Battery pack and energy storage device with same

Abstract

The utility model discloses a battery pack and an energy storage device with the same. The battery pack comprises a heat dissipation plate, at least one battery cell module and a plurality of first restraining pieces, the battery cell module is arranged on the heat dissipation plate, the battery cell module comprises a plurality of battery cell units, and the plurality of battery cell units are arranged along a first direction; the plurality of first restraining pieces are respectively arranged at two ends of the battery cell module in a second direction, and the second direction is vertical to the first direction. According to the battery pack disclosed by the utility model, the plurality of first restraining pieces are arranged at the two ends of the battery cell module in the second direction, so that the number of parts is reduced, the grouping efficiency of the battery cell module is improved, the qualification rate and the production efficiency of the battery pack are improved, the structural stability and reliability of the battery cell module are enhanced, and the miniaturization design of the battery pack is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack and an energy storage device having the same. Background Art

[0002] In the prior art, during the fixing process of the battery cell unit, the multiple battery cells included in the battery cell unit are mainly fixed by two end plates at both ends of the length direction of the battery cell unit and a steel belt. Each battery pack is usually composed of 4 battery cell units, and each column of battery cells is connected in series or in parallel and fixed by the end plates at both ends to form a battery cell unit. The number of battery cells in each column of battery cell units is 12-15. When the number of battery cells included in each column of battery cell units exceeds 15, it is necessary to design a column of battery cell units into two 13 strings of battery cells in series, and end plates are provided at both ends of each 13 strings of battery cells, so that a column of battery cell units requires 4 end plates, which increases the length of the battery cell unit and the number of components of the battery pack, which is not conducive to the structural stability of the battery cell module and the miniaturized design of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack that reduces the number of parts, improves the grouping efficiency of the battery cell module, improves the qualified rate and production efficiency of the battery pack, enhances the structural stability and reliability of the battery cell module, and is conducive to the miniaturization design of the battery pack.

[0004] Another object of the present invention is to provide an energy storage device using the above-mentioned battery pack.

[0005] According to the battery pack of the embodiment of the first aspect of the utility model, it includes: a heat dissipation plate; at least one battery cell module, the battery cell module is arranged on the heat dissipation plate, the battery cell module includes a plurality of battery cell units, and the plurality of battery cell units are arranged along a first direction; a plurality of first restraints, the plurality of first restraints are respectively arranged at both ends of the battery cell module in a second direction, and the second direction is perpendicular to the first direction.

[0006] According to the battery pack of the embodiment of the utility model, a plurality of first restraints are arranged at both ends of the battery cell module in the second direction. Thus, compared with the traditional battery pack, the number of parts is reduced, the grouping efficiency of the battery cell module is improved, the qualified rate and production efficiency of the battery pack are improved, the structural stability and reliability of the battery cell module are enhanced, and the miniaturization design of the battery pack is facilitated.

[0007] According to some embodiments of the present invention, each of the battery cell units includes a plurality of battery cells, the plurality of battery cells are arranged along the second direction, and an elastic heat insulating member is provided between two adjacent battery cells.

[0008] According to some embodiments of the present invention, the number of the battery cells in each of the battery cell units is N, wherein N satisfies: 15≤N≤26.

[0009] According to some embodiments of the utility model, the battery pack also includes: at least one second restraint, which is sleeved on the outer periphery of the battery cell module, and provides restraint in multiple directions to the battery cell module, and at least one of the restraint in multiple directions is parallel to the first direction; a connecting member, which is arranged above the battery cell unit and connects two adjacent battery cells.

[0010] According to some embodiments of the present invention, at least one limiting groove is provided on the first restraining member, and the second restraining member is fitted in the limiting groove.

[0011] According to some embodiments of the present invention, the battery pack further includes: a thermally conductive structural adhesive, wherein the thermally conductive structural adhesive is disposed between the heat dissipation plate and the battery cell module.

[0012] According to some embodiments of the utility model, the battery pack further includes: a plurality of limit members, each of which is arranged on a side of the first restraint member away from the heat sink, the plurality of limit members are spaced apart along the first direction, and each of the limit members abuts against the battery cell module.

[0013] According to some embodiments of the utility model, a plurality of limit bars are provided on the heat sink, and the plurality of limit bars are respectively located on both sides of the heat sink in the second direction, and the battery cell module is located between the plurality of limit bars.

[0014] According to some embodiments of the present invention, the first restraint member is located on a side of the limiting strip away from the heat dissipation plate.

