Pouch battery module

Abstract

The application discloses a soft package battery module, which comprises a fixed frame, a shell and a cell supporting member; the fixed frame comprises a shell connecting part, a cell accommodating cavity and a lifting lug plate, and a supporting plate nut is arranged on the shell connecting part; a plurality of single cells are arranged in the cell accommodating cavity in sequence, and a foam partition plate is arranged between adjacent cells; the cell supporting member is a C-shaped foam supporting block; the shell comprises a bottom plate, a surrounding plate arranged on the upper surface of the bottom plate and three adjacent side surfaces, and a side cover plate is detachably arranged on the other side surface; a partition plate is arranged in a space enclosed by the surrounding plate and the side cover plate, the partition plate divides the space into a battery compartment and a battery management compartment; and an upper cover plate is arranged on the upper surfaces of the surrounding plate and the side cover plate. The fixed frame adopting the technical scheme can resist the expansion force generated by the expansion deformation of the soft package battery module, the shell has good heat preservation performance, and can adapt to a lower temperature environment in the near space.

Description

Technical Field

[0001] This invention belongs to the field of near-space vehicles, and specifically relates to a pouch battery module. Background Technology

[0002] In recent years, near-space vehicles have become an increasingly prominent research hotspot. Due to the unique low-temperature environment of near-space, the battery casings used in near-space vehicles need to have excellent thermal insulation properties, combined with heating control measures, to keep the batteries within a suitable operating temperature range. Currently, the most commonly used casings are carbon fiber foam sandwich shells and aluminum alloy shells with aerogel lining the inner wall. Among them, carbon fiber foam sandwich shells are lightweight, have good rigidity, and excellent thermal insulation performance, while aluminum alloy shells, in pursuit of even lighter weight, have thinner walls and poorer rigidity.

[0003] The energy density requirements of near-space vehicle energy systems are becoming increasingly stringent, which not only imposes greater constraints on the weight of the outer casing but also presents new challenges in the selection of battery cells. Pouch cells offer higher energy density than rigid-cased cells, but pouch batteries themselves have lower strength and rigidity, making them prone to bulging and deformation. Traditional battery casings are susceptible to significant deformation due to the expansion forces of pouch battery modules, affecting the overall appearance and potentially causing dimensional deviations.

[0004] Therefore, when applying pouch batteries to the energy system of near-space vehicles, it is necessary to consider not only the inherent tendency of pouch batteries to swell and deform, but also the influence of ambient temperature, so that the battery casing can both resist the expansion force of the pouch battery module and have a heat preservation function. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a soft-pack battery module with good thermal insulation performance and the ability to adapt to the low temperature environment of the adjacent space.

[0006] The present invention is implemented as follows: a soft-pack battery module includes a fixed frame for accommodating several individual battery cells, a housing for accommodating the entire fixed frame, and battery cell support components installed at both ends of the fixed frame.

[0007] The fixing frame includes an outer shell connecting part, a cell receiving cavity, and a lifting ear plate. The outer shell connecting part is provided with a support plate nut. Several individual cells are arranged in sequence in the cell receiving cavity, and foam partitions are provided between adjacent cells.

[0008] The cell support component is a C-shaped foam support block, and the vertical plate of the foam support block is provided with an insertion slot for inserting the cell tabs.

[0009] The housing includes a bottom plate, with enclosing plates provided on three adjacent side surfaces of the upper surface of the bottom plate, and a side cover plate detachably installed on the other side surface; a partition plate is provided in the space enclosed by the enclosing plates and the side cover plate, and the partition plate divides the space enclosed by the enclosing plates and the side cover plate into a battery compartment and a battery management compartment; an upper cover plate is installed on the upper surfaces of the enclosing plates and the side cover plate.

[0010] Preferably, a reinforcing edge strip is provided at the arc-shaped corner of the battery cell accommodating cavity.

[0011] Preferably, a reinforcing plate is provided on the side plate of the battery cell accommodating cavity.

[0012] Preferably, a lifting hole is provided on the lifting lug plate at the connection part between the side plate of the battery cell accommodating cavity and the housing.

