Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack, which comprises a box body provided with a containing cavity, and the containing cavity comprises a bottom wall and two first side walls which are oppositely arranged along a first direction; the plurality of battery packs are arranged between the two first side walls, and each battery pack comprises a plurality of single batteries arranged along a second direction; the first partition plate is arranged between two adjacent battery packs; the second partition plate is arranged between the first side wall and the battery pack on the outermost side in the first direction, and the yield strength of the first partition plate is larger than that of the second partition plate. The first partition plate provides physical isolation between the battery packs, and the second partition plate provides physical isolation between the box body and the battery pack on the outermost side, so that the structural strength, the overall rigidity and the impact resistance of the battery pack are enhanced, the battery pack can better resist external pressure and impact, and internal components are protected from being damaged; damage of the box body and the single batteries caused by external impact, vibration or other mechanical damage is reduced, and risks of short circuit and thermal runaway of the battery pack are reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] With the development of the new energy industry, batteries have been applied in different fields and in various environments, such as portable electronic devices (such as laptops and mobile phones), electric vehicles, and energy storage systems.

[0003] Currently, battery packs mainly consist of a housing and multiple battery packs. The multiple battery packs are housed inside the housing. When performing side impact simulation analysis on the battery pack, the overall structural strength of the battery pack does not meet the requirements. When the side of the battery pack is impacted, it may not only damage the housing of the battery pack, but also cause direct damage to the individual cells inside, which may lead to more serious safety problems such as short circuits and thermal runaway. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem of low structural strength on the sides of the battery pack.

[0005] This utility model provides a battery pack, comprising: a housing having a receiving cavity, the receiving cavity including a bottom wall and two first side walls disposed opposite each other along a first direction; a plurality of battery packs arranged between the two first side walls along the first direction, each battery pack including a plurality of individual cells arranged along a second direction perpendicular to the first direction; a first separator extending along the second direction and disposed between two adjacent battery packs; and a second separator extending along the second direction and disposed between the first side walls and the outermost battery pack along the first direction, wherein the yield strength of the first separator is greater than the yield strength of the second separator.

[0006] Beneficial effects: The first separator can provide physical isolation between battery packs, and the second separator can provide physical isolation between the casing and the outermost battery pack in the first direction, enhancing the structural strength of the battery pack, thereby enhancing the overall rigidity and impact resistance of the battery pack, making it more resistant to external pressure and impact, protecting internal components from damage, reducing damage to the casing and individual cells caused by external impact, vibration or other mechanical damage, thereby reducing the risk of short circuit and thermal runaway of the battery pack. Attached Figure Description

[0007] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 This is a perspective view of a battery pack according to an embodiment of the present utility model;

[0009] Figure 2 for Figure 1 The 3D view of the battery pack shown has the battery pack removed.

[0010] Figure 3 for Figure 1 A top view of the battery pack shown;

[0011] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0012] Figure 5 for Figure 3 Side view of the two battery packs and the first separator shown;

[0013] Figure 6 for Figure 5 A magnified view of part B in the diagram.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Box body; 101. Bottom wall; 102. First side wall;

[0016] 2. Battery pack; 201. Individual cell;

[0017] 3. First partition;

[0018] 4. Second partition;

[0019] 5. Second reinforcing beam;

[0020] 6. First reinforcing beam;

[0021] 7. Insulation layer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0024] According to an embodiment of the present invention, a battery pack is provided, comprising: a housing 1, multiple battery packs 2, a first partition 3, and a second partition 4. The housing 1 has a receiving cavity, which includes a bottom wall 101 and two first side walls 102 arranged opposite each other along a first direction. The multiple battery packs 2 are arranged between the two first side walls 102 along the first direction, and each battery pack 2 includes multiple individual cells 201 arranged along a second direction, which is perpendicular to the first direction. The first partition 3 extends along the second direction and is disposed between two adjacent battery packs 2. The second partition 4 extends along the second direction and is disposed between the first side wall 102 and the outermost battery pack 2 along the first direction. The yield strength of the first partition 3 is greater than the yield strength of the second partition 4.