[0015] The energy storage device according to the embodiment of the second aspect of the utility model includes the battery pack according to the embodiment of the first aspect of the utility model.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 The enlarged view of the A part shown in the middle circle;

[0020] Figure 3 is a schematic diagram of a first restraining member and a limiting member of a battery pack according to an embodiment of the utility model;

[0021] Figure 4 is a schematic diagram of a battery cell module of a battery pack according to an embodiment of the utility model;

[0022] Figure 5 is a schematic diagram of an elastic heat insulating member of a battery pack according to an embodiment of the utility model;

[0023] Figure 6 is a schematic diagram of a battery pack according to an embodiment of the present utility model, wherein the heat sink is not shown.

[0024] Reference numerals:

[0025] 100. Battery pack;

[0026] 1. heat sink; 11. limit strip; 2. battery cell module; 21. battery cell unit; 211. battery cell; 2111. pole; 212. elastic thermal insulation member; 3. first restraint member; 31. mounting hole; 32. limit groove; 4. second restraint member; 5. connector; 6. thermal conductive structural adhesive; 7. limit member; 8. second connector. DETAILED DESCRIPTION

[0027] Reference below Figure 1-Figure 6 A battery pack 100 according to an embodiment of the first aspect of the present invention is described.

[0028] like Figure 1-Figure 6 As shown, the battery pack 100 according to the first embodiment of the utility model includes a heat dissipation plate 1, at least one battery cell module 2 and a plurality of first restraints 3.

[0029] Specifically, the battery module 2 is arranged on the heat dissipation plate 1, and the battery module 2 includes a plurality of battery cells 21. In the description of the utility model, "plurality" means two or more. The plurality of battery cells 21 are arranged along a first direction. The plurality of first restraints 3 are respectively arranged at both ends of the battery module 2 in a second direction, and the second direction is perpendicular to the first direction.

[0030] For example, in Figure 1-Figure 6 In the example of FIG. 1 , the width direction of the heat sink 1 (eg, Figure 1 The left-right direction in the figure is the first direction. The battery cell module 2 includes two battery cell units 21. The length direction of each battery cell unit 21 (for example, Figure 1 The front-to-back direction) and the length direction of the heat sink 1 (for example, Figure 1The number of the first restraints 3 of each battery cell module 2 can be two, and the two first restraints 3 are respectively located on both sides of the length direction of the battery cell module 2, and the first restraints 3 are stopped against the outer side of the battery cell module 2. The length of one first restraint 3 in the first direction is equal to the width of one battery cell module 2 in the first direction, that is, only one first restraint 3 is needed on each side of the length direction of one battery cell module 2. The first restraint 3 is respectively provided with a mounting hole 31 on both sides of the first direction, and the mounting hole 31 extends along the height direction of the first restraint 3, and the mounting hole 31 passes through the first restraint 3. The fastener can install the first restraint 3 on the heat sink 1 through the mounting hole 31 to fix the first restraint 3, which is conducive to the first restraint 3 to realize the restraint effect on the battery cell module 2, so that the structure of each battery cell 211 of the battery cell unit 21 is compact, and the qualified rate and production efficiency of the battery pack 100 are improved.

[0031] The first restraint 3 provides restraint for the multiple battery cells 211, which can prevent the battery cells 211 from dispersing, and keep the multiple battery cells 211 compact in the second direction, thereby enhancing the structural compactness of the battery cell unit 21, reducing the length of the battery cell module 2 in the second direction, saving the space occupied by the battery cell unit 21, and facilitating the miniaturization design of the battery pack 100. In addition, when the battery cell 211 swells during operation, the first restraint 3 can reduce the swelling of the battery cell 211 to prevent the battery cell module 2 from being deformed to a large extent, thereby extending the service life of the battery pack 100. Therefore, when the length of the battery cell unit 21 in the second direction is long, there is no need to add the first restraint 3 in the middle of the battery cell unit 21, thereby reducing the number of components of the battery pack 100.

[0032] In this way, a plurality of first restraints 3 are arranged at both ends of the second direction of the battery cell module 2, which can improve the grouping efficiency of the battery cell module 2, prevent the battery cell module 2 from being dispersed, reduce the number of parts, and is beneficial to improving the qualification rate and production efficiency of the battery pack 100, and enhance the structural stability and reliability of the battery cell module 2.

[0033] According to the battery pack 100 of the embodiment of the utility model, a plurality of first restraints 3 are provided at both ends of the second direction of the battery cell module 2. Thus, compared with the traditional battery pack, the number of components is reduced, the grouping efficiency of the battery cell module 2 is improved, the qualified rate and production efficiency of the battery pack 100 are improved, the structural stability and reliability of the battery cell module 2 are enhanced, and the miniaturization design of the battery pack 100 is facilitated.

