating sealing ring 5. The holes 16 / 17 for passing the bolts are provided at the positions corresponding to the positive and negative connectors 4 / 7 on the insulating sealing ring 5. The diameter of the through holes 12 / 15 for passing the bolts on the positive and negative connectors 4 / 7 provided by the present invention is 2-3 mm larger than the diameter of the corresponding holes 16 / 17 on the insulating sealing ring 5. The diameter of the bolt holes 16 / 17 on the insulating sealing ring 5 is the same as the screw rod diameter of the fixing bolts, so that the fixing screw rod and the positive and negative connectors 4 / 7 are insulated from each other through the insulating sealing ring 5.

[0069] It should be noted that a flange 18 is provided on the upper part of the housing 3, and a downward notch is provided on the part of the positive and negative connectors 4 / 7 extending out of the housing 3, so that after the positive and negative connectors 4 / 7 extend out of the side of the housing 3, the upper edges of the positive and negative connectors 4 / 7 and the insulating sealing ring 5 are basically flush with the flange above the notch of the housing 3. A number of bolt holes are provided on the flanges around the housing 3, and the diameter of the bolt holes is the same as the diameter of the sealing screw rod, so that the fixing screw rod and the positive and negative connectors 4 / 7 can also be insulated from each other through the insulating sealing ring 5. When the battery cell group 9 is placed into the housing 3, the positive and negative connectors 4 / 7 with the insulating sealing ring 5 will be placed into the downward notches on both sides of the housing 3, and the parts above the notches are basically on the same plane. In this embodiment, an O-ring seal is provided on this plane, and the cover body 8, the positive and negative connectors 4 / 7 and the housing 3 are hermetically sealed together at one time through the cover body 8 and the fixed sealing bolts, thus forming a complete battery housing 3.

[0070] It should be noted that a step can be provided on the part of the current collector posts 1 / 2 extending between the current collector post housing flange 18 and the cover body 8 and filled with insulating material to prevent the positive and negative current collector posts 1 / 2 from directly contacting the battery cell housing 3.

[0071] Embodiment 6

[0072] This embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 5, the positive electrode tab 10 and the negative electrode tab 11 of the stacked cell group 9 can be located on two opposite sides of the cell group 9 respectively. The positive electrode tab 10 and the negative electrode tab 11 pass through the through slots 13 / 14 on the positive electrode connecting member 7 and the negative electrode connecting member 4 respectively, and are vertically bent after passing through the through slots 13 / 14 on the positive and negative electrode connecting members 4 / 7, and then the positive and negative electrode tabs 10 / 11 and the positive and negative electrode connecting members 4 / 7 are welded together correspondingly.

[0073] It should be noted that the positive and negative electrode connecting members 4 / 7 corresponding to the cell group 9 in this embodiment are L-shaped structures. The positive and negative electrode connecting members 4 / 7 are composed of the through slots 13 / 14 on the connecting members, the positive and negative electrode connecting member bolt holes 12 / 15, and the parts of the positive and negative electrode connecting members 4 / 7 extending out of the housing 3. The difference from the flat-structured positive and negative electrode connecting members is that they are vertically bent from the middle part between the bolt holes 12 / 15 of the positive and negative electrode connecting members and the through slots 13 / 14 on the positive and negative electrode connecting members to form L-shaped positive and negative electrode connecting members, and other structures remain unchanged.

[0074] Embodiment 7

[0075] See Figure 6 — Figure 7 , this embodiment shows the overall structure of a large-capacity battery. On the basis of Embodiment 5, the battery modules are connected in series in the following manner. The positive current collector posts 43 / 46 and the negative current collector posts 44 / 47 of the single cells 41 / 42 are both arranged on two side surfaces of the battery body. Among them, 3 upward U-shaped card slots 31 / 32 / 33 are arranged on the positive current collector posts 43 / 46, and 3 corresponding downward U-shaped card slots 71 / 72 / 73 are arranged on the negative current collector posts. The sizes and dimensions of the upward U-shaped card slots 31 / 32 / 33 are exactly the same as those of the downward U-shaped card slots 71 / 72 / 73, and their shapes are chiral symmetric.

