Battery cell holder and battery pack

Abstract

The utility model provides a kind of electric core support and battery pack, the electric core support includes: body part;Multiple first support parts, set on the body part, each first support part is set as support one electric core;And multiple sealing parts, each sealing part is set on corresponding first support part, and it is suitable to be set between the first support part and the electric core, wherein, the sealing part has elasticity to make the sealing part be extruded after the electric core and seal the connecting gap between the electric core and the first support part.

Description

Technical Field

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

[0002] In related technologies, a battery pack includes multiple battery cells. The bottom of the multiple battery cells is fixed by a battery cell bracket, and the multiple battery cells are fixed together by foam. During the foaming process, the foam can easily penetrate into the gap between the battery cells and the battery cell bracket, making it difficult for the pressure relief valve at the bottom of the battery cell to release pressure. Utility Model Content

[0003] The present invention provides a cell support and battery pack, which can improve the technical problem of foam intrusion into the gap between the cell and the cell support, which makes it difficult for the pressure relief valve at the bottom of the cell to release pressure.

[0004] In a first aspect, embodiments of the present invention provide a battery cell support, the battery cell support comprising: a body portion; a plurality of first support portions disposed on the body portion, each of the first support portions being configured to support a battery cell; and a plurality of sealing portions disposed on a corresponding first support portion and adapted to be disposed between the first support portion and the battery cell, wherein the sealing portion is elastic so that the sealing portion, when squeezed by the battery cell, seals the connection gap between the battery cell and the first support portion.

[0005] In one embodiment, the sealing portion is configured as an annular foam, which is bonded to the first support portion.

[0006] In one embodiment, the compression ratio of the sealing part is greater than or equal to 33% when subjected to a compressive stress of not less than 4.3 kPa.

[0007] In one embodiment, the cell support includes a body portion, and the first support portion includes a circular boss, which is configured to protrude from the side surface of the body portion facing the cell; wherein the outer diameter of the circular boss is larger than the outer diameter of the cell.

[0008] In one embodiment, the top surface of each of the first support portions is provided with a first groove, and the sealing portion is received in the first groove; wherein the top surface of the first support portion and the sealing portion are adapted to support the battery cell.

[0009] In one embodiment, the depth of the first groove is less than the height of the sealing portion.

[0010] In one embodiment, the bottom surface of the first support portion is provided with a weak portion corresponding to the first groove, and the weak portion is configured to break when the battery cell is depressurized.

[0011] In one embodiment, the body portion is further provided with a glue flow channel, and at least a portion of the glue flow channel is disposed between two adjacent first support portions.

[0012] In one embodiment, the cell support further includes a plurality of second support portions, the first support portion and the second support portions being respectively disposed on both sides of the main body portion, and the plurality of second support portions being adapted to abut against the bottom plate of the battery pack.

[0013] In one embodiment, the main body is further provided with a glue flow channel, and the glue flow channel and the second support portion are respectively disposed on both sides of the main body, with the glue flow channel corresponding to the second support portion.

[0014] In one embodiment, the cell support is provided with a plurality of second grooves, the second grooves are located on two adjacent second support portions, and the groove walls of the plurality of second grooves and the bottom plate of the battery pack define a pressure relief cavity.

[0015] In one embodiment, the plurality of second grooves include multiple rows of second grooves spaced apart along the length of the housing, with adjacent rows of second grooves staggered.

[0016] Secondly, embodiments of the present invention provide a battery pack, the battery pack including a cell support, the cell support being configured as described above; and a plurality of cells, the plurality of cells being disposed on the cell support.

[0017] The beneficial effects of the embodiments of this utility model are as follows:

[0018] In an embodiment of this utility model, a sealing part is provided on the first support part of the battery cell bracket. The sealing part is located between the first support part and the battery cell, and the sealing part is elastic. After the battery cell is placed on the first support part of the battery cell bracket, the battery cell can compress the sealing part so that the sealing part seals the connection gap between the bottom end of the battery cell and the first support part, thereby making it difficult for the foam adhesive to enter the connection gap between the bottom of the battery cell and the first support part. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a three-dimensional structural diagram of the battery pack after the top plate has been removed, according to an embodiment of this utility model.

