Battery pack and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and a battery pack, the battery pack comprises single batteries and a cooling plate, the single batteries and the cooling plate are connected through an adhesive, and the thickness d of the adhesive is more than or equal to 0 and less than or equal to 2mm. By controlling the thickness of the adhesive, the occupied space of the battery pack in the battery pack can be reduced, and the space utilization rate in the pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly provides a battery pack and a battery module. 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 module, as the core part of the new energy device, has also been widely concerned. Generally, square shell battery cells, cylindrical battery cells or soft-pack battery cells are arranged in the current mainstream battery module.

[0003] In order to perform thermal management on the battery module, a cooling plate can be arranged between two rows of battery cells in the battery module to heat or cool the battery cells. Conventionally, generally, a heat-conducting adhesive is coated on the side surface of the cooling plate or a heat-conducting structure is arranged, and the battery cell is connected to the cooling plate through the heat-conducting adhesive or the heat-conducting structure.

[0004] However, the applicant has found through research that setting the heat-conducting adhesive by means of coating or arranging the heat-conducting structure between the cooling plate and the battery cell will result in low space utilization rate in the battery module.

[0005] Therefore, a new design is needed in this field to solve the above problems. Summary of the Utility Model

[0006] The utility model aims to solve the technical problem of low overall space utilization rate of the cylindrical battery module.

[0007] In a first aspect, the utility model provides a battery pack, which includes battery cells and a cooling plate. The battery cells and the cooling plate are connected through an adhesive, and the value range of the thickness d of the adhesive is: 0≤d≤2mm.

[0008] Optionally, the adhesive includes a first adhesive, and the value range of the thickness d1 of the first adhesive is: 0≤d1≤0.3mm.

[0009] Optionally, the adhesive includes a first adhesive and a second adhesive. The value range of the thickness d1 of the first adhesive is 0≤d1≤0.3mm, and the value range of the thickness d2 of the second adhesive is 0.3mm≤d2≤2mm.

[0010] Optionally, the value range of the thickness d of the second adhesive is 0.3mm≤d2≤1.5mm.

[0011] Optionally, the battery pack includes a first battery unit and a second battery unit, and both the first battery unit and the second battery unit include a plurality of battery cells and cooling plates; within the first battery unit and the second battery unit, the battery cells are connected to the cooling plates through a first adhesive; between the first battery unit and the second battery unit, the battery cells are connected to the cooling plates through a second adhesive.

[0012] Optionally, the first adhesive is disposed between the battery cells and the cooling plates through a dispensing process, and the second adhesive is disposed between the battery cells and the cooling plates through a coating process.

[0013] Optionally, the first adhesive includes at least one of the following: ultra-low viscosity acrylic, polyurethane, and epoxy resin adhesive.

[0014] Optionally, the second adhesive includes polyurethane and / or epoxy resin adhesive.

[0015] Optionally, the battery cells include cylindrical battery cells, and the shape of the side surface of the cooling plate matches the shape of the side surface of the cylindrical battery cells.

[0016] In a second aspect, the present application further provides a battery pack, which includes a box body and the battery pack according to any one of the above, and the battery pack is disposed within the box body.

[0017] In the case of adopting the above technical solution, within the battery pack provided by the present application, the battery cells and the cooling plates are connected through an adhesive, and the value of the thickness d of the adhesive is: 0 ≤ d ≤ 2 mm. Further, 0 ≤ d ≤ 0.3 mm. By controlling the thickness of the adhesive, the occupied space of the battery pack within the battery pack can be reduced, and the space utilization rate within the pack can be improved.

[0018] Further, some of the battery cells within the battery pack are connected to the cooling plates through a first adhesive with a very small thickness, and another part of the battery cells are connected to the cooling plates through a second adhesive with a larger thickness. Thus, according to the arrangement position between the battery cells and the cold plate, the gap therebetween can be reasonably set, the second adhesive is set at the place with a larger gap, and the first adhesive 201 is set at the place with a smaller gap. Thus, some space within the battery pack can be saved.

