Battery pack

Abstract

The utility model relates to battery technical field discloses a kind of battery pack, comprising: box;Multiple electric core, along X direction and side by side setting in box, electric core has a pair of big face along X direction relative setting;First limiting piece, between the big face of two adjacent electric core and with the big face of adjacent two electric core adhesive connection is equipped;Along Z direction, first limiting piece and the edge between big face leave first interval a;Along Y direction, first limiting piece and the edge between big face leave second interval b.The utility model is directly to the electric core along X direction and side by side by setting first limiting piece between the big face of two adjacent electric core and using adhesive connection, can form stable constraint, effectively limit electric core in external vibration, jolt etc. Interference under Y direction and Z direction relative displacement, reduce the electrical connection loosening, heat management failure etc.

Description

Technical Field

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

[0002] Currently, battery packs are commonly used as the core power source for new energy vehicles. Specifically, during battery pack use, they are subject to various complex factors, such as continuous vibration, bumps, and impacts during vehicle operation. Under these influences, the relative positions of multiple cells may change, leading to a shortened lifespan of the battery pack itself. Therefore, maintaining a relatively stable positional relationship among the multiple cells within the battery pack under these operating conditions is crucial. A common solution is to fill adjacent cells with polymer foam material, using the material's physical constraints to fix the cell positions. However, in practical applications, there are instances where the relative positions of the polymer foam material and the cells are poorly designed, failing to effectively restrict relative movement between adjacent cells. Utility Model Content

[0003] In view of this, the present invention provides a battery pack to solve the problem that the conventional battery pack is prone to relative movement of multiple cells under external interference due to unreasonable design of the relative positions of the polymer foam material and the battery cells.

[0004] This utility model provides a battery pack, comprising: Box; Multiple battery cells are arranged side by side in the housing along the X direction, and each battery cell has a pair of large surfaces arranged opposite each other along the X direction. A first limiting member is disposed between the large surfaces of two adjacent battery cells and is bonded to the large surfaces of the two adjacent battery cells; along the Z direction, a first gap a is left between the first limiting member and the edge of the large surface; along the Y direction, a second gap b is left between the first limiting member and the edge of the large surface.

[0005] Beneficial Effects: This invention, by setting a first limiting member between the large surfaces of two adjacent battery cells and using adhesive bonding, can directly form a stable constraint on battery cells arranged side by side along the X direction. This effectively limits the relative displacement of the battery cells along the Y and Z directions under external vibrations, bumps, and other disturbances, fundamentally reducing problems such as loose electrical connections and thermal management failures caused by changes in battery cell position. Simultaneously, by setting the first limiting member between two adjacent battery cells, a gap is created between them. This not only provides sufficient buffer space for the thermal expansion generated by the battery cells during charge and discharge cycles but also allows this gap to form a heat dissipation channel for the battery cells, preventing localized heat accumulation and temperature imbalance. Furthermore, the first gap 'a' reserved in the Z direction and the second gap 'b' reserved in the Y direction prevent the first limiting member from deforming under pressure and extending beyond the large surface of the battery cell, thus preventing interference with the peripheral structural components of the battery cells. In addition, the adhesive connection method can enhance the bonding stability between the first limiting component and the battery cell, further ensuring that multiple battery cells maintain a relatively stable positional relationship under complex working conditions, and ultimately improving the overall performance stability and service life of the battery pack.

[0006] In one optional embodiment, the first limiting member includes a plurality of limiting strips spaced apart along the Z direction and extending along the Y direction; along the Z direction, the upper limiting strip is separated from the upper edge of the large surface by a first gap a; the lower limiting strip is also separated from the lower edge of the large surface by a first gap a; along the Y direction, the end of the limiting strip is separated from the edge of the large surface by a second gap b.

