Square-shell battery cell storage battery pack for space and assembly method

Abstract

The invention discloses a square-shell battery cell storage battery pack for space and an assembly method, and belongs to the technical field of energy storage batteries for spaceflight, the square-shell battery cell storage battery pack comprises a battery cell group, a constraint assembly and an electrical assembly, the battery cell group comprises a plurality of square-shell battery cell monomers, the plurality of square-shell battery cell monomers are connected in series, and the constraint assembly comprises end plates arranged on two sides of the battery cell group in the thickness direction; the end plates are arranged on two sides of the battery cell group in the length direction, the surrounding plates are matched with the end plates to fix the battery cell group, the pressing plate is arranged at the top of the battery cell group and is locked with the end plates, and cushions are arranged between two adjacent battery cells and between the battery cell group and the end plates; the electrical assembly comprises a power bus and heating sheets which are respectively arranged on two sides of the battery cell group in the length direction, the power bus is formed by cold pressing a plurality of leads through a copper nose, and the power bus is connected to the battery cell tabs. According to the invention, the technical effects of capacity limitation, cumbersome volume and out-of-control expansion of the battery cell in space application are achieved, and reliability and environmental adaptability are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aerospace energy storage batteries, and in particular relates to a space-use square-shell battery pack and an assembly method thereof. Background Art

[0002] As the core energy storage unit of a space satellite's power system, lithium-ion batteries provide stable power support for various onboard loads after satellite separation and during in-orbit operation. In existing technologies, space lithium-ion battery packs are mostly constructed using cylindrical cells connected in series and parallel. To meet high power demands, a large number of cells must be stacked, resulting in bulky size, increased weight, and high costs, posing significant reliability risks. During the charge and discharge process, lithium-ion cells expand in volume due to the insertion or removal of lithium ions. Long-term expansion can easily cause cell deformation, poor contact, and even leakage, severely impacting lifespan and safety. They are also unable to withstand high-intensity vibration and impact loads, and can easily lead to cell displacement or connection failure.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to avoid capacity limitation, bulky volume and uncontrolled expansion of battery cells in space applications, and how to improve reliability and environmental adaptability.

[0005] In order to solve the above technical problems, the present invention provides a square shell battery pack for space use, which includes a battery group, a constraint assembly and an electrical assembly. The battery group includes multiple square shell battery cells, and multiple square shell battery cells are connected in series. The constraint assembly includes end plates arranged on both sides of the thickness direction of the battery group, and enclosures arranged on both sides of the length direction of the battery group. The enclosures cooperate with the end plates to fix the battery group. A pressure plate is arranged on the top of the battery group and locked with the end plates. A buffer pad is installed between two adjacent battery cells and between the battery group and the end plates; the electrical assembly includes a power bus and a heating plate installed on both sides of the length direction of the battery group. The power bus is formed by cold pressing multiple wires through a copper nose, and the power bus is connected to the battery cell ears.

[0006] Optionally, the buffer pad is made of elastic insulating material.

[0007] Optionally, the buffer pad is configured so that when subjected to pressure perpendicular to a thickness direction of the buffer pad, a ratio of a compressed thickness of the buffer pad after deformation to an original thickness of the buffer pad is 45% to 55%.

[0008] Optionally, the pressure plate is covered with a cover plate, a power wiring harness and a connector are respectively installed on the cover plate, and the cover plate is locked with the enclosure plate.

[0009] Optionally, a PCB circuit board is mounted on the pressing plate, and the PCB circuit board is connected to the positive and negative electrodes of the battery cell.

[0010] According to another aspect of the present invention, the present invention also provides a method for assembling a square shell battery pack for space use, the method comprising connecting a plurality of square shell battery cells in series into a battery group, and installing buffer pads between adjacent square shell battery cells; installing end plates on both sides of the battery group in the thickness direction, and installing buffer pads between both sides of the battery group in the thickness direction and the end plates, and applying pre-pressure to the battery group according to a preset pressure value to restrain the expansion of the battery group in the thickness direction; installing a surrounding plate on both sides of the battery group in the length direction, and installing a pressure plate on the top of the battery group, and locking the pressure plate and the end plate to restrain the displacement of the battery group in the vertical direction; cold-pressing a plurality of wires into a power busbar through a copper nose, and the power busbar is connected to the battery cell tabs; installing a heating plate on both sides of the battery group in the length direction, and the heating plate is located between the surrounding plate and the battery group.

