Battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery pack, and battery pack includes: box, including bottom plate and the end edge beam being arranged in at least one side of bottom plate along first direction;Box is enclosed to form accommodating cavity;Battery module is arranged in accommodating cavity;End plate is arranged in at least one end of battery module along first direction, and end plate is between battery module and end edge beam;End edge beam includes body part, and the side of body part close to end plate extends and forms with increased height part along second direction, wherein, second direction is perpendicular to the plane where bottom plate is;The height of the side edge distance of increased height part away from bottom plate along second direction from bottom plate is H, the height of the side edge distance of end plate away from bottom plate along second direction from bottom plate is D, satisfy: H=2 / 3D.The battery pack provided by the utility model effectively increases the contact area of end plate and end edge beam, disperses impact force, reduces the risk of end plate damage.

Description

Technical Field

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

[0002] In related technologies, battery packs often adopt a box-type structure, which stores electrical energy by arranging battery modules inside the box.

[0003] The enclosure is formed by four frames, creating a space to house the battery module, which is typically formed by stacking multiple individual battery cells. Because individual battery cells tend to expand over time, the entire battery module expands as well. This increases the contact force between the battery module and the frames. Since the largest surface area of ​​each individual battery cell expands the most, the contact force between the battery module and the corresponding frame is greatest in the direction perpendicular to that surface. Under the long-term effects of this expansion force, the contact area between the battery module and the top edge of the frame is prone to damage. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem that the part of the battery module that abuts against the frame is easily damaged when it expands.

[0005] This utility model provides a battery pack, comprising:

[0006] The enclosure includes a base plate and end beams disposed on at least one side of the base plate along a first direction; the enclosure forms a receiving cavity.

[0007] The battery module is housed within the receiving cavity;

[0008] An end plate is disposed at at least one end of the battery module along a first direction, and the end plate is located between the battery module and the end side beam.

[0009] The end beam includes a body portion, and a heightening portion is formed on the side of the body portion near the end plate along a second direction, wherein the second direction is perpendicular to the plane of the bottom plate.

[0010] The height of the heightening part away from the base plate along the second direction is H, and the height of the end plate away from the base plate along the second direction is D, satisfying: H≥2 / 3D.

[0011] Beneficial effects: To prevent damage to the end plate due to impact, especially to avoid creases or even breakage at the contact point between the end plate and the top edge of the end beam, the battery pack provided in this embodiment effectively increases the contact area between the end plate and the end beam by adding a raised section to the end beam, thus dispersing the impact force and reducing the risk of end plate damage. Furthermore, by limiting the ratio of the height H of the raised section to the height D of the end plate to H≥2 / 3D, it is ensured that the end plate is adequately supported when subjected to impact, thereby preventing creases or even breakage due to excessive localized stress and extending the service life of the battery pack. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the battery pack of this utility model;

[0014] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0015] Figure 3 This is a right view of the battery pack of this utility model;

[0016] Figure 4 This is a partially enlarged view of the end beam and base plate of this utility model in their installation state;

[0017] Figure 5 This is a right view of the end beam and end plate of this utility model in their mating state;

[0018] Figure 6 This is a partially enlarged view of the end beam of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Lower housing; 2. Battery module; 3. End plate; 4. End side beam; 41. Heightening section; 42. Main body; 421. Mounting wall; 43. Support section; 431. Extension wall; 432. Supporting wall; 5. Connector; 6. Fastener; 7. Base plate. Detailed Implementation

[0021] 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.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] In related technologies, battery packs often adopt a box-type structure, storing electrical energy by arranging battery modules inside the box. The box is enclosed by four frames to form a storage space for the battery modules, which are typically formed by stacking multiple individual battery cells. Because individual battery cells tend to expand over long-term use, the entire battery module expands as well, increasing the contact force between the battery module and the frame. Since the largest surface area of ​​the individual battery cells expands the most, the contact force between the battery module and the corresponding frame in the direction perpendicular to the largest surface area is the greatest; the frame corresponding to the battery module in this direction perpendicular to the largest surface area is the end beam. Under the long-term expansion force, the contact area between the battery module and the top edge of the end beam is prone to damage.