[0007] Beneficial Effects: This utility model designs the first limiting member as multiple limiting strips spaced apart along the Z-direction. This not only creates a "multi-point distributed constraint" between adjacent cell surfaces through multiple sets of limiting strips, further improving the precision of limiting cell displacement compared to an integral limiting member, but also avoids cell loosening caused by the failure of a single limiting structure, enhancing constraint stability. Simultaneously, the spaced limiting strips reduce the contact area between the first limiting member and the cell surface, reducing the binding stress on the cell surface when the cell expands or contracts due to temperature changes, thus reducing the risk of structural damage caused by uneven stress. Furthermore, the gaps between the limiting strips—a first gap in the Z-direction and a second gap in the Y-direction—complement each other, further widening the heat dissipation channels between cells and improving the uniformity of temperature control. Moreover, the design of reserving the first gap a and the second gap b comprehensively prevents the limiting strips from extending beyond the cell surface after compression deformation, preventing structural interference between the limiting strips and other components within the battery pack, ensuring overall structural safety and electrical insulation.

[0008] In one optional embodiment, the battery cell is a blade battery cell, and the value of the first interval a is in the range of 1mm≤a≤15mm; and / or, the value of the second interval b is in the range of 1mm≤b≤35mm.

[0009] Beneficial effects: By setting the lower limit of the first interval a to 1mm, this invention ensures that the first limiting member will not extend beyond the large surface of the battery cell in the Z direction when deformed under pressure, thus avoiding interference with other components (such as the housing and wiring harness) within the battery pack. Setting the upper limit of the first interval a to 15mm prevents the limit member from having insufficient constraint force on the battery cell due to excessive spacing, thus balancing structural safety and constraint stability. Similarly, setting the lower limit of the second interval b to 1mm ensures that the first limiting member will not extend beyond the large surface of the battery cell in the Y direction when deformed under pressure, thus avoiding interference with other components (such as the housing and wiring harness) within the battery pack. Setting the upper limit of the second interval b to 35mm prevents excessive spacing from weakening the constraint force, thus balancing safety and stability.

[0010] In one optional embodiment, the battery cell is a square battery cell, and the value of the first interval a is in the range of 1mm≤a≤25mm; and / or, the value of the second interval b is in the range of 2mm≤b≤15mm.

[0011] Beneficial effects: This utility model sets the first interval 'a' to 1mm ≤ a ≤ 25mm. The minimum interval of 1mm prevents the first limiting member from deforming beyond the large surface of the battery cell under pressure, thus preventing interference with components such as the battery pack housing and brackets. The maximum interval of 25mm provides sufficient buffer space for the thermal expansion of the square battery cell along the Z direction, preventing the battery cell from deforming its casing or damaging its terminals due to expansion and compression, and ensuring the structural integrity of the battery cell. The second interval 'b' is set to 2mm ≤ b ≤ 15mm, which is suitable for the small thermal expansion of the square battery cell along the Y direction. The minimum interval of 2mm can strengthen the constraint of the limiting member on the Y direction of the battery cell, preventing the square battery cell from moving along this direction under vibration and impact. The maximum interval of 15mm can balance the constraint and thermal management requirements, leaving a flow channel for heat dissipation media (such as thermal pads and airflow), avoiding heat accumulation between battery cells and maintaining temperature consistency.

[0012] In one optional embodiment, the first limiting member includes an annular limiting strip, which is arranged around the large surface of the battery cell.

[0013] Beneficial effects: This utility model designs the first limiting member as an annular limiting strip surrounding the large surface of the battery cell, which can form a "full circumferential wrapping constraint" between the large surfaces of two adjacent battery cells. Compared with the distributed limiting structure, it can significantly improve the constraint stability of the overall position of the battery cell, and can effectively resist the circumferential movement of the battery cell under vibration and impact conditions. At the same time, the annular structure can evenly distribute the constraint stress on the edge of the large surface of the battery cell through continuous circumferential contact, avoiding damage to the battery cell shell caused by local stress concentration, and adapting to the uniform expansion characteristics of the battery cell during charging and discharging.

[0014] In one optional embodiment, the battery cell is a pouch cell, which includes an electrode assembly and a cell encapsulation film wrapped around the outside of the electrode assembly. The annular limiting strip is disposed on the outside of the cell encapsulation film, and at least a portion of the annular limiting strip is disposed on the area of ​​the cell encapsulation film corresponding to the electrode assembly.

[0015] Beneficial effects: The present invention sets the annular limiting strip into an annular structure, which can form a full circumferential constraint on the soft-pack battery cell and effectively limit the overall displacement of the battery cell in the Y and Z directions under vibration and impact conditions.

