Battery pack box and battery pack

Abstract

This utility model relates to the field of battery technology and discloses a battery pack housing and a battery pack. The battery pack housing includes a housing body, which includes a cold plate, two side beams, and a first frame. The first frame is welded between the two side beams and to the cold plate. The side beams and the cold plate have a first protruding portion extending beyond the first frame along their length direction. A first side weld between the first frame and the side beams and the edge of the first protruding portion has a first distance L1, and a second distance L2 is formed between the first bottom weld between the first frame and the cold plate and the edge of the first protruding portion. By extending the side beams and the cold plate beyond the first frame, the first side weld between the first frame and the side beams and the first bottom weld between the first frame and the cold plate are moved away from the edge of the first protruding portion, thereby improving the welding strength between the side beams, the cold plate, and the first frame. This also allows the first side weld and the first bottom weld to avoid high-stress areas, reducing the risk of weld cracking and improving the overall structural stability of the battery pack.

Description

Technical Field

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

[0002] A battery pack typically refers to an assembly of multiple individual batteries connected in series, parallel, or a combination thereof, used to provide higher voltage or capacity to meet the needs of different devices. Battery packs are widely used in portable electronic devices (such as laptops and mobile phones), electric vehicles, energy storage systems, and other fields.

[0003] Currently, battery packs mainly consist of a housing and multiple battery packs. The multiple battery packs are housed inside the housing. The housing includes a main body and a top cover. The main body has four side frames. Adjacent side frames are connected by welding. The welds are usually located at the ends of the two side frames. If the welding strength is insufficient and the stress at the weld is too high, it is easy to crack or fail, which in turn affects the structural stability of the battery pack. Utility Model Content

[0004] In view of this, the present invention provides a battery pack housing and a battery pack to solve the problem that the weld seam of the frame of the housing body is located at the edge of the frame, resulting in low welding strength.

[0005] In a first aspect, the present invention provides a battery pack housing, including a housing body, the housing body including a cold plate, two side beams and a first frame, the two side beams being disposed opposite to each other on both sides of the cold plate, the first frame being welded between the two side beams and welded to the cold plate, the side beams and the cold plate having a first protruding portion extending beyond the first frame along their length direction, a first side weld between the first frame and the side beams having a first distance L1 between the edge of the first protruding portion and the edge of the first protruding portion, and a second distance L2 between the first bottom weld between the first frame and the cold plate and the edge of the first protruding portion.

[0006] Secondly, this utility model also provides a battery pack, including: the aforementioned housing and a plurality of batteries, wherein the housing has a battery housing space and the plurality of batteries are placed in the battery housing space.

[0007] Beneficial effects: By extending the side beam and cold plate beyond the first frame, the first side weld between the first frame and the side beam, as well as the first bottom weld between the first frame and the cold plate, are moved away from the edge of the first extended portion. This improves the welding strength between the side beam, the cold plate, and the first frame, allowing the first side weld and the first bottom weld to avoid high-stress areas, reducing the risk of weld cracking, and improving the overall structural stability of the battery pack. Attached Figure Description

[0008] 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.

[0009] Figure 1 This is a partial perspective view of a battery pack according to an embodiment of the present utility model;

[0010] Figure 2 for Figure 1 The diagram shows a partial structural schematic of the battery pack.

[0011] Explanation of reference numerals in the attached figures:

[0012] 1. Box body; 101. Side beam; 1011. Bottom beam; 102. Cold plate; 103. First frame; 1031. First flange.

[0013] 201. First side weld; 202. First bottom weld; 203. First top weld. Detailed Implementation

[0014] 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.

[0015] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0016] According to an embodiment of the present invention, a battery pack housing is provided, including a housing body 1. The housing body 1 includes a cold plate 102, two side beams 101, and a first frame 103. The two side beams 101 are disposed opposite to each other on both sides of the cold plate 102. The first frame 103 is welded between the two side beams 101 and welded to the cold plate 102. The side beams 101 and the cold plate 102 have a first protruding portion extending beyond the first frame 103 along their length direction. The first side weld 201 between the first frame 103 and the side beams 101 has a first distance L1 between the edge of the first protruding portion and the edge of the first protruding portion. The first bottom weld 202 between the first frame 103 and the cold plate 102 has a second distance L2 between the edge of the first protruding portion and the edge of the first protruding portion.

