Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device. The battery pack comprises at least two layers of battery cells and a separation part connected between the two adjacent layers of battery cells, the battery cells are square battery cells with side-out poles, the battery cells on the same layer are arranged in parallel, and an included angle is formed between the projections of the length directions of the battery cells on the separation part of two adjacent layers. According to the battery pack disclosed by the utility model, by changing the arrangement mode of the battery cells, the projections of the two adjacent layers of battery cells on the separation part form an included angle, so that the battery cells can be opposite to at least two adjacent layers of battery cells, and when the battery pack is subjected to torsional force, the battery cells can transmit acting force to more adjacent layers of battery cells; when the whole battery pack is stressed, the force can be more uniformly dissipated and decomposed, the stress concentration is reduced, the torsion resistance of the battery pack is improved, and the structural strength of the battery pack is improved; and the separation parts can separate the adjacent layers of battery cells, and can assist in improving the structural strength of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack. The present invention also relates to an electrical device equipped with the battery pack. Background Art

[0002] As energy storage units, battery packs play a crucial role in modern energy storage devices. To meet the endurance and functional requirements of these devices, battery packs typically incorporate multiple cells, neatly arranged and grouped within the pack. This design maximizes space utilization, thereby increasing the pack's overall capacity and power reserve.

[0003] Battery packs are currently growing in size to maximize their capacity, which in turn can lead to drawbacks. For example, when a battery pack is used in a vehicle, the unevenness of the road surface can affect the multiple tires, which can easily transfer torsional forces to the battery pack. However, the battery pack's torsional resistance is limited, and when subjected to significant torsional forces, it can easily twist and deform. This long-term fatigue can lead to structural failure, posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery pack to improve the anti-torsion capability of the battery pack.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A battery pack, comprising:

[0007] At least two layers of battery cells and a separator connected between two adjacent layers of the battery cells;

[0008] The battery cells are square battery cells with side-exiting poles. The battery cells in the same layer are arranged parallel to each other, and there is an angle between the projections of the length directions of the battery cells in two adjacent layers on the partition.

[0009] Furthermore, the length of the battery cell is L, 300mm≤L≤650mm.

[0010] Furthermore, the length of the battery cell is L, 500mm≤L≤600mm.

[0011] Furthermore, taking the length direction or width direction of the battery pack as the first direction, the deflection directions of the battery cells in two adjacent layers relative to the first direction are opposite, the angle between the length direction of the battery cell and the first direction is θ, the thickness of the battery cell is T, 27°*T / L<θ<72°*T / L.

[0012] Furthermore, the gap between adjacent battery cells in the same layer is A, 0.4 mm ≤ A ≤ 1.5 mm.

[0013] Furthermore, the battery pack includes a tray, an end plate and a filling body;

[0014] The tray is capable of supporting the battery cell, and two end plates are provided in parallel and fixedly connected to the tray;

[0015] Each layer of battery cells is provided with a filling body at both ends in the arrangement direction, and the two filling bodies clamp the battery cells in the same layer; the filling body has a first surface in contact with the large surface of the battery cell and a second surface in contact with the end plate, and can together with the end plate constitute a limit for the battery cell in the arrangement direction of the battery cell.

[0016] Furthermore, the filling body is a shell with an opening on one side facing the end plate, and reinforcing ribs are provided in the filling body.

[0017] Furthermore, the partition includes a structural plate, and the structural plate is bonded to the adjacent battery cells.

[0018] Furthermore, the structural plate is a liquid cooling plate.

[0019] Furthermore, the structural plate is bonded to the top of the battery cell on the top layer.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The battery pack described in the present invention changes the conventional arrangement so that the projections of two adjacent layers of battery cells on the partition have an angle, which allows the battery cells to be opposite to at least two adjacent layers of battery cells. When the battery pack is subjected to a torsional force, the battery cells can transmit the force to more adjacent layers of battery cells, so that when the battery pack as a whole is subjected to force, the force can be dissipated and decomposed more evenly, reducing stress concentration, improving the battery pack's anti-torsion ability, and increasing the structural strength of the battery pack; the partition can separate the battery cells of adjacent layers, and can also help improve the structural strength of the battery pack.

[0022] Secondly, the cell length L is set to 300mm≤L≤650mm, and the square cells within this range can use the above arrangement method. The cell length L is set to 500mm≤L≤600mm, and the cells within this range use the above arrangement method to better enhance the torsional resistance of the battery pack. The cells of two adjacent layers are deflected in opposite directions, which can make the overall appearance of the two adjacent layers of cells after stacking more neat, and also have a better structural reinforcement effect; 27°*T / L<θ<72°*T / L can make the adjacent layers of cells transmit force to each other and enhance the torsional resistance of the battery pack, and also ensure that the arrangement of the cells will not excessively affect the layout space of other structures in the battery pack.

