Partition plate for cylindrical battery pack, battery pack and vehicle

Abstract

The utility model relates to the technical field of power batteries, in particular to a partition plate for a cylindrical battery pack, the battery pack and a vehicle, and the partition plate is arranged between two rows of cylindrical batteries; the partition plate comprises a main body and a fixing part, the main body is matched with the side surfaces of the plurality of cylindrical batteries in shape, and the fixing part is used for being connected with the box body. Therefore, the partition plate can be directly fixed on the battery pack box body, so that the space utilization rate in the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly provides a separator for a cylindrical battery pack, a battery pack and a vehicle. Background Art

[0002] At present, with the rapid development of the new energy industry, new energy devices such as electric vehicles and electric aircraft have been widely used, and the battery pack, as the core part of the new energy device, has also been widely concerned. Generally, square shell battery monomers, cylindrical battery monomers or soft package battery monomers are arranged in the current mainstream battery packs.

[0003] In the prior art, the cylindrical batteries are generally arranged in the battery pack in the following three ways:

[0004] Way 1: A plurality of cylindrical batteries are arranged in a module housing to form a cylindrical battery module, and then the cylindrical battery module is arranged in a battery pack box body.

[0005] Way 2: A limiting device is arranged at the top or bottom of a plurality of cylindrical batteries. For example, a plurality of round holes are arranged on a whole plate, and the cylindrical batteries can be arranged in the respective round holes for limiting, so as to fix the positions of the cylindrical batteries in the battery pack.

[0006] Way 3: The top or bottom of each cylindrical battery is directly bonded to the battery pack box body, and an end plate and a side plate are arranged between the cylindrical battery and the battery pack box body, and the cylindrical battery is limited by the end plate and the side plate.

[0007] However, the above methods all require a large amount of space inside the package, resulting in low overall space utilization rate of the cylindrical battery pack. Therefore, a new design is needed in the art to solve the above problems. Summary of the Utility Model

[0008] The utility model aims to solve the technical problem of low overall space utilization rate of the cylindrical battery pack.

[0009] In a first aspect, the utility model provides a separator for a cylindrical battery pack, and the separator is arranged between two rows of cylindrical batteries; the separator includes a main body and a fixing part, the main body is matched with the side shapes of a plurality of the cylindrical batteries, and the fixing part is used for connecting with a box body.

[0010] Optionally, the fixing part includes a stud.

[0011] Optionally, the height h1 of the stud and the height h2 of the cylindrical battery satisfy the following formula: h1 / h2 ≥ 1 / 4.

[0012] Optionally, the enveloping angle α of the main body with respect to the cylindrical battery is 50° to 100°.

[0013] Optionally, one end of each partition plate includes a fixing portion.

[0014] Optionally, the fixing portions of two adjacent partition plates are provided at two different ends.

[0015] Optionally, the partition plate includes a cooling plate.

[0016] In a second aspect, the present utility model further provides a battery pack, which includes a box body, and a plurality of cylindrical batteries and any one of the above partition plates for a cylindrical battery pack are arranged in the box body.

[0017] Optionally, potting glue is filled between the box body and the fixing portion of the partition plate.

[0018] In a third aspect, the present utility model further provides a vehicle, which includes the battery pack according to any one of the above.

[0019] In the case of adopting the above technical solutions, the partition plate provided by the present utility model includes a main body and a fixing portion. The main body is matched with the side shapes of a plurality of cylindrical batteries, and the fixing portion is used for connecting with the box body. Thus, the partition plate can be directly fixed on the battery pack box body. The cylindrical batteries are limited by the partition plates between two rows of cylindrical battery cores, and the cylindrical batteries are fixed within the battery pack box body. Since the main body of the partition plate is matched with the shape of the cylindrical batteries, the space occupied inside the pack can be effectively reduced, and the space utilization rate inside the pack can be improved.