[0011] Optionally, the capacity of the square shell battery cell is 20 to 500Ah, and when the standard charge and discharge rate of the square shell battery cell is 1C, the corresponding charge and discharge current of the square shell battery cell is 58A, and when the short-time discharge rate of the square shell battery cell is 4C, the corresponding discharge current of the square shell battery cell is 232A.

[0012] Optionally, the preset pressure value is greater than or equal to 3000N.

[0013] Optionally, the method for assembling a space-use square-shell battery pack further includes covering the outer side of the pressure plate with a cover plate, integrating a power harness and a connector on the cover plate, and locking the cover plate to the enclosure plate.

[0014] Optionally, a PCB circuit board is mounted on the pressing plate, and the PCB circuit board is connected to the positive and negative electrodes of the battery cell.

[0015] Beneficial effects:

[0016] The present invention provides a space-use prismatic battery pack. The pack comprises multiple prismatic cells connected in series. End plates are positioned on either side of the cell pack's thickness, and enclosures are positioned on either side of the cell pack's length. The enclosures and end plates cooperate to secure the cell pack. A pressure plate is positioned at the top of the cell pack and locked to the end plates. Buffer pads are installed between adjacent cells and between the cell pack and the end plates. The power busbars in the electrical assembly are cold-pressed from multiple conductors through copper lugs. The power busbars are connected to the cell tabs, and heating plates are installed on either side of the cell pack's length. By connecting high-rate, high-capacity prismatic cells in series and installing buffer pads, a compact battery pack is formed with sufficient expansion space. End plates are installed on both sides of the cell pack's thickness and apply preload, effectively restraining cell expansion during charging and discharging, preventing structural failure caused by expansion. The installation of the enclosures and pressure plates enhances the cell pack's structural stability in both length and vertical directions, improving its reliability in complex space environments. The cold-pressed production and connection of the power busbar reduces welding steps, improving assembly efficiency and busbar reliability. The installation of a heater not only simplifies the assembly process but also improves heating efficiency, enabling the battery pack to function properly in low-temperature environments. This avoids the capacity limitations, bulkiness, and uncontrolled expansion of battery cells in space applications, thereby improving reliability and environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of a square-shell battery pack for space use provided by an embodiment of the present invention.

[0019] Figure 2 This is a schematic structural diagram of a middle end plate of a space-use square-shell battery pack provided by an embodiment of the present invention.

[0020] Figure 3 This is a schematic structural diagram of a center panel of a space-use square-shell battery pack provided by an embodiment of the present invention.

[0021] Figure 4 This is a schematic structural diagram of a cover plate in a space-use square-shell battery pack provided by an embodiment of the present invention.

[0022] Figure 5 A flow chart of a method for assembling a space-use square-shell battery pack provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0024] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0025] In the embodiments of this application, "at least one" refers to one or more; "a plurality" refers to two or more. In the description of this application, the terms "first," "second," "third," etc. are used only for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0026] References to "one embodiment" or "some embodiments" described in this specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, in this specification, the terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0027] It should be pointed out that, in the embodiment of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. At the same time, "connection" in the embodiment of the present application can also be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, A and B are connected, which can be either A and B directly connected, or A and B indirectly connected through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.

[0028] A space-use square-shell battery pack provided by the first embodiment of the present invention is available for reference. Figures 1 to 4 As shown, Figure 1 This is a schematic structural diagram of a space-use square-shell battery pack provided by an embodiment of the present invention. Figure 2 This is a schematic structural diagram of a middle end plate of a space-use square-shell battery pack provided by an embodiment of the present invention. Figure 3 This is a schematic structural diagram of a center panel of a space-use square-shell battery pack provided by an embodiment of the present invention. Figure 4 The present invention provides a schematic structural diagram of a cover plate in a space-use square-shell battery pack. A space-use square shell battery pack provided by an embodiment of the present invention is manufactured by the following space-use square shell battery pack assembly method, wherein the space-use square shell battery pack includes a battery cell group 1, a constraint component and an electrical component, the battery cell group 1 includes multiple square shell battery cell monomers, and the multiple square shell battery cell monomers are connected in series, the constraint component includes an end plate 2, a surrounding plate 3, a pressure plate and a buffer pad, the end plate 2 is arranged on both sides of the thickness direction of the battery cell group 1, the surrounding plate 3 is arranged on both sides of the length direction of the battery cell group 1, the surrounding plate 3 cooperates with the end plate 2 to fix the battery cell group 1, the pressure plate is arranged on the top of the battery cell group 1, and the pressure plate and the end plate 2 are locked with each other, and buffer pads are arranged between two adjacent battery cells and between the battery cell group 1 and the end plate 2, the electrical component includes a power bus and a heating plate, the power bus is formed by cold pressing multiple wires through a copper nose, the power bus is connected to the battery cell ear, and the heating plates are respectively installed on both sides of the length direction of the battery cell group 1.