[0023] Furthermore, the spacing between adjacent cells in the same layer is set to 0.4mm≤A≤1.5mm, which can not only ensure the thermal insulation and heat dissipation capacity between the cells, but also prevent the cells from occupying too much space in the battery pack and causing the energy density to be too low. The tray can support all the cells, and the end plates and fillers can work together to limit the arrangement of the cells, making the overall shape of the cells, fillers and end plates more regular, which is convenient for the assembly and integration of the battery pack. Setting the filler as a shell with an opening on one side and then providing reinforcing ribs inside the shell can reduce the weight of the filler, which is conducive to reducing the weight of the entire pack.

[0024] Furthermore, bonding the structural plate to the battery cells provides a more secure connection between adjacent layers of cells, improving force transmission and enhancing the overall structural strength of the battery pack. Using the structural plate as a liquid cooling plate effectively cools the battery cells. Bonding the structural plate to the top layer of cells prevents them from shifting, enhancing the overall structural strength of the battery pack.

[0025] Another object of the present invention is to provide an electrical device equipped with the battery pack described above.

[0026] The electrical device of the present invention can enhance its overall structural strength and have a better ability to resist external impacts by providing the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic structural diagram of the battery pack according to the first embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the positional relationship between the battery core and the filling body according to the first embodiment of the present invention;

[0030] Figure 3 This is a top view of the battery cell and the filling body after being connected according to the first embodiment of the present invention;

[0031] Figure 4 This is a schematic structural diagram of the battery cell described in Example 1 of the present utility model.

[0032] Description of reference numerals:

[0033] 1. Battery cells;

[0034] 101. Big noodles;

[0035] 2. Separator;

[0036] 201, structural plate; 202, water inlet module; 203, water return module;

[0037] 3. Pallet;

[0038] 4. End plate;

[0039] 5. Filling body;

[0040] 501, first side; 502, second side; 503, reinforcement rib. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0042] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0043] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0045] Example 1

[0046] This embodiment relates to a battery pack to improve the anti-torsion capability of the battery pack.

[0047] Structurally, a battery pack in this embodiment includes at least two layers of cells and a separator connecting adjacent layers. The cells are square with side-exiting terminals. Cells in the same layer are arranged parallel to each other, with the length projections of adjacent layers of cells onto the separator forming an angle.

[0048] As described above, by changing the arrangement of the battery cells so that the projections of two adjacent layers of battery cells on the separator form an angle, the battery cells can be aligned with at least two adjacent layers of battery cells. When the battery pack is subjected to a torsional force, the battery cells can transfer the force to more adjacent layers of battery cells, allowing the battery pack as a whole to dissipate the force more evenly, reducing stress concentration, improving the battery pack's torsional resistance, and increasing its structural strength. The separator can separate adjacent layers of battery cells and also help improve the battery pack's structural strength.

[0049] Based on the above overall introduction, refer to Figure 1 、 Figure 2 and Figure 3 As shown, specifically, the specific stacking number of battery cells 1 can be selected according to actual needs. In this embodiment, a battery pack with two layers of battery cells 1 is taken as an example. The battery cell 1 is a blade-shaped square battery cell 1 with a pole protruding from the side along the length direction.

[0050] Among them, the battery pack includes a tray 3, an end plate 4 and a filling body 5. The tray 3 can support the battery cell 1 and can serve as the bottom protective plate of the battery pack to support the internal parts of the battery pack. Two end plates 4 are provided in parallel to fix the tray 3. The specific connection method can be bonding, bolt connection or welding. In this embodiment, the preferred connection method is bonding, which is more convenient and has better connection strength. Each layer of battery cells 1 is provided with a filling body 5 at both ends of the arrangement direction. The two filling bodies 5 clamp the battery cells 1 of the same layer, that is, the filling body 5-each battery cell 1-filling body 5 are arranged in sequence. The filling body 5 has a first surface 501 in contact with the large surface 101 of the battery cell 1, and a second surface 502 in contact with the end plate 4. It can form a limit for the battery cell 1 in the arrangement direction of the battery cell 1 together with the end plate 4. Each end plate 4 contacts two filling bodies 5, which can make the whole composed of the battery cell 1, the filling body 5 and the end plate 4 have a more regular appearance.

[0051] Specifically, the vertical projection of the filling body 5 of this embodiment is a right trapezoid, the surface corresponding to the right waist of the right trapezoid is the second surface 502, and the surface corresponding to the oblique waist of the right trapezoid is the first surface 501, which can stably support and limit the same-layer battery cells 1. In some embodiments, the vertical projection of the filling body 5 can also be a right triangle, that is, the surface corresponding to the right angle of the right triangle is the second surface 502, and the surface corresponding to the hypotenuse of the right triangle is the first surface 501. Of course, as long as the filling body 5 meets the conditions of having the first surface 501 and the second surface 502, it can achieve its function of supporting and limiting the battery cells 1, and the specific shape of the filling body 5 is not limited.