[0016] In one optional embodiment, the cell encapsulation film forms an encapsulation edge around the electrode assembly; along the Y direction, the width of the portion of the annular limiting strip extending onto the encapsulation edge is c, where c ranges from 1.5mm ≤ c ≤ 5mm; and / or, along the Z direction, a third interval d is left between the annular limiting strip and the edge of the corresponding electrode assembly, where d ranges from 0mm ≤ d ≤ 3mm.

[0017] Beneficial effects: Along the Y direction, this invention limits the width c to 1.5mm ≤ c ≤ 5mm. The minimum width of 1.5mm ensures effective coverage and support of the sealing edge by the limiting strip, enhancing the constraint on the pouch cell along the Y direction and preventing seal failure due to tensile stress during vibration. The maximum width of 5mm avoids excessive coverage of the sealing edge, preventing additional stress caused by differences in thermal shrinkage and expansion characteristics between the limiting strip and the sealing edge. It also provides sufficient deformation space for the sealing edge to accommodate volume changes during charging and discharging of the pouch cell. Along the Z direction, this invention limits the third interval d to 0mm ≤ d ≤ 3mm. This ensures basic support in the Z direction, strengthening the integrity of the overall constraint, and avoids interference with components around the pouch cell.

[0018] In one alternative embodiment, along the X direction, a second limiting member is bonded between the inner sidewall of the housing and the large surface of the adjacent battery cell, wherein the first limiting member and the second limiting member are made of the same material.

[0019] Beneficial effects: This utility model, by setting a second limiting member between the inner side wall of the housing and the large surface of the adjacent battery cell and using adhesive connection, can form an additional lateral constraint on the edge battery cell. It forms an "internal and external synergistic" fixing system with the first limiting member between the adjacent battery cells, thereby improving the overall positional stability of multiple battery cells in the housing and effectively resisting the risk of overall displacement under external vibration and impact. At the same time, the first and second limiting members are made of the same material, which can ensure that they have consistent deformation characteristics and aging rate under temperature changes and vibration stress, avoiding the imbalance of constraint force due to material differences.

[0020] In one alternative embodiment, the first limiting member is made of one of silicone, polyurethane, polypropylene, or rubber.

[0021] Beneficial Effects: This invention selects any one of silicone, polyurethane, polypropylene, and rubber as the material for the first limiting component, which can fully adapt to the working environment and functional requirements of the battery pack. Specifically, silicone and rubber have excellent elasticity and resistance to high and low temperatures, maintaining stable buffering performance within a temperature range of -40℃ to 150℃, effectively absorbing vibration and impact energy, while also possessing good insulation to avoid electrical interference between battery cells; polyurethane material has adjustable hardness and is wear-resistant and aging-resistant, maintaining structural stability under long-term stress, suitable for the long-term charge-discharge cycle usage scenarios of the battery pack; polypropylene is lightweight, high-strength, and low-cost, and has good chemical stability, not reacting with the battery cell casing or electrolyte, ensuring the chemical safety of the battery pack.

[0022] In one optional embodiment, the first limiting member is bonded to the battery cell with an adhesive, and the thickness of the adhesive is no more than 1 mm along the X direction.

[0023] Beneficial effects: This utility model bonds the first limiting member to the battery cell with an adhesive with a thickness of no more than 1 mm. This ensures sufficient bonding strength between the first limiting member and the large surface of the battery cell, preventing the limiting member from falling off under vibration, impact, and other conditions, and effectively constraining the battery cell. Furthermore, by controlling the adhesive thickness, it avoids reducing the effective spacing between battery cells due to an excessively thick adhesive layer, ensuring the buffer space required for thermal expansion of the battery cell, while reducing the amount of adhesive used to lower costs. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a partial structural diagram of a battery pack according to an embodiment of the present utility model; Figure 2 for Figure 1 A schematic diagram of the battery pack from another perspective; Figure 3 This is an exploded view of a portion of the battery pack structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the assembly of the blade battery cell and the first limiting component; Figure 5 This is a schematic diagram of the assembly of the square battery cell and the first limiting component; Figure 6 This is a schematic diagram of the assembly of the pouch cell and the first limiting component.

