High-power lithium ion storage battery pack for space

Abstract

The invention relates to a high-power lithium ion storage battery pack for space, each small module consists of two end plates, two side plates and a top plate, and is inserted into a groove of a bottom plate to realize structural support; the plurality of storage battery monomers are fixed between the front and rear end plates; the connecting strips are connected with the anodes and the cathodes of the plurality of storage battery monomers through screws, so that the plurality of storage battery monomers are connected in series and in parallel; the confluence copper bar is connected with the connecting bar through a fastener, so that the confluence copper bar is electrically connected with the connecting bar; a plurality of crimping terminals are crimped on the confluence copper bar, so that the confluence copper bar is electrically connected with the crimping terminals; the crimping terminal crimps a plurality of wires, and the wires lead to an electric connector of the storage battery pack to realize power output; and the socket frame is screwed on the front end plate of the small module through a screw, so that the socket frame is connected with the end plate, and a gap between the lower part of the socket frame and the end plate is used for the distribution of a bus copper bar, a crimping terminal and a wire. According to the invention, the small heating value design under continuous high-power output of the storage battery pack for the space is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery design, and relates to a high-power lithium-ion battery pack for space use. Background Art

[0002] Lithium-ion batteries for space use require the battery pack to have a design structure with high-power output. The battery must have extremely high current-carrying capacity, and it is necessary to reduce the heat generation when the battery pack outputs high power continuously, so that the battery pack can work stably for a long time.

[0003] At present, all lithium-ion batteries for space use adopt single batteries connected in series and parallel to form a battery pack, and realize the power connection design by means of wire crimping terminals connected to the single batteries. Due to its binding and fixing method, it is difficult for the battery to meet the low heat generation requirement under continuous high-power discharge, so it is difficult to realize space application. Summary of the Invention

[0004] The technical problem solved by this application is: overcoming the deficiencies of the prior art, providing a high-power lithium-ion battery pack for space use, solving the problem of large heat generation when the battery pack with wire connection form outputs high power continuously, and realizing the space application of high-power lithium-ion batteries.

[0005] Based on the problem that it is difficult for the battery to meet the low heat generation requirement under continuous high-power discharge, it is necessary to design a structure of a high-power battery pack to solve the problem of large heat generation when the battery with wire connection form outputs high power continuously through the high-current connection design of the battery pack, and realize the space application of high-power lithium-ion batteries.

[0006] The technical solution provided by this application is as follows:

[0007] A high-power lithium-ion battery pack for space use includes a bottom plate and a plurality of small modules installed on the bottom plate;

[0008] Each small module includes side plates, end plates and battery monomers. Two relatively arranged side plates and two relatively arranged end plates are fixedly connected in sequence to form a frame member, and a plurality of battery monomers are installed in the frame member and are fixedly arranged between the two relatively arranged end plates in sequence;

[0009] A plurality of grooves arranged in a straight line direction are provided on the bottom plate; one open end of each frame member is inserted into a groove on the bottom plate, and the positive and negative electrodes of the battery monomers are both located at the other open end of the frame member;

[0010] Between the positive and negative electrodes of each battery cell, multiple battery cells are connected in series and parallel through connection bars; the connection bars are electrically connected to the busbar copper bars, and the busbar copper bars are fixedly connected to the end plates and side plates; the busbar copper bars are electrically connected to crimp terminals, the crimp terminals crimp wires, and the wires are connected to electrical connectors; a socket holder is connected to the end plate at the same end of the small module, and the electrical connector is connected to the socket holder.

[0011] Further, each small module further includes a top plate, and the top plate is connected between two opposite end plates; there is a gap between the top plate and the connection bar connected to the end of the battery cell.

[0012] Further, one end of the end plate far from the bottom plate is higher than the side plate, and the part where the end plate is higher than the side plate is a hollow structure; the top plate and the end plate are connected by screws; the top plate is connected with support studs, and the support studs pass through the top plate and the support column in sequence, and then are threadedly connected to the side plate.

[0013] Further, lugs are connected to the outer sides of both the end plate and the side plate, and bolts pass through the lugs and are threadedly connected to the bottom plate; a pressure strip is provided on the side of the lug connected to the end plate away from the bottom plate, and the secondary fixing screws pass through the pressure strip, the lug connected to the end plate in sequence and are threadedly connected to the bottom plate, and the fixing screws pass through the pressure strip and are threadedly connected to the bottom plate.

[0014] Further, a high thermal conductivity foam carbon is evenly coated on the surface of the end plate close to the battery cell, and a high thermal conductivity foam carbon is coated between adjacent battery cells.