[0052] Secondly, in order to reduce the weight of the filling body 5, the filling body 5 of this embodiment is a shell with an opening on one side facing the end plate 4. Reinforcing ribs 503 are provided in the filling body 5. There are multiple reinforcing ribs 503 perpendicular to the first surface 501, and the reinforcing ribs 503 are arranged parallel to each other.

[0053] It is understandable that the provision of the tray 3 can support all the battery cells 1, allowing the battery cells 1 to be stably assembled. The end plate 4 and the filler 5 work together to limit the arrangement of the battery cells 1, making the overall shape of the battery cells 1, the filler 5 and the end plate 4 more regular, forming a box-like structure that is approximately rectangular, which facilitates the assembly and integration of the battery pack. Secondly, the filler 5 is set as a shell with an opening on one side, and then reinforcing ribs 503 are set in the shell, which can reduce the weight of the filler 5 and help reduce the weight of the entire package.

[0054] Regarding the specific structure of the separator 2, the separator 2 of this embodiment includes a structural plate 201, and the structural plate 201 is bonded to the adjacent battery cells 1. The structural plate 201 is bonded to the battery cells 1, which can more firmly connect the two adjacent layers of battery cells 1, and has better force transmission performance, while also enhancing the overall structural strength of the battery pack. The specific adhesive can be structural adhesive, which is beneficial to enhancing the overall strength between the battery cells 1 and the structural plate 201. In some other embodiments, the separator 2 can be set to a colloid to directly bond the upper and lower layers of battery cells 1.

[0055] To further enhance the battery pack's structural strength, a structural plate 201 is bonded to the top of the top layer of cells 1. Bonding this plate to the top layer of cells 1 prevents them from shifting, enhancing the overall structural strength of the battery pack and improving its modal properties. The sandwiching of the two layers of cells 1 by the top plate 201, the plate 201 between the upper and lower layers, and the tray 3 provides superior overall structural strength and maintains stability even under external forces.

[0056] Furthermore, the structural plate 201 is a liquid cooling plate. Setting the structural plate 201 as a liquid cooling plate can cool the battery cells 1, achieving a good cooling effect. The liquid cooling plate between the upper and lower layers of battery cells 1 can cool both layers of battery cells 1, and the liquid cooling plate bonded to the top layer of battery cells 1 can cool the upper layer of battery cells 1. Formulating a specific battery management strategy based on this structure can enable efficient heat dissipation of the battery pack. Specifically, a water inlet module 202 and a water return module 203 are provided between the upper and lower liquid cooling plates. The main body of the water inlet module 202 is a three-way structure, with the water inlet connected to the external coolant circulation line and the two water outlets connected to the water inlets of the two liquid cooling plates respectively. The main body of the water outlet module is also a three-way structure, with the water outlet connected to the external coolant circulation line and the two water inlets connected to the water outlets of the two liquid cooling plates respectively. The water inlet module 202 and the water return module 203 jointly realize the circulating water supply to the two liquid cooling plates. Of course, the structural plate 201 can also be configured as an insulating plate or a reinforcing plate to obtain other required functions.

[0057] Similarly, tray 3 can be configured as a liquid cooling plate and connected to an external coolant circulation circuit to cool the bottom battery cells 1. The bottom battery cells 1 and tray 3 are bonded using thermally conductive adhesive, which further improves the heat dissipation efficiency of the battery pack and enhances thermal management capabilities.

[0058] In addition, for the specific size of the battery cell 1, refer to Figure 3 and Figure 4 As shown, the length of the battery cell 1 in this embodiment is L, 300mm≤L≤650mm. The length L of the battery cell 1 is set to 300mm≤L≤650mm. The square battery cells 1 within this range can all use the above arrangement method, which can achieve the predetermined structural reinforcement effect. L<300mm, the projections of the battery cells 1 in adjacent layers on the partition 2 overlap less, and the anti-torsion effect is also relatively small. L is greater than 650mm, and the battery cell 1 is too long, which will affect the stability of the battery cell 1 itself and its bending resistance is weak. Preferably, the length of the battery cell 1 is L, 500mm≤L≤600mm. The battery cells 1 within this range are longer in length and can have more vertical overlapping areas with the battery cells 1 in adjacent layers, thereby enhancing the force dispersion effect. It does not affect the overall outer dimensions of the battery pack, and the outer dimensions of the battery pack will not be forced to increase due to the excessive length of the battery cell 1.