[0026] In some battery packs, an end plate is installed between the battery module and the frame for insulation and structural reinforcement. The height of the end plate is generally flush with the height of the individual battery cell. However, under long-term expansion forces, the area where the end plate abuts against the top edge of the frame is also prone to damage or even breakage.

[0027] Furthermore, under frequent vibration conditions, battery shaking can generate impact forces between the end plate and the end beam. The stress is greatest at the point where the end plate contacts the top edge of the end beam, making it prone to creases or even breakage. End plate breakage not only affects the overall stability of the battery pack but may also cause safety hazards such as short circuits. In severe cases, it can even lead to battery pack failure, thereby affecting the normal operation and lifespan of the battery pack.

[0028] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, a battery pack is provided, comprising:

[0030] The box body includes a base plate 7 and an end beam 4 disposed on at least one side of the base plate 7 along a first direction; the box body encloses and forms a receiving cavity;

[0031] Battery module 2 is disposed within the receiving cavity;

[0032] End plate 3 is disposed at at least one end of battery module 2 along the first direction, and end plate 3 is located between battery module 2 and end side beam 4;

[0033] The end beam 4 includes a body part 42, and the body part 42 extends along a second direction to form a heightening part 41 on the side near the end plate 3, wherein the second direction is perpendicular to the plane of the bottom plate 7.

[0034] The height of the rising part 41 away from the bottom plate 7 along the second direction is H, and the height of the end plate 3 away from the bottom plate 7 along the second direction is D, satisfying: H≥2 / 3D.

[0035] The battery pack casing forms a cavity, within which the battery module 2 is housed. Through electrical connections, the battery module 2 is connected to an external circuit, enabling charging and discharging. The casing serves to constrain and protect the battery module 2, ensuring its integrity and providing physical protection against external impacts.

[0036] The housing includes a base plate 7 and end beams 4 disposed on at least one side of the base plate 7 along a first direction. Specifically, the base plate 7 is provided with end beams 4 on both sides along the first direction. The end beams 4 are fixed to the base plate 7 by welding or bolts. Longitudinal beams can also be connected between the end beams 4 on both sides to form a frame structure, thereby enhancing the overall rigidity of the housing and facilitating the constraint of the battery module 2.

[0037] An end plate 3 for insulation and structural reinforcement is also provided between the battery module 2 and the end beam 4. Under frequent vibration conditions, the shaking of the battery module 2 will cause impact force between the end plate 3 and the end beam 4. In order to avoid damage to the end plate 3 due to impact force, especially to avoid creases or even breakage at the contact point between the end plate 3 and the top edge of the end beam 4, the battery pack provided in this embodiment effectively increases the contact area between the end plate 3 and the end beam 4 by adding a heightening part 41 to the end beam 4, thereby dispersing the impact force and reducing the risk of damage to the end plate 3.

[0038] By limiting the ratio between the height H of the height-increasing part 41 and the height D of the end plate 3 to H≥2 / 3D, the end plate 3 can be adequately supported when subjected to impact, thereby preventing the end plate 3 from creases or even breakage due to excessive local stress and extending the service life of the battery pack.

[0039] Specifically, the end beam 4 includes a body part 42, and a heightening part 41 is formed on the side of the body part 42 near the end plate 3 along the second direction. Both the body part 42 and the heightening part 41 are closely fitted with the end plate 3, thereby forming a multi-layer support structure for the end plate 3 and further enhancing the impact resistance of the end plate 3.

[0040] It should be noted that the first direction refers to the length direction of the battery module 2, which can be the direction of battery stacking; the second direction can be the height direction of the battery module 2, which can be the direction perpendicular to the plane where the base plate 7 is located; further, the third direction can refer to the width direction of the battery module 2. In this embodiment, the third direction is perpendicular to the first and second directions.

[0041] In some embodiments, combined with Figure 4 , Figure 6 As shown, the end beam 4 also includes a support portion 43, one side of which is connected to the main body portion 42 and the other side is connected to the heightening portion 41. The support portion 43 is adapted to provide support for the heightening portion 41.

[0042] The support part 43 further enhances the overall stability of the end beam 4, ensuring that the heightening part 41 is not easily deformed when subjected to impact, further dispersing the impact force, and ensuring that the contact between the end plate 3 and the heightening part 41 is more stable under complex working conditions, thus better protecting the end plate 3.

