Battery bracket and battery pack

Abstract

The utility model provides a battery support and a battery pack, the battery support is used for placing at least one cylindrical battery cell group, the cylindrical battery cell group comprises a plurality of cylindrical battery cells which are sequentially stacked in a first direction, and the battery support comprises a supporting plate and a limiting structure; the supporting plate is provided with a first surface for placing a plurality of cylindrical battery cells; the limiting structure and the supporting plate are integrally formed, the limiting structure comprises a plurality of protrusions arranged on the first surface in a protruding mode, the protrusions are arranged side by side at intervals in the first direction, every two adjacent protrusions correspondingly fix one cylindrical battery cell, and the side faces, facing the cylindrical battery cells, of the protrusions are matched with the outer walls of the cylindrical battery cells in shape; therefore, the grouping yield and the production efficiency of the battery pack can be improved; and moreover, the position deviation of the battery cells in the stacking direction can be reduced when the battery cells are stacked, so that the accumulated tolerance in the multi-battery-cell stacking process is reduced, and the risk of poor assembly in the battery pack grouping process is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a battery bracket and a battery pack. Background Technology

[0002] In pure electric vehicles, the battery system energy ranges from 50kWh to 120kWh. This means that battery systems used in pure electric vehicles require a greater number of cells. Taking a large cylindrical battery system as an example, multiple cylindrical cells are assembled using CTP (Continuously Variable Profile) technology. In this technology, when cylindrical cells are assembled using CTP, they need to be modularized and stacked. During the stacking process, the stacking tolerances of the cylindrical cells are usually controlled using tooling equipment. As a result, after the stacking and curing are completed, the stacked positions of the cylindrical cells may shift. As the number of stacked cylindrical cells increases, the cumulative shift of the cylindrical cells increases, which will affect the completion of subsequent welding processes, thereby increasing the risk of assembly defects in the battery system. Utility Model Content

[0003] The present invention provides a battery bracket and a battery pack, which can improve the technical problem of poor assembly of battery packs caused by large cumulative tolerances after stacking cylindrical cells.

[0004] In a first aspect, embodiments of the present invention provide a battery holder for supporting at least one cylindrical battery cell assembly, the cylindrical battery cell assembly comprising a plurality of cylindrical battery cells stacked sequentially in a first direction, the battery holder comprising:

[0005] A support plate having a first surface for supporting a plurality of the cylindrical cells; and,

[0006] A limiting structure is integrally formed with the support plate. The limiting structure includes a plurality of protrusions protruding from the first surface. The plurality of protrusions are arranged side by side at intervals in the first direction. Two adjacent protrusions are fixed to one cylindrical battery cell. The side of the protrusion facing the cylindrical battery cell is adapted to the shape of the outer wall of the cylindrical battery cell.

[0007] In one embodiment, the support plate further includes a plurality of pressure relief holes disposed on the first surface. The plurality of pressure relief holes are arranged side by side at intervals in the first direction. Each pressure relief hole is located between two protrusions, and each pressure relief hole corresponds to the position of one of the cylindrical battery cells.

[0008] In one embodiment, the support plate further includes a plurality of annular support platforms protruding from the first surface. Each annular support platform is provided corresponding to one of the pressure relief holes and is arranged around the periphery of the pressure relief hole. The end face of the annular support platform facing away from the first surface is used for placing the cylindrical battery cell.

[0009] In the first direction, the protrusion is located on the periphery of the corresponding annular support platform;

[0010] In the direction away from the first surface, the height of the protrusion is greater than the height of the annular support platform.

[0011] In one embodiment, the height of the protrusion is set to be greater than or equal to 5 mm and less than or equal to 6 mm in the direction away from the first surface.

[0012] In one embodiment, two adjacent protrusions enclose a limiting groove, and in a second direction, the two opposite sides of the limiting groove are open, the width of the open is smaller than the diameter of the cylindrical cell, and the second direction is intersecting the first direction.

[0013] The protrusion facing the side of the cylindrical battery cell forms the inner wall of the limiting groove.