[0017] In the battery pack housing of this embodiment, the side beam 101 and the cold plate 102 are positioned beyond the first frame 103, so that the first side weld 201 between the first frame 103 and the side beam 101 and the first bottom weld 202 between the first frame 103 and the cold plate 102 are far from the edge of the first protruding part. This improves the welding strength between the side beam 101, the cold plate 102 and the first frame 103, and allows the first side weld 201 and the first bottom weld 202 to avoid high stress areas, reducing the risk of weld cracking and improving the overall structural stability of the battery pack.

[0018] In one embodiment, the second distance L2 is 5mm-30mm. The second distance L2 cannot be too large or too small. If L2 is too large, the length of the cold plate 102 will be longer, the amount of material used will be greater, the cost will be higher, and the overall size of the battery pack will increase, which is not conducive to the arrangement of the battery pack. If L2 is too small, the welding strength between the cold plate 102 and the first frame 103 will be lower. When the stress at the weld is greater, the weld between the first frame 103 and the cold plate 102 is prone to cracking or failure.

[0019] Therefore, the second distance L2 is within the above range, which controls the length of the side beam 101, avoids material waste, saves costs, and also controls the size of the battery pack, making it easier to arrange the battery pack; ensuring the welding strength between the cold plate 102 and the first frame 103 can make the first bottom weld 202 avoid the high stress area, reduce the risk of weld cracking, and improve the overall structural stability of the battery pack.

[0020] Preferably, L2 is 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.

[0021] In one embodiment, the bottom side of the side beam 101 extends toward the cold plate 102 to form a bottom beam 1011. In the width direction of the housing body 1, the width W1 of the bottom beam 1011 is 15mm-30mm. W1 cannot be too large or too small. If W1 is too large, the temperature of the battery corresponding to the bottom beam 1011 will be high, causing local temperature rise, which may easily lead to thermal runaway and poor battery pack safety. If W1 is too small, the bottom beam 1011 cannot provide sufficient support stiffness, resulting in poor structural stability and easy bending or twisting under stress. For structures that need to bear the weight of the module or withstand external impact, there is a safety hazard.

[0022] Therefore, within the aforementioned range, W1 avoids localized battery overheating, ensures battery heat dissipation performance, and improves battery pack safety; it also provides sufficient supporting rigidity for the battery, resulting in high structural stability and preventing the casing from bending or twisting under stress, thus reducing safety hazards.

[0023] Preferably, W1 is 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.

[0024] In one embodiment, the first distance L1 is 5mm-30mm. The first distance L1 should not be too large or too small. If L1 is too large, the length of the side beam 101 will be longer, the amount of material used will be more, the cost will be higher, and the overall size of the battery pack will be larger, which is not conducive to the arrangement of the battery pack. If L1 is too small, the welding strength between the side beam 101 and the first frame 103 will be lower. When the stress at the weld is large, the weld between the first frame 103 and the side beam 101 is prone to cracking or failure.

[0025] Therefore, the first distance L1 is within the above range, which controls the length of the side beam 101, avoids material waste, saves costs, and also controls the size of the battery pack, making it easier to arrange the battery pack; ensuring the welding strength between the cold plate 102 and the first frame 103 can make the first side weld avoid the high stress area, reduce the risk of weld cracking, and improve the overall structural stability of the battery pack.

[0026] Preferably, L1 is 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.

[0027] In one embodiment, the top of the first frame 103 has a first flange 1031, which is welded to the side beam 101. The first flange 1031 can increase the overlap area between the first frame 103 and the side beam 101, making the weld length longer, enhancing the welding strength between the first frame 103 and the side beam 101, and improving the load-bearing capacity and deformation resistance of the entire box.

[0028] In one embodiment, the shape of the first top weld 203 between the first flange 1031 and the first frame 103 is non-linear. The non-linear first top weld 203 can lengthen the weld, significantly improving the shear and tensile strength of the connection, and increasing the welding strength between the first frame 103 and the side beam 101, thereby improving the rigidity and torsional resistance of the entire box.