[0021] Figure 2 This is a three-dimensional structural diagram of a battery pack with multiple battery cells mounted on a battery bracket according to an embodiment of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the battery pack after potting, provided in an embodiment of this utility model.

[0023] Figure 4 This is a partial structural schematic diagram of the battery pack provided in an embodiment of the present invention;

[0024] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0025] Figure 6 This is a perspective view of the battery cell support provided in an embodiment of the present invention;

[0026] Figure 7 yes Figure 6 A magnified view of a portion of the image;

[0027] Figure 8 This is another perspective view of the battery cell support provided in an embodiment of this utility model;

[0028] Figure 9 yes Figure 8 A magnified view of a portion of the image;

[0029] Icon labels:

[0030] 100. Battery pack;

[0031] 1. Box body; 11. Side panel; 12. Bottom panel;

[0032] 2. Battery cells;

[0033] 3. Cell support; 31. Body part; 32. First support part; 321. First groove; 33. Sealing part; 34. Adhesive flow groove; 35. Second support part; 36. Second groove; 37. Weak part;

[0034] 4. Expanding foam; Detailed Implementation

[0035] 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.

[0036] In related technologies, a battery pack includes multiple battery cells. The bottom of the multiple battery cells is fixed by a battery cell bracket, and the multiple battery cells are fixed together by foam. During the foaming process, the foam can easily flow into the gap between the battery cell and the battery cell bracket. When the battery cell is set to bottom pressure relief, the gap between the battery cell and the battery cell bracket is usually set as a pressure relief chamber. When the foam blocks the pressure relief chamber, it will cause the bottom pressure relief valve of the battery cell to have difficulty in releasing pressure.

[0037] An embodiment of this application provides a battery pack 100, such as... Figures 1 to 3 As shown, the battery pack includes a housing 1, multiple battery cells 2, a cell support 3, and expanding foam 4. This battery pack can be a power battery pack or an energy storage battery pack. It may contain a single cell layer or multiple cell layers to increase the battery pack's capacity.

[0038] The enclosure 1 includes a top plate (not shown in the diagram), multiple side plates 11, and a bottom plate 12. The multiple side plates 11 are connected between the top plate and the bottom plate 12. The top plate is sealed to the top of the multiple side plates 11 through a sealing connection structure, and the bottom plate 12 is sealed to the bottom of the multiple side plates 11 through a sealing connection structure. Multiple battery cells 2 are housed and fixed inside the enclosure 1.

[0039] Multiple battery cells 2 can be cylindrical battery cells. These multiple battery cells 2 are arranged in a honeycomb pattern with staggered spacing inside the housing 1. The multiple battery cells 2 include multiple cell groups staggered along the width direction of the housing 1. Each cell group includes multiple battery cells 2 arranged side-by-side along the length direction of the housing 1. The width direction of the housing 1 is as follows: Figure 1 As shown in the y-direction, the length direction of box 1 is as follows: Figure 1 The x-direction is shown. Multiple cells 2 are arranged in a honeycomb staggered pattern, which helps to optimize energy density while taking into account heat dissipation and structural requirements.

[0040] Multiple battery cells 2 are fixed on the battery cell bracket 3 and encapsulated with expanding foam 4, which can significantly reduce the number of support structures in the battery pack and is conducive to the lightweight design of the battery pack.

[0041] In some embodiments, such as Figures 4 to 7 As shown, the cell support 3 is made of plastic material, which is beneficial for electrical insulation and the overall lightweight design of the battery pack.

[0042] The cell support 3 includes a body 31, a plurality of first support portions 32 and a plurality of sealing portions 33. Each first support portion 32 is configured to support a cell 2. Each sealing portion 33 is disposed on the corresponding first support portion 32. The sealing portion 33 is located between the first support portion 32 and the cell 2 and elastically abuts against the cell 2, so that the cell 2 compresses the sealing portion 33 under its own weight. This allows the sealing portion 33 to seal the connection gap between the bottom end face of the cell 2 and the first support portion 32 of the cell support 3. This makes it difficult for the foam 4 to enter the gap between the first support portion 32 and the cell 2 through the gap between the cell support 3 and the cell 2 during the potting process, and thus affects the depressurization process of the cell 2.