[0014] In one embodiment, the side of the protrusion facing the cylindrical cell is configured as an arc surface, and the central angle of the arc surface is set to be greater than or equal to 45° and less than or equal to 60°.

[0015] In one embodiment, the protrusions extend in a direction away from the first surface, and along the direction away from the first surface, the two opposite sides of two adjacent protrusions are gradually spaced apart.

[0016] In one embodiment, each of the protrusions has a first end portion away from the first surface, and in the first direction, both sides of the first end portion are provided with chamfers.

[0017] In one embodiment, the battery holder further includes a buffer adhesive layer disposed on the first surface and filling at least between the protrusion and the cylindrical cell, and between two adjacent cylindrical cells.

[0018] In one embodiment, the support plate is used to hold a plurality of the cylindrical battery cell groups arranged along a second direction;

[0019] The battery bracket includes a plurality of limiting structures, which are arranged side by side in the second direction, and each limiting structure corresponds to limiting one cylindrical cell group.

[0020] In one embodiment, in the second direction, the protrusions in two adjacent limiting structures are staggered.

[0021] Secondly, embodiments of the present invention provide a battery pack, comprising:

[0022] The aforementioned battery holder, wherein the support plate of the battery holder has a first surface; and,

[0023] A cell module, comprising at least one cylindrical cell assembly placed on the first surface.

[0024] The beneficial effects of the embodiments of this utility model are as follows:

[0025] In an embodiment of this utility model, the battery bracket includes an integrally formed support plate and a limiting structure, which reduces the processing difficulty of the battery bracket. The first surface of the support plate is used to support multiple cylindrical cells, and multiple protrusions of the limiting structure protrude from the first surface of the support plate, with two adjacent protrusions corresponding to and fixing one cylindrical cell. Thus, when multiple cylindrical cells are stacked sequentially along the first direction, the protrusions can accurately pre-position each cylindrical cell, which not only improves the yield and production efficiency of battery pack assembly, but also reduces the positional offset in the stacking direction when cells are stacked, thereby reducing the cumulative tolerance during multi-cell stacking and reducing the risk of assembly defects during battery pack assembly. At the same time, when the battery pack is impacted, the fixing of the cylindrical cells by the protrusions can improve the stability of the cylindrical cell assembly in the first direction, thereby improving the battery pack's resistance to mechanical impact in the first direction. Furthermore, the fixing of the cylindrical cells by the protrusions can ensure the electrical clearance between adjacent cylindrical cells, thereby improving the safety performance of the battery pack. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is an axonometric view of the battery holder provided in an embodiment of this utility model;

[0028] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the image;

[0029] Figure 3 This is a front view of the battery holder provided in an embodiment of this utility model;

[0030] Figure 4 yesFigure 3 A magnified schematic diagram of part B in the image;

[0031] Figure 5 This is a top view of the battery holder provided in an embodiment of this utility model;

[0032] Figure 6 yes Figure 5 A magnified schematic diagram of part C in the image;

[0033] Figure 7 This is a perspective view of the battery pack provided in an embodiment of the present invention;

[0034] Figure 8 yes Figure 7 A magnified schematic diagram of part D in the image.

[0035] The names of the components corresponding to the corresponding reference numerals in the figure are:

[0036] 1000 Battery Pack; 100 Battery Bracket; 1 Support Plate; 11 First Surface; 12 Pressure Relief Hole; 13 Annular Support Platform; 2 Limiting Structure; 21 Protrusion; 211 Side; 212 First End; 22 Limiting Groove; 221 Inner Wall; 23 Opening; 24 Arc Surface; 25 Chamfer; 3 Buffer Adhesive Layer; 200 Cylindrical Cell Assembly; 201 Cylindrical Cell; 2011 Outer Wall; F1 First Direction; F2 Second Direction. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0038] Firstly, this utility model provides a battery holder 100. (See also...) Figure 1 , Figure 2 , Figure 7 as well as Figure 8The battery bracket 100 is used to support at least one cylindrical cell assembly 200. The cylindrical cell assembly 200 includes a plurality of cylindrical cells 201 stacked sequentially in a first direction F1. The battery bracket 100 includes a support plate 1 and a limiting structure 2. The support plate 1 has a first surface 11 for supporting the plurality of cylindrical cells 201. The limiting structure 2 is integrally formed with the support plate 1. The limiting structure 2 includes a plurality of protrusions 21 protruding from the first surface 11. The plurality of protrusions 21 are arranged side by side at intervals in the first direction F1. Two adjacent protrusions 21 are fixed to one cylindrical cell 201. The side 211 of the protrusion 21 facing the cylindrical cell 201 is adapted to the shape of the outer wall 2011 of the cylindrical cell 201.