[0029] In one embodiment, the first top weld 203 includes a first weld segment and a second weld segment arranged at an angle, with the first weld segment extending along the length of the box body. The first top weld 203 is zigzag-shaped, which facilitates welding operations, improves process feasibility, makes the weld path easier to program and control, makes the welding process more stable, and improves welding quality.

[0030] It is understandable that non-linear shapes can also be curved, and curved shapes can be wavy, S-shaped, etc.

[0031] In one embodiment, the length L5 of the first weld segment along the length direction of the housing is 5mm-25mm. L5 cannot be too large or too small. If L5 is too large, the length of the first flange 1031 and the side beam 101 will be too long, resulting in a large amount of material usage, higher cost, and an increased overall size of the battery pack, which is not conducive to the arrangement of the battery pack. If L5 is too small, the size of the first flange 1031 will be too small, the welding strength between the first frame 103 and the side beam 101 will be low, and the weld between the first frame 103 and the side beam 101 will be prone to cracking or failure.

[0032] Therefore, within the aforementioned range, L5 controls the length of the side beam 101 to avoid material waste and save costs, while also controlling the size of the battery pack to facilitate its arrangement; it ensures the welding strength between the cold plate 102 and the first frame 103, reduces the risk of weld cracking, and improves the overall structural stability of the battery pack.

[0033] Preferably, L5 is 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm or within any two of the above values.

[0034] In one embodiment, the housing further includes a second frame, which is disposed opposite to the first frame 103. The second frame is welded to the side beam 101 and the cold plate 102. The cold plate 102, the two side beams 101, the first frame 103, and the second frame form a receiving cavity for placing the battery. The second frame is the front frame, and the first frame 103 is the rear frame. The second frame and the first frame 103 are disposed opposite to each other to form a closed frame structure, which effectively improves the overall rigidity of the housing and ensures high reliability of the battery pack.

[0035] Furthermore, the second frame is welded between the two side beams 101 and onto the cold plate 102. The side beams 101 and the cold plate 102 have a second protruding portion extending beyond the second frame along the length direction. In the length direction, the second side weld between the second frame and the side beam 101 has a third distance L3 between the edge of the second protruding portion, and the second bottom weld between the second frame and the cold plate 102 has a fourth distance L4 between the second protruding portion. By setting the side beams 101 and the cold plate 102 to extend beyond the second frame, the second side weld between the second frame and the side beam 101 and the second bottom weld between the second frame and the cold plate 102 are located away from the edge of the second protruding portion. This increases the welding strength between the side beams 101, the cold plate 102, and the second frame, allowing the second side weld and the second bottom weld to avoid high-stress areas, reducing the risk of weld cracking, and improving the overall structural stability of the battery pack.

[0036] Furthermore, the third distance L3 is 5mm-30mm, and the fourth distance L4 is 5mm-30mm.

[0037] Preferably, L3 is 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, or 30mm, or falls within the range of any two of the above values; L4 is 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, or 30mm, or falls within the range of any two of the above values.

[0038] In one embodiment, the top of the second frame has a second flange, which is welded to the side beam 101. The second flange can increase the overlap area between the second frame and the side beam 101, making the weld length longer, enhancing the welding strength between the second frame and the side beam 101, and improving the load-bearing capacity and deformation resistance of the entire box.

[0039] Furthermore, the shape and specific structure of the second flange can be referred to the shape and specific structure of the first flange 1031, and will not be described in detail here.

[0040] In one embodiment, the housing further includes a top cover, which is disposed on the housing body 1. The top cover and the housing body 1 enclose a battery housing space. After the top cover and the housing body 1 are engaged, they form a closed structure, which can effectively prevent external environment (such as dust, moisture, foreign objects, etc.) from entering the battery. The closed structure can prevent the battery cells or modules from being directly exposed to the outside, reduce the risk of short circuits, accidental contact, and mechanical damage, and improve the safety of the battery system.

[0041] According to an embodiment of the present invention, another aspect provides a battery pack, comprising: the aforementioned housing and a plurality of batteries, wherein the housing has a battery housing space and the plurality of batteries are placed in the battery housing space.