[0029] The battery pack 1 consists of multiple high-rate, high-capacity prismatic cells connected in series to improve the overall battery pack performance. Buffer pads are installed between the cells and between the cells and the end plates 2. These pads compensate for cell thickness tolerances, provide insulation between the cells, and allow for expansion and contraction during charge and discharge.

[0030] The end plates 2 are located on either side of the cell group 1 in the thickness direction, applying preload to the cell group 1 through mechanical extrusion to effectively restrain expansion of the cells during charging and discharging. The enclosures 3 are located on either side of the cell group 1 in the length direction and fit tightly with the end plates 2 to secure the cell group 1 in all directions, preventing expansion during charging and discharging and damaging the enclosures 3 or the cell group 1.

[0031] Among them, the pressure plate is arranged on the top of the battery cell group 1 and is locked with the end plate 2. The pressure plate not only enhances the structural stability of the battery cell group 1 in the vertical direction, but also provides installation space for the PCB circuit board. The power busbar is made of multiple wires cold-pressed through copper noses. This production method can reduce the process of welding multiple wires, improve assembly efficiency and busbar reliability. The power busbar is connected to the battery cell tabs and can transmit the electrical energy generated by the battery cell to the external load. The heating plate is installed on both sides of the length direction of the battery cell group 1, which will not only simplify the assembly process, but also help to improve the heating efficiency. The heating plate can provide the necessary heating for the battery cell group 1 in a low temperature environment, so that the battery cell group 1 can still work normally in a low temperature environment.

[0032] In this embodiment, a plurality of the square shell battery cells in the battery cell group 1 are connected in series, and the end plates 2 in the constraint assembly are arranged on both sides of the thickness direction of the battery cell group 1, and the enclosure 3 is arranged on both sides of the length direction of the battery cell group 1. The enclosure 3 cooperates with the end plates 2 to fix the battery cell group 1, and the pressure plate is arranged on the top of the battery cell group 1 and locked with the end plate 2. The buffer pad is installed between two adjacent battery cells and between the battery cell group 1 and the end plate 2. The power bus in the electrical assembly is formed by cold pressing multiple wires through copper noses. The power bus is connected to the battery cell tabs, and the heating plate is installed on both sides of the length direction of the battery cell group 1. In this way, by connecting high-rate and large-capacity square shell battery cells in series and installing buffer pads, a battery cell group 1 with a compact structure and a certain expansion space is formed. The end plates 2 are installed on both sides of the thickness direction of the battery cell group 1 and pre-pressure is applied, which effectively restrains the expansion of the battery cell during the charging and discharging process and prevents structural failure caused by expansion. The installation of the enclosure 3 and the pressure plate enhances the structural stability of the cell group 1 in both length and vertical directions, improving its reliability in complex space environments. The cold-pressed production and connection of the power busbar reduces welding steps, improving assembly efficiency and busbar reliability. The installation of the heater plate not only simplifies the assembly process but also improves heating efficiency, enabling the cell group 1 to function properly in low-temperature environments. This avoids capacity limitations, bulky size, and uncontrolled expansion of the battery cells in space applications, achieving the technical effect of improving reliability and environmental adaptability.

[0033] As an embodiment, the buffer pad is made of an elastic insulating material, such as a composite structural material of silicone-coated cotton. By using a buffer pad made of an elastic insulating material, the buffer pad can be deformed when subjected to pressure perpendicular to the thickness direction of the buffer pad. This deformation not only provides the necessary expansion space for the battery cell, but also exerts a certain restraining force on the battery cell through the elastic restoring force of the buffer pad, effectively preventing the battery cell from excessive expansion during the charging and discharging process. At the same time, the use of elastic insulating materials is also beneficial to improving the insulation performance between battery cells, thereby improving the safety of the battery pack. By combining the buffer pad with the end plates 2 installed on both sides of the battery cell group 1 and the method of applying pre-pressure, the expansion of the battery cell during the charging and discharging process is effectively restrained, preventing structural failure caused by expansion, and helping to improve the reliability and environmental adaptability of the battery pack.