[0034] According to some embodiments of the present invention, each battery cell unit 21 includes a plurality of battery cells 211, the plurality of battery cells 211 are arranged along the second direction, and an elastic heat insulating member 212 is disposed between two adjacent battery cells 211. Figure 1 , Figure 4 and Figure 5 , the length direction of the heat sink 1 (for example, Figure 1 The front-to-back direction in the drawing is the second direction. A plurality of battery cells 211 are stacked along the second direction to form a battery cell unit 21. An elastic heat insulating member 212 is provided between every two adjacent battery cells 211. The elastic heat insulating member 212 may be made of a synthetic foam material. The synthetic foam material has an independent bubble structure, low water absorption, and good elasticity.

[0035] The elastic properties of the elastic thermal insulation member 212 can solve the problem caused by the thickness difference of the battery cell 211 during the assembly process of the battery cell unit 21, and ensure that the length of each battery cell unit 21 in the second direction is consistent. The cumulative positive and negative tolerances of the length dimensions of the battery cell unit 21 in the second direction can be matched by relying on the high elasticity of the elastic thermal insulation member 212, thereby ensuring that the dimensional tolerance of each battery cell unit 21 in the second direction is controllable.

[0036] The thickness of the battery cell 211 is affected by the material properties of the battery cell 211 itself, and it will expand during use, causing the thickness of the battery cell 211 to increase. By setting an elastic heat insulating member 212 between two adjacent battery cells 211, there is no direct contact between the two adjacent battery cells 211. When the battery cell 211 expands, the increase in thickness will cause the elastic heat insulating member 212 to be compressed, and the width of the elastic heat insulating member 212 in the second direction will be reduced. The structure of the elastic heat insulating member 212 reserves space for the expansion of the battery cell 211, so that the battery cell module 2 will not be damaged during use due to the expansion of the battery cell 211, and the first restraint member 3 will not break and fail due to expansion. The change in the length of the battery cell unit 21 in the second direction can be reduced to ensure that the battery pack 100 can work normally and extend the service life of the battery pack 100.

[0037] In addition, when the battery pack 100 is working, the battery cell 211 will generate heat, and the elastic thermal insulation 212 can separate two adjacent battery cells 211 to reduce the heat transfer between the two adjacent battery cells 211. The elastic thermal insulation 212 meets the UL94V1 and UL94V0 fire protection level requirements, has good insulation and low thermal conductivity, and the thermal conductivity coefficient is less than 0.1W / mk. When the temperature of the battery cell 211 is high, the elastic thermal insulation 212 can effectively block or delay the diffusion and spread of thermal runaway and reduce the loss of the battery cell 211.

[0038] It should be noted that the elastic thermal insulation member 212 is a double-sided adhesive structure, and each surface of the elastic thermal insulation member 212 in the second direction is bonded and fixed to the battery cell 211 by double-sided adhesive, thereby enhancing the stability of the connection between the elastic thermal insulation member 212 and the battery cell 211.

[0039] According to some embodiments of the present invention, the number of the battery cells 211 in each battery cell unit 21 is N, where N satisfies: 15≤N≤26. Figure 1 and Figure 4 As shown, when the number of battery cells 211 is less than 15, the number of battery cells 211 is small, which reduces the capacity and service life of the battery pack 100, cannot meet the use requirements, and reduces the use experience of the battery pack 100. When the number of battery cells 211 is greater than 26, the number of battery cells 211 is large, which will increase the length of the battery cell unit 21, increase the difficulty of grouping the battery cell module 2, increase the length of the battery pack 100, and cannot load the battery pack 100 into the energy storage device of the standard size of the 20-foot cabinet. Therefore, by making the number of battery cells 211 of each battery cell unit 21 meet 15≤N≤26, it is beneficial to increase the capacity of the battery pack 100, extend the service life of the battery pack 100, and improve the grouping efficiency of the battery cell module 2, so as to facilitate the battery pack 100 to be loaded into the energy storage device of the standard size of the 20-foot cabinet to meet the 5WMh power of the energy storage device.

[0040] According to some embodiments of the present invention, the battery pack 100 further includes at least one second restraint member 4 and a connector 5. The second restraint member 4 is sleeved on the outer periphery of the battery module 2, and the second restraint member 4 provides restraint forces in multiple directions to the battery module 2, and at least one of the restraint forces in multiple directions is parallel to the first direction. The connector 5 is disposed above the battery cell unit 21, and the connector 5 connects two adjacent battery cells 211.