[0042] In one embodiment, the battery housing space includes an upper battery compartment and a lower battery compartment, and the battery pack also includes an upper battery unit and a lower battery unit. The upper battery unit is disposed in the upper battery compartment, and the lower battery unit is disposed in the lower battery compartment. Both the upper battery unit and the lower battery unit include multiple battery packs, and each battery pack includes multiple batteries.

[0043] In one embodiment, a first partition and a second partition are provided within the battery housing space. The first partition divides the battery housing space into an electrical compartment and a battery compartment, and the second partition divides the battery compartment into an upper battery compartment and a lower battery compartment. The first partition physically isolates the high-voltage electrical components from the battery module, and the second partition further divides the battery compartment into upper and lower areas, facilitating optimized module layout, clear functional zoning, avoiding mutual interference, and improving the overall system's safety and reliability. Separating the electrical compartment from the battery compartment effectively prevents safety risks caused by overheating or short circuits in the conductive pads, and facilitates unified insulation protection within the electrical compartment.

[0044] In one embodiment, the battery pack also includes a battery management system and a thermal management system. The battery management system monitors and manages the status of each battery in the battery pack, including parameters such as voltage, temperature, and current, and ensures the safe operation of the entire battery pack. It can balance the charging state among the batteries and prevent overcharging, over-discharging, and overheating. Since batteries generate heat during operation, the thermal management system controls the battery's operating temperature to maintain its optimal operating temperature range, ensuring it operates within this range and avoiding performance degradation or safety hazards caused by overheating or overcooling.

[0045] 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 housing, characterized in that, The enclosure includes a box body (1), which includes a cold plate (102), two side beams (101) and a first frame (103). The two side beams (101) are disposed opposite to each other on both sides of the cold plate (102). The first frame (103) is welded between the two side beams (101) and welded to the cold plate (102). The side beams (101) and the cold plate (102) have a first overhang portion extending beyond the first frame (103) along their length direction. In the length direction, a first side weld (201) between the first frame (103) and the side beams (101) has a first distance L1 between the edge of the first overhang portion and the edge of the first overhang portion. A second distance L2 is formed between the first bottom weld (202) between the first frame (103) and the cold plate (102) and the edge of the first overhang portion.

2. The housing according to claim 1, characterized in that, The second distance L2 is 5mm-30mm.

3. The housing according to claim 1, characterized in that, The bottom side of the side beam (101) extends toward the cold plate (102) to form a bottom beam (1011). In the width direction of the box body (1), the width W1 of the bottom beam (1011) is 15mm-30mm.

4. The housing according to claim 1, characterized in that, The first distance L1 is 5mm-30mm.

5. The housing according to claim 1, characterized in that, The top of the first frame (103) has a first flange (1031), which is welded to the side beam (101).

6. The housing according to claim 5, characterized in that, The shape of the first top weld (203) between the first flange (1031) and the first frame (103) is non-linear.

7. The housing according to claim 6, characterized in that, The first top weld (203) includes a first weld segment and a second weld segment arranged at an angle, the first weld segment extending along the length direction of the box body.

8. The housing according to claim 7, characterized in that, The length L5 of the first weld segment along the length direction of the box body is 5mm-25mm.

9. The housing according to claim 1, characterized in that, The housing also includes a second frame, which is disposed opposite to the first frame (103). The second frame is welded to the side beam (101) and the cold plate (102). The cold plate (102), the two side beams (101), the first frame (103) and the second frame form a cavity for placing the battery.

10. The housing according to claim 9, characterized in that, The second frame is welded between the two side beams (101) and onto the cold plate (102). The side beams (101) and the cold plate (102) have a second overhang that extends beyond the second frame along the length direction. In the length direction, the second side weld between the second frame and the side beam (101) has a third distance L3 between the edge of the second overhang and the edge of the second overhang. The second bottom weld between the second frame and the cold plate (102) has a fourth distance L4 between the second overhang and the second overhang. The third distance L3 is 5mm-30mm and the fourth distance L4 is 5mm-30mm.

11. The housing according to claim 1, characterized in that, The enclosure also includes a top cover, which is disposed on the enclosure body (1). The top cover and the enclosure body (1) together form a battery housing space.

12. A battery pack, characterized in that, include: The housing and the plurality of batteries according to any one of claims 1 to 11, wherein the housing has a battery housing space and the plurality of batteries are placed in the battery housing space.

Images