[0026] Explanation of reference numerals in the attached figures: 1. Battery cell; 101. Large surface; 102. Battery cell encapsulation film; 1021. Encapsulation edge; 2. First limiting component; 201. Limiting strip; 202. Annular limiting strip; 3. Housing. Detailed Implementation

[0027] 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.

[0028] To address the problem that multiple cells within a battery pack are prone to relative movement under external interference, this invention provides a battery pack.

[0029] The following is combined Figures 1 to 6 This describes embodiments of the present invention. For ease of description below, as follows... Figure 1 As shown, a spatial rectangular coordinate system is established: the height direction of the battery pack is denoted as the Z direction, the length direction of the battery pack is denoted as the Y direction, and the width direction (or thickness direction) of the battery pack is denoted as the X direction.

[0030] According to an embodiment of the present invention, a battery pack is provided, such as... Figures 1 to 3 As shown, it includes: a housing 3, multiple battery cells 1, and a first limiting member 2.

[0031] Specifically, multiple battery cells 1 are arranged side by side in the housing 3 along the X direction, and each battery cell 1 has a pair of large surfaces 101 arranged opposite each other along the X direction; a first limiting member 2 is disposed between the large surfaces 101 of two adjacent battery cells 1 and is bonded to the large surfaces 101 of two adjacent battery cells 1; along the Z direction, a first gap a is left between the first limiting member 2 and the edge of the large surface 101; along the Y direction, a second gap b is left between the first limiting member 2 and the edge of the large surface 101.

[0032] This embodiment of the invention, by setting a first limiting member 2 between the large surfaces 101 of two adjacent battery cells 1 and using adhesive connection, can directly form a stable constraint on the battery cells 1 arranged side by side along the X direction, effectively limiting the relative displacement of the battery cells 1 along the Y and Z directions under external vibration, bumps and other disturbances, fundamentally reducing problems such as loose electrical connections and thermal management failure caused by changes in the position of the battery cells 1. At the same time, by setting the first limiting member 2 between two adjacent battery cells 1, the two adjacent battery cells 1 can be spaced apart. In this way, not only is sufficient buffer space provided for the thermal expansion generated by the battery cells 1 during charge and discharge cycles, but the gap can also form a heat dissipation channel for the battery cells 1, avoiding local heat accumulation and temperature imbalance of the battery cells 1. The first gap a reserved in the Z direction and the second gap b reserved in the Y direction of this invention can prevent the first limiting member 2 from deforming under pressure and extending out of the large surface 101 of the battery cells 1, and prevent the first limiting member 2 from interfering with the peripheral structural components of the battery cells 1. In addition, the adhesive connection method can enhance the bonding stability between the first limiting member 2 and the battery cell 1, further ensuring that multiple battery cells 1 always maintain a relatively stable positional relationship under complex working conditions, and ultimately improving the overall performance stability and service life of the battery pack.

[0033] According to one embodiment of the present invention, such as Figures 1 to 5As shown, the first limiting member 2 includes a plurality of limiting strips 201 spaced apart along the Z direction and extending along the Y direction; along the Z direction, the upper limiting strip 201 is separated from the upper edge of the large surface 101 by a first gap a; the lower limiting strip 201 is also separated from the lower edge of the large surface 101 by a first gap a; along the Y direction, the end of the limiting strip 201 is separated from the edge of the large surface 101 by a second gap b. It is understood that in this embodiment of the utility model, the first limiting member 2 is designed as multiple limiting strips 201 spaced apart along the Z direction. This not only forms a "multi-point distributed constraint" between the large surfaces 101 of adjacent cells 1 through multiple sets of limiting strips 201, which further improves the limiting accuracy of the displacement of the cells 1 compared to an integral limiting member, avoids the loosening of the cells 1 caused by the failure of a single limiting structure, and enhances the stability of the constraint, but also reduces the contact area between the first limiting member 2 and the large surface 101 of the cells 1. When the cells 1 undergo thermal expansion or contraction due to temperature changes, the binding stress of the limiting member on the surface of the cells 1 is reduced, reducing the risk of structural damage to the cells 1 caused by uneven stress. In addition, the gaps between the limiting strips 201, with the first gap a reserved in the Z direction and the second gap b reserved in the Y direction, complement each other, further widening the heat dissipation channel between the cells 1 and improving the uniformity of temperature control. In addition, the design of reserving the first interval a and the second interval b can completely prevent the limit strips 201 from extending out of the large surface 101 of the battery cell 1 after being deformed by pressure, prevent the limit strips 201 from interfering with the structure of other components in the battery pack, and ensure the overall structural safety and electrical insulation.