[0013] Preferably, a reinforcing plate is provided on the lifting lug plate.

[0014] Preferably, the housing connection part, the battery cell accommodating cavity and the lifting lug plate of the fixing frame are integrally formed by winding with carbon fiber prepreg and high modulus resin.

[0015] Preferably, the enclosing plates, the partition plate, the side cover plate and the upper cover plate of the housing are a sandwich structure formed by compounding an external carbon fiber prepreg, a central PMI foam board and an internal S-grade glass fiber prepreg.

[0016] Preferably, the bottom plate of the housing includes a carbon fiber board with a "field" character structure, the middle of the "field" character is filled with PMI foam, and then wrapped and compounded with a lower layer of carbon fiber cloth and an upper layer of glass fiber cloth.

[0017] Preferably, for the battery management compartment enclosed by the enclosing plate and the partition plate, the internal S-grade glass fiber prepreg and the external carbon fiber prepreg adopt the process of winding with a whole cloth, and rounding treatment is carried out at the four corners.

[0018] Advantages and technical effects of the present invention:

[0019] The fixing frame adopting the above technical solution of the present invention can resist the expansion force generated by the expansion and deformation of the soft-pack battery module, and the housing has good heat insulation performance and can adapt to the relatively low temperature environment in the adjacent space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a schematic structural diagram of the present invention with the upper cover plate removed;

[0022] Figure 3 is a schematic structural diagram of the fixing frame;

[0023] Figure 4 is a fixed frame and an electric core support member assembly structure schematic diagram;

[0024] Figure 5 is a shell perspective exploded view;

[0025] Figure 6 is a shell main bearing carbon fiber plate structure schematic diagram.

[0026] In the figure, 1, fixed frame; 1-1, shell connecting part; 1-10, supporting plate nut; 1-2, electric core containing cavity; 1-20, reinforcing edge strip; 1-21, reinforcing plate; 1-3, hoisting lug plate; 1-30, hoisting hole; 1-31, reinforcing plate; 2, shell; 2-1, bottom plate; 2-2, enclosure plate; 2-3, side cover plate; 2-4, partition plate; 2-5, battery compartment; 2-6, battery management compartment; 2-7, upper cover plate; 3, electric core support member; 3-1, electric core tab plug-in slot; 4, single electric core; 5, foam partition plate; DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0028] Please refer to Figures 1 to 6 A soft package battery module, comprising a fixed frame 1 for containing a plurality of single electric cores 4, a shell 2 for containing the entire fixed frame, and an electric core support member 3 installed at both ends of the fixed frame;

[0029] Please refer to Figure 3 and Figure 4 The fixed frame 1 comprises a shell connecting part 1-1, an electric core containing cavity 1-2, and a hoisting lug plate 1-3, wherein the shell connecting part is provided with a supporting plate nut 1-10; a plurality of single electric cores 4 are arranged in the electric core containing cavity 1-2 in sequence, and foam partition plates 5 are arranged between adjacent electric cores.

[0030] The electric core support member 3 is a C-shaped foam support block, vertical upright plates of the foam support block are provided with a slot 3-1 for inserting the tab of the electric core; the foam support block is integrally and finely processed from hard thick foam, the height of the foam support block is the same as the width of the soft package battery, and the foam support block can be divided into three sections, the upper section and the lower section have the same width, and the width is greater than the length of the tab of the soft package battery, the middle section has a smaller width, and the width is less than the length of the tab of the soft package battery. A plurality of small slots are left on the foam support frame, the width of the slots is slightly greater than the thickness of the tab of the soft package battery, the depth of the slots is greater than the width of the middle section of the C-shaped foam support frame, the interval distance between every two slots is equal to the sum of the thickness of the soft package battery monomer and the thickness of the compressible foam sheet; after the soft package battery module enters the fixing frame, the tab of each battery is inserted through the slot on the C-shaped foam support frame, and the battery tab is clamped and fixed in the slot. The front end surface of the C-shaped foam support is in contact with the edge folding corner surface of the soft package battery, so that after the soft package battery module enters the shell as a whole, the battery is clamped by the battery compartment side wall of the shell and the foam support in the opening direction of the fixing frame, and the relative sliding of the soft package battery module in the fixing frame is prevented.