[0039] In this application, a plurality of cylindrical battery cells 201 are placed on the first surface 11 of the support plate 1, and the limiting structure 2 is integrally formed on the first surface 11 to fix the plurality of cylindrical battery cells 201; the integral forming of the battery bracket 100 can reduce the processing difficulty of the battery bracket 100. Typically, the support plate 1 is made of plastic, and the support plate 1 and the limiting structure 2 are integrally formed by injection molding, further reducing the processing difficulty of the battery bracket 100.

[0040] Meanwhile, the limiting structure 2 includes a plurality of protrusions 21 protruding from the first surface 11. The plurality of protrusions 21 are arranged side by side at intervals in the first direction F1, and two adjacent protrusions 21 are fixed to one cylindrical cell 201. The side 211 of the protrusion 21 facing the cylindrical cell 201 is adapted to the shape of the outer wall 2011 of the cylindrical cell 201. That is to say, when the plurality of cylindrical cells 201 are stacked sequentially along the first direction F1, the protrusions 21 can accurately pre-position each cylindrical cell 201, which can not only improve the yield and production efficiency of the battery pack 1000 assembly, but also reduce the positional offset in the stacking direction when the cells are stacked, thereby reducing the cumulative tolerance in the process of multi-cell stacking, and thus reducing the risk of assembly defects when the battery pack 1000 is assembled.

[0041] It is known that one of the protrusions 21 will correspondingly fix two cylindrical cells 201 on its two sides, and the side 211 of the protrusion 21 facing the cylindrical cell 201 is adapted to the shape of the outer wall 2011 of the cylindrical cell 201. Therefore, in the first direction F1, the two side 211 of the protrusion 21 are adapted to the shape of the outer wall 2011 of the corresponding cylindrical cell 201, and the protrusion 21 is spindle-shaped.

[0042] Furthermore, each of the two adjacent protrusions 21 is fixed to a cylindrical cell 201. When the battery pack 1000 is impacted, the protrusions 21 will surround the portion of the cylindrical cell 201 near its bottom, thereby improving the stability of the cylindrical cell 201 in the first direction F1, increasing the fixing strength of the cylindrical cell 201, and thus improving the mechanical impact resistance of the battery pack 1000 in the first direction F1.

[0043] It is understood that when multiple cylindrical cells 201 are assembled using CTP technology, during subsequent use, as the adhesive between the cylindrical cells 201 ages and its adhesion decreases, the cylindrical cells 201 and the adhesive will crack at the bonding interface. Consequently, when the battery pack 1000 is subjected to impact, the poor stability of the cylindrical cells 201 can cause abrupt changes in the electrical clearance between adjacent cylindrical cells 201. The protrusion 21 improves the stability of the cylindrical cells 201, thereby ensuring that the electrical clearance between adjacent cylindrical cells 201 remains stable, and thus improving the safety performance of the battery pack 1000.

[0044] In an embodiment of this utility model, the battery holder 100 further includes a buffer adhesive layer 3, which is disposed on the first surface 11 and fills at least between the protrusion 21 and the cylindrical cell 201, as well as between two adjacent cylindrical cells 201. After stacking multiple cylindrical cells 201 onto the first surface 11, an adhesive injection process is required to form the buffer adhesive layer 3 between the protrusion 21 and the cylindrical cell 201, as well as between two adjacent cylindrical cells 201. This not only improves the stability of the multiple cylindrical cells 201, but also further ensures that the electrical clearance between adjacent cylindrical cells 201 remains stable, thereby improving the safety performance of the battery pack 1000.