[0043] As an optional implementation, the support portion 43 can be a reinforcing rib structure supporting the heightening portion 41 and the main body portion 42, thereby forming a stable triangular support between the heightening portion 41 and the main body portion 42. This enhances the stability of the heightening portion 41, improves its resistance to deformation, and further ensures the structural integrity of the end plate 3 in complex vibration environments. It also prevents the end plate 3 from creased or even broken due to excessive local stress, extending the overall service life of the battery pack. Furthermore, the structural form of the support portion 43 can be optimized according to actual needs to adapt to different vibration frequencies and amplitudes, ensuring that the end plate 3 is effectively protected under any circumstances, thereby further improving the safety and reliability of the battery pack.

[0044] In some embodiments, combined with Figure 6 As shown, the support portion 43 includes an extension wall 431 and a support wall 432. The extension wall 431 is formed by extending along a second direction from the side of the main body portion 42 away from the end plate 3. The support wall 432 is connected between the extension wall 431 and the heightening portion 41.

[0045] The extended wall 431 and the supporting wall 432 form a stable L-shaped structure, which effectively ensures the support of the heightened part 41, prevents it from bending or deforming when subjected to impact, further improves the overall rigidity and impact resistance of the end beam 4, effectively disperses the impact force, enhances the overall rigidity of the end beam 4, and thus ensures that the end plate 3 can maintain structural stability under various extreme working conditions, and extends the service life of the battery pack.

[0046] Meanwhile, the thickness and angle of the support wall 432 can be adjusted according to the actual stress and spatial layout requirements. On the one hand, this facilitates the achievement of optimal support effect, and on the other hand, it allows for the installation and support of other components of the battery pack, thus optimizing space utilization.

[0047] In some embodiments, combined with Figure 5 As shown, the length of the support part 43 along the third direction is L1, and the length of the end beam 4 along the third direction is L2, satisfying: 0.5≤L1 / L2≤0.8, wherein the third direction is parallel to the plane where the bottom plate 7 is located and perpendicular to the first direction.

[0048] By rationally setting the ratio between L1 and L2, the support part 43 is ensured to cover the key stress area of ​​the end beam 4, which avoids over-design and ensures that the support part 43 provides effective support for the heightening part 41. This ensures that the end plate 3 can be fully supported when it is subjected to impact. In addition, it also facilitates the installation of the fastener 6 and optimizes the structural layout.

[0049] In some embodiments, the area where the end beam 4 is not provided with the support 43 in the third direction forms an avoidance area;

[0050] The battery pack also includes a fixing member 6, which is located in the clearance area and is used to fix the end side beam 4 to the base plate 7.

[0051] By rationally setting up the clearance area, flexible space is provided for the installation of the fastener 6, making it easy to hide the fastener 6 along the second direction within the clearance area and avoiding the fastener 6 occupying too much vertical space. At the same time, the clearance area design can also effectively reduce the interference of the fastener 6 with other components inside the battery pack, ensuring the rational use of the internal space of the battery pack and the compactness of the overall structure, further improving the stability and safety of the battery pack.

[0052] In some embodiments, combined with Figure 6 As shown, a mounting wall 421 is formed on the side of the main body 42 away from the base plate 7. The mounting wall 421 is provided with mounting holes, and the fastener 6 passes through the mounting holes.

[0053] The side of the main body 42 away from the base plate 7 forms a mounting wall 421, thereby ensuring that the fastener 6 is tightly connected to the main body 42 and enhancing the stability of the overall structure.

[0054] In some embodiments, the avoidance area is formed at least at both ends of the end beam 4 along a third direction.

[0055] By ensuring that the clearance area is formed at least at both ends of the end beam 4 along a third direction, it is convenient to install the fasteners 6 at both ends of the end beam 4, thus ensuring a firm connection.

[0056] In some embodiments, along the first direction, the thickness of the heightened portion 41 is less than the thickness of the end side beam 4.

[0057] In some embodiments, the heightening portion 41 is a thin-walled structure.