[0034] In some embodiments, the cushion is configured so that when subjected to pressure perpendicular to its thickness, the ratio of its compressed thickness to its original thickness is 45% to 55%. This allows the cushion to deform moderately when subjected to pressure, providing the necessary expansion space for the battery cell while ensuring the cushion's own structural stability and elastic resilience. This facilitates uniform expansion and contraction of the battery cell during charging and discharging, preventing structural failure caused by uneven cell expansion. Furthermore, the cushion's elastic resilience also helps maintain the preload on the battery cell assembly 1 in the thickness direction.

[0035] In some embodiments, the pressure plate is covered with a cover plate 4, on which power wiring harnesses and connectors are respectively installed, and the cover plate 4 is locked with the enclosure 3. A PCB circuit board is installed on the pressure plate, and the PCB circuit board is electrically connected to the power wiring harness. Covering the pressure plate with the cover plate 4, and installing power wiring harnesses and connectors on the cover plate 4, while locking the cover plate 4 with the enclosure 3, is conducive to enhancing the structural stability of the battery pack in the length and vertical direction. The PCB circuit board installed on the pressure plate is connected to the positive and negative poles of the battery cell to achieve connection and control of the battery cell with the external circuit. The PCB circuit board can also be connected to a temperature sensor to monitor the temperature around the battery cell, which not only helps to simplify the assembly process, but also helps to improve the integration and reliability of the battery pack.

[0036] In order to provide a detailed description of a method for assembling a space-use square-shell battery pack provided by the present invention, the above embodiment 1 provides a detailed description of a space-use square-shell battery pack. Based on the same inventive concept, the present application also provides a method for assembling a space-use square-shell battery pack, see embodiment 2 for details.

[0037] See Figure 5 , Figure 5 This is a flow chart of a method for assembling a space-use prismatic cell battery pack according to an embodiment of the present invention. A second embodiment of the present invention provides a method for assembling a space-use prismatic cell battery pack, the method comprising the following steps:

[0038] Step S100: Connect multiple prismatic battery cells in series to form a battery cell group 1, and install buffer pads between adjacent prismatic battery cells.

[0039] As an embodiment, the capacity of the square shell battery cell is 20 to 500Ah, and when the standard charge and discharge rate of the square shell battery cell is 1C, the charge and discharge current corresponding to the square shell battery cell is 58A. When the short-time discharge rate of the square shell battery cell is 4C, the discharge current corresponding to the square shell battery cell is 232A.

[0040] Specifically, the series connection of high-rate, large-capacity square-shell battery cells and the installation of buffer pads will form a battery cell group 1 with a compact structure and a certain expansion space. The buffer pads allow the battery cells to expand moderately without mechanical damage during the charge and discharge process, while maintaining insulation between the battery cells to prevent short circuits.

[0041] Step S200: Installing end plates 2 on both sides of the cell group 1 in the thickness direction, installing buffer pads between the end plates 2 and both sides of the cell group 1 in the thickness direction, and applying pre-pressure to the cell group 1 by the end plates 2 at a preset pressure value to restrict expansion of the cell group 1 in the thickness direction;

[0042] As an implementation manner, the preset pressure value is greater than or equal to 3000N.

[0043] Specifically, by installing the end plate 2 and applying preload, mechanical constraints can be used to limit the expansion of the cell pack 1 in the thickness direction. The preset pressure value ensures structural stability during the charge and discharge process, preventing structural failure due to excessive expansion. For example, by applying preload to the cell pack 1 at a preset pressure value using hydraulic equipment or bolt tightening, and by using a pressure sensor to monitor and adjust the pressure to the set value, a complete system for restraining the expansion of the cell pack 1 in the thickness direction is established, thereby improving the reliability of the cell pack 1.