[0045] This invention does not impose specific limitations on the distance between two adjacent cylindrical cells 201. The distance between two adjacent cylindrical cells 201 is not less than 2 mm. Optionally, the distance between two adjacent cylindrical cells 201 can be set to 2.2 mm, 2.4 mm, or 2.6 mm. Preferably, the distance between two adjacent cylindrical cells 201 is set to 2 mm. This setting can avoid short circuits between two adjacent cylindrical cells 201, and can also increase the density of the cylindrical cell group 200, thereby helping to improve the energy density of the battery pack 1000.

[0046] In the embodiments of this utility model, please refer to Figure 1 and Figure 2The support plate 1 also includes a plurality of pressure relief holes 12 disposed on the first surface 11. The plurality of pressure relief holes 12 are arranged side by side at intervals in the first direction F1. Each pressure relief hole 12 is located between two protrusions 21, and each pressure relief hole 12 corresponds to the position of one of the cylindrical cells 201.

[0047] A pressure relief hole 12 is provided at the position corresponding to the cylindrical cell 201, so that the explosion-proof valve of the cylindrical cell 201 can be exposed from the pressure relief hole 12 at the corresponding position; when the cylindrical cell 201 experiences thermal runaway, the high temperature and high pressure gas inside the cylindrical cell 201 overflows through the explosion-proof valve and flows out through the pressure relief hole 12; thereby improving the stability of the battery pack 1000.

[0048] It should be noted that you should refer to [link / reference]. Figure 4 Each pressure relief hole 12 is correspondingly provided with one cylindrical battery cell 201, therefore the distance L2 between two adjacent pressure relief holes 12 is not less than 2 mm. Optionally, the distance L2 between two adjacent pressure relief holes 12 is set to 2.2 mm, 2.4 mm, or 2.6 mm. Preferably, the distance L2 between two adjacent pressure relief holes 12 is set to 2 mm.

[0049] Furthermore, the pressure relief hole 12 is provided with protrusions 21 on both sides of its periphery in the first direction F1. When the protrusions 21 pre-position the cylindrical cell 201, they can also ensure that the explosion-proof valve of the cylindrical cell 201 is accurately aligned with the pressure relief hole 12, thereby ensuring the overall stability and safety performance of the battery pack 1000 when a single cylindrical cell 201 experiences thermal runaway.

[0050] To further improve the support stability of the battery bracket 100 for the cylindrical battery cell 201, please refer to... Figure 1 and Figure 2 The support plate 1 further includes a plurality of annular support platforms 13 protruding from the first surface 11. Each annular support platform 13 is provided corresponding to one of the pressure relief holes 12 and is arranged around the periphery of the pressure relief hole 12. The end face of the annular support platform 13 facing away from the first surface 11 is used for placing the cylindrical battery cell 201. In the first direction F1, the protrusion 21 is located on the periphery of the corresponding annular support platform 13. In the direction F3 facing away from the first surface 11, the height of the protrusion 21 is greater than the height of the annular support platform 13.

[0051] It is understood that the annular support platform 13 surrounding the pressure relief hole 12 is equivalent to forming a dam around the pressure relief hole 12. During the subsequent glue injection process, the annular support platform 13 can prevent glue from flowing out of the pressure relief hole 12, thereby improving the production yield of the battery pack 1000. Furthermore, the end face of the annular support platform 13 facing away from the first surface 11 is used to support the cylindrical cell 201, thus raising the elevation of the cylindrical cell 201. When the cylindrical cell 201 experiences thermal runaway, the high-temperature, high-pressure gas inside the cylindrical cell 201 overflows through the explosion-proof valve, flowing out sequentially through the annular support platform 13 and the pressure relief hole 12. At this time, the inner cavity of the annular support platform 13 and the pressure relief hole 12 together form a gas pressure relief channel, improving the pressure relief capacity of the support plate 1, thereby further improving the stability of the battery pack 1000.