[0015] Further, two busbar copper bars are provided, and the two busbar copper bars are connected to the side plates on the outside of the outermost small module, and the same ends of the two busbar copper bars are bent and extend along the direction parallel to the end plate, so that the busbar copper bars are located on the side of the socket holder facing the bottom plate.

[0016] Further, a polyimide tape is pasted on the outside of the busbar copper bar, and a heat shrinkable film is sleeved outside the polyimide tape; a fixing frame is installed on the end plate and the side plate, and the fixing frame is used to fix the busbar copper bar, and the fixing frame 16 is made of polyimide or epoxy glass laminate material; a protective cover is installed on the side plate on the outside of the outermost small module, and the protective cover covers the outside of the busbar copper bar, and the protective cover is made of insulating material.

[0017] Further, a high thermal conductivity foam carbon is evenly coated in the groove of the bottom plate.

[0018] Further, a heat sink is pasted on the end of each battery cell facing the groove.

[0019] Further, the end plate, the side plate, the bottom plate and the top plate are made of aluminum alloy or magnesium alloy materials; the socket holder is made of stainless steel or aluminum alloy materials; the connection bar is made of nickel material; the busbar copper bar is made of copper material.

[0020] The beneficial effects of the present invention compared with the prior art are as follows:

[0021] Compared with the prior art, the present invention can form a high-power lithium-ion battery pack by using battery monomers, connection bars, busbar copper bars, bottom plates, end plates, side plates, top plates, crimp terminals, wires, electrical connectors, socket racks, etc. It has a light structure, a compact layout, simple processing, few types of components, easy assembly, good maintainability, and little heat generation during continuous high-power output. It is especially suitable for space vehicles with high-power discharge requirements such as SAR satellites. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 is a structural diagram of the high-power battery pack according to an embodiment of the present invention.

[0023] Attached Figure 2 is a side view of the high-power battery pack according to an embodiment of the present invention.

[0024] Attached Figure 3 is a partial enlarged view of the high-power battery pack according to an embodiment of the present invention.

[0025] Attached Figure 4 is a schematic electrical connection diagram of the high-power battery pack according to an embodiment of the present invention.

[0026] Attached Figure 5 is a graph of the temperature change during high-power discharge of the high-power battery pack according to an embodiment of the present invention.

[0027] Wherein: 1 - end plate; 2 - top plate; 3 - bottom plate; 4 - busbar copper bar; 5 - battery monomer; 6 - electrical connector; 7 - socket rack; 8 - side plate; 9 - connection bar; 10 - mounting hole; 11 - nut; 12 - spring washer; 13 - flat washer; 14 - crimp terminal; 15 - wire; 16 - fixing bracket; 17 - protective cover; 18 - heat sink; 19 - pressing strip; 20 - fixing strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe in detail the disclosed embodiments of the present application with reference to the drawings.

[0029] An embodiment of the present application discloses a high-power lithium-ion battery pack for space use, as Figures 1 to 4 shown, including battery monomer 5, connection bar 9, bottom plate 3, busbar copper bar 4, side plate 8, end plate 1, top plate 2, crimp terminal 14, wire 15, electrical connector 6, socket rack 7, and heat sink 18.

[0030] As Figure 1 and Figure 2As shown, each small module is composed of 2 end plates 1, 2 side plates 8 and 1 top plate 2. Two relatively arranged side plates 8 and two relatively arranged end plates 1 are fixedly connected in sequence to form a frame-shaped member with openings at both ends. A plurality of battery monomers 5 are installed in the frame-shaped member and are fixedly arranged between the two relatively arranged end plates 1 in sequence; a plurality of grooves arranged in a straight line are provided on the bottom plate 3. One open end of each frame-shaped member is inserted into one groove of the bottom plate 3. The positive and negative electrodes of the battery monomer 5 are both located at the other open end of the frame-shaped member, so that the battery monomers 5 of each small module are inserted into the grooves of the bottom plate 3 to achieve structural support, and there is a gap between adjacent small modules; lugs are connected to the outer sides of the end plates 1 and the side plates 8, and bolts pass through the lugs and are threadedly connected to the bottom plate 3 to achieve the primary fixation of the bottom plate 3 and the small module. Then, a pressing strip 19 is pressed on the lugs connected to the end plates 1, and secondary fixing screws sequentially pass through the pressing strip 19, the lugs connected to the end plates 1 and are threadedly connected to the bottom plate 3, and the fixing screws pass through the pressing strip 19 and are threadedly connected to the bottom plate 3 to achieve the secondary fixation of the bottom plate 3 and the small module. A fixing strip 20 is fixedly connected between adjacent small modules, and the fixing strip 20 is connected between the same-side end plates 1 of adjacent small modules.