[0020] Furthermore, each cylindrical battery is fixed to both sides of the main body of the partition plate by means of gluing or the like. Thus, the cylindrical batteries can be fixed within the battery pack box body. In addition, the gaps between the plurality of cylindrical batteries and the gaps between the cylindrical batteries and the partition plate can be filled with potting glue or other potting materials, thereby forming an integral body of the plurality of partition plates and the plurality of cylindrical batteries inside the battery pack to improve the mechanical properties of the battery pack.

[0021] Furthermore, each partition plate is provided with a fixing portion only at one end, which can save the space inside the battery pack. The fixing portions of two adjacent partition plates are arranged at two different ends, which can ensure uniform force at both ends of the battery pack.

[0022] Furthermore, when the contact area between the main body of the partition plate and each cylindrical battery becomes larger, the fixing area for the cylindrical batteries inside the battery pack can be increased, and the mechanical properties of the cylindrical battery pack can be better improved.

[0023] Furthermore, the partition plate includes a cooling plate (which can also be called a cold plate), and a flow channel for the coolant to flow is provided inside the cooling plate. The main body of the cooling plate contacts the side surfaces of the cylindrical batteries. By heating or cooling the coolant inside the cooling plate, the cylindrical batteries can be heated or cooled to adjust the temperature of the cylindrical batteries.

[0024] Furthermore, when the contact area between the main body of the cooling plate and each cylindrical battery increases, the heating or cooling area of the cylindrical batteries in the battery pack can be increased, and the thermal management efficiency in the battery pack can be improved. Description of the Drawings

[0025] The preferred embodiments of the present invention will be described below with reference to the drawings, in which:

[0026] Figure 1 is a schematic diagram of the first separator provided by the present invention;

[0027] Figure 2 is a schematic diagram of the second separator provided by the present invention;

[0028] Figure 3 is a top view of the third separator provided by the present invention;

[0029] Figure 4 is a top view of a cylindrical battery pack provided by the present invention;

[0030] Figure 5 is a front view of a cylindrical battery pack provided by the present invention.

[0031] List of Reference Numerals:

[0032] 10. Separator; 11. Main body of the separator; 111. First arc segment of the main body of the separator; 112. Second arc segment of the main body of the separator; 12. Fixing part of the separator; 13. Water inlet or outlet of the cooling plate; 20. Cylindrical battery; α. Enveloping angle of the main body with respect to the cylindrical battery; 30. Battery pack box. Detailed Embodiments

[0033] The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be noted that in the description of the present invention, the terms "inner", "outer", "upper", "lower", "top", "bottom", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "arrangement", "connection", and "installation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] The following will be combined with Figures 1 to 5 to illustrate the separator, battery pack and vehicle for cylindrical battery packs provided by the present utility model. Figure 1 is a schematic diagram of the first separator provided by the present utility model;

[0037] Figure 2 is a schematic diagram of the second separator provided by the present utility model; Figure 3 is a top view of the third separator provided by the present utility model; Figure 4 is a top view of a cylindrical battery pack provided by the present utility model; Figure 5 is a front view of a cylindrical battery pack provided by the present utility model.

[0038] In a first aspect, the present utility model provides a separator 10 for a cylindrical battery pack. The separator 10 is arranged between two rows of cylindrical batteries 20. The separator 10 includes a main body 11 and a fixing part 12. The main body 11 matches the side shape of a plurality of cylindrical batteries 20, and the fixing part 12 is used to connect with the box body 30 (abbreviated as the box body) of the battery pack.

[0039] Thus, the cylindrical batteries can be limited by the separator 10 between two rows of cylindrical battery cells 20, and the cylindrical batteries 20 can be fixed within the battery pack box body 30. Since the main body 11 of the separator 10 matches the shape of the cylindrical batteries 20, the space occupied inside the pack can be effectively reduced, and the space utilization rate inside the pack can be improved.

[0040] Optionally, after the separator 10 is arranged, the end plate and / or side plate between the cylindrical battery 20 and the battery pack box body 30 can be cancelled. Preferably, the end plate (which can also be called the side plate) arranged parallel to the separator 10 can be cancelled. Thus, the space utilization rate inside the pack is further improved.

