Battery pack and electric device

Abstract

The invention provides a battery pack. The battery pack comprises a box body, a plurality of battery monomers in the box body, a heat management component and a supporting piece, the box body comprises a bottom plate; supporting pieces are arranged between the battery monomers and the bottom plate, and heat management components are arranged between the adjacent battery monomers; in the first direction, the supporting piece comprises a first supporting part and a second supporting part, the first supporting part is arranged between the bottom plate and the second supporting part, and the second supporting part is arranged between the first supporting part and the battery monomer; the first supporting part comprises a first groove, and the heat management component is partially arranged in the first groove in the first direction.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment, and specifically provides a battery pack and an electrical device. Background Art

[0002] New energy vehicles have developed rapidly in recent years due to their environmental protection and low energy consumption. Many car companies have joined the research and development of new energy vehicles. As the most important component of new energy vehicles, the quality of battery packs seriously affects the development of new energy vehicles.

[0003] For battery packs, safety has always been the most important issue in the field, which seriously affects the development of new energy vehicles. Many companies have also invested a lot of money and manpower in the research and development of these two aspects, but they have not yet been effectively resolved.

[0004] In the actual application environment of battery packs, they are often hit. There are often fire accidents caused by new energy vehicles due to impact, which may affect the life safety of personnel in serious cases. Therefore, improving the battery pack requires a certain impact resistance, and protecting the safety of the battery cells in the pack is an urgent problem to be solved in the current field. Summary of the invention

[0005] In order to solve the safety problems in the prior art, the present invention provides a battery pack, including a box body, a plurality of battery cells and a thermal management component and a support member in the box body, the box body including a bottom plate; a support member is arranged between the battery cells and the bottom plate, and the thermal management component is arranged between adjacent battery cells; along a first direction, the support member includes a first supporting portion and a second supporting portion, the first supporting portion is arranged between the bottom plate and the second supporting portion, and the second supporting portion is arranged between the first supporting portion and the battery cells; the first supporting portion includes a first groove, and along the first direction, the thermal management component is partially arranged in the first groove.

[0006] When the bottom of the battery pack receives an impact, since the thermal management component is partially disposed in the first groove and is closer to the bottom plate than the second support portion, the impact force is transmitted from the bottom plate to the first support portion, and then to the thermal management component and then to the side of the battery cell, and part of the impact force is then transmitted from the first support portion to the second support portion and then to the bottom of the battery cell. This reduces the impact force on the bottom of the battery cell, and the side of the battery cell is only subjected to shear force, thereby protecting the safety of the battery cell.

[0007] In an optional technology of the present invention, a buffer is provided between the thermal management component and the first support portion. When the bottom plate receives an impact, the impact is transmitted from the bottom plate to the first support portion, then to the buffer via the first support portion, and then to the thermal management component. The buffer can absorb energy, thereby reducing the impact force transmitted to the thermal management component.

[0008] In an optional technology of the present invention, an adhesive is provided between the buffer and the thermal management component, and an adhesive is provided between the buffer and the first support portion. The buffer and the thermal management component, and the buffer and the first support portion are bonded together by the adhesive, so that the first support portion, the buffer and the thermal management component are compactly connected, which ensures the stability of the overall structure and facilitates the transmission of the impact force.

[0009] In an optional technology of the present invention, the buffer component includes at least one of foam or potting glue.

[0010] In the optional technology of the present invention, along the first direction, the above-mentioned thermal management component includes a first thermal management component part and a second thermal management component part, the above-mentioned first thermal management component part is provided with a channel, the above-mentioned second thermal management component part is a solid structure, and the above-mentioned second thermal management component part is at least partially located in the above-mentioned first groove. The channel of the first thermal management component part allows the medium to pass through so as to perform heat exchange with the battery cells adjacent thereto, thereby ensuring the thermal management capability of the battery pack. In addition, the second thermal management component part is designed to be a solid structure, which has high strength and impact resistance, so that the second thermal management component part can withstand the impact force transmitted by the first support part.

[0011] In the optional technology of the present invention, the length L of the second thermal management component part satisfies: 20mm≤L≤35mm. If the length L of the second thermal management component part is too short, it may be damaged because it cannot withstand a large impact force; if L is too long, the heat exchange area between the thermal management component and the battery cell is too small and the internal channel volume is limited, affecting the thermal management capability. Setting L in the above numerical range can take into account both thermal management capability and impact resistance.

[0012] In an optional technology of the present invention, the first support portion includes a top wall and two side walls that enclose the first groove, the top wall is in contact with the bottom plate, and the side walls are provided with a weak portion. When the bottom plate receives an impact force, the bottom plate transmits the impact force to the top wall of the first support portion, and then transmits the impact force to the side wall. A weak portion is provided on the side wall of the first support portion, and when an excessive impact force is received, the weak portion can rupture and collapse to absorb energy, so as to prevent the excessive impact force from damaging the battery cell.