[0031] One end of the end plate 1 away from the bottom plate 3 is higher than the side plate 8, and the part of the end plate 1 higher than the side plate 8 is a hollow structure. The top plate 2 is connected to the end plate 1 by screws; the top plate 2 is connected with support studs, and the support studs sequentially pass through the top plate 2 and the support column and are then threadedly connected to the side plate 8.

[0032] The fixing method between the plurality of battery monomers 5 and the front and rear end plates 1 is as follows: high thermal conductivity foam carbon is evenly coated on the surfaces of the front and rear end plates 1 close to the battery monomers 5, and high thermal conductivity foam carbon is coated between adjacent battery monomers 5. Then, the front and rear end plates 1 are installed at both ends of the plurality of battery monomers 5 arranged in sequence, and then the 2 side plates 8 are fixedly connected to the end plates 1. The two end plates 1 clamp the plurality of battery monomers 5 to form a small module; then the small module as a whole is connected to the bottom plate.

[0033] The connecting strip 9 is connected to the positive and negative electrodes of the plurality of battery monomers 5 by screws to realize the series-parallel connection of the plurality of battery monomers 5.

[0034] The busbar copper strip 4 is L-shaped. There are two busbar copper strips 4 in total. One side of the two busbar copper strips 4 is respectively connected to the side plate 8 on the outside of the outermost small module, and the other side of the busbar copper strip 4 is located at the same end of the small module. The busbar copper strip 4 is connected to the connecting strip 9 through a fastener to realize the electrical connection between the busbar copper strip 4 and the connecting strip 9; a plurality of crimping terminals 14 are crimped on the busbar copper strip 4 to realize the electrical connection between the busbar copper strip 4 and the crimping terminals 14; a plurality of wires 15 are crimped on the crimping terminals 14, and the wires lead to the electrical connector 6 of the battery pack to realize power output;

[0035] The socket holder 7 is screwed to the front panel 1 at the same end of multiple small modules through screws, realizing the connection between the socket holder 7 and the front panel 1, and ensuring that the gap between the lower part of the socket holder 7 and the front panel 1 is used for the distribution of the busbar 4, the crimping terminal 14 and the wire 15.

[0036] The battery cell 5, the crimping terminal 14, the busbar 4 and the socket holder 7 are mechanically connected by screws.

[0037] For the high-power lithium-ion battery pack in the said space, fixing brackets 16 can also be arranged on the front panel 1 and the side panel 8 for fixing the busbar 4. The fixing bracket 16 is made of polyimide or epoxy glass laminate material, playing an insulating role. At the same time, the busbar 4 is first pasted with polyimide tape and then sleeved with a heat shrinkable film, and the connection position with the connection bar 9 is reserved during this process; the insulation of the busbar 4 is completed.

[0038] The battery cell 5 is a square battery cell, such as an INP lithium-ion battery cell or an ITP lithium-ion battery cell, etc.

[0039] The front panel 1, the side panel 8, the bottom plate 3 and the top plate 2 are made of aluminum alloy or magnesium alloy materials.

[0040] The socket holder 7 is made of stainless steel or aluminum alloy materials.

[0041] The connection bar 9 is made of nickel material.

[0042] The busbar 4 and the heat sink 18 are made of copper materials.

[0043] The protective cover 17 is made of insulating material, which can realize the insulation protection of the busbar 4.

[0044] The lithium-ion battery pack of the present application is used in a vacuum environment. With the above structural settings, the heat generated by it can have better heat dissipation through heat transfer and heat radiation.

[0045] The present invention will be further described below with reference to the drawings and embodiments.

[0046] Embodiment 1

[0047] As Figure 4 shown, 24 battery cells 5 with the same shape and size can be installed between the front and rear front panels 1 and the left and right side panels 8 of the battery pack in this embodiment to form a small module. Each battery cell 5 is pasted with a heat sink 18. The bottom plate 3 has 4 grooves with the same size, and high thermal conductivity foam carbon is evenly smeared in the grooves. The small module is embedded in the grooves for mechanical fixation. According to the power requirement of the aircraft, the size of the bottom plate 3 and the number of grooves can be changed, and the sizes of the front panel 1, the top plate 2, the side panel 8, the busbar 4, the connection bar 9, the heat sink 18 and the number of battery cells 5 can be correspondingly changed for battery packs with different series-parallel configurations.