[0041] Optionally, potting glue is filled between the battery pack box body 30 and the fixing part 12 of the separator 10. This can avoid the direct contact between the battery pack box body 30 and the fixing part 12 of the separator 10 and has a buffering effect.

[0042] Among them, inside the inner box body 30 of the battery pack, a plurality of cylindrical batteries 20 are arranged. The two sides of the main body of the separator 10 are respectively close to two rows of cylindrical batteries 20, and the main body 11 can be designed into Figures 1 to 4 the wavy shape in [description], and the two sides of the main body 11 match the curved surface shape of the cylindrical batteries 20.

[0043] Optionally, two sides of the partition plate 10 are adhesively connected to two rows of cylindrical batteries 20 respectively, and the adhesive can be double-sided adhesive, various glues, etc.

[0044] A fixing part 12 is arranged on the partition plate 10, and the partition plate 10 is connected to the box body 30 through the fixing part 12. Each cylindrical battery 20 is fixed to both sides of the main body of the partition plate 10 by means of adhesive bonding or the like. Thus, the cylindrical batteries 20 can be fixed in the battery pack box body 30. In addition, the gaps between the plurality of cylindrical batteries 20 and the gaps between the cylindrical batteries 20 and the partition plate 10 can be filled with potting glue or other potting materials, thereby forming an integral body of the plurality of partition plates and the plurality of cylindrical batteries 20 in the battery pack to improve the mechanical properties of the battery pack. Among them, the potting glue can include foaming glue and / or non-foaming glue. Preferably, most of the potting glue is foaming glue, and the density of the foaming glue is less than that of the partition plate 10. Thus, the weight of the battery pack can be effectively reduced, and the battery pack can be lightened.

[0045] In a specific embodiment, the end plate (side plate) between the cylindrical battery 20 and the battery pack box body 30 is cancelled, and the whole circumference of the plurality of cylindrical batteries 20 and the partition plate 10 is coated with a buffer member and then directly arranged in the battery pack box body 30. Optionally, the buffer member can include potting glue, foam, silica gel, etc.

[0046] Thus, while improving the space utilization rate in the battery pack, the buffer member is used to prevent the external force from impacting the cylindrical batteries in the pack, thereby improving the safety of the battery pack.

[0047] In one embodiment, the fixing part 12 can be arranged at two ends of the partition plate 10, and these two ends are not connected to the cylindrical battery 20. Thus, after the main body 11 of the partition plate 10 is fixedly connected to the plurality of cylindrical batteries 20, the partition plate 10 and the plurality of cylindrical batteries 20 can be regarded as an integral body. Through the fixing part 12 of the partition plate 10, this integral body is fixedly connected to the battery pack box body 30. Thus, it is convenient for this integral body to be put into the box and installed.

[0048] Furthermore, a fixing part 12 is arranged at one end of each partition plate 10. That is, only one end of each partition plate 10 is fixedly connected to the box body 30.

[0049] Furthermore, a plurality of parallel partition plates are arranged in the battery pack, such as Figure 4 and Figure 5As shown, a fixing portion 12 is provided at one end of each partition plate 10. Moreover, the fixing portions 12 of two adjacent partition plates 10 are provided at two different ends. Specifically, two adjacent partition plates 10 are respectively denoted as a first partition plate 10a and a second partition plate 10b, and the fixing portion 12 of the second partition plate 10b ( Figure 4 and Figure 5 as shown in) is fixed to the first end 30a of the battery pack housing 30, and the fixing portion of the second partition plate 10b ( Figure 4 and Figure 5 not shown in) is provided at the second end of the battery pack housing 30 ( Figure 4 and Figure 5 not shown in). Each partition plate 10 is provided with a fixing portion 12 only at one end, which can save space inside the battery pack. The fixing portions of two adjacent partition plates 10 are provided at two different ends, which can ensure uniform force at both ends of the battery pack.

