Battery cell support and soft package battery module

Abstract

The utility model discloses a battery cell support and a soft package battery module, the battery cell support comprises a first box plate, a second box plate and a cover plate, the first box plate and the second box plate are respectively provided with a first convex wall arranged along the longitudinal direction and a second convex wall arranged along the transverse direction, and the first box plate and the second box plate are oppositely arranged; the first convex wall and the second convex wall on the first box plate are correspondingly connected with the first convex wall and the second convex wall on the second box plate respectively to form a box body structure with an upward opening; connecting ports are respectively formed in two opposite side walls of the box body structure; and the cover plate is buckled in the opening. The soft package battery module comprises a battery cell and a battery cell bracket, after the battery cell is arranged in the box body, the cover plate is covered, and a pre-tightening force is applied to fix the cover plate. According to the battery cell support provided by the invention, the pre-tightening force can be conveniently applied to the battery cell, the whole structure of the battery cell support is simple, the weight is relatively light, the whole weight of the formed soft package battery is not too large, and the battery cell support is conveniently popularized and applied to various mobile power demand scenes such as a vehicle-mounted scene and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-pack batteries, and in particular to a battery core bracket and a soft-pack battery module. Background Art

[0002] Soft-pack batteries are batteries encapsulated in an aluminum-plastic composite film. They offer advantages such as light weight, low mold costs, and high safety. Soft-pack batteries require a preload to improve performance and safety. Soft-pack batteries expand and deform after long-term use. Applying a preload can reduce this expansion and deformation. The amount of preload applied directly impacts the battery's lifespan and performance. Too little preload may not provide a preload effect or may cause the battery layers to separate, impacting battery cycling or leading to insufficient discharge. Excessive preload can lead to excessive capacity decay and even localized deformation and chemical degradation of the separator, impacting the battery's overall performance and lifespan.

[0003] The existing soft-pack battery (patent document with application number 2018222278802) mainly has multiple stacked cell holders, and the cells are arranged inside the cell holders. Such a battery structure is relatively complex, and it is not convenient to apply pre-tightening force to each cell. In addition, the multiple stacked cell holder structures make the overall weight of the soft-pack battery larger. Utility Model Content

[0004] In response to the above problems, the present invention proposes a battery cell bracket and a soft-pack battery module.

[0005] The technical solutions adopted by this utility model are as follows:

[0006] The present application provides a battery cell holder, which has a box structure and includes a first box plate, a second box plate, and a cover plate. A first convex wall and a second convex wall are respectively formed on the box plate body of the first box plate and the box plate body of the second box plate, wherein the first convex wall is arranged in the longitudinal direction and the second convex wall is arranged in the transverse direction.

[0007] The first box plate and the second box plate are arranged opposite to each other, and the first convex wall and the second convex wall on the first box plate are respectively connected to the first convex wall and the second convex wall on the second box plate to form the box structure with an upward opening;

[0008] The two opposite side walls of the box structure are respectively formed with connection ports, and the connection ports are used for the tabs of the power core to pass through;

[0009] The cover plate is buckled in the opening and fixed to the first box plate and the second box plate.

[0010] In actual use, after the battery cells are stacked and arranged inside the box, the cover plate is placed, a pre-tightening force is applied, and the cover plate is fixed to the first box plate and the second box plate. In other words, the battery cell holder provided by this application facilitates the application of pre-tightening force to the battery cells, and the overall structure of the battery cell holder is simple and lightweight. When the same number of battery cells are installed in the battery cell holder provided by this application, the overall weight of the soft-pack battery formed will not be too large, which facilitates its promotion and application in various mobile power-demanding scenarios such as vehicles.

[0011] The box-type battery cell support is formed by assembling a first box plate and a second box plate with the same structure, which has high versatility and is convenient for reducing production costs.

[0012] Furthermore, the first convex wall and the second convex wall are respectively arranged perpendicular to the plate surface of the first box board or the plate surface of the second box board and are located on the same side of the plate surface of the first box board or the plate surface of the second box board;

[0013] The height of the first convex wall is smaller than the height of the second convex wall.