[0025] In the battery pack of this embodiment, the first separator 3 can provide physical isolation between the battery packs 2, and the second separator 4 can provide physical isolation between the housing 1 and the outermost battery pack 2 in the first direction, thereby enhancing the structural strength of the battery pack, and thus enhancing the overall rigidity and impact resistance of the battery pack, making it more resistant to external pressure and impact, protecting the internal components from damage, reducing damage to the housing 1 and individual battery 201 caused by external impact, vibration or other mechanical damage, thereby reducing the risk of short circuit and thermal runaway of the battery pack.

[0026] Furthermore, the yield strength of the first partition 3 is greater than that of the second partition 4, and the first partition 3 can withstand greater stress without plastic deformation, thereby improving the safety and reliability of the entire structure.

[0027] In one embodiment, the yield strength of the first partition 3 is greater than 50 MPa, which enables the first partition 3 to provide stronger support and better resistance to deformation, thereby helping to maintain the overall stability and integrity of the structure.

[0028] In one embodiment, the first separator 3 is made of metal, and the second separator 4 is made of PCM. The metal first separator 3 has high strength and rigidity, effectively resisting external impacts and vibrations, providing robust physical protection for the battery pack 2. Furthermore, metal is an excellent thermal conductor, rapidly transferring heat from one area to another, improving the heat dissipation performance of the battery pack and thus its heat dissipation efficiency. The PCM second separator 4 can absorb a large amount of heat at specific temperatures and undergo a phase change, effectively controlling the battery operating temperature and preventing overheating. When the ambient temperature drops, the PCM can release the stored heat, helping to maintain stable battery temperature.

[0029] It should be noted that PCM stands for phase change material. For example, PCM can be epoxy resin PCM, paraffin-expanded graphite composite material, or multilayer fire-resistant PCM composite material formed by hot pressing fire-resistant silicone layer, glass fiber layer and PCM layer, etc.

[0030] In one embodiment, such as Figure 1 and Figure 2 As shown, a first reinforcing beam 6 extending along a second direction is provided within the accommodating cavity. The first reinforcing beam 6 divides the accommodating cavity into two accommodating sub-cavities, each of which houses multiple battery packs 2. The first reinforcing beam 6 provides physical isolation between the two accommodating sub-cavities, further enhancing the structural strength of the battery pack, thereby improving the overall rigidity and impact resistance of the battery pack, making it more resistant to external impacts and vibrations, and protecting the internal battery cells and other electronic components from damage. In the event of a collision or compression, the first reinforcing beam 6 can effectively disperse external forces, reducing the possibility of local deformation and ensuring the integrity and functionality of the battery pack.

[0031] Furthermore, along the first direction, a cavity is formed between the battery pack 2 closest to the first reinforcing beam 6 and the first reinforcing beam 6. No partition is set in the cavity. Since the first reinforcing beam 6 has high structural strength, there is no need to set a partition between the battery pack 2 closest to the first reinforcing beam 6 and the first reinforcing beam 6, thus saving costs.

[0032] It is understandable that, in another embodiment, the first reinforcing beam 6 may not be provided.

[0033] In one embodiment, such as Figure 3 and Figure 4 As shown, along the first direction, the gap C between the battery pack 2 closest to the first reinforcing beam 6 and the first reinforcing beam 6 is 2mm-7mm.

[0034] Furthermore, the gap C cannot be too large or too small. If the gap C is too large, it will reduce the overall rigidity of the battery pack, making it unable to effectively resist external impacts and vibrations, and increasing the risk of damage to the battery pack 2. An excessively large gap C will waste space and limit the energy density of the battery pack, that is, reduce the energy stored in the same volume. If the gap C is too small, there will not be enough deformation buffer space when the side column is hit, and the battery pack 2 will easily have a mechanical impact with the first reinforcing beam 6, and will easily transmit the impact force of the collision to the adjacent accommodating sub-cavities.

[0035] Therefore, with the gap C within the aforementioned range, the structural strength of the battery pack is guaranteed, the risk of damage to the battery pack 2 is reduced, space is avoided, the energy density of the battery pack is increased, and a certain deformation buffer space is also guaranteed between the battery pack 2 and the first reinforcing beam 6, so as to avoid mechanical impact between the battery pack 2 and the first reinforcing beam 6 and the transmission of impact force to the adjacent accommodating sub-cavities, thereby improving the safety performance of the battery pack.