[0050] Optionally, each partition plate 10 may include one or more fixing portions 12. The number of fixing portions 12 included in each partition plate 10 may be the same. For example, each partition plate 10 includes 1 fixing portion 12; the number of fixing portions 12 included in each partition plate 10 may also be different. For example, one partition plate 10 includes 1 fixing portion 12, and another partition plate 10 includes 3 fixing portions 12. The number of fixing portions 12 included in each partition plate 10 may be set according to at least one of the following features: the shape or size of this partition plate 10; the position of this partition plate 10 inside the battery pack; the requirement for connecting this partition plate 10 to the battery pack housing 30.

[0051] In one embodiment, the battery pack housing 30 includes a lid, a lower housing ( Figure 4 and Figure 5 the battery pack housing 30 in refers to the lower housing), and a bottom plate. The lower housing includes a plurality of side walls connected end to end. The lid and the bottom plate are respectively covered on two sides of the lower housing. Thus, a sealed cavity is formed inside the battery housing 30, and this cavity is used to place a plurality of cylindrical batteries 20.

[0052] In a specific embodiment, the fixing portion 12 of the partition plate 10 is connected to the lower housing 30, that is, the partition plate 10 is fixed to the lower housing of the battery pack. In another specific embodiment, the fixing portion 12 of the partition plate 10 is connected to the bottom plate, that is, the partition plate 10 is fixed to the bottom plate. In yet another specific embodiment, the fixing portions 12 of some partition plates 10 are connected to the lower housing, and the fixing portions 12 of other partition plates 10 are connected to the bottom plate.

[0053] Optionally, the partition plate 10 and the battery pack housing 30 can be connected by at least one of the following connection methods: threaded connection, flange connection, welding, groove connection (clamp connection), ferrule connection, press connection, and bonding. Correspondingly, the fixing portion 12 can include any structure for implementing the above connection methods. For example, if the partition plate 10 and the battery pack housing 30 are connected by threaded connection, the fixing portion 12 of the partition plate 10 can include screws or bolts for implementing threaded connection, and the battery pack housing 30 includes corresponding threaded holes; or the fixing portion 12 of the partition plate 10 can include threaded holes for implementing threaded connection, and the battery pack housing 30 includes corresponding screws or bolts.

[0054] In one embodiment, the partition plate 10 is used to fix two rows of cylindrical batteries 20 bonded thereto in the battery pack housing 30. The inventor has found through research that when the contact area between the main body 11 of the partition plate 10 and each cylindrical battery 20 increases, the fixing area of the cylindrical batteries 20 in the battery pack can be increased, and the mechanical properties of the cylindrical battery pack can be better improved.

[0055] In one embodiment, the partition plate 10 includes a cooling plate (which can also be called a cold plate), and a flow channel for the coolant to flow is provided inside the cooling plate. The main body of the cooling plate (i.e., the main body 11 of the partition plate) is in contact with the side surface of the cylindrical battery 20. By heating or cooling the coolant in the cooling plate, the cylindrical battery 20 can be heated or cooled to adjust the temperature of the cylindrical battery 20. Optionally, the cooling plate and the cylindrical battery 20 are connected by a thermal conductive adhesive to improve the heat transfer efficiency. When the contact area between the main body 11 of the cooling plate and each cylindrical battery 20 increases, the heating or cooling area of the cylindrical batteries 20 in the battery pack can be increased, and the thermal management efficiency in the battery pack can be improved.

[0056] Optionally, the end of the cooling plate can include a water inlet or a water outlet 13, which is used to connect to the main water pipe in the battery pack to realize the coolant circulation loop in the battery pack.

[0057] In one embodiment, the main body 11 of the partition plate 10 can be a corrugated partition plate with a uniform thickness, and its manufacturing process is simpler.