[0013] In an optional technology of the present invention, the above-mentioned weak part is a hole or a notch. When the bottom plate receives an excessive impact force, it can collapse from the hole or the notch.

[0014] In an optional technology of the present invention, the above-mentioned weak part is a notch, and the thickness H of the above-mentioned weak part satisfies: 0.5mm≤H≤1mm. H is designed to be greater than or equal to 0.5mm, so as to avoid the weak part from collapsing when the impact force is too small. H is designed to be less than or equal to 1mm, so as to avoid the difficulty of collapsing when receiving too large an impact force.

[0015] In an optional technology of the present invention, the above-mentioned weak portion is a notch, and the angle α of the above-mentioned notch satisfies: 90°≤α≤120°.

[0016] In an optional technology of the present invention, along the second direction in which the side wall extends, the length of the weak portion is the same as the length of the side wall, so as to ensure that the side wall can collapse completely along the extending direction of the side wall when subjected to excessive impact force.

[0017] In an optional technology of the present invention, along the first direction, the weak portion is closer to the bottom plate than the thermal management component, or the weak portion is flush with the bottom of the thermal management component, so as to ensure that when receiving an excessive impact force, the weak portion will collapse first and then be transmitted to the thermal management component.

[0018] In an optional technology of the present invention, the battery cell is a cylindrical battery cell, and a placement position with a through hole is provided on the second supporting portion.

[0019] The present invention also provides an electrical device, comprising the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure inside the battery pack;

[0021] Figure 2 yes Figure 1 Middle partial enlarged picture;

[0022] Figure 3 yes Figure 2 The main view;

[0023] Figure 4 yes Figure 3 A partial enlarged view of

[0024] Figure 5 is a schematic diagram of the support;

[0025] Figure 6 is an assembly drawing of the support and thermal management components;

[0026] Figure 7 This is a schematic diagram after glue filling.

[0027] List of reference numerals:

[0028] Battery cell 1;

[0029] Thermal management component 2;

[0030] A first thermal management unit 2.1, a second thermal management unit 2.2, and a channel 2.11;

[0031] Support member 3;

[0032] A first supporting portion 3.1, a second supporting portion 3.2, a groove 3.11, a top wall 3.12, a side wall 3.13, and a through hole 3.21;

[0033] Bottom plate 4;

[0034] Buffer 5;

[0035] Adhesive 6;

[0036] Weakness 7;

[0037] Potting glue 8;

[0038] Exhaust channel 9. DETAILED DESCRIPTION

[0039] The following describes the optional embodiments of the present invention with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0040] In the description of the present invention, it is necessary to understand that the terms "distance", "width", "thickness", "up", "down", "left", "right", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0041] In the description of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In order to solve the security problems in the existing technology, such as Figure 1 and Figure 2As shown, the present invention provides a battery pack, including a box body, a plurality of battery cells 1 and a thermal management component 2 and a support member 3 in the box body, the box body includes a bottom plate 4; a support member 3 is arranged between the battery cell 1 and the bottom plate 4, and the thermal management component 2 is arranged between adjacent battery cells 1; along a first direction, the support member 3 includes a first support portion 3.1 and a second support portion 3.2, the first support portion 3.1 is arranged between the bottom plate 4 and the second support portion 3.2, and the second support portion 3.2 is arranged between the first support portion 3.1 and the battery cell 1; the first support portion 3.1 includes a first groove 3.11, and along the first direction, the thermal management component 2 is partially arranged in the first groove 3.11.

[0044] When the bottom of the battery pack receives an impact, since the thermal management component 2 is partially disposed in the first groove 3.11 and is closer to the bottom plate 4 than the second support portion 3.2, the impact force is transmitted from the bottom plate 4 to the first support portion 3.1, and then to the thermal management component 2 and then to the side of the battery cell 1, and part of the impact force is then transmitted from the first support portion 3.1 to the second support portion 3.2 and then to the bottom of the battery cell 1. In this way, the impact force on the bottom of the battery cell 1 is reduced, and the side of the battery cell 1 is only subjected to shear force, thereby protecting the safety of the battery cell 1.

[0045] In an optional embodiment of the present invention, Figure 2 and Figure 3 As shown, a buffer 5 is provided between the heat management component 2 and the first support portion 3.1. When the bottom plate 4 receives an impact, the impact is transmitted from the bottom plate 4 to the first support portion 3.1, and then to the heat management component 2 through the buffer 5. The buffer 5 can absorb energy and reduce the impact force transmitted to the heat management component 2.