[0014] Furthermore, the first convex wall on the first box plate or the second box plate includes two first convex walls, the two first convex walls are a first convex wall A and a first convex wall B, and the second convex wall is located between the first convex wall A and the first convex wall B;

[0015] The first convex wall A of the first box panel and the first convex wall B of the second box panel are arranged correspondingly and form the left side wall of the box structure. The first convex wall B of the first box panel and the first convex wall A of the second box panel are arranged correspondingly and form the right side wall of the box structure. The second convex wall of the first box panel and the second convex wall of the second box panel are docked and fixed to form the bottom wall of the box structure. The box panel bodies of the first box panel and the second box panel respectively form the front side wall and the rear side wall of the box structure.

[0016] Furthermore, the second convex wall of the first box plate and the second convex wall of the second box plate are connected and fixed by welding or fasteners;

[0017] Alternatively, the first box plate and the second box plate are integrally formed. The integral formation of the first box plate and the second box plate can reduce the assembly process. During actual use, different shapes of battery cell holders can be selected according to the convenience of assembly.

[0018] Furthermore, the first convex wall A, the first convex wall B and the second convex wall are respectively located at the left end, the right end and the lower end of the first box board or the second box board;

[0019] The box plate body of the first box plate and the box plate body of the second box plate are respectively protruded from the first convex wall A and the first convex wall B, and the parts protruding from the first convex wall A and the first convex wall B are convex parts.

[0020] Furthermore, the first convex wall A and the first convex wall B are respectively welded or bonded to the first box plate or the second box plate;

[0021] The second convex wall is welded or bonded or integrally formed with the first box plate or the second box plate.

[0022] In actual use, the second convex wall can also be formed by bending the lower end of the first box board or the second box board by 90 degrees.

[0023] Furthermore, heat dissipation holes are formed on the box plate body of the first box plate and the box plate body of the second box plate respectively, and the heat dissipation holes facilitate heat dissipation of the battery cells.

[0024] Furthermore, the cover plate is fixed to the first box plate and the second box plate through the first convex wall.

[0025] Furthermore, a vertically arranged strip hole is formed on the first convex wall, and the connecting member passes through the strip hole and is fixed to the cover plate.

[0026] Furthermore, the connecting member is a fastener, which is embedded and fixed laterally along the cover plate. The fastener can be a screw or a bolt.

[0027] Existing soft-pack batteries include a cell holder and a cell mounted within the holder. After applying a preload to the cell, an end cap is bonded to the top of the cell to complete the preload. However, this bonding can fail over time, or as the battery's frequency of use increases, the battery expands, lifting the end cap and rendering the preload ineffective, thereby reducing battery performance and safety. This application utilizes fasteners to secure the cover, which is more conducive to maintaining the preload.

[0028] Furthermore, a first convex wall is formed at the left end of the first box plate and the right end of the second box plate respectively;

[0029] The first convex wall is formed with the connecting port;

[0030] The first convex wall and the second convex wall have the same height.

[0031] The present application also provides a soft-pack battery module, comprising a battery cell and a battery cell bracket, wherein the battery cell is arranged inside the battery cell bracket, and the battery cell bracket is one of the above-mentioned battery cell brackets.

[0032] Furthermore, an EVA cotton buffer is included, and the EVA cotton buffer is arranged between the battery core and the second convex wall and between the battery core and the cover plate.

[0033] The EVA cotton buffer is used to provide a buffer space for the deformation of the battery cell after long-term use and maintain the preload.

[0034] Furthermore, it further includes an adapter plate, on which a through-hole is formed, and the adapter plate is arranged on the first convex wall and corresponding to the connecting port;

[0035] The tabs of the battery cell pass through the connection port and the perforation in sequence and extend to the outside of the battery cell bracket.

[0036] The adapter plate is arranged on the left and / or right side walls of the box structure. The adapter plate is used to connect the battery cells in the box structure of the battery cell holder with external electrical components or control components. In actual use, the adapter plate is clamped between two oppositely arranged protrusions.