[0059] Furthermore, with the length or width of the battery pack as a first direction, the deflection directions of two adjacent layers of battery cells 1 relative to the first direction are opposite. The angle between the length of the battery cell 1 and the first direction is θ, and the thickness of the battery cell 1 is T. The deflection direction of the battery cell 1 is specifically defined as the deflection direction of the battery cell 1 relative to the normal line, with the front end of the battery cell 1 in the first direction as the endpoint. The deflection direction of the battery cell 1 relative to the normal line is defined as the deflection direction of the battery cell 1. The deflection directions of the two adjacent layers of battery cells 1 are one clockwise and the other counterclockwise. Deflecting the battery cells 1 in opposite directions in two adjacent layers of battery cells 1 improves the overall appearance of the stacked layers and provides better structural reinforcement. The condition of 27°*T / L<θ<72°*T / L allows the adjacent layers of battery cells 1 to transmit force to each other, enhancing the battery pack's torsional resistance, while also ensuring that the arrangement of the battery cells 1 does not excessively impact the layout space of other structures within the battery pack. Of course, the battery cells 1 in adjacent layers may also be deflected in the same direction or any layer of battery cells 1 may not be deflected (θ is 0). The appearance of these arrangements is relatively irregular, which is not conducive to the assembly of the battery pack and also has a poor effect on the structural reinforcement of the battery pack.

[0060] Regarding the arrangement of cells 1 on the same layer, in this embodiment, the gap A between adjacent cells 1 on the same layer is 0.4mm≤A≤1.5mm. Specifically, thermal insulation adhesive or separator strips can be used for separation. In this embodiment, thermal insulation adhesive is used to separate adjacent cells 1 on the same layer. Setting the spacing between adjacent cells 1 on the same layer to 0.4mm≤A≤1.5mm ensures thermal insulation and heat dissipation between cells 1 without causing the cells 1 to occupy too much space within the battery pack, resulting in low energy density.

[0061] The battery pack of this embodiment has two layers of battery cells 1 arranged at an angle on the partition 2. When the battery pack is subjected to torsional force, the battery cells 1 can transmit the force to more adjacent layers of battery cells 1, so that when the battery pack as a whole is subjected to force, the force can be dissipated and decomposed more evenly, reducing stress concentration, improving the battery pack's anti-torsion ability, and increasing the structural strength of the battery pack.

[0062] Example 2

[0063] This embodiment relates to an electrical device equipped with the battery pack of the first embodiment. By providing the aforementioned battery pack, the electrical device of this embodiment can enhance its overall structural strength and provide better resistance to external impacts. For example, when the electrical device is a vehicle, the battery pack has strong torsional resistance, which can more effectively support the vehicle body and improve the vehicle's handling and stability. In extreme situations such as vehicle collisions, the battery pack may be subjected to a large impact force. The battery pack's strong torsional resistance can prevent the battery pack from being severely deformed or damaged, making the vehicle safer to use.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: At least two layers of battery cells and a separator connected between two adjacent layers of the battery cells; The battery cells are square battery cells with side-exiting poles. The battery cells in the same layer are arranged parallel to each other, and there is an angle between the projections of the length directions of the battery cells in two adjacent layers on the partition.

2. The battery pack according to claim 1, wherein: The length of the battery core is L, 300mm≤L≤650mm.

3. The battery pack according to claim 2, wherein: The length of the battery core is L, 500mm≤L≤600mm.

4. The battery pack according to claim 2, wherein: Taking the length direction or width direction of the battery pack as the first direction, the deflection directions of the battery cells in two adjacent layers relative to the first direction are opposite, the angle between the length direction of the battery cell and the first direction is θ, the thickness of the battery cell is T, 27°*T / L<θ<72°*T / L.

5. The battery pack according to claim 1, wherein: The gap between adjacent battery cells in the same layer is A, 0.4mm≤A≤1.5mm.

6. The battery pack according to claim 1, wherein: Including tray, end plate and filling body; The tray is capable of supporting the battery cell, and two end plates are provided in parallel and fixedly connected to the tray; Each layer of battery cells is provided with a filling body at both ends in the arrangement direction, and the two filling bodies clamp the battery cells in the same layer; the filling body has a first surface in contact with the large surface of the battery cell and a second surface in contact with the end plate, and can together with the end plate constitute a limit for the battery cell in the arrangement direction of the battery cell.

7. The battery pack according to claim 6, wherein: The filling body is a shell with an opening on one side facing the end plate, and reinforcing ribs are provided in the filling body.

8. The battery pack according to any one of claims 1 to 7, wherein: The separator includes a structural plate, and the structural plate is bonded to the adjacent battery cells.

9. The battery pack according to claim 8, wherein: The structural plate is a liquid cooling plate; and / or, The top of the battery cell on the top layer is bonded with the structural plate.

10. An electrical device, characterized in that: The electric device is equipped with the battery pack according to any one of claims 1 to 9.

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