[0046] In an optional embodiment of the present invention, Figure 2 and Figure 3 As shown, an adhesive 6 is provided between the buffer 5 and the thermal management component 2, and an adhesive 6 is provided between the buffer 5 and the first support portion 3.1. The buffer 5 and the thermal management component 2, and the buffer 5 and the first support portion 3.1 are bonded together by the adhesive 6, so that the first support portion 3.1, the buffer 5 and the thermal management component 2 are compactly connected, ensuring the stability of the overall structure and facilitating the transmission of the impact force.

[0047] In an optional embodiment of the present invention, the buffer 5 includes at least one of foam or potting glue. For example, foam can be filled between the first support portion 3.1 and the thermal management component 2, or potting glue can be filled, or a mixture of foam and potting glue or other elastically deformable materials can be filled.

[0048] In an optional embodiment of the present invention, Figure 2As shown, along the first direction, the heat management component 2 includes a first heat management component part 2.1 and a second heat management component part 2.2, the first heat management component part 2.1 is provided with a channel 2.11, the second heat management component part 2.2 is a solid structure, and the second heat management component part 2.2 is at least partially located in the first groove 3.11. The channel 2.11 of the first heat management component part 2.1 allows the medium to pass through so as to perform heat exchange with the battery cell 1 adjacent thereto, thereby ensuring the thermal management capability of the battery pack. In addition, the second heat management component part 2.2 is designed to be a solid structure, which has high strength and impact resistance, so that the second heat management component part 2.2 can withstand the impact force transmitted by the first support part 2.1. In this embodiment, the second heat management component part 2.2 is a solid structure, and of course it can also be a hollow structure, because compared with the case where the heat management component 2 does not extend into the first support part 2.1, it can already play a role in transmitting the bottom impact force to the side of the battery cell, reducing the harm of damage to the battery cell.

[0049] In an optional embodiment of the present invention, Figure 1 As shown, the length L of the second thermal management component 2.2 satisfies: 20mm≤L≤35mm. If the length L of the second thermal management component 2.2 is too short, it may be damaged because it cannot withstand a large impact force; if L is too long, the heat exchange area between the thermal management component 2 and the battery cell 1 is too small and the volume of the internal channel 2.11 is limited, affecting the thermal management capability. Setting L within the above numerical range can take into account both thermal management capability and impact resistance. For example, L can be selected as 20mm, 24mm, 27mm, 29mm or 35mm. Figure 2 and Figure 3 As shown, corresponding to the position of the bare cell inside the battery cell 1, there is a channel 2.11 in the thermal management component 2, that is, the length of the first thermal management component part 2.1 is greater than or equal to the length of the bare cell. Of course, the length of the first thermal management component part 2.1 can also be set to be appropriately smaller than the length of the bare cell.

[0050] In an optional embodiment of the present invention, Figure 2 and Figure 3 As shown, the first support portion 3.1 includes a top wall 3.12 and two side walls 3.13 that enclose a first groove 3.11. The top wall 3.12 is in contact with the bottom plate 4, and a weak portion 7 is provided on the side wall 3.13. When the bottom plate 4 receives an impact force, the impact force is transferred from the bottom plate 4 to the top wall 3.12 of the first support portion 3.1, and then from the top wall 3.12 to the side wall 3.13. A weak portion 7 is provided on the side wall 3.13 of the first support portion 3.1. When an excessive impact force is received, the weak portion 7 can rupture and collapse to absorb energy, so as to prevent the excessive impact force from damaging the battery cell 1. Specifically, the weak portion may be a hole or a notch. When the bottom plate receives an excessive impact force, it can collapse from the hole or the notch. As shown Figure 2 and Figure 3As shown, the weak portion 7 is a notch on the side wall 3.13.

[0051] In an optional embodiment of the present invention, Figure 4 As shown, the thickness H of the weak part satisfies: 0.5mm≤H≤1mm. H is designed to be greater than or equal to 0.5mm to avoid the weak part from collapsing when the impact force is too small. H is designed to be less than or equal to 1mm to avoid difficulty in collapsing when receiving too large an impact force. The angle α of the notch satisfies: 90°≤α≤120°. For example, H can be selected as 0.5mm, 0.7mm, 0.9mm or 1mm, and α can be selected as 90°, 100°, 110° or 120°.

[0052] In an optional embodiment of the present invention, Figure 5 As shown, along the second direction in which the side wall 3.13 extends, the length of the weak portion 7 is the same as the length of the side wall 3.13, ensuring that when subjected to excessive impact force, the side wall can collapse completely along the extending direction of the side wall.

[0053] In an optional embodiment of the present invention, Figure 1 , Figure 2 and Figure 3 As shown, along the first direction, the weak portion 7 is closer to the bottom plate 4 than the thermal management component 2. Of course, the weak portion 7 can also be flush with the bottom of the thermal management component 2. It is ensured that when receiving excessive impact force, the weak portion 7 will collapse first and then be transmitted to the thermal management component.