[0036] Preferably, C is 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or within any two of the above values.

[0037] In one embodiment, the first separator 3 is made of aluminum alloy. Aluminum in aluminum alloy has a relatively low density, and using an aluminum first separator 3 helps to significantly reduce the weight of the entire battery pack. This is especially important for weight-sensitive applications such as electric vehicles, as it can improve vehicle energy efficiency and driving range. Aluminum has good thermal conductivity, which can quickly transfer heat from one area to another. In the battery pack, this helps to dissipate heat more effectively, prevent local overheating, thereby extending battery life and improving system efficiency. Despite its light weight, aluminum still provides sufficient strength and rigidity to support the battery pack 2 and protect it from external shocks and vibrations.

[0038] It is understood that in another embodiment, the first partition 3 may also be made of other metals, and is not limited thereto.

[0039] In one embodiment, such as Figure 5 and Figure 6 As shown, both surfaces of the first separator 3 are provided with an insulating layer 7, and the surface of the second separator 4 near the battery pack 2 is also provided with an insulating layer 7. The first separator 3 is located between the battery packs 2, and the battery pack 2 is disposed on one side of the second separator 4. The first separator 3 and the second separator 4 may come into contact with conductive components at different potentials. By providing insulating layers 7 on both surfaces of the first separator 3 and on the surface of the second separator 4 near the battery pack 2, additional electrical isolation protection can be provided, ensuring insulation performance and effectively avoiding the risk of electrical short circuits caused by direct contact, thus ensuring the safe operation of the system.

[0040] In one embodiment, such as Figure 5 and Figure 6 As shown, the thickness T1 of the first partition 3 is 0.5mm-1mm, and the thickness T2 of the insulating layer 7 is 0.15mm-0.3mm.

[0041] Furthermore, the thickness T1 of the first separator 3 cannot be too large or too small. If the thickness T1 of the first separator 3 is too large, it will significantly increase the overall weight of the battery pack, occupy more internal space, limit the number of battery cells that can be accommodated in the battery pack, thereby reducing the energy density and increasing the cost. If the thickness T1 of the first separator 3 is too small, the mechanical support provided by the first separator 3 will not be sufficient to resist external impacts and vibrations, increasing the risk of damage to the battery pack 2, and may also fail to effectively transfer heat, potentially leading to local overheating problems.

[0042] Therefore, by keeping the thickness T1 of the first separator 3 within the above-mentioned range, the weight, space occupied, and cost of the first separator 3 can be controlled, thereby increasing the energy density of the battery pack; it can also ensure the structural strength of the battery pack, thereby enhancing the overall rigidity and impact resistance of the battery pack, making it more resistant to external pressure and impact, and protecting the internal components from damage; it can also quickly transfer heat to the external environment, improving the heat dissipation performance of the battery pack.

[0043] Furthermore, the thickness T2 of the insulation layer 7 must be neither too large nor too small. If the thickness T2 of the insulation layer 7 is too large, it may hinder the effective conduction of heat, resulting in poor temperature management. If the thickness T2 of the insulation layer 7 is too small, it may not provide sufficient electrical isolation, increasing the risk of short circuits and other electrical faults, and affecting the safety of the system.

[0044] Therefore, the thickness T2 of the insulating layer 7 is within the above range, which can prevent the insulating layer 7 from affecting the heat dissipation performance of the battery pack, improve heat dissipation efficiency, and at the same time provide effective electrical isolation protection, ensure insulation performance, effectively avoid the risk of electrical short circuit due to direct contact, and ensure the safe operation of the system.

[0045] Preferably, T1 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm or within any two of the above values, and T2 is 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm or within any two of the above values.

[0046] Furthermore, the material of the insulation layer 7 is polyethylene, polypropylene, polyvinyl chloride, polytetrafluoroethylene, ceramic materials, etc.