[0037] In actual use, the process of assembling the cell bracket provided in this application into a soft-pack battery module includes:

[0038] The first box plate and the second box plate are connected to form a box structure, and the second convex wall of the first box plate is fixed to the second convex wall of the second box plate;

[0039] Place an EVA cotton buffer at the bottom of the box, install the battery cells in a stacked manner inside the box of the battery cell holder, so that the battery cell tabs pass through the connection port, and place an EVA cotton buffer above the topmost battery cell;

[0040] Putting the cover plate on the battery cell, using a pre-tightening device to apply a pre-tightening force to the battery cell through the cover plate, and in the pre-tightened state, fixing the cover plate to the first box plate and the second box plate respectively by fasteners, specifically, the fasteners are connected to the cover plate through the strip holes on the first convex wall;

[0041] Finally, the adapter plate is installed on the outside of the first convex wall so that the tabs of the battery cell pass through the through-holes of the adapter plate to complete the transfer of the battery cell, and a soft-pack battery module with stable pre-tightening force can be assembled.

[0042] This application maintains the preload by the cell holder and precisely controls the size of the preload in combination with the preload equipment. This not only optimizes the structural design of the soft-pack battery, improves the energy density and safety of the battery, but also ensures that the battery maintains good performance under various environmental conditions.

[0043] The beneficial effects of the utility model are:

[0044] (1) The cell holder provided in the present application is convenient for applying pre-tightening force to the cell, and the overall structure of the cell holder is simple and lightweight. When the same number of cells are installed in the cell holder provided in the present application, the overall weight of the soft-pack battery formed will not be too large, which is convenient for promotion and application in various mobile power-demanding scenarios such as vehicles.

[0045] (2) A box-type battery cell holder is formed by assembling a first box plate and a second box plate of the same structure, which has high versatility and is convenient for reducing production costs.

[0046] (3) After the battery cell holder provided by the present application is installed with the battery cell and a pre-tightening force is applied, it is laterally embedded and fixed along the cover plate by fasteners. The high firmness is also conducive to maintaining the pre-tightening force. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic structural diagram of a battery cell support according to Example 1 of the present utility model;

[0048] Figure 2 yes Figure 1 A schematic diagram of the partially enlarged structure of the middle part;

[0049] Figure 3 This is a schematic diagram of the axial structure of the first box plate or the second box plate of Example 1 of the present utility model;

[0050] Figure 4 This is a schematic diagram of the axial structure of the soft-pack battery module of Example 1 of the present utility model;

[0051] Figure 5 yes Figure 4 Schematic diagram of the locally enlarged structure of B in the middle.

[0052] The reference numerals in the figures are:

[0053] 100, battery cell holder; 1, first box plate; 11, box plate body; 111, convex portion; 112, heat dissipation hole; 12, first convex wall; 121, first convex wall A; 122, first convex wall B; 123, strip hole; 13, second convex wall; 101, connection port; 2, second box plate; 3, cover plate; 200, battery cell; 201, tab; 300, adapter plate; 301, perforation. DETAILED DESCRIPTION

[0054] The present invention will be described in detail below with reference to the accompanying drawings.

[0055] Example 1

[0056] like Figures 1 to 3 As shown, the present application provides a battery cell holder, which has a box structure and includes a first box plate 1, a second box plate 2 and a cover plate 3. A first convex wall 12 and a second convex wall 13 are respectively formed on the box plate body 11 of the first box plate 1 and the box plate body 11 of the second box plate 2. The first convex wall 12 is arranged in the longitudinal direction, and the second convex wall 13 is arranged in the transverse direction.

[0057] The first box plate 1 and the second box plate 2 are arranged opposite to each other, and the first convex wall 12 and the second convex wall 13 on the first box plate 1 are respectively connected to the first convex wall 12 and the second convex wall 13 on the second box plate 2 to form a box structure with an upward opening;

[0058] Two opposite side walls of the box structure are respectively formed with connection ports 101, which are used for the tabs of the power core to pass through;

[0059] The cover plate 3 is buckled into the opening and fixed to the first box plate 1 and the second box plate 2 .