[0048] The front and rear end plates 1 of the battery pack have the same shape and size, and the left and right side plates 8 have the same shape and size. The front and rear end plates 1 and the left and right side plates 8 are fixedly connected by screws. A highly thermally conductive foam carbon is evenly applied to the surface of the front and rear end plates 1 close to the battery cells 5, and is adhesively bonded and mechanically pressed with the battery cells 5. There are threaded holes at the tops of the front and rear end plates 1 and the left and right side plates 8 for installing and fixing the top plate 2, which can be adjusted according to the needs of the battery pack. The battery cells 5, end plates 1, side plates 8, and top plate 2 are mechanically connected by screws.

[0049] The battery cells 5 in the battery pack are connected to the connection bars 9 by screwing. The connection bars 9 and the crimp terminals 14 are reliably electrically connected through nuts 11, spring washers 12, and flat washers 13. A number of wires 15 are crimped on the crimp terminals 14 and lead to the electrical connector 6 to achieve functions such as power output. The electrical connector 6 of the battery pack is installed on the socket holder 7.

[0050] As Figures 1 to 4 shown, the fixing frame 16 can be first fastened to the side plate 8 with screws; then the busbar copper strip 4 is embedded in the groove of the fixing frame 16 and fastened to the fixing frame 16 and the side plate 8 with screws; then one side of the connection bar 9 is fastened to the positive and negative electrodes of the corresponding battery cell 5 by screwing, and the other side is fastened to the busbar copper strip 4; the crimp terminal 14 with the wire 15 crimped is fixed to the busbar copper strip 4 with the nut 11, spring washer 12, and flat washer 13; then the wire 15 of the crimp terminal 14 is installed on the electrical connector 6; then the electrical connector 6 is installed on the socket holder 7; then the socket holder 7 is fastened to the end plate 1 with screws; finally, the protective cover is fastened to the fixing frame 16 with screws.

[0051] Attached Figure 5 is the temperature change curve of the high-power lithium-ion battery pack for space use assembled by the present invention under a 500A current discharge.

[0052] In summary, as Figure 2 and Figure 3 shown, the high-power lithium-ion battery pack for space use of the present invention has the following characteristics:

[0053] 1) The high-power lithium-ion battery pack has higher adaptability to space vehicles with high-power discharge requirements such as SAR satellites, better stability under continuous large-current discharge, and better thermal performance than the traditional designed battery pack.

[0054] 2) The structure is simple. For the high-power lithium-ion battery pack, the main structural framework only includes components such as the end plates 1, top plate 2, side plates 8, and bottom plate 3. They are connected to each other through grooves and screws, with high mechanical strength. The structure is light, compact, with high mass energy density and volume energy density, meeting the lightweight design requirements of the aircraft. And the assembly is simple, suitable for mass production.

[0055] 3) Good maintainability. The high-power lithium-ion battery pack has a simple structure, and all its components are designed for generalization. Whether a battery cell 5 is damaged or its performance deteriorates, or components need to be replaced, the screws of the end plate 1, top plate 2, side plate 8 and bottom plate 3 can be removed, and then the cell or component can be replaced and reinstalled. Disassembly and reinstallation are greatly simplified, with good maintainability and lower time and labor costs for rework and repair.

[0056] 4) High installation accuracy. The installation holes 10 of the high-power lithium-ion battery pack are located on the bottom plate 3. The installation dimensions and the positions of the installation holes 10 are determined by the bottom plate 3 and can be ensured by machining the components, with controllable accuracy of the installation dimensions. The fixing screws pass through the pressure strip 19 and are threadedly connected to the installation holes 10 of the bottom plate 3.

[0057] 5) Good heat dissipation performance. A heat sink 18 is pasted at the bottom of each battery cell 5 of the high-power lithium-ion battery pack. High thermal conductivity foam carbon is evenly applied between the heat sink 18 and the bottom plate 3. The heat generated by the battery pack under high-power discharge can be quickly transferred to the aircraft cabin plate for heat dissipation, and the temperature between the cells has good uniformity.

[0058] The content not described in detail in this application specification belongs to the well-known technology of those skilled in the art.

[0059] The above has described this application in detail in combination with specific embodiments and exemplary examples. However, these descriptions should not be construed as limitations on this application. Those skilled in the art understand that without departing from the spirit and scope of this application, various equivalent replacements, modifications or improvements can be made to the technical solutions and their implementation manners of this application, and all of these fall within the scope of this application. The protection scope of this application is subject to the appended claims.