[0019] Further, using two rows or more of battery cells as a battery unit can facilitate the assembly of the battery pack. In addition, dividing the battery pack into multiple battery units can reduce the requirements for jigs and facilitate the assembly of the battery pack. The battery cells within the battery unit are bonded through a first adhesive 201 with a very small thickness, which can effectively reduce the occupied space of the battery unit. The battery units are bonded through a second adhesive with a larger thickness, which can enhance the connection strength between the battery units to improve the mechanical properties of the battery pack. Brief Description of the Drawings

[0020] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, in which:

[0021] Figure 1 is a top view of the first battery pack provided by the present utility model;

[0022] Figure 2 is a top view of the second battery pack provided by the present utility model;

[0023] Figure 3 is a schematic diagram of the third battery pack provided by the present utility model;

[0024] Figure 4 is a top view schematic diagram of a battery pack provided by the present utility model.

[0025] List of Reference Numerals:

[0026] 10, battery pack; 101, battery cell; 102, cooling plate; 20, adhesive; 201, first adhesive; 202, second adhesive; 100, battery unit; 30, box body, 40, main water pipe. Detailed Embodiments

[0027] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0028] It should be noted that in the description of the present utility model, 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 utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "set", "connected", "installed" 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 situations.

[0030] The following will be combined with Figures 1 to 4 to illustrate the battery pack and battery pack provided by the present utility model.

[0031] In a first aspect, please refer to Figure 1 , this application provides a first battery pack 10, which includes battery cells 101 and a cooling plate 102. The battery cells 101 and the cooling plate 102 are connected by an adhesive 20, and the value of the thickness d of the adhesive is: 0 ≤ d ≤ 2, unit: millimeter (mm).

[0032] Optionally, the cooling plate 102 is provided with flow channels for the coolant to flow through inside. The two sides of the cooling plate 102 are in contact with the sides of the battery cells 101. By heating or cooling the coolant in the cooling plate 102, the battery cells 101 can be heated or cooled to adjust the temperature of the battery cells 101.

[0033] It should be noted that the battery cells 101 mentioned in this application can be one or more of square shell battery cells, cylindrical battery cells or soft package battery cells. In the figures of this application, the cylindrical battery cells 101 are taken as an example for illustration, and the shape of the side surface of the cooling plate 102 matches the shape of the side surface of the cylindrical battery cells 102.

[0034] The cooling plate 102 matching the cylindrical battery cells 101 includes a plurality of arc segments (as Figure 1 shown), and the arc segments match the shape of the side surface of the cylindrical battery cells 101. Thus, the two rows of cylindrical battery cells 101 can be heated or cooled through the cooling plate 102 between the two rows of cylindrical battery cells 101. The matching of the shape of the side surface of the cooling plate 102 and the cylindrical battery 101 can be closely attached, which can effectively reduce the space occupied in the package and improve the space utilization rate in the package.

[0035] Optionally, the adhesive 20 can be a kind of glue or a mixture of multiple glues. For example, the adhesive includes at least one of the following: ultra-low viscosity acrylic acid, polyurethane, epoxy resin adhesive.

[0036] Thus, by controlling the thickness of the adhesive 20, the occupied space of the battery pack in the battery package can be reduced, and the space utilization rate in the package can be improved.

[0037] The following provides a specific Embodiment 1. Please refer to Figure 1 , Figure 1 , which is a top view of the first battery pack provided by the present utility model. Figure 1 In [the figure], the adhesive 20 is a first adhesive 201, and the value of the thickness d1 of the first adhesive is: 0 ≤ d1 ≤ 0.3 mm.

[0038] Among them, the first adhesive 201 includes at least one of the following: ultra-low viscosity acrylic acid, polyurethane, epoxy resin adhesive.

[0039] In Embodiment 1, each battery cell 101 in the battery pack 10 is connected to the cooling plate 102 through a first adhesive 201 with a very small thickness, which can effectively reduce the occupied space of the battery pack 10 in the battery case and improve the space utilization rate in the case.

[0040] In Embodiment 1, since the thickness of the first adhesive 201 between the battery cell 101 and the cooling plate 102 is very small, the battery cell 101 and the cooling plate 102 can be clamped by a fixture first to make the gap between them zero or have a small gap, and then glue (this glue is the first adhesive 201) is dropped between the battery cell 101 and the cooling plate 102, so that the battery cell 101 and the cooling plate 102 are bonded through the first adhesive 201.