[0060] In actual use, after the battery cells are stacked and arranged inside the box, the cover plate 3 is placed, a pre-tightening force is applied, and the cover plate 3 is fixed to the first box plate 1 and the second box plate 2. That is, the battery cell holder provided in this application facilitates the application of pre-tightening force to the battery cells, and the overall structure of the battery cell holder is simple and lightweight. When the same number of battery cells are installed in the battery cell holder provided in this application, the overall weight of the soft-pack battery formed will not be too large, which facilitates its promotion and application in various mobile power-demanding scenarios such as vehicles.

[0061] In this embodiment, the first convex wall 12 and the second convex wall 13 are respectively arranged perpendicular to the plate surface of the first box board 1 or the plate surface of the second box board 2 and are located on the same side of the plate surface of the first box board 1 or the plate surface of the second box board 2;

[0062] The height of the first protruding wall 12 is smaller than that of the second protruding wall 13 , so as to facilitate the formation of the connecting port 101 .

[0063] In this embodiment, the first convex wall 12 on the first box board 1 or the second box board 2 includes two first convex walls 12, namely the first convex wall A121 and the first convex wall B122, and the second convex wall 13 is located between the first convex wall A121 and the first convex wall B122;

[0064] The first convex wall A121 of the first box panel 1 and the first convex wall B122 of the second box panel 2 are correspondingly arranged and form the left side wall of the box structure. The first convex wall B122 of the first box panel 1 and the first convex wall A121 of the second box panel 2 are correspondingly arranged and form the right side wall of the box structure. The second convex wall 13 of the first box panel 1 and the second convex wall 13 of the second box panel 2 are docked and fixed to form the bottom wall of the box structure. The box panel bodies 11 of the first box panel 1 and the second box panel 2 respectively form the front side wall and the rear side wall of the box structure.

[0065] In this embodiment, the second convex wall 13 of the first box panel 1 and the second convex wall 13 of the second box panel 2 are butted together, which means that the end surfaces of the two second convex walls 13 are in contact with each other.

[0066] In this embodiment, the first protruding wall A121 and the first protruding wall B122 have the same height, and the connecting port 101 is located in the middle of the left wall and the right wall, respectively.

[0067] In this embodiment, the second convex wall 13 of the first box plate 1 and the second convex wall 13 of the second box plate 2 are fixed by welding;

[0068] In other embodiments, the second protruding wall 13 of the first box panel 1 and the second protruding wall 13 of the second box panel 2 may be connected and fixed by fasteners.

[0069] In other embodiments, the first box panel 1 and the second box panel 2 are integrally formed.

[0070] In this embodiment, the first convex wall A121, the first convex wall B122 and the second convex wall 13 are respectively located at the left end, the right end and the lower end of the first box board 1 or the second box board 2;

[0071] The box plate body 11 of the first box plate 1 and the box plate body 11 of the second box plate 2 are respectively protruded from the first convex wall A121 and the first convex wall B122, and the parts protruding from the first convex wall A121 and the first convex wall B122 are convex parts 111.

[0072] In this embodiment, the first convex wall A121 and the first convex wall B122 are respectively welded or bonded to the first box panel 1 or the second box panel 2;

[0073] The second convex wall 13 is welded or bonded or integrally formed with the first box panel 1 or the second box panel 2 .

[0074] In actual use, the second convex wall 13 can also be formed by bending the lower end of the first box board 1 or the second box board 2 by 90 degrees.

[0075] In this embodiment, heat dissipation holes 112 are formed on the box body 11 of the first box plate 1 and the box body 11 of the second box plate 2 respectively. The heat dissipation holes 112 facilitate heat dissipation of the battery cells.

[0076] In this embodiment, the heat dissipation holes 112 include a plurality of holes 112 that are evenly distributed.

[0077] In this embodiment, the cover plate 3 is fixed to the first box plate 1 and the second box plate 2 via the first protruding wall 12 .