[0041] For example, in Figure 1 , Figure 2 and Figure 4 In the example, the second restraint member 4 extends along the circumference of the battery cell module 2, so that the second restraint member 4 can provide a restraining force at each position of the outer circumference of the battery cell module 2 to ensure that the structure of the battery cell module 2 remains stable and prevent the battery cell module 2 from dispersing. The number of the second restraint members 4 can be two, and the two second restraint members 4 are arranged at intervals along the third direction along the circumference of the battery cell module 2, and the height direction of the battery cell module 2 (for example, Figure 1 The up-down direction in the figure is the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. Thus, it is ensured that at least two battery cell units 21 are kept fixed to prevent the battery cell module 2 from spreading. It should be noted that the second restraint 4 can be made of steel belt or plastic steel belt.

[0042] The cross-section of the connector 5 is in the shape of a "J". The poles 2111 of the battery cell unit 21 are arranged in an upward direction. The connector 5 connects the poles 2111 of two adjacent battery cells 211. The two poles 2111 on one battery cell 211 can be connected to two different connectors 5, and the two different connectors 5 can respectively connect the one battery cell 211 with the two adjacent battery cells 211, that is, the two different connectors 5 extend in opposite directions on the one battery cell 211. The connector 5 is fixedly connected to the battery cell 211 by laser welding, so that the poles 2111 of the battery cell 211 and the connector 5 are melted into a whole, thereby realizing the fixation of the battery cell 211 in the third direction.

[0043] In this way, the battery cells 211 of the entire battery cell unit 21 are connected in sequence, so that the displacement of the battery cells 211 in the third direction is restricted, the structural stability of the battery cell unit 21 is increased, the battery cells 211 are prevented from being scattered, and the electrical connection between the battery cells 211 is facilitated.

[0044] According to some embodiments of the present invention, at least one limiting groove 32 is provided on the first restraining member 3, and the second restraining member 4 is fitted in the limiting groove 32. Figure 3 The limiting groove 32 is provided at the chamfer of the edge of the first restraining member 3 on one side in the first direction, and the limiting groove 32 is formed by the edge of the first restraining member 3 being recessed inward. When the second restraining member 4 is sleeved on the circumference of the battery cell module 2, the second restraining member 4 can pass through the limiting groove 32 so that the second restraining member 4 is fitted in the limiting groove 32.

[0045] like Figure 1 As shown, there are four limiting grooves 32, which are respectively arranged on both sides of the first restraining member 3 in the first direction, and the first restraining member 3 has two limiting grooves 32 on the same side of the first direction, and the two limiting grooves 32 on the same side are arranged at intervals along the third direction. In this way, when there are two second restraining members 4, each second restraining member 4 can cooperate with two limiting grooves 32, so that the second restraining member 4 cannot move in the third direction, which is conducive to the second restraining member 4 applying a restraining force to the battery module 2, increasing the restraining effect of the second restraining member 4, and is conducive to maintaining the structural stability of the battery module 2.

[0046] According to some embodiments of the present invention, the battery pack 100 further includes a thermally conductive structural adhesive 6, which is disposed between the heat sink 1 and the battery cell module 2. Figure 6As shown, the area of ​​the thermally conductive structural adhesive 6 needs to be greater than or equal to the cross-sectional area of ​​the battery cell module 2 in the second direction, and smaller than the cross-sectional area of ​​the heat sink 1. The material used for the thermally conductive structural adhesive 6 can be a two-component polyurethane, so that the thermally conductive structural adhesive 6 can be cured at room temperature or high temperature, and has good insulation withstand voltage characteristics and bonding stability after curing. Therefore, the thermally conductive structural adhesive 6 is coated on the heat sink 1, and then the battery cell module 2 is placed on the thermally conductive structural adhesive 6. After the thermally conductive structural adhesive 6 is cured, the battery cell module 2 can be fixed to the heat sink 1, limiting the freedom of the battery cell 211 in all directions on the heat sink 1, playing a strong bonding and fixing role, thereby enhancing the structural stability of the battery pack 100.

[0047] According to some embodiments of the present invention, the battery pack 100 further includes a plurality of stoppers 7, which are all disposed on a side of the first restraining member 3 away from the heat sink 1, and the plurality of stoppers 7 are spaced apart along the first direction, and each stopper 7 abuts against the battery cell module 2. Figure 2 and Figure 3 In the example, the stopper 7 is arranged on one side of the first restraining member 3 in the second direction. The number of the stopper 7 can be two, and the two stopper 7 are arranged on the first restraining member 3 along the first direction at intervals. The stopper 7 is fixedly connected to the second restraining member 4, and the stopper 7 and the adjacent battery cell 211 are fixedly connected through the second connecting member 8. One end of the second connecting member 8 is connected to one of the poles 2111 of the battery cell 211, and the other end of the second connecting member 8 is connected to the stopper 7.