[0052] Please also see Figure 3 and Figure 4 In the direction F3 away from the first surface 11, the height of the protrusion 21 is set to be greater than the height of the annular support platform 13; thus, when the cylindrical cell 201 is placed on the annular support platform 13, the protrusion 21 can still limit the cylindrical cell 201.

[0053] It is understood that the end face of the annular support platform 13 facing away from the first surface 11 is used to place the cylindrical battery cell 201, thereby raising the elevation of the cylindrical battery cell 201. Please refer to [link / reference]. Figure 6 Typically, the height H1 of the annular support platform 13 is set to be less than or equal to 3mm, as long as it can prevent glue from flowing out of the pressure relief hole 12 during the subsequent glue injection process.

[0054] This application does not impose a specific limitation on the height H1 of the annular support platform 13. The height H1 of the annular support platform 13 is set to 1.5mm, 2mm, 2.5mm or 3mm.

[0055] To ensure that the protrusion 21 can still limit the cylindrical battery cell 201, the height H2 of the protrusion 21 needs to be greater than the height H1 of the annular support platform 13; please refer to Figure 3 , Figure 4 as well as Figure 6In the direction F3 away from the first surface 11, the height H2 of the protrusion 21 is set to be greater than or equal to 5 mm and less than or equal to 6 mm. When the height H2 of the protrusion 21 is less than 5 mm, the height difference between the protrusion 21 and the annular support platform 13 is small, and the limiting effect of the protrusion 21 on the cylindrical battery cell 201 is poor. When the height H2 of the protrusion 21 is greater than 6 mm, the fixing effect of the protrusion 21 on the cylindrical battery cell 201 is good, but in the direction F3 away from the first surface 11, the gap formed between the protrusion 21 and the cylindrical battery cell 201 is deep. During the subsequent glue injection process, the glue has difficulty flowing in the narrow and deep gap, making it difficult for the glue to fill the gap, thereby reducing the contact area between the buffer glue layer 3 formed by the glue and the cylindrical battery cell 201.

[0056] In the direction away from the first surface 11, the height H2 of the protrusion 21 is set to be greater than or equal to 5 mm and less than or equal to 6 mm. On the one hand, this ensures the height difference between the protrusion 21 and the annular support platform 13, improving the limiting effect of the protrusion 21 on the cylindrical cell 201. On the other hand, it reduces the gap depth formed between the protrusion 21 and the cylindrical cell 201, facilitating the flow of adhesive in the gap, thereby allowing the adhesive to fill the gap, increasing the contact area between the buffer adhesive layer 3 formed by the adhesive and the cylindrical cell 201, and further improving the assembly stability of the cylindrical cell assembly 200.

[0057] This application does not impose a specific limitation on the height H2 of the protrusion 21. The height H2 of the protrusion 21 is set to 5mm, 5.2mm, 5.5mm, 5.7mm or 6mm.

[0058] In the embodiments of this utility model, please refer to Figure 4 and Figure 6 Two adjacent protrusions 21 enclose each other to form a limiting groove 22, and in the second direction F2, the two opposite sides of the limiting groove 22 are set with an opening 23. The width W of the opening 23 is smaller than the diameter D of the cylindrical cell 201. The second direction F2 and the first direction F1 are intersected. The side 211 of the protrusion 21 facing the cylindrical cell 201 forms the inner wall 221 of the limiting groove 22.

[0059] Following the above embodiment where "the protrusion 21 is spindle-shaped", two adjacent protrusions 21 enclose a circular limiting groove 22, and in the second direction F2, the two sides of the limiting groove 22 are open 23; the width W of the opening 23 formed by the two spindle-shaped protrusions 21 is smaller than the diameter D of the cylindrical cell 201, thereby further fixing the cylindrical cell 201 in the second direction F2, improving the stability of the cylindrical cell 201 in the second direction F2, improving the fixing strength of the cylindrical cell 201, and thus improving the mechanical impact resistance of the battery pack 1000 in the second direction F2.