[0044] Step S300: Installing a panel 3 on both sides of the cell group 1 in the longitudinal direction, and installing a pressure plate on the top of the cell group 1, and locking the pressure plate and the end plate 2 to restrict the vertical displacement of the cell group 1;

[0045] Specifically, the installation of the enclosure 3 and the pressure plate mechanically secures and enhances the structural stability of the cell pack 1 in both the longitudinal and vertical directions. The enclosure 3 prevents longitudinal displacement of the cell pack 1, while the pressure plate limits vertical displacement, collectively enhancing the cell pack 1's resistance to vibration and impact in complex spatial environments. For example, guide grooves or locating pins can be provided between the enclosure 3 and the pressure plate to improve installation precision. Reinforcing ribs can also be provided on the surface of the pressure plate to enhance structural strength.

[0046] Step S400: Cold-pressing a plurality of wires into a power busbar through copper noses, wherein the power busbar is connected to the battery cell tabs;

[0047] Specifically, cold-pressing a busbar to create a power busbar by using hydraulic clamps to cold-press multiple conductors through copper lugs can reduce welding steps and avoid degradation of conductor performance caused by the heat-affected zone. Cold-pressing also improves assembly efficiency, reduces contact resistance, minimizes energy loss, and enhances busbar reliability.

[0048] In step S500 , heating plates are installed on both sides of the battery cell group 1 in the longitudinal direction, and the heating plates are located between the enclosure 3 and the battery cell group 1 .

[0049] Specifically, the heating plate can be attached to the battery cell group 1 by means of thermal adhesive or mechanical fixation to improve the heat conduction efficiency. The power cord of the heating plate can be led out through the reserved hole to connect to the external power supply. The installation of the heating plate can simplify the assembly process, improve the heating efficiency by directly attaching to the battery cell group 1, and enable the battery cell group 1 to quickly heat up to the operating temperature range in a low temperature environment. For example, the heating plate can use a flexible heating element such as a PI film heating plate or a silicone heating plate to adapt to the surface shape of the battery cell group 1. The surface of the heating plate can also be coated with an insulating and high-temperature resistant coating to improve safety.

[0050] An embodiment of the present invention provides a method for assembling a space-use prismatic cell battery pack, further comprising placing a cover plate 4 over the outside of the pressure plate, integrating a power harness and connector onto the cover plate 4, and locking the cover plate 4 to the enclosure 3. A PCB is mounted on the pressure plate, and the PCB is connected to the positive and negative electrodes of the cell.

[0051] Specifically, the cover plate 4 can be locked to the enclosure 3 by bolts to form a sealing structure. By installing a PCB circuit board on the pressure plate, the PCB circuit board is connected to the positive and negative poles of the battery cell through wires to realize the status monitoring and control function of the battery cell group 1. After the cover plate 4 is covered and locked with the enclosure 3, the overall structural strength of the battery cell group 1 will be enhanced and the internal components will be protected from the influence of the external environment. The power harness and connector are integrated into the cover plate 4, which is conducive to simplifying electrical connections and improving assembly efficiency. Heat dissipation ribs can also be set on the surface of the cover plate 4 to improve heat dissipation performance. The PCB circuit board can be integrated with temperature sensors and voltage monitoring modules to realize real-time monitoring of the status of the battery cell group 1.

[0052] The present invention provides a method for assembling a square shell battery pack for space use, which comprises the following steps: connecting a plurality of square shell battery cells in series to form a battery cell group 1, installing buffer pads between adjacent square shell battery cells; installing end plates 2 on both sides of the battery cell group 1 in a thickness direction, and installing buffer pads between both sides of the battery cell group 1 in a thickness direction and the end plates 2, and applying pre-pressure to the battery cell group 1 according to a preset pressure value to restrain the expansion of the battery cell group 1 in a thickness direction; installing a surrounding plate 3 on both sides of the battery cell group 1 in a length direction, and installing a pressure plate on the top of the battery cell group 1, and locking the pressure plate and the end plate 2 to restrain the displacement of the battery cell group 1 in a vertical direction; cold pressing a plurality of wires through copper noses to form a power busbar, and the power busbar is connected to the battery cell tabs; installing a heating plate on both sides of the battery cell group 1 in a length direction, and the heating plate is located between the surrounding plate 3 and the battery cell group 1. In this way, by connecting high-rate, large-capacity square shell battery cells in series and installing buffer pads, a battery cell group 1 with a compact structure and a certain expansion space is formed. End plates 2 are installed on both sides of the battery cell group 1 in the thickness direction and pre-pressure is applied to effectively restrain the expansion of the battery cell during the charging and discharging process, and prevent structural failure caused by expansion. The installation of the enclosure 3 and the pressure plate is conducive to enhancing the structural stability of the battery cell group 1 in the length and vertical directions, and improving the reliability of the battery cell group 1 in complex space environments. The cold pressing production and connection method of the power busbar will reduce the welding process, improve the assembly efficiency and the reliability of the busbar. The installation of the heating plate not only simplifies the assembly process, but also helps to improve the heating efficiency, so that the battery cell group 1 can work normally in a low temperature environment. Thereby achieving the technical effect of avoiding the capacity limitation, bulky volume and uncontrolled expansion of the battery cell in space applications, and improving reliability and environmental adaptability.