[0034] According to one embodiment of the present invention, such as Figure 4 As shown, cell 1 is a blade cell, and the value of the first interval a ranges from 1mm ≤ a ≤ 15mm; and / or, the value of the second interval b ranges from 1mm ≤ b ≤ 35mm. It can be understood that setting the lower limit of the first interval a to 1mm ensures that the first limiting member 2 will not extend beyond the large surface 101 of cell 1 in the Z direction when subjected to pressure deformation, thus avoiding interference with other components (such as the housing 3 and wiring harness) within the battery pack. Setting the upper limit of the first interval a to 15mm prevents the interval from being too large, resulting in insufficient constraint force on cell 1, thus balancing structural safety and constraint stability. Similarly, setting the lower limit of the second interval b to 1mm ensures that the first limiting member 2 will not extend beyond the large surface 101 of cell 1 in the Y direction when subjected to pressure deformation, thus avoiding interference with other components (such as the housing 3 and wiring harness) within the battery pack. Setting the upper limit of the second interval b to 35mm prevents the interval from being too large, thus weakening the constraint force and balancing safety and stability.

[0035] It should be noted that, in this embodiment, the value of the first interval 'a' can be, but is not limited to, 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, or any value between two of these. Similarly, the value of the second interval 'b' can be, but is not limited to, 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 18mm, 20mm, 23mm, 25mm, 27mm, 29mm, 31mm, 33mm, 35mm, or any value between two of these.

[0036] It should be noted that in this embodiment, the values ​​of the first interval a and the second interval b are both the initial assembly state of the limit strip 201, that is, the state before it is squeezed and deformed.

[0037] According to one embodiment of the present invention, such as Figure 5 As shown, cell 1 is a square cell, and the value of the first interval a is in the range of 1mm≤a≤25mm; and / or, the value of the second interval b is in the range of 2mm≤b≤15mm. It is understood that in this embodiment of the utility model, the first interval a is set to 1mm≤a≤25mm. The minimum interval of 1mm prevents the first limiting member 2 from deforming under pressure and extending beyond the large surface 101 of the cell 1, thus preventing interference with the internal components of the battery pack, such as the casing 3 and the bracket. The maximum interval of 25mm provides sufficient buffer space for the thermal expansion of the square cell along the Z direction, preventing the cell 1 from deforming its outer shell or damaging its terminals due to expansion and compression, thus ensuring the structural integrity of the cell 1. The second interval b is set to 2mm≤b≤15mm, which is suitable for the small thermal expansion of the square cell along the Y direction. The minimum interval of 2mm can strengthen the constraint of the limiting member on the cell in the Y direction, preventing the square cell from moving along this direction under vibration and impact. The maximum interval of 15mm can balance the constraint and thermal management requirements, providing a flow channel for heat dissipation medium (such as thermal pads and airflow), avoiding heat accumulation between cells 1, and maintaining temperature consistency.

[0038] It should be noted that, in this embodiment, the value of the first interval 'a' can be, but is not limited to, 1mm, 3mm, 5mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 18mm, 20mm, 23mm, 25mm, or any value between two of these. Similarly, the value of the second interval 'b' can be, but is not limited to, 2mm, 3mm, 5mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, or any value between two of these.

[0039] It should be noted that in this embodiment, the values ​​of the first interval a and the second interval b are both the initial assembly state of the limit strip 201, that is, the state before it is squeezed and deformed.

[0040] According to one embodiment of the present invention, such as Figure 6 As shown, the first limiting member 2 includes an annular limiting strip 202, which surrounds the large surface 101 of the battery cell 1. It can be understood that in this embodiment of the invention, the first limiting member 2 is designed as an annular limiting strip 202 surrounding the large surface 101 of the battery cell 1, forming a "full circumferential wrapping constraint" between adjacent large surfaces 101 of the battery cell 1. Compared to a distributed limiting structure, this significantly improves the constraint stability of the overall position of the battery cell 1, especially effectively resisting the circumferential movement of the battery cell 1 under vibration and impact conditions. Simultaneously, the annular structure, through continuous circumferential contact, can evenly distribute the constraint stress at the edge of the large surface 101 of the battery cell 1, avoiding damage to the battery cell 1's outer shell caused by localized stress concentration, and adapting to the uniform expansion characteristics of the battery cell 1 during charging and discharging.