[0031] The shell 2 includes a bottom plate 2-1, a surrounding plate 2-2 provided on the upper surface of the bottom plate and three adjacent side surfaces, and a side cover plate 2-3 detachably mounted on the other side surface; a partition plate 2-4 is arranged in the space surrounded by the surrounding plate and the side cover plate, the partition plate divides the space surrounded by the surrounding plate and the side cover plate into a battery compartment 2-5 and a battery management compartment 2-6; and an upper cover plate 2-7 is mounted on the upper surfaces of the surrounding plate and the side cover plate.

[0032] In actual assembly, the monomer electric core of the soft package battery enters the inside of the fixing frame through the two opening sides of the fixing frame, forms a module by series and parallel connection, enters the shell by hoisting, and is fixed with the shell by screwing the counter-sunk reverse mounting hole at the bottom of the shell with the supporting plate nut on the fixing frame.

[0033] In the soft package battery module, a certain thickness of compressible foam partition plate is pasted between every two soft package battery monomers. A certain thickness of compressible foam partition plate is also pasted between the soft package battery module and the side wall of the fixing frame, which is used to buffer and absorb part of the expansion force generated by the soft package battery due to swelling and deformation.

[0034] Preferably, a reinforcing edge strip 1-20 is arranged at the arc-shaped corner of the upper frame of the arch-shaped structure to improve the strength of the arc-shaped corner.

[0035] Preferably, a reinforcing plate 1-5 is arranged on the side plate of the upper frame of the arch-shaped structure to enhance the strength in the swelling direction of the soft package battery.

[0036] Preferably, a lifting lug plate 1-6 is arranged on the connecting part of the side plate and the bottom plate of the upper frame of the arch-shaped structure, and a lifting hole 1-7 is arranged on the lifting lug plate.

[0037] Preferably, a reinforcing plate 1-8 is provided on the lifting lug plate.

[0038] The embodiment has been successfully applied to the design of an energy storage battery for a certain type of airship. The soft-pack battery module in this energy storage battery is composed of a number of battery cells connected in series. Its fixing frame is integrally formed using carbon fiber prepreg and high-modulus resin, adopting the process of internal mold cloth winding, heating and pressurizing for curing. The two sides of the fixing frame are locally thickened, and the four corners are reinforced. The method of using carbon fiber prepreg winding can effectively limit the expansion of the soft-pack battery while meeting the requirements of structural lightweight. The locally strengthened vertical surfaces and corners can ensure the overall structural strength of the fixing frame. The four corners of the fixing frame are processed into rounded corners, and reinforcing edge strips are provided at the four rounded corners of the fixing frame. Reinforcing plates are provided on both sides of the fixing frame. Double-ear stud nuts are riveted inside the bottom of the fixing frame for fixing the battery module in the outer shell, and a fiberglass board is provided below the stud nuts for local strengthening. There are a total of 4 lifting holes on both sides of the fixing frame for lifting the battery pack, and strengthening blocks are provided at the lifting holes. The specific form is referred to Figure 1 .

[0039] The outer shell of this embodiment adopts the form of external carbon fiber prepreg + PMI foam board + internal S-class fiberglass prepreg as a whole, and can be divided into two areas: the battery compartment and the battery management compartment. In the battery compartment part, the inner-layer S-class fiberglass prepreg and the outer-layer carbon fiber prepreg adopt the process of whole cloth winding, and rounded corner treatment is carried out at the four corners to eliminate stress concentration and can also effectively resist the impact force caused by the slippage of the battery module. In the battery management compartment part, a block structure is adopted. The connector is installed on the detachable side cover plate. The two side walls are bonded to the outside of the battery compartment, and the side cover plate is screwed to the two side walls. The upper cover plate is screwed to the shell and the side cover plate to form a stable box structure for the outer shell, which can not only achieve the heat preservation function but also be lightweight on the premise of ensuring strength. In addition, to reduce the overall weight of the outer shell, the main bearing carbon fiber plate at the bottom of the shell is designed in a "field" shape, filled with PMI foam in the middle, and then wrapped with the outer-layer carbon fiber cloth and the inner-layer fiberglass cloth. The specific form is referred to Figure 2 .