[0048] Thus, the limiting member 7 can limit the displacement of the first restraining member 3 in the second direction and the third direction, prevent the first restraining member 3 from moving, and enhance the fixing effect on the battery module 2. The limiting member 7 is an insulating member.

[0049] According to some embodiments of the present invention, a plurality of limiting strips 11 are provided on the heat sink 1, and the plurality of limiting strips 11 are respectively located on both sides of the heat sink 1 in the second direction, and the battery module 2 is located between the plurality of limiting strips 11. Figure 1 The limiting strip 11 extends along the width direction of the heat sink 1. The number of limiting strips 11 can be two, and the two limiting strips 11 are respectively located on both sides of the length direction of the heat sink 1. The battery module 2 is located between the two limiting strips 11, and both sides of the length direction of the battery module 2 are stopped by the limiting strips 11, so that the limiting strips 11 limit the displacement of the battery module 2 in the second direction, prevent the battery module 2 from moving in the second direction, enhance the stability of the battery module 2, and ensure that the battery module 2 can work normally.

[0050] Furthermore, the first restraining member 3 is located on a side of the limiting strip 11 away from the heat sink 1. Figure 1As shown, the first restraint member 3 is placed above the limit strip 11, and the second restraint member 4 is also located above the limit strip 11. With this arrangement, the battery module 2 is abutted against the limit strips 11 on both sides of the second direction, saving the space occupied by the battery module 2 in the second direction. At the same time, the limit strip 11 has a certain supporting effect on the first restraint member 3, which facilitates the restraint of the first restraint member 3 and the battery module 2 by the second restraint member 4, further increasing the structural density of the battery unit 21, improving the stability of the battery unit 21, preventing the battery unit 21 from dispersing, and thus strengthening the fixation of the battery module 2.

[0051] The energy storage device (not shown) according to the embodiment of the second aspect of the utility model comprises the battery pack 100 according to the embodiment of the first aspect of the utility model.

[0052] The energy storage device according to the embodiment of the utility model can meet the capacity requirement of the energy storage device, i.e., the 5MWh power requirement, by adopting the above-mentioned battery pack 100, thereby improving the installation efficiency, saving the manufacturing cost of the energy storage device, and also reducing the transportation cost and saving the space occupied by the energy storage device.

[0053] Other structures and operations of the energy storage device according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0054] In the description of the present invention, it is necessary to understand that the terms "length", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0056] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Heat sink; At least one battery cell module, the battery cell module is arranged on the heat dissipation plate, the battery cell module includes a plurality of battery cell units, and the plurality of battery cell units are arranged along a first direction; A plurality of first restraining members are respectively arranged at two ends of the battery core module at a second direction, and the second direction is perpendicular to the first direction.

2. The battery pack according to claim 1, characterized in that: Each of the battery cell units includes a plurality of battery cells, the plurality of battery cells are arranged along the second direction, and an elastic heat insulating member is provided between two adjacent battery cells.

3. The battery pack according to claim 1, characterized in that: The number of the battery cells in each of the battery cell units is N, wherein N satisfies: 15≤N≤26.

4. The battery pack according to any one of claims 1 to 3, characterized in that: Also includes: At least one second restraining member, the second restraining member is sleeved on the outer periphery of the battery module, the second restraining member provides restraining forces in multiple directions to the battery module, and at least one of the restraining forces in the multiple directions is parallel to the first direction; A connecting piece is arranged above the battery cell unit, and the connecting piece connects two adjacent battery cells.

5. The battery pack according to claim 4, characterized in that: The first restraining member is provided with at least one limiting groove, and the second restraining member is fitted in the limiting groove.

6. The battery pack according to any one of claims 1 to 3, characterized in that: Also includes: Thermally conductive structural adhesive, the thermally conductive structural adhesive is arranged between the heat dissipation plate and the battery core module.

7. The battery pack according to any one of claims 1 to 3, characterized in that: Also includes: A plurality of limit members are provided on a side of the first restraining member away from the heat dissipation plate, the plurality of limit members are spaced apart along the first direction, and each of the limit members abuts against the battery cell module.

8. The battery pack according to any one of claims 1 to 3, characterized in that: The heat sink is provided with a plurality of limit bars, the plurality of limit bars are respectively located on both sides of the heat sink in the second direction, and the battery cell module is located between the plurality of limit bars.

9. The battery pack according to claim 8, characterized in that: The first restraining member is located on a side of the limiting strip away from the heat dissipation plate.

10. An energy storage device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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