[0060] Specifically, the side 211 of the protrusion 21 facing the cylindrical cell 201 is configured as an arc surface 24, and the central angle θ of the arc surface 24 is set to be greater than or equal to 45° and less than or equal to 60°. When the central angle θ of the arc surface 24 is set to be less than 45°, the opening 23 formed by the two spindle-shaped protrusions 21 is relatively large. When the battery pack 1000 is impacted, the protrusions 21 cannot limit the cylindrical cell 201 in the second direction F2. When the central angle θ of the arc surface 24 is set to be greater than 60°, it increases the difficulty of forming the protrusions 21.

[0061] This application does not impose specific limitations on the central angle θ of the arc surface 24. The central angle θ of the arc surface 24 can be set to 45°, 48°, 50°, 55°, or 60°.

[0062] As described above, two adjacent protrusions 21 enclose and form the limiting groove 22 to limit the cylindrical battery cell 201. When the cylindrical battery cells 201 are stacked, the protrusions 21 can also guide the cylindrical battery cells 201; please refer to Figure 5 and Figure 6 In one embodiment of this application, the protrusion 21 extends in a direction F3 away from the first surface 11, and along the direction F3 away from the first surface 11, the two opposite sides 211 of two adjacent protrusions 21 are gradually spaced apart. That is, in the direction F3 away from the first surface 11, two adjacent protrusions 21 enclose and form the limiting groove 22 with an flared opening, which facilitates the stacking of the cylindrical cells 201 and further improves the assembly yield and production efficiency of the battery pack 1000.

[0063] Please see Figure 5 and Figure 6In one embodiment of this application, each of the protrusions 21 has a first end 212 away from the first surface 11. In the first direction F1, chamfers 25 are provided on both sides of the first end 212. That is, by providing the chamfers 25 on both sides of the first end 212, two guide surfaces are formed on the protrusion 21, which facilitates the stacking of the cylindrical cells 201 and further improves the assembly yield and production efficiency of the battery pack 1000.

[0064] This application does not impose specific limitations on the chamfer 25. The chamfer 25 can be a rounded chamfer, and the guide surface can be an arc-shaped transition surface; the chamfer 25 can also be an oblique chamfer, and the guide surface can be a guide bevel.

[0065] Typically, the battery pack 1000 includes multiple cylindrical cell groups 200 arranged side-by-side along the second direction F2, and resting on the first surface 11 of the support plate 1. The battery bracket 100 includes multiple limiting structures 2 arranged side-by-side along the second direction F2, each limiting structure 2 corresponding to and limiting one cylindrical cell group 200. Thus, when multiple cylindrical cell groups 200 are stacked, the limiting structures 2 can accurately pre-position the multiple cylindrical cells 201 within each cylindrical cell group 200, which not only improves the assembly yield and production efficiency of the battery pack 1000, but also reduces the positional offset in the stacking direction during cell stacking, thereby reducing the cumulative tolerance during multi-cell stacking and lowering the risk of assembly defects when assembling the battery pack 1000.

[0066] It is understandable that in order to ensure the energy density of the battery pack 1000, it is necessary to increase the arrangement density of the multiple cylindrical cell groups 200; the density of the cylindrical cell group 200 is increased by setting the cells in two adjacent cylindrical cell groups 200 to be staggered in the second direction F2.

[0067] For the corresponding information, please refer to [link / reference]. Figure 4 and Figure 6 In the second direction F2, the protrusions 21 in two adjacent limiting structures 2 are staggered. By adjusting the position of the protrusions 21 in two adjacent limiting structures 2, while ensuring the density of the cylindrical cell assembly 200, the arrangement of the protrusions 21 can be made more reasonable, so that each limiting structure 2 corresponds to limiting one cylindrical cell assembly 200.

[0068] Secondly, embodiments of this application also provide a battery pack 1000. Please refer to... Figure 7 and Figure 8The battery pack 1000 includes a battery bracket 100 and a cell module; the support plate 1 of the battery bracket 100 has a first surface 11; the cell module includes at least one cylindrical cell assembly 200 resting on the first surface 11. It should be noted that the battery bracket 100 is configured as described above, meaning that the battery bracket 100 has all the technical features of the aforementioned battery bracket 100, and the battery pack 1000 includes all embodiments of the aforementioned battery bracket 100.