[0040] The battery cells of the soft-pack battery are loaded into the fixing frame from the opening of the fixing frame, and a PMI foam board is placed between every two battery cells. The PMI foam board has a certain compressibility and can buffer and absorb part of the expansion force generated by the bulging deformation of the soft-pack battery. After the soft-pack battery cells and the foam board are loaded into the fixing frame, the electrode ears of the battery cells are passed through the slots of the C-shaped foam support and then connected in series by welding. The C-shaped foam support is composed of an upper part and a lower part spliced together, and the lower part is L-shaped. The specific form is referred to Figure 3 .

[0041] The soft package battery module enters the shell through hoisting, and is fixed with the shell by screwing the counter-nut on the supporting plate on the fixed frame through the counter-sunk reverse mounting hole at the bottom of the shell. The width of the fixed frame is smaller than the width inside the battery compartment of the shell. After the fixed frame enters the shell and is fixed by the screw, there is a certain gap between the side of the fixed frame and the side wall of the shell, which leaves a small deformation space for the fixed frame, so that the expansion deformation of the soft package battery does not affect the overall size of the shell.

[0042] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A soft-pack battery module, characterized by: It includes a fixing frame for accommodating several single cells, a housing for accommodating the entire fixing frame, and cell support members installed at both ends of the fixing frame; The fixing frame includes a housing connection part, a cell accommodation cavity and a lifting ear plate, and a pallet nut is provided on the housing connection part; Several single cells are arranged in sequence in the cell accommodation cavity, and a foam separator is provided between adjacent cells; The cell support member is a foam support block with a C-shaped structure, and an insertion slot for inserting the cell tab is provided on the vertical upright plate of the foam support block; The housing includes a bottom plate, and enclosing plates are provided on three adjacent side surfaces on the upper surface of the bottom plate, and a side cover plate is detachably installed on the other side surface; A partition is provided in the space enclosed by the enclosing plate and the side cover plate, and the partition divides the space enclosed by the enclosing plate and the side cover plate into a battery compartment and a battery management compartment; An upper cover plate is installed on the upper surfaces of the enclosing plate and the side cover plate.

2. The pouch battery module of claim 1, wherein: A reinforcing edge strip is provided at the arc-shaped corner of the cell accommodation cavity.

3. The pouch battery module of claim 1, wherein: A reinforcing plate is provided on the side plate of the cell accommodation cavity. 4.The soft-pack battery module of claim 1, wherein: A lifting hole is provided on the lifting ear plate at the connection between the side plate of the cell accommodation cavity and the housing connection part. 5.The soft-pack battery module of claim 1, wherein: A reinforcing plate is provided on the lifting ear plate.

6. The pouch battery module of claim 1, wherein: The housing connection part, the cell accommodation cavity and the lifting ear plate of the fixing frame are integrally wound and formed by using carbon fiber prepreg and high modulus resin.

7. The pouch battery module of claim 1, wherein: The enclosing plate, the partition, the side cover plate and the upper cover plate of the housing are a sandwich structure formed by compounding an external carbon fiber prepreg, a central PMI foam board and an internal S-class glass fiber prepreg.

8. The pouch battery module of claim 1, wherein: The bottom plate of the housing includes a carbon fiber plate with a "field" character structure, the middle of the "field" character is filled with PMI foam, and then wrapped and compounded with a lower layer of carbon fiber cloth and an upper layer of glass fiber cloth.

9. The pouch battery module of claim 1, wherein: For the battery management compartment enclosed by the enclosing plate and the partition, the internal S-class glass fiber prepreg and the external carbon fiber prepreg adopt the process of winding with a whole cloth, and fillet treatment is carried out at the four corners.

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