[0058] By adopting a thin-walled structure, the heightening section 41 can reduce the overall weight while maintaining sufficient strength and rigidity, ensuring that the end plate 3 can be fully supported when subjected to impact.

[0059] In some embodiments, combined with Figure 2 As shown, the battery pack also includes a connector 5, which is adapted to be installed on the support 43.

[0060] The support part 43 can provide support for the heightening part 41 on the one hand, and provide a stable installation platform for the connector 5 on the other hand. The space of the support part 43 is used as the installation base for the connector 5, which simplifies the structural design and reduces the number of components.

[0061] In some embodiments, the end beam 4 is an integrally formed structure.

[0062] The end beam 4 can be formed by injection molding or die casting to ensure structural integrity and strength, reduce assembly steps, and improve production efficiency.

[0063] In some embodiments, combined with Figure 1 , Figure 2 As shown, the box body includes two sub-boxes distributed along the second direction, with the bottom plate 7 located between the two sub-boxes and the end side beam 4 located in the upper sub-box.

[0064] The end beam 4 in this embodiment can be well applied to a double-layer battery pack. While meeting the requirements of lightweighting, it ensures the structural stability of the upper sub-box and ensures that the end plate 3 can be fully supported when subjected to impact, thereby avoiding creases or even breakage of the end plate 3 due to excessive local stress and extending the service life of the battery pack.

[0065] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. 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 all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery pack, characterized in that, include: The box body includes a bottom plate (7) and an end beam (4) disposed on at least one side of the bottom plate (7) along a first direction; the box body encloses and forms a receiving cavity; A battery module (2) is disposed within the receiving cavity; An end plate (3) is disposed at at least one end of the battery module (2) along the first direction, and the end plate (3) is located between the battery module (2) and the end beam (4); The end beam (4) includes a body part (42), and the body part (42) extends along a second direction to form a heightening part (41) on the side near the end plate (3), wherein the second direction is perpendicular to the plane of the bottom plate (7); The height of the heightening part (41) away from the base plate (7) along the second direction is H, and the height of the end plate (3) away from the base plate (7) along the second direction is D, satisfying: H≥2 / 3D.

2. The battery pack according to claim 1, characterized in that, The end beam (4) further includes a support (43), one side of which is connected to the main body (42) and the other side is connected to the heightening part (41). The support (43) is adapted to provide support for the heightening part (41).

3. The battery pack according to claim 2, characterized in that, The support portion (43) includes an extension wall (431) and a support wall (432). The extension wall (431) is formed by extending along a second direction from the side of the body portion (42) away from the end plate (3). The support wall (432) is connected between the extension wall (431) and the heightening portion (41).

4. The battery pack according to claim 2, characterized in that, The length of the support part (43) along the third direction is L1, and the length of the end beam (4) along the third direction is L2, satisfying: 0.5≤L1 / L2≤0.8, wherein the third direction is parallel to the plane where the bottom plate (7) is located and perpendicular to the first direction.

5. The battery pack according to claim 4, characterized in that, The end beam (4) forms a clearance area along the third direction in the area where the support part (43) is not provided; The battery pack also includes a fixing member (6), which is disposed in the avoidance area and is used to fix the end side beam (4) to the base plate (7).

6. The battery pack according to claim 5, characterized in that, The main body (42) forms a mounting wall (421) on the side opposite to the base plate (7), and the mounting wall (421) is provided with mounting holes, through which the fastener (6) passes.

7. The battery pack according to claim 5, characterized in that, The avoidance area is formed at least at both ends of the end beam (4) along the third direction.

8. The battery pack according to any one of claims 1 to 7, characterized in that, Along the first direction, the thickness of the heightening portion (41) is less than the thickness of the end side beam (4).

9. The battery pack according to claim 8, characterized in that, The heightening section (41) has a thin-walled structure.

10. The battery pack according to claim 2, characterized in that, The battery pack also includes a connector (5) adapted to be installed on the support (43).

11. The battery pack according to claim 2, characterized in that, The end beam (4) is an integrally formed structure.

12. The battery pack according to any one of claims 1 to 7, characterized in that, The box body includes two sub-boxes distributed along the second direction, the bottom plate (7) is disposed between the two sub-boxes, and the end side beam (4) is located in the upper sub-box.

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