[0076] When the first single cell 41 and the second single cell 42 are connected in series, the negative current collector post 44 of the first single cell 41 and the positive current collector post 46 of the second single cell 42 are close to each other, and the downward U-shaped card slots 71 / 72 / 73 on the negative current collector post 44 of the first single cell 41 and the upward U-shaped card slots 31 / 32 / 33 on the positive current collector post 46 of the second single cell 42 are nested together, then as Figure 6 shown. Then insert a plug strip 45 as shown in Figure 7 into the gap formed after the nesting of the negative current collector post 44 of the first single cell 41 and the positive current collector post 46 of the second single cell 42, then the single cells 41 / 42 can be connected in series, with a simple structure, convenient operation and strong stability.

[0077] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and is not intended to limit the present invention. For those skilled in the art, without departing from the concept of the present invention, several simple deductions or substitutions can be made. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be regarded as belonging to the patent protection scope determined by the claims submitted for the present invention.

Claims

1. The overall structure of a large-capacity battery, including at least one battery module, is characterized in that The battery module includes a housing, a cover, a battery cell group, electrode connectors, and current collectors. The battery cell group is located inside the housing. The two ends of the electrode connectors are respectively connected to the tabs of the battery cell group and the current collectors. The current collectors are arranged on both sides outside the housing. The current collectors include a positive current collector and a negative current collector. The electrode connectors include a positive electrode connector and a negative electrode connector. The positive current collector is welded to the positive electrode connector extending out of the housing, and the negative current collector is welded to the negative electrode connector extending out of the housing. At least one loop-shaped slot is provided on the outer side surface of the current collector relative to the housing. The loop-shaped slots enable the battery modules to be directly connected in series with each other. A plug strip is provided in the gap between the current collectors formed after the battery modules are connected in series by being clamped through the loop-shaped slots. The plug strip is in a heat pipe structure.

2. The overall structure of the high-capacity battery according to claim 1, characterized in that, The battery cell group is composed of at least one battery cell. The positive and negative tabs of the battery cell group are located on the same side of the battery cell group and are connected to the electrode connectors.

3. The overall structure of the large-capacity battery according to claim 1, characterized in that, Multiple groups of through slots are provided on the long side of one surface of the electrode connectors. The positive and negative tabs of the battery cell group pass through the through slots and are vertically bent and then welded to the electrode connectors.

4. The overall structure of the high-capacity battery according to claim 1, characterized in that, The loop-shaped slots on the positive current collector and the negative current collector are the same in size and number and opposite in direction.

5. The overall structure of the large-capacity battery according to claim 4, characterized in that, The number of loop-shaped slots on both the positive current collector and the negative current collector is 3. The current collectors are aluminum or copper parts formed by one-time extrusion molding.

6. The overall structure of the high-capacity battery according to claim 4, characterized in that, The cross-section of the plug strip is rectangular, and the cross-sectional area is greater than or equal to the area of the gap. The plug strip has a taper along the length direction to facilitate being inserted into the gap.

7. The overall structure of the large-capacity battery according to claim 1, characterized in that, The positive electrode connector and the negative electrode connector extend out of the housing through the connection part between the housing and the cover, and are insulated and sealed from the housing and the cover through an insulating sealing ring.

8. The overall structure of the large-capacity battery according to claim 1, characterized in that, Multiple openings are provided on the positive electrode connector and the negative electrode connector for the sealing bolts to pass through. The diameter of the openings is greater than the rod diameter of the sealing bolts.

9. The overall structure of the large-capacity battery according to claim 7, characterized in that, Multiple openings are provided on the insulating sealing ring for the sealing bolts to pass through. The diameter of the openings is the same as the diameter of the sealing bolts.

10. The overall structure of the large-capacity battery according to claim 8, characterized in that, A downward notch is provided on the part where the positive electrode connector and the negative electrode connector extend out of the housing, so that the sides of the positive and negative electrode connectors extend out of the housing. A flange is provided on the upper part of the housing, and bolt holes are provided on the flange. The diameter of the bolt holes is the same as the rod diameter of the sealing bolts.

11. The overall structure of the high-capacity battery according to claim 10, characterized in that, Steps are provided on the parts where the current collectors extend between the flange and the cover, and insulating materials are filled. An insulating board is provided between the current collectors and the housing to prevent the current collectors from directly contacting the housing.

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