Claims

1. A high-power lithium-ion battery pack for space, characterized in that: It includes a bottom plate (3) and multiple small modules mounted on the bottom plate (3); Each small module includes side plates (8), end plates (1) and battery cells (5). Two relatively arranged side plates (8) and two relatively arranged end plates (1) are fixedly connected in sequence to form a frame-shaped member. Multiple battery cells (5) are installed in the frame-shaped member and are fixedly arranged between the two relatively arranged end plates (1) in sequence; Multiple grooves arranged in a straight line are provided on the bottom plate (3); One open end of each frame-shaped member is inserted into a groove of the bottom plate (3), and the positive and negative electrodes of the battery cell (5) are both located at the other open end of the frame-shaped member; Between the positive and negative electrodes of the battery cell (5), a connection bar (9) is used to realize the series-parallel connection of multiple battery cells (5); The connection bar (9) is electrically connected to a busbar copper strip (4), and the busbar copper strip (4) is fixedly connected to the end plate (1) and the side plate (8); The busbar copper strip (4) is electrically connected to a crimp terminal (14), the crimp terminal (14) crimps a wire (15), and the wire (15) is connected to an electrical connector (6); A socket holder (7) is connected to the end plate (1) at the same end of the small module, and the electrical connector (6) is connected to the socket holder (7).

2. The high-power lithium-ion battery pack for space according to claim 1, wherein: Each small module further includes a top plate (2), and the top plate (2) is connected between the two relatively arranged end plates (1); There is a gap between the top plate (2) and the connection bar (9) connected to the end of the battery cell (5).

3. The high-power lithium-ion battery pack for space according to claim 2, wherein: One end of the end plate (1) far from the bottom plate (3) is higher than the side plate (8), and the part where the end plate (1) is higher than the side plate (8) is a hollow structure; The top plate (2) is connected to the end plate (1) by screws; The top plate (2) is connected with support studs, and the support studs pass through the top plate (2) and the support columns in sequence, and then are threadedly connected to the side plate (8).

4. A high-power lithium-ion battery pack for space use according to claim 1, characterized in that: Lugs are connected to the outer sides of the end plate (1) and the side plate (8), and bolts pass through the lugs and are threadedly connected to the bottom plate (3); A pressure strip (19) is provided on the side of the lug connected to the end plate (1) away from the bottom plate (3), and secondary fixing screws pass through the pressure strip (19), the lug connected to the end plate (1) in sequence and are threadedly connected to the bottom plate (3), and fixing screws pass through the pressure strip (19) and are threadedly connected to the bottom plate (3).

5. A high-power lithium-ion battery pack for space use according to claim 1, characterized in that: A high thermal conductivity foam carbon is evenly coated on the surface of the end plate (1) close to the battery cell (5), and high thermal conductivity foam carbon is coated between adjacent battery cells (5).

6. The high-power lithium-ion battery pack for space according to claim 1, wherein: Two busbar copper strips (4) are provided, and the two busbar copper strips (4) are connected to the side plates (8) on the outside of the outermost small module, and the same end of the two busbar copper strips (4) is bent and extends along the direction parallel to the end plate (1), so that the busbar copper strip (4) is located on the side of the socket holder (7) facing the bottom plate (3).

7. A high-power lithium-ion battery pack for space according to claim 1, characterized in that: A polyimide tape is pasted outside the busbar copper strip (4), and a heat shrinkable film is sleeved outside the polyimide tape; a fixing frame (16) is installed on the end plate (1) and the side plate (8), and the fixing frame (16) is used for fixing the busbar copper strip (4). The fixing frame 16 is made of polyimide or epoxy glass laminate material; a protective cover (17) is installed on the side plate (8) outside the outermost small module, and the protective cover (17) covers the outside of the busbar copper strip (4). The protective cover (17) is made of insulating material.

8. A high-power lithium-ion battery pack for space use according to claim 1, characterized in that: High thermal conductivity foam carbon is evenly applied in the groove of the bottom plate (3).

9. A high-power lithium-ion battery pack for space according to claim 8, characterized in that: A heat sink (18) is pasted at the end of each battery cell (5) facing the groove.

10. A high-power lithium-ion battery pack for space use according to claim 1, characterized in that: The end plate (1), the side plate (8), the bottom plate (3) and the top plate (2) are made of aluminum alloy or magnesium alloy materials; the socket holder (7) is made of stainless steel or aluminum alloy materials; the connecting strip (9) is made of nickel material; the busbar copper strip (4) is made of copper material.

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