[0041] Another specific Embodiment 2 is provided below. Please refer to Figure 2 , Figure 2 which is a top view of the second battery pack provided by the present utility model. The adhesive 20 may include a first adhesive 201 and a second adhesive 202. The value of the thickness d1 of the first adhesive ranges from 0 ≤ d1 ≤ 0.3 mm, and the value of the thickness d2 of the second adhesive ranges from 0.3 mm ≤ d2 ≤ 2 mm.

[0042] Preferably, the value of the thickness d2 of the second adhesive ranges from 0.3 mm ≤ d2 ≤ 1.5 mm.

[0043] Optionally, both the first adhesive 201 and the second adhesive 202 can be a kind of glue or a mixture of multiple glues. For example, the first adhesive 201 includes at least one of the following: ultra-low viscosity acrylic, polyurethane, and epoxy resin adhesive. The second adhesive 202 may include polyurethane and / or epoxy resin adhesive.

[0044] It should be noted that the adhesive 20, the first adhesive 201, and the second adhesive 202 include but are not limited to the above examples, and will not be elaborated here.

[0045] In Embodiment 2, some battery cells 101 in the battery pack are connected to the cooling plate 102 through a first adhesive 201 with a very small thickness, and the other part of the battery cells 101 are connected to the cooling plate 102 through a second adhesive 202 with a larger thickness. Thus, according to the arrangement position between the battery cell 101 and the cold plate 102, the gap between them can be reasonably set. The second adhesive 202 is set at the place with a larger gap, and the first adhesive 201 is set at the place with a smaller gap. This can save some space in the battery case.

[0046] Optionally, in Embodiment 2, the thickness of the first adhesive 201 is very small. First, the battery cell 101 and the cooling plate 102 can be clamped by a fixture to make the gap between them zero or have a small gap, and then glue (the glue is the first adhesive 201) is dropped between the battery cell 101 and the cooling plate 102, so that the battery cell 101 and the cooling plate 102 are bonded by the first adhesive 201. When setting the second adhesive 202, since the requirement for the gap is relatively low, the second adhesive 202 can be first applied on the battery cell 101 or the cooling plate 102, and then the battery cell 101 and the cooling plate 102 are bonded by the second adhesive 202. That is, the first adhesive 201 is set between the battery cell 101 and the cooling plate 102 through a glue dropping process, and the second adhesive 202 is set between the battery cell 101 and the cooling plate 102 through a glue coating process. Thus, the requirement for the fixture can be effectively reduced, facilitating the assembly of the components in the battery pack 10.

[0047] In a specific example of Embodiment 2, the battery pack 10 includes a plurality of battery units 100, and each battery unit includes a plurality of battery cells 101 and a cooling plate 102; within a single battery unit 100, the battery cell 101 and the cooling plate 102 are connected by a first adhesive 201; between different battery units 100, the battery cell 101 and the cooling plate 102 are connected by a second adhesive 202.

[0048] The following takes two battery units 100 (the first battery unit 100a and the second battery unit 100b) as an example for illustration.

[0049] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the third battery pack provided by the present invention, Figure 3 showing two battery units 100a and 100b. Each battery unit includes 2 rows of battery cells 101 and a wavy cooling plate 102 disposed between the 2 rows of battery cells 101. Inside each battery unit, the battery cells 101 on both sides of the cooling plate 102 are bonded to the cooling plate 102 by a first adhesive 201. A wavy cooling plate 102 is also provided between the two battery units 100a and 100b, and the battery cells 101 on both sides of this cooling plate 102 are bonded to this cooling plate 102 by a second adhesive 202. For Figure 3In an embodiment, a fixture for the battery cell 100 (including 100a and 100b) can be set. The fixture clamps two rows of battery monomers 101 and a cooling plate 102 disposed between the two rows of battery monomers 101, such that there is zero clearance or a small clearance between the battery monomers 101 and the cooling plate 102. Then, glue (the first adhesive 201) is dropped between the battery monomers 101 and the cooling plate 102, so that the battery monomers 101 and the cooling plate 102 are bonded through the first adhesive 201. After the internal bonding of both the battery cells 100a and 100b is completed, the second adhesive 202 is applied to the sides of the battery monomers 101 on the outer sides of the two battery cells (100a and 100b) through a gluing process, and the two battery cells (100a and 100b) are respectively bonded to both sides of the cooling plate 102.