[0043] In one embodiment, such as Figure 6 and Figure 7 As shown, the first support portion 32 is configured as a circular boss structure. The plurality of first support portions 32 include multiple first support portion groups arranged along the width direction of the housing 1. Each first support portion group includes multiple first support portions 32 arranged along the length direction of the housing 1. Adjacent first support portion groups are staggered to facilitate the formation of a honeycomb-like staggered arrangement of the multiple battery cells 2. In other alternative embodiments, the first support portion 32 can be adaptively designed according to the shape of the battery cell 2 to stably support the battery cell 2.

[0044] In some embodiments, the sealing portion 33 is configured as an annular foam, which is bonded to the first support portion 32. The sealing portion 33 is bonded to the first support portion 32 using adhesive, thereby maintaining a stable connection between the sealing portion 33 and the first support portion 32. When the battery cell 2 is configured as a cylindrical structure, the contact surface between the battery cell 2 and the battery cell support 3 is typically configured as an annular contact surface. Configuring the sealing portion 33 as an annular foam structure and attaching it to the inner edge of the annular contact surface helps to effectively seal the connection gap between the battery cell 2 and the first support portion 32.

[0045] In some embodiments, when the sealing part 33 is subjected to a compressive stress greater than 4.3 kPa, the compression ratio of the sealing part 33 is not less than 33%, thereby enabling the sealing part 33 to undergo sufficient radial compression under the weight of the battery cell 2 to seal the connection gap between the bottom end face of the battery cell 2 and the first support part 32 of the battery cell bracket 3. It is understood that if the compression ratio of the sealing part 33 is set to less than 33% when subjected to a compressive stress greater than 4.3 kPa, the radial compression performance of the sealing part 33 will be insufficient, making it difficult to fully seal the connection gap between the battery cell 2 and the battery cell bracket 3.

[0046] In some embodiments, the cell support 3 includes a body portion 31, which has an upper surface and a lower surface disposed opposite to each other. The upper surface of the body portion 31 is positioned closer to the cell 2, and the lower surface of the body portion 31 is positioned away from the cell 2. A plurality of first support portions 32 are provided on the upper surface of the body portion 31, and the first support portions 32 are circular bosses protruding from the body portion 31.

[0047] The outer diameter of the circular boss is larger than the outer diameter of the cell 2. Specifically, the difference between the outer diameter of the circular boss and the outer diameter of the cell 2 is 0.5mm to 2mm. In specific embodiments, the difference between the outer diameter of the circular boss and the outer diameter of the cell 2 is 0.5mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, or any two of the above values, or a range between any two of the above values. It is understood that when the difference between the outer diameter of the circular boss and the outer diameter of the cell 2 is less than 0.5mm, it is not conducive to the stable fixation of the cell 2 on the circular boss, and it is easy to cause the spacing between two adjacent cells 2 to be too small, which is not conducive to insulation. When the difference between the outer diameter of the circular boss and the outer diameter of the cell 2 is greater than 2.0mm, it will lead to a reduction in the number of circular bosses that can be provided on the body part 31 of the cell support 3 of a considerable area, and correspondingly, a reduction in the number of cells 2, which is not conducive to the high capacity ratio design of the battery pack.

[0048] Multiple first support parts 32 are arranged in a honeycomb pattern and staggered on the upper surface of the main body 31. The multiple first support parts 32 include multiple sets of first support parts 32. Adjacent sets of first support parts 32 are staggered along the width direction of the box 1. Each set of first support parts 32 includes multiple first support parts 32 arranged side by side along the length direction of the box 1.

[0049] In some embodiments, a first groove 321 is provided on the top surface of each first support portion 32, and a sealing portion 33 is received in the first groove 321. The bottom end surface of the battery cell 2 abuts against the top surface of the first support portion 32 and the sealing portion 33, so that the first support portion 32 supports the bottom end surface of the battery cell 2, and the sealing portion 33 seals the connection gap between the battery cell 2 and the battery cell support 3.

[0050] In some embodiments, the depth of the first groove 321 is less than the height of the sealing part 33, so that the sealing part 33 protrudes from the top surface of the first groove 321, i.e. the top surface of the first support part 32, so that the sealing part 33 can abut against the bottom surface of the battery cell 2, and the battery cell 2 can compress the sealing part 33 under its own weight so that the sealing part 33 can fully seal the connection gap between the battery cell 2 and the battery cell bracket 3.