[0047] In one embodiment, along the first direction, the two surfaces of the first separator 3 are bonded to the sides of the corresponding individual battery cell 201; the first separator 3 is bonded to the bottom wall 101, and the second separator 4 is bonded to the bottom wall 101. The first separator 3 and the individual battery cell 201, as well as the first separator 3 and the second separator 4 and the bottom wall 101 of the housing 1, are all bonded together with adhesive. This structure is reliable and can significantly improve the overall rigidity and impact resistance of the battery pack, reducing the risk of battery damage caused by external impacts or internal pressure changes. Furthermore, the use of adhesive bonding to connect the first separator 3, the second separator 4, and the housing 1 facilitates assembly, simplifies assembly steps, and improves production efficiency.

[0048] Furthermore, the first separator 3 is bonded to the single cell 201, and the first separator 3, the second separator 4 and the bottom wall 101 of the housing 1 are bonded with structural adhesive. Structural adhesive can provide extremely high bonding strength, can form a strong connection between various materials, and this connection usually has excellent durability and is not easy to fail even in long-term use or harsh environments.

[0049] In one embodiment, such as Figure 5 and Figure 6 As shown, along a third direction perpendicular to both the first and second directions, the distance L1 between the first separator 3 and the top surface of the single cell 201 is 10mm-15mm.

[0050] Furthermore, L1 cannot be too large or too small. If L1 is too small, the creepage distance will not be met, which will increase the risk of electrical short circuit in the battery and affect the battery's safety performance. If L1 is too large, the structural strength of the first separator 3 will be low and will not meet the production requirements.

[0051] Therefore, within the above range, L1 can not only meet the creepage distance requirement, reduce the risk of electrical short circuits in the battery, and improve the battery's safety performance, but also ensure the structural strength of the first separator 3 and meet production requirements.

[0052] Preferably, L1 is 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or within any two of the above values.

[0053] Furthermore, the battery also includes a connector extending along a second direction. The connector is connected to the top surface of the first separator 3 and to the sides of two adjacent individual cells 201 along the first direction. Along a third direction, the top surface of the connector is not higher than the top surface of the individual cells 201. The first separator 3 and the individual cells 201 located on both sides of the first separator 3 are connected together by the connector. The structure is reliable and can significantly improve the overall rigidity and impact resistance of the battery pack, reducing the risk of battery damage caused by external impacts or internal pressure changes.

[0054] Furthermore, the connector is made of colloids, which have good elasticity and flexibility, and can provide additional buffer protection for the connection point during physical impact or vibration, reducing damage caused by mechanical stress.

[0055] Preferably, the adhesive is a structural adhesive, which provides extremely high bonding strength, can form a strong bond between various materials, and this bond usually has excellent durability and is not prone to failure even after long-term use or in harsh environments.

[0056] In one embodiment, such as Figure 1 and Figure 2As shown, multiple second reinforcing beams 5 are arranged within the accommodating cavity along a second direction. Each battery pack 2 is positioned between two adjacent second reinforcing beams 5. The first partition 3 abuts against or has gaps between its two ends along the second direction and the corresponding second reinforcing beams 5. The second reinforcing beams 5 can significantly increase the overall rigidity of the battery housing 1, making it more resistant to external impacts and vibrations, protecting the internal components from damage; they can also enhance the structural strength of the housing 1, effectively preventing deformation of the housing 1 caused by external pressure or internal expansion, ensuring the long-term stable operation of the battery pack 2.

[0057] Furthermore, the gap C1 between the two ends of the first partition 3 along the second direction and the corresponding second reinforcing beam 5 is 0-30mm. If this gap is too large, the structural strength of the entire battery pack will decrease, thereby affecting the impact resistance of the battery pack. Therefore, the gap is within the above range to ensure the structural strength of the entire battery pack, thereby improving the impact resistance of the battery pack.

[0058] Preferably, the gap C1 is 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, or within the range of any two of the above values.

[0059] In one embodiment, the single-cell battery 201 includes a casing and a cell. The casing is disposed on the outermost side of the cell and serves to protect the cell. The casing material can be, but is not limited to, aluminum, steel, aluminum alloy, etc. Specifically, the casing material can be aluminum-manganese alloy, aluminum-magnesium alloy, stainless steel, nickel-plated steel, carbon steel, titanium, etc.