[0050] It should be noted that the setting of the battery cell 100 includes but is not limited to Figure 3 For example, 3 rows or more rows of battery monomers 101 can also be used as a battery cell 100 to set the battery cell in this way, which will not be elaborated here.

[0051] Generally, a cooling plate 102 is set between two rows of battery monomers 101. In this embodiment, two rows or more rows of battery monomers 101 are used as the battery cell 100, which can facilitate the assembly of the battery pack 10. In addition, dividing the battery pack 20 into multiple battery cells 100 can reduce the requirements for the fixture and facilitate the assembly of the battery pack. The battery cell 100 is internally bonded through the first adhesive 201 with a very small thickness, which can effectively reduce the occupied space of the battery cell 100. The battery cells 100 are bonded through the second adhesive 202 with a larger thickness, which can enhance the connection strength between the battery cells 100 to improve the mechanical properties of the battery pack 10.

[0052] In a second aspect, the present application also provides a battery pack, which includes a box body 30 and the battery pack 10 described in any one of the above. The battery pack 10 is disposed inside the box body 30. Please refer to Figure 4 , Figure 4 which is a top view schematic diagram of a battery pack provided by the present utility model. Optionally, the box body 30 includes a lower box body formed by surrounding multiple side beams, an upper box cover, and a bottom plate. Figure 4 Only the lower box body is shown in

[0053] Optionally, the end of the cooling plate 102 can include a water inlet or a water outlet for connecting to the main water pipe 40 inside the battery pack to realize the coolant circulation loop inside the battery pack.

[0054] Optionally, the end of the cooling plate can further include a fixing portion for fixedly connecting to the battery pack box body 30.

[0055] In a third aspect, the present utility model further provides a vehicle, and the vehicle of the present utility model includes the above battery pack.

[0056] 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 the present application and forms different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0057] So far, the technical solutions of the present utility model have 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 fall within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, The battery pack includes battery cells and a cooling plate, and the battery cells and the cooling plate are connected by an adhesive. The value range of the thickness d of the adhesive is: 0 ≤ d ≤ 2 mm.

2. The battery pack according to claim 1, wherein, The adhesive includes a first adhesive, and the value range of the thickness d1 of the first adhesive is: 0 ≤ d1 ≤ 0.3 mm.

3. The battery pack according to claim 1, characterized in that, The adhesive includes a first adhesive and a second adhesive. The value range of the thickness d1 of the first adhesive is 0 ≤ d1 ≤ 0.3 mm, and the value range of the thickness d2 of the second adhesive is 0.3 mm ≤ d2 ≤ 2 mm.

4. The battery pack according to claim 3, wherein The value range of the thickness d2 of the second adhesive is 0.3 mm ≤ d2 ≤ 1.5 mm.

5. The battery pack according to claim 3, characterized in that, The battery pack includes a first battery unit and a second battery unit. Both the first battery unit and the second battery unit include a plurality of battery cells and a cooling plate. Inside the first battery unit and the second battery unit, the battery cells and the cooling plate are connected by a first adhesive. Between the first battery unit and the second battery unit, the battery cells and the cooling plate are connected by a second adhesive.

6. The battery pack according to any one of claims 3 to 5, characterized in that, The first adhesive is disposed between the battery cells and the cooling plate by a dispensing process, and the second adhesive is disposed between the battery cells and the cooling plate by a coating process.

7. The battery pack according to any one of claims 2 to 5, characterized in that, The first adhesive is an acrylic adhesive, or a polyurethane adhesive, or an epoxy resin adhesive.

8. The battery pack according to any one of claims 3 to 5, characterized in that, The second adhesive is a polyurethane adhesive or an epoxy resin adhesive.

9. The battery pack according to any one of claims 1 to 5, characterized in that, The battery cell includes a cylindrical battery cell, and the shape of the side surface of the cooling plate matches the shape of the side surface of the cylindrical battery cell.

10. A battery pack, characterized in that, The battery pack includes a box body and the battery pack according to any one of claims 1 to 9, and the battery pack is disposed inside the box body.

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