[0069] When multiple cylindrical cells 201 are stacked sequentially along the first direction F1, the protrusion 21 can accurately pre-position each cylindrical cell 201, which can not only improve the assembly yield and production efficiency of the battery pack 1000, but also reduce the positional offset of the cells in the stacking direction during stacking, thereby reducing the cumulative tolerance that occurs during the stacking of multiple cells, and thus reducing the risk of assembly defects when the battery pack 1000 is assembled.

[0070] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery holder for supporting at least one cylindrical cell assembly, the cylindrical cell assembly comprising a plurality of cylindrical cells stacked sequentially in a first direction, characterized in that, The battery holder includes: A support plate having a first surface for supporting a plurality of the cylindrical cells; and, A limiting structure is integrally formed with the support plate. The limiting structure includes a plurality of protrusions protruding from the first surface. The plurality of protrusions are arranged side by side at intervals in the first direction. Two adjacent protrusions are fixed to one cylindrical battery cell. The side of the protrusion facing the cylindrical battery cell is adapted to the shape of the outer wall of the cylindrical battery cell.

2. The battery holder according to claim 1, characterized in that, The support plate also includes a plurality of pressure relief holes disposed on the first surface. The plurality of pressure relief holes are arranged side by side at intervals in the first direction. Each pressure relief hole is located between two protrusions, and each pressure relief hole corresponds to the position of one of the cylindrical cells.

3. The battery holder according to claim 2, characterized in that, The support plate also includes a plurality of annular support platforms protruding from the first surface. Each annular support platform is provided corresponding to one of the pressure relief holes and is arranged around the periphery of the pressure relief hole. The end face of the annular support platform away from the first surface is used for placing the cylindrical battery cell. In the first direction, the protrusion is located on the periphery of the corresponding annular support platform; In the direction away from the first surface, the height of the protrusion is greater than the height of the annular support platform.

4. The battery holder according to claim 3, characterized in that, In the direction away from the first surface, the height of the protrusion is set to be greater than or equal to 5 mm and less than or equal to 6 mm.

5. The battery holder according to claim 1, characterized in that, Two adjacent protrusions enclose and form a limiting groove, and in the second direction, the two opposite sides of the limiting groove are open, the width of the opening is smaller than the diameter of the cylindrical cell, and the second direction is intersecting the first direction; The protrusion facing the side of the cylindrical battery cell forms the inner wall of the limiting groove.

6. The battery holder according to claim 5, characterized in that, The side of the protrusion facing the cylindrical battery cell is set as an arc surface, and the central angle of the arc surface is set to be greater than or equal to 45° and less than or equal to 60°.

7. The battery holder according to claim 1, characterized in that, The protrusions extend in a direction away from the first surface, and along the direction away from the first surface, the two opposite sides of two adjacent protrusions are gradually spaced apart.

8. The battery holder according to claim 1, characterized in that, Each of the protrusions has a first end portion away from the first surface, and in the first direction, both sides of the first end portion are provided with chamfers.

9. The battery holder according to claim 1, characterized in that, The battery bracket further includes a buffer adhesive layer disposed on the first surface and filling at least between the protrusion and the cylindrical cell, and between two adjacent cylindrical cells.

10. The battery holder according to any one of claims 2-9, characterized in that, The support plate is used to hold the plurality of cylindrical battery cell groups arranged along the second direction; The battery bracket includes a plurality of limiting structures, which are arranged side by side in the second direction, and each limiting structure corresponds to limiting one cylindrical cell group.

11. The battery holder according to claim 10, characterized in that, In the second direction, the protrusions in two adjacent limiting structures are staggered.

12. A battery pack, characterized in that, include: The battery holder as described in any one of claims 1-11, wherein the support plate of the battery holder has a first surface; and, A cell module, comprising at least one cylindrical cell assembly placed on the first surface.

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