[0041] According to one embodiment of the present invention, such as Figure 6 As shown, cell 1 is a pouch cell, which includes an electrode assembly and a cell encapsulation film 102 wrapped around the electrode assembly. An annular limiting strip 202 is disposed on the outside of the cell encapsulation film 102, with at least a portion of the annular limiting strip 202 located on the area of ​​the cell encapsulation film 102 corresponding to the electrode assembly. It can be understood that in this embodiment of the invention, the annular limiting strip 202 is configured in an annular structure, which can form a full circumferential constraint on the pouch cell, effectively limiting the overall displacement of cell 1 along the Y and Z directions under vibration and impact conditions.

[0042] According to one embodiment of the present invention, such as Figure 6 As shown, the cell encapsulation film 102 forms an encapsulation edge 1021 around the electrode group. Along the Y direction, the width of the portion of the annular limiting strip 202 extending onto the encapsulation edge 1021 is c, and the value of c ranges from 1.5mm to 5mm. And / or, along the Z direction, a third interval d is left between the annular limiting strip 202 and the edge of the corresponding electrode group, and the value of d ranges from 0mm to 3mm. It is understood that, along the Y direction, this embodiment of the invention limits the width c to 1.5mm ≤ c ≤ 5mm. This minimum width of 1.5mm ensures that the limiting strip 201 effectively covers and supports the encapsulation edge 1021, enhancing the constraint on the soft-pack battery cell along the Y direction and preventing seal failure due to tensile stress on the encapsulation edge 1021 during vibration. Simultaneously, the maximum width of 5mm avoids excessive coverage of the encapsulation edge 1021, preventing additional stress caused by differences in thermal shrinkage and expansion characteristics between the limiting strip 201 and the encapsulation edge 1021. Sufficient deformation space is also reserved for the encapsulation edge 1021 to accommodate volume changes during charging and discharging of the soft-pack battery cell. Along the Z direction, this embodiment of the invention limits the third interval d to 0mm ≤ d ≤ 3mm. This ensures basic support in the Z direction, strengthening the integrity of the overall constraint, while also preventing interference with components around the soft-pack battery cell.

[0043] It should be noted that, in this embodiment, the value of c can be, but is not limited to, 1.5mm, 1.7mm, 2mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or any value between two of these. Similarly, the value of d can be, but is not limited to, 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any value between two of these.

[0044] It should be noted that in this embodiment, the values ​​of c and d are both the initial assembly state of the limit strip 201, that is, the state before it is squeezed and deformed.

[0045] According to one embodiment of this utility model, along the X direction, a second limiting member is bonded between the inner wall of the housing 3 and the large surface 101 of the adjacent battery cell 1. The first limiting member 2 and the second limiting member are made of the same material. It can be understood that by setting the second limiting member between the inner wall of the housing 3 and the large surface 101 of the adjacent battery cell 1 and using adhesive connection, this embodiment of the utility model can form an additional lateral constraint on the edge battery cell 1, forming an "internal and external cooperative" fixing system with the first limiting member 2 between the adjacent battery cells 1. This improves the overall positional stability of multiple battery cells 1 within the housing 3 and effectively resists the risk of overall displacement under external vibration and impact. At the same time, the first limiting member 2 and the second limiting member are made of the same material, which can ensure that they have consistent deformation characteristics and aging rate under temperature changes and vibration stress, avoiding imbalance of constraint force due to material differences.