[0078] In this embodiment, a vertically arranged strip hole 123 is formed on the first protruding wall 12 , and the connecting member passes through the strip hole 123 and is fixed to the cover plate 3 .

[0079] In this embodiment, the connecting member is a fastener (not shown in the figure), which is embedded and fixed laterally along the cover plate 3. The fastener can be a screw or a bolt.

[0080] Conventional soft-pack batteries include a cell holder and a cell disposed within the holder. After applying a preload to the cell, an end cap is bonded to the cell to complete the preload. However, over time, the bond can fail. Alternatively, as the battery's frequency of use increases, the battery expands, lifting the end cap and rendering the preload ineffective, thereby reducing battery performance and safety. The present invention utilizes fasteners to secure the cover plate 3, which is more conducive to maintaining the preload.

[0081] like Figure 1 、 Figure 4 and Figure 5 As shown, the present application also provides a soft-pack battery module, including a battery cell 200 and a battery cell holder 100 , wherein the battery cell 200 is arranged inside the battery cell holder 100 , and the battery cell holder 100 is one of the above-mentioned battery cell holders.

[0082] In this embodiment, an EVA cotton buffer (not shown) is further included. The EVA cotton buffer is arranged between the battery cell 200 and the second protruding wall 13 and between the battery cell 200 and the cover plate 3 .

[0083] The EVA cotton buffer is used to provide a buffer space for deformation of the battery cell 200 after long-term use, thereby maintaining the preload force.

[0084] In this embodiment, an adapter plate 300 is further included. A through hole 301 is formed on the adapter plate 300. The adapter plate 300 is disposed on the first convex wall 12 and corresponds to the connection port 101.

[0085] The tabs 201 of the battery cell 200 pass through the connection port 101 and the through-hole 301 in sequence and extend to the outside of the battery cell holder 100 .

[0086] The adapter plates 300 are respectively disposed on the left and right walls of the box structure. The adapter plates 300 are used to connect the battery cells 200 within the box structure of the battery cell holder 100 to external electrical components or control components. In this embodiment, the adapter plates 300 are clamped between the two oppositely disposed protrusions 111.

[0087] In actual use, the process of assembling the cell bracket provided in this application into a soft-pack battery module includes:

[0088] The first box plate 1 and the second box plate 2 are connected to form a box structure, and the second convex wall 13 of the first box plate 1 is fixed to the second convex wall 13 of the second box plate 2;

[0089] Place an EVA cotton cushion at the bottom of the box, install the battery cells 200 in a stacked manner inside the box of the battery cell holder 100, so that the tabs 201 of the battery cells 200 pass through the connection port 101, and place an EVA cotton cushion above the topmost battery cell 200;

[0090] Put on the cover plate 3, use the pre-tightening device to apply pre-tightening force to the battery cell 200 through the cover plate 3, and in the pre-tightened state, fix the cover plate 3 to the first box plate 1 and the second box plate 2 respectively by fasteners. Specifically, the fasteners pass through the strip-shaped holes 123 on the first convex wall 12 and connect with the cover plate 3;

[0091] Finally, the adapter plate 300 is installed on the outside of the first protruding wall 12 so that the tabs 201 of the battery cell 200 pass through the through holes 301 of the adapter plate 300 to complete the transfer of the battery cell 200, and a soft-pack battery module with stable pre-tightening force can be assembled.

[0092] This application maintains the preload force through the cell holder 100 and combines the preload force equipment to accurately control the size of the preload force. This can not only optimize the structural design of the soft-pack battery, improve the energy density and safety of the battery, but also ensure that the battery can maintain good performance under various environmental conditions.

[0093] Example 2

[0094] The difference between this embodiment and embodiment 1 is that the side walls of the box structure formed by the first convex wall are different. In this embodiment, a first convex wall is formed on the left end of the first box plate and the right end of the second box plate respectively.

[0095] Connecting ports are respectively formed on the two first convex walls;

[0096] The first convex wall and the second convex wall have the same height.

[0097] In this embodiment, the first convex wall of the first box plate is fixed to the left end of the second box plate, and the first convex wall of the second box plate is fixed to the right end of the first box plate. Specifically, the fixing can be performed by welding.