[0053] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A square-shell battery pack for space use, characterized in that: The space-use square-shell battery pack includes a cell group, a constraint component and an electrical component. The cell group includes multiple square-shell cell monomers, and multiple square-shell cell monomers are connected in series. The constraint component includes end plates arranged on both sides of the thickness direction of the cell group, and enclosures arranged on both sides of the length direction of the cell group. The enclosures cooperate with the end plates to fix the cell group. A pressure plate is arranged on the top of the cell group and locked with the end plates. A buffer pad is installed between two adjacent cells and between the cell group and the end plates; the electrical component includes a power bus and a heating plate installed on both sides of the length direction of the cell group. The power bus is formed by cold pressing multiple wires through a copper nose, and the power bus is connected to the cell pole ear.

2. The square-shell battery pack for space use according to claim 1, characterized in that: The buffer pad is made of elastic insulating material.

3. The square-shell battery pack for space use according to claim 2, characterized in that: The cushioning pad is configured such that when subjected to pressure perpendicular to a thickness direction of the cushioning pad, a ratio of a compressed thickness of the cushioning pad after deformation to an original thickness is 45% to 55%.

4. The square-shell battery pack for space use according to claim 1, characterized in that: The pressure plate is covered with a cover plate, on which a power harness and a connector are respectively installed, and the cover plate is locked with the enclosure plate.

5. The square-shell battery pack for space use according to claim 4, characterized in that: A PCB circuit board is installed on the pressing plate, and the PCB circuit board is connected to the positive and negative electrodes of the battery cell.

6. A method for assembling a space-use square-shell battery pack, characterized in that: The method for assembling a space-use square-shell battery pack includes: Connect multiple square shell battery cells in series to form a battery cell group, and install buffer pads between adjacent square shell battery cells; End plates are respectively installed on both sides of the battery cell group in the thickness direction, and buffer pads are respectively installed between the end plates and both sides of the battery cell group in the thickness direction, and the end plates apply pre-pressure to the battery cell group according to a preset pressure value to restrict the expansion of the battery cell group in the thickness direction; A surrounding plate is installed on both sides of the length direction of the battery cell group, and a pressure plate is installed on the top of the battery cell group. The pressure plate and the end plate are locked to constrain the displacement of the battery cell group in the vertical direction; Cold pressing a plurality of wires into a power busbar through a copper nose, wherein the power busbar is connected to the battery cell tabs; A heating plate is installed on both sides of the battery cell group in the length direction, and the heating plate is located between the enclosure and the battery cell group.

7. The method for assembling a square-shell battery pack for space use according to claim 6, characterized in that: The capacity of the square shell battery cell is 20 to 500Ah. When the standard charge and discharge rate of the square shell battery cell is 1C, the corresponding charge and discharge current of the square shell battery cell is 58A. When the short-time discharge rate of the square shell battery cell is 4C, the corresponding discharge current of the square shell battery cell is 232A.

8. The method for assembling a square-shell battery pack for space use according to claim 6, characterized in that: The preset pressure value is greater than or equal to 3000N.

9. The method for assembling a square-shell battery pack for space use according to claim 6, characterized in that: The method for assembling a space-use square-shell battery pack further includes covering the outer side of the pressure plate with a cover plate, integrating a power harness and a connector on the cover plate, and locking the cover plate with the enclosure plate.

10. The method for assembling a square-shell battery pack for space use according to claim 9, characterized in that: A PCB circuit board is installed on the pressing plate, and the PCB circuit board is connected to the positive and negative electrodes of the battery cell.

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