[0060] Furthermore, the terminals, as the current output terminals of the battery, are used to connect to external busbars, etc., to realize series and parallel connections between batteries; the terminals can include positive terminals and negative terminals; the materials of the terminals can be aluminum, copper, copper-aluminum composites, etc.

[0061] Furthermore, the battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator, with the separator disposed between the positive and negative electrode sheets. The positive electrode sheet, negative electrode sheet, and separator are stacked to form the battery cell. The positive electrode sheet includes a positive current collector and a positive active material layer, and the negative electrode sheet includes a negative current collector and a negative active material layer. There are no particular limitations on the positive current collector, as long as it is conductive and will not cause adverse chemical changes in the battery. For example, it can be made of stainless steel, aluminum, nickel, titanium, sintered carbon, or aluminum or stainless steel with a surface treatment of carbon, nickel, titanium, silver, etc. The negative current collector can be made of copper, stainless steel, nickel, titanium, etc. In a specific embodiment, the positive electrode can be made of aluminum, and the negative electrode can be made of copper. The positive active material layer includes a positive active material, such as nickel-cobalt-manganese ternary materials, lithium iron phosphate materials, lithium manganese iron phosphate materials, etc.; the negative active material layer includes a negative active material, such as artificial graphite, natural graphite, silicon-based materials, etc.

[0062] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The housing (1) has a receiving cavity, the receiving cavity including a bottom wall (101) and two first side walls (102) arranged opposite to each other along a first direction; Multiple battery packs (2) are arranged between two first sidewalls (102) along the first direction, and each battery pack (2) includes multiple single cells (201) arranged along a second direction perpendicular to the first direction; A first partition (3) extends along the second direction and is disposed between two adjacent battery packs (2); The second partition (4) extends along the second direction and is disposed between the first sidewall (102) and the battery pack (2) on the outermost side along the first direction. The yield strength of the first partition (3) is greater than that of the second partition (4).

2. The battery pack according to claim 1, characterized in that, The yield strength of the first partition (3) is greater than 50 MPa.

3. The battery pack according to claim 2, characterized in that, The first partition (3) is made of metal, and the second partition (4) is made of PCM.

4. The battery pack according to any one of claims 1 to 3, characterized in that, The accommodating cavity is provided with a first reinforcing beam (6) extending along the second direction. The first reinforcing beam (6) divides the accommodating cavity into two accommodating sub-cavities. Each accommodating sub-cavity is provided with multiple battery packs (2). Along the first direction, the gap C between the battery pack (2) closest to the first reinforcing beam (6) and the first reinforcing beam (6) is 2mm-7mm.

5. The battery pack according to claim 1, characterized in that, Along the first direction, both surfaces of the first separator (3) are provided with an insulating layer (7), and the surface of the second separator (4) near the battery pack (2) is provided with an insulating layer (7).

6. The battery pack according to claim 5, characterized in that, The thickness T1 of the first partition (3) is 0.5mm-1mm, and the thickness T2 of the insulating layer (7) is 0.15mm-0.3mm.

7. The battery pack according to claim 1, characterized in that, Along the first direction, the two surfaces of the first separator (3) are bonded to the side of the corresponding single cell (201); The first partition (3) is bonded to the bottom wall (101), and the second partition (4) is bonded to the bottom wall (101).

8. The battery pack according to claim 1, characterized in that, Along a third direction perpendicular to both the first and second directions, the distance L1 between the first separator (3) and the top surface of the single cell (201) is 10mm-15mm.

9. The battery pack according to claim 8, characterized in that, The battery also includes a connector that extends along the second direction. The connector is connected to the top surface of the first separator (3) and to the sides of two adjacent individual cells (201) along the first direction. Along the third direction, the top surface of the connector is not higher than the top surface of the individual cells (201).

10. The battery pack according to claim 1, characterized in that, The cavity is provided with a plurality of second reinforcing beams (5), which are arranged along the second direction. Each battery pack (2) is disposed between two adjacent second reinforcing beams (5). The first partition (3) abuts against or has a gap with the corresponding second reinforcing beam (5) at both ends along the second direction.

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