[0098] The descriptions of “front,” “back,” “left,” “right,” “up,” and “down” in this application are illustrative and relative, and are not intended to limit the scope of the present invention to the above-mentioned embodiments.

[0099] The above description is only a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structural transformation made by using the contents of the description and drawings of the present invention, directly or indirectly applied in other related technical fields, is also included in the scope of protection of the present invention.

Claims

1. A battery cell bracket, characterized in that: The battery cell support is a box structure, comprising a first box plate, a second box plate and a cover plate, wherein a first convex wall and a second convex wall are respectively formed on the box plate body of the first box plate and the box plate body of the second box plate, wherein the first convex wall is arranged in the longitudinal direction and the second convex wall is arranged in the transverse direction; The first box plate and the second box plate are arranged opposite to each other, and the first convex wall and the second convex wall on the first box plate are respectively connected to the first convex wall and the second convex wall on the second box plate to form the box structure with an upward opening; The two opposite side walls of the box structure are respectively formed with connection ports, and the connection ports are used for the tabs of the power core to pass through; The cover plate is buckled in the opening and fixed to the first box plate and the second box plate.

2. A battery cell support according to claim 1, characterized in that: The second convex wall of the first box plate and the second convex wall of the second box plate are connected and fixed by welding or fasteners; Alternatively, the first box plate and the second box plate are integrally formed.

3. The battery cell support according to claim 1, wherein: The first convex wall and the second convex wall are respectively arranged perpendicular to the plate surface of the first box board or the plate surface of the second box board and are located on the same side of the plate surface of the first box board or the plate surface of the second box board; The height of the first convex wall is smaller than the height of the second convex wall.

4. The battery cell support according to claim 1, wherein: The first convex wall on the first box plate or the second box plate includes two first convex walls, the two first convex walls are a first convex wall A and a first convex wall B, and the second convex wall is located between the first convex wall A and the first convex wall B; The first convex wall A of the first box panel and the first convex wall B of the second box panel are arranged correspondingly and form the left side wall of the box structure. The first convex wall B of the first box panel and the first convex wall A of the second box panel are arranged correspondingly and form the right side wall of the box structure. The second convex wall of the first box panel and the second convex wall of the second box panel are docked and fixed to form the bottom wall of the box structure. The box panel bodies of the first box panel and the second box panel respectively form the front side wall and the rear side wall of the box structure.

5. The battery cell support according to claim 4, characterized in that: The first convex wall A, the first convex wall B and the second convex wall are respectively located at the left end, the right end and the lower end of the first box board or the second box board; The box plate body of the first box plate and the box plate body of the second box plate are respectively protruded from the first convex wall A and the first convex wall B, and the parts protruding from the first convex wall A and the first convex wall B are convex parts.

6. The battery cell support according to claim 1, characterized in that: The cover plate is fixed to the first box plate and the second box plate through the first convex wall.

7. A battery cell support according to claim 6, characterized in that: It also includes a connecting piece. A vertically arranged strip hole is formed on the first convex wall. The connecting piece passes through the strip hole and is fixed to the cover plate.

8. The battery cell support according to claim 1, wherein: A first convex wall is formed on the left end portion of the first box plate and the right end portion of the second box plate respectively; The first convex wall is formed with the connecting port; The first convex wall and the second convex wall have the same height.

9. A soft pack battery module, characterized in that: The battery cell comprises a battery cell and a battery cell bracket, wherein the battery cell is arranged inside the battery cell bracket, and the battery cell bracket is a battery cell bracket according to any one of claims 1 to 8.

10. The soft pack battery module according to claim 9, characterized in that: It also includes an EVA cotton buffer and an adapter plate, wherein the EVA cotton buffer is arranged between the battery core and the second convex wall and between the battery core and the cover plate; A through hole is formed on the adapter plate, and the adapter plate is arranged on the first convex wall and corresponding to the connecting port; The tabs of the battery cell pass through the connection port and the perforation in sequence and extend to the outside of the battery cell bracket.

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