[0051] In one specific embodiment, the thickness of the sealing part 33 is set to 1.0mm to 2.0mm, and the depth of the first groove 321 is set to no more than 0.05mm, so that before the battery cell 2 is placed, the sealing part 33 protrudes from the top surface of the first groove 321, i.e., the top surface of the first support part 32, so that the battery cell 2 can fully compress the sealing part 33.

[0052] In some embodiments, such as Figures 6 to 9 As shown, the bottom surface of the first support portion 32 is provided with a weak portion 37 corresponding to the first groove 321. The weak portion 37 includes a circular groove to reduce the wall thickness of the weak portion 37. A pressure relief valve is provided on the bottom end face of the battery cell 2. The pressure relief valve is positioned opposite the first groove 321. When the pressure relief valve of the battery cell 2 is opened, the high-pressure airflow escaping from the inside of the battery cell 2 enters the first groove 321 and acts on the weak portion 37, causing the weak portion 37 to break and form a pressure relief port. The airflow then enters the bottom pressure relief space where the battery cell bracket 3 and the bottom plate 12 of the battery pack are located through the pressure relief port.

[0053] In some embodiments, such as Figure 6 and Figure 7 As shown, a glue flow groove 34 is provided around each first support portion 32 on the upper surface of the main body portion 31. The glue flow groove 34 is configured to accommodate foamed glue 4 so that the foamed glue 4 can flow on the cell support 3.

[0054] A glue-flowing groove 34 is provided on the upper surface of the main body 31. A portion of the glue-flowing groove 34 is located between two adjacent first support portions 32, so that the expanding foam 4 can fully fill the gap between two adjacent battery cells 2 and fix multiple battery cells 2 together by the expanding foam 4. Another portion of the glue-flowing groove 34 is provided near the edge of the main body 31 and partially surrounds the first support portion 32, so that the expanding foam 4 can fix the outer periphery of multiple battery cells 2.

[0055] In some embodiments, the adhesive flow channel 34 is located between two adjacent first support portions 32. The depth of the adhesive flow channel 34 is set to a range of 3mm to 9.3mm, and the width of the adhesive flow channel 34 is set to a range of 1mm to 8.5mm, thereby giving the adhesive flow channel 34 a suitable depth and width range to improve the problem of poor flowability of the foam adhesive between the battery cells. It is understood that if the depth of the adhesive flow channel 34 is set to less than 3mm and the width of the adhesive flow channel 34 is set to less than 1mm, the adhesive flow channel 34 will not have enough space to accommodate the foam adhesive, resulting in poor flowability of the foam adhesive between the battery cells 2. If the depth of the adhesive flow channel 34 is set to greater than 9.3mm and the width of the adhesive flow channel 34 is set to greater than 8.5mm, the adhesive flow channel 34 will occupy a large surface area of ​​the battery cell support 3 and will reduce the structural strength of the battery cell support 3.

[0056] Taking the first support part 32 as a circular boss as an example, the diameter of the circular boss is set to A, the interval between two adjacent circular bosses is d, and the interval d between two adjacent circular bosses is set to the distance between the centers of the two adjacent circular bosses. Then the width of the glue flow groove 34 located between the two circular bosses is equal to dA.

[0057] In some embodiments, continue to refer to Figures 6 to 9 The lower surface of the main body 31 of the cell support 3 is further provided with a plurality of second support portions 35. The plurality of second support portions 35 and the plurality of first support portions 32 are respectively located on both sides of the main body 31. The plurality of second support portions 35 abut against the bottom plate 12 of the battery pack to provide a support structure between the cell support 3 and the bottom plate 12. By integrating the support structure between the cell support 3 and the bottom plate 12 onto the cell support 3, the structural strength of the cell support 3 itself is strengthened, while the internal structure of the battery pack is simplified and assembly efficiency is improved. The plurality of second support portions 35 are also configured to support the module structure formed by the plurality of cells 2.

[0058] The second support portion 35 includes a shaped boss that protrudes from the lower surface of the main body portion 31. The top surface of each second support portion 35 is set as a plane so as to form a stable support surface with the base plate 12.