[0058] In one embodiment, the main body 11 of the partition plate 10 can also be a corrugated partition plate with a non-uniform thickness. In a specific embodiment, please refer to Figure 3, the main body 11 includes a plurality of arc segments connected end to end, thereby forming a wavy partition. Among them, the plurality of arc segments may include a first arc segment 111 and a second arc segment 112. Two second arc segments 112 are arranged on both sides of the first arc segment 111, and the two second arc segments 112 are smoothly connected to the two ends of the first arc segment 111 respectively to form an arc surface. Among them, the cross-sectional thickness of each part of the first arc segment 111 is equal, and the cross-sectional thickness of the second arc segment 112 increases in sequence from the end far away from the first arc segment 111 to the end close to the first arc segment 111. Thereby, the contact area between the cylindrical battery 20 and the main body 11 can be increased, and the wrapping angle α of the main body 11 with respect to the cylindrical battery 20 is increased. Specifically, the wrapping angle α is 50° to 100°. Further, the wrapping angle α is 57° to 100°.

[0059] Among them, a part of the cylindrical battery 20 is in contact with the main body 11, and the arc surface of the cylindrical battery 20 is tangent to the main body 11 at two points C and D. Denote the center point of the cylindrical battery 20 as O, and the connecting lines between the two tangent points (point C and point D) and the center point (point O) of the cylindrical battery 20 are OC and OD. The included angle between OC and OD is α, then the wrapping angle of the main body 11 with respect to the cylindrical battery 20 is ∠COD, that is, α.

[0060] It should be noted that, in addition to the above embodiments, other methods can also be used to adjust the thickness of the main body 11 of the separator 10, thereby increasing the contact area between the main body 11 and a single cylindrical battery 20, which will not be elaborated here.

[0061] In one embodiment, as Figure 1 and Figure 2 shown, the fixing part 12 includes a stud, which can be connected to the box body by bolts or screws.

[0062] As Figure 2 shown, the height h1 of the stud and the height h2 of the cylindrical battery 20 satisfy the following formula: h1 / h2 ≥ 1 / 4. That is to say, the stud (i.e., the fixing part 12) is heightened so that the height of the stud is greater than or equal to 1 / 4 of the height of the cylindrical battery 20 to improve the mechanical properties of the connection between the separator 10 and the battery pack box body.

[0063] In a second aspect, the present invention further provides a battery pack, which includes a box body 30, and a plurality of cylindrical batteries 20 and the separator 10 described in any one of the above are arranged in the box body 30.

[0064] For the description of the battery pack and the box body 30, reference can be made to the above description, which will not be elaborated here.

[0065] In a third aspect, the present invention further provides a vehicle. The vehicle of the present invention includes the above battery pack.

[0066] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of this application and forms different embodiments. For example, in the claims of this application, any one of the claimed embodiments can be used in any combination.

[0067] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A separator for a cylindrical battery pack, characterized in that: The partition plate is arranged between two rows of cylindrical batteries; The partition plate includes a main body and a fixing portion, wherein the main body matches the side shape of the cylindrical battery, and the fixing portion is used to be connected to the box body.

2. The partition plate according to claim 1, characterized in that The fixing portion includes a stud.

3. The partition plate according to claim 2, characterized in that: The height h1 of the stud and the height h2 of the cylindrical battery satisfy the following formula: h1 / h2>=1 / 4.

4. The partition plate according to any one of claims 1 to 3, characterized in that: An envelope angle α of the main body to the cylindrical battery is 50° to 100°.

5. The partition plate according to any one of claims 1 to 3, characterized in that: One end portion of each partition plate includes a fixing portion.

6. The partition plate according to claim 5, characterized in that The fixing portions of two adjacent partition plates are arranged at two different end portions.

7. The partition plate according to any one of claims 1 to 3, characterized in that: The separator plate includes a cooling plate.

8. A battery pack, characterized in that: The battery pack includes a box body, in which a plurality of cylindrical batteries and a separator for a cylindrical battery pack according to any one of claims 1 to 7 are arranged.

9. The battery pack according to claim 8, characterized in that: A potting glue is filled between the box body and the fixing portion of the partition plate.

10. A vehicle, characterized in that: The vehicle comprises the battery pack as claimed in claim 8 or 9.

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