[0054] In an optional embodiment of the present invention, Figure 5 and Figure 6 As shown, the support member 3 is a "X"-shaped structure, and the support member 3 includes a first support portion 3.1 with a first groove 3.11 in the middle, and a plate-shaped second support portion 3.2 on both sides of the first support portion 3.1. The thermal management component 2 is inserted into the first groove in the middle. The plate-shaped second support portion 3.2 is provided with a placement position for the battery cell 1. In this embodiment, the first groove 3.11 is a trapezoidal structure, that is, the first support portion 3.1 is an open trapezoidal structure, and the side wall 3.13 is inclined relative to the bottom plate 4. Of course, the first support portion 3.1 can also be set as an open rectangular structure, or other feasible structures.

[0055] Specifically, in the present embodiment, the battery cell 1 is a cylindrical battery cell, so the corresponding placement position on the second support portion 3.2 can be a second groove with a through hole 3.21. The cylindrical battery cell can be bonded to the second groove, and the through hole 3.21 can allow the cylindrical battery cell to release pressure and exhaust. In the present embodiment, an explosion-proof valve is provided on the bottom cover of the cylindrical battery cell. When thermal runaway occurs, the thermal runaway gas breaks through the explosion-proof valve and enters the exhaust channel 9 between the two adjacent first support portions 3.1 through the through hole 8, and finally is discharged out of the package through the exhaust valve on the box body. The thermal management component 2 includes an arc-shaped surface that matches the side of the cylindrical battery cell to increase the heat exchange area with the cylindrical battery cell and enhance the heat exchange efficiency. In addition, in order to stabilize the overall structure, such as Figure 7 As mentioned above, potting glue 8 can be provided between adjacent cylindrical battery cells and between cylindrical battery cells and thermal management components. It is understandable that other types of battery cells, such as square shells, blades or soft packs, can also be placed on the second support portion 3.2. As for the exhaust structure and the structure of the thermal management component, they can also be adjusted according to actual needs.

[0056] The present invention also provides an electric device, which includes the above-mentioned battery pack, and the electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0057] So far, the technical solutions of the present invention have been described in conjunction with the optional implementation modes shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific implementation modes. Without departing from the principle of the present invention, 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 invention.

Claims

1. A battery pack, comprising The box body, including the bottom plate; A plurality of battery cells, wherein a support member is disposed between the battery cells and the bottom plate, and a heat management member is disposed between adjacent battery cells; Along the first direction, the support member includes a first support portion and a second support portion, the first support portion is arranged between the bottom plate and the second support portion, and the second support portion is arranged between the first support portion and the battery cell; The first supporting portion comprises a first groove, and the heat management component is partially disposed in the first groove along a first direction.

2. The battery pack according to claim 1, characterized in that: A buffer is disposed between the heat management component and the first support portion.

3. The battery pack according to claim 1, wherein: An adhesive is disposed between the buffer and the heat management component, and an adhesive is disposed between the buffer and the first support portion.

4. The battery pack according to claim 2, characterized in that: The buffer component includes at least one of foam or potting glue.

5. The battery pack according to claim 2, characterized in that: Along the first direction, the heat management component includes a first heat management component part and a second heat management component part, wherein the first heat management component part is provided with a channel, the second heat management component part is a solid structure, and the second heat management component part is at least partially located in the first groove.

6. The battery pack according to claim 5, characterized in that: The length L of the second heat management component satisfies: 20 mm ≤ L ≤ 35 mm.

7. The battery pack according to claim 1, characterized in that: The first supporting portion includes a top wall and two side walls surrounding the first groove, the top wall is in contact with the bottom plate, and the side walls are provided with weak parts.

8. The battery pack according to claim 7, characterized in that: The weak portion is a hole or a notch.

9. The battery pack according to claim 8, characterized in that: The weak portion is a notch, and a thickness H of the weak portion satisfies: 0.5 mm ≤ H ≤ 1 mm.

10. The battery pack according to claim 8, characterized in that: The weak portion is a notch, and an angle α of the notch satisfies: 90°≤α≤120°.

11. The battery pack according to claim 7, characterized in that: Along a second direction in which the side wall extends, a length of the weak portion is the same as a length of the side wall.

12. The battery pack according to claim 1, wherein: Along the first direction, the weak portion is closer to the bottom plate than the heat management component, or the weak portion is flush with the bottom of the heat management component.

13. The battery pack according to claim 1, wherein: The battery cell is a cylindrical battery cell, and a placement position with a through hole is provided on the second supporting portion.

14. An electrical device comprising the battery pack according to any one of claims 1 to 13.

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