[0059] In some embodiments, the glue flow groove 34 located on one side of the body portion 31 is correspondingly provided with the second support portion 35 located on the other side of the body portion 31. The second support portion 35 is provided with a protruding structure, and the glue flow groove 34 is provided with a recessed structure. Providing the glue flow groove 34 and the second support portion 35 in a corresponding manner is beneficial to enhancing the overall structural strength of the cell support 3.

[0060] In some embodiments, a plurality of second grooves 36 are provided on the lower surface of the cell support 3. The plurality of second grooves 36 are staggered from the plurality of first grooves 321. The second grooves 36 are located between two adjacent second support portions 35. The groove walls where the plurality of second grooves 36 are located define a bottom pressure relief cavity with the bottom plate 12 of the battery pack, which is beneficial to increasing the volume of the bottom pressure relief cavity.

[0061] The second groove 36 is configured as an arc-shaped groove, and the bottom wall of the arc-shaped groove is configured as a raised structure on the upper surface of the body 31, which helps to increase the depth of the second groove 36 and increase the volume of the bottom pressure relief chamber.

[0062] In one specific embodiment, along the length of the housing, a plurality of second support portions 35 and a plurality of second grooves 36 are arranged at intervals, so that the bottom surface of the cell support 3 is provided with a plurality of second support portions 35 and a plurality of second grooves extending in a wave shape. Along the width of the housing, the second support portions 35 and the second grooves 36 in adjacent rows are arranged in a staggered manner, so that the plurality of second grooves 36 form a horizontal and vertical connection, thereby connecting the bottom pressure relief cavity defined by the plurality of second grooves 36, increasing the volume of the bottom pressure relief cavity, and thus improving the overall pressure relief capacity of the battery pack.

[0063] 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. An electrode holder, characterized by, The battery cell holder comprises: a body part; a plurality of first support parts arranged on the body part, each of the first support parts being arranged to support an electric cell; a plurality of sealing parts, each of the sealing parts being arranged on a corresponding first support part and adapted to be arranged between the first support part and the electric cell; wherein the sealing part is elastic so that the sealing part seals a connecting gap between the electric cell and the first support part after being pressed by the electric cell. The sealing part is arranged as a ring-shaped foam which is bonded to the first support part.

2. The cell holder of claim 1, wherein, The sealing part has a compression rate greater than or equal to 33% when subjected to a compressive stress of no less than 4.3 Kpa.

3. The cell holder of claim 1, wherein, The first support part comprises a circular boss which is arranged to protrude from a side surface of the body part towards the electric cell; wherein an outer diameter of the circular boss is greater than an outer diameter of the electric cell.

4. The cell holder of any one of claims 1 to 3, wherein, A top surface of each of the first support parts is provided with a first groove in which the sealing part is accommodated; wherein the top surface of the first support part and the sealing part are adapted to support the electric cell.

5. The cell holder of any one of claims 1 to 3, wherein, A depth of the first groove is less than a height of the sealing part.

6. The cell holder of claim 5, wherein, A bottom surface of the first support part is provided with a weak part corresponding to the first groove, the weak part being arranged to be broken when the electric cell is depressurized.

7. The cell holder of claim 5, wherein, The body part is further provided with a flow channel, at least part of the flow channel being arranged between two adjacent first support parts.

8. The cell holder of any one of claims 1 to 3, wherein, The battery cell holder further comprises a plurality of second support parts, the first support parts and the second support parts being arranged on two sides of the body part respectively, and the plurality of second support parts being adapted to abut against a bottom plate of a battery pack.

9. The cell holder of any one of claims 1 to 3, wherein, The body part is further provided with a flow channel, the flow channel and the second support parts being arranged on two sides of the body part respectively, and the flow channel and the second support parts being arranged correspondingly.

10. The cell holder of claim 9, wherein, The battery cell holder is provided with a plurality of second grooves, the second grooves being located between two adjacent second support parts, and the groove walls of the plurality of second grooves and the bottom plate of the battery pack defining a depressurization cavity.

11. The cell holder of claim 9, wherein, The plurality of second grooves comprise a plurality of rows of second grooves arranged along a width direction of the battery cell holder, and adjacent two rows of the second grooves are arranged in a staggered manner.

12. The cell holder of claim 11, wherein, The battery pack comprises:

13. A battery pack, characterized by a battery cell holder arranged as the battery cell holder according to any one of claims 1-12; a plurality of electric cells arranged on the battery cell holder. ​

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