[0046] According to one embodiment of this utility model, the first limiting member 2 is a foamed material, and the foamed material is one of silicone, polyurethane, polypropylene, and rubber. It can be understood that this embodiment of the utility model selects any one of silicone, polyurethane, polypropylene, and rubber as the material of the first limiting member 2, which can fully adapt to the working environment and functional requirements of the battery pack. Specifically, silicone and rubber have excellent elasticity and resistance to high and low temperatures, maintaining stable buffering performance within a range of -40℃ to 150℃, effectively absorbing vibration and impact energy, while also possessing good insulation properties to avoid electrical interference between the battery cells 1; polyurethane material has adjustable hardness and is wear-resistant and aging-resistant, maintaining structural stability under long-term stress, suitable for the long-term charge-discharge cycle usage scenario of the battery cell pack; polypropylene has the characteristics of being lightweight, high-strength, and low-cost, and has good chemical stability, not reacting with the battery cell 1 casing or electrolyte, ensuring the chemical safety of the battery pack.

[0047] In one embodiment, the rubber is EPDM rubber or chloroprene rubber.

[0048] According to one embodiment of the present invention, the first limiting member 2 is bonded to the battery cell 1 with an adhesive, and the thickness of the adhesive along the X direction is no more than 1 mm. It can be understood that by bonding the first limiting member 2 to the battery cell 1 with an adhesive no more than 1 mm thick, the present invention ensures sufficient bonding strength between the first limiting member 2 and the large surface 101 of the battery cell 1, ensuring that the limiting member does not detach under vibration, impact, or other conditions, effectively constraining the battery cell 1. Furthermore, by controlling the adhesive thickness, it avoids reducing the effective spacing between the battery cells 1 due to an excessively thick adhesive layer, ensuring the buffer space required for the thermal expansion of the battery cell 1, while simultaneously reducing the amount of adhesive used to lower costs.

[0049] 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: Box; Multiple battery cells are arranged side by side in the housing along the X direction, and each battery cell has a pair of large surfaces arranged opposite each other along the X direction. The first limiting member is disposed between the large surfaces of two adjacent battery cells and is bonded to the large surfaces of the two adjacent battery cells. Along the Z direction, a first gap a is left between the first limiting member and the edge of the large surface; Along the Y direction, a second gap b is left between the first limiting member and the edge of the large surface.

2. The battery pack according to claim 1, characterized in that, The first limiting member includes a plurality of limiting strips spaced apart along the Z direction and extending along the Y direction; along the Z direction, the upper limiting strip is separated from the upper edge of the large surface by a first gap a; the lower limiting strip is also separated from the lower edge of the large surface by a first gap a; along the Y direction, the end of the limiting strip is separated from the edge of the large surface by a second gap b.

3. The battery pack according to claim 2, characterized in that, The battery cell is a blade battery cell, and the value range of the first interval a is 1mm≤a≤15mm; and / or, the value range of the second interval b is 1mm≤b≤35mm.

4. The battery pack according to claim 2, characterized in that, The battery cell is a square battery cell, and the value of the first interval a is in the range of 1mm≤a≤25mm; and / or, the value of the second interval b is in the range of 2mm≤b≤15mm.

5. The battery pack according to claim 1, characterized in that, The first limiting member includes an annular limiting strip, which is arranged around the large surface of the battery cell.

6. The battery pack according to claim 5, characterized in that, The battery cell is a pouch cell, which includes an electrode assembly and a cell encapsulation film wrapped around the outside of the electrode assembly. The annular limiting strip is disposed on the outside of the cell encapsulation film, and at least a portion of the annular limiting strip is disposed on the area corresponding to the electrode assembly and the cell encapsulation film.

7. The battery pack according to claim 6, characterized in that, The cell encapsulation film forms an encapsulation edge around the electrode assembly; along the Y direction, the width of the portion of the annular limiting strip extending onto the encapsulation edge is c, where c ranges from 1.5mm to 5mm; and / or, along the Z direction, a third interval d is left between the annular limiting strip and the edge of the corresponding electrode assembly, where d ranges from 0mm to 3mm.

8. The battery pack according to any one of claims 1 to 7, characterized in that, Along the X direction, a second limiting member is bonded between the inner sidewall of the box and the large surface of the adjacent battery cell. The first limiting member and the second limiting member are made of the same material.

9. The battery pack according to claim 8, characterized in that, The first limiting component is made of one of the following materials: silicone, polyurethane, polypropylene, or rubber.

10. The battery pack according to any one of claims 1 to 7, characterized in that, The first limiting member is bonded to the battery cell with an adhesive, and the thickness of the adhesive is no more than 1 mm along the X direction.

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