Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a box body and a battery pack, the box body comprises a box body and a beam body, a containing cavity is formed in the box body, and the beam body is arranged in the containing cavity; the battery pack is arranged in the accommodating cavity, the battery pack comprises at least two batteries, poles with the same polarity in the two batteries are electrically connected through a conductive piece, one battery is arranged on one side of the beam body, and the other battery is arranged on the other opposite side of the beam body; in the height direction of the box body, the minimum thickness of the conductive part is H1, the minimum distance between two poles, connected through the conductive part, of the two batteries is L1, and L1 / H1 is larger than or equal to 20 and smaller than or equal to 50. According to the utility model, by limiting the ratio relation between the thickness of the conductive piece and the distance between the two poles, the resistance of the conductive piece can be reduced, and the fault risk caused by larger voltage difference between the parallel batteries is reduced, so that the service life of the battery pack is prolonged.

Description

Technical Field

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

[0002] In traditional battery packs, to improve space utilization and structural strength, beams can be installed on the casing to divide it into two cavities for housing batteries. Each cavity contains multiple batteries arranged in sequence, forming a battery pack. Adjacent batteries are electrically connected via conductive components. Conductive components are also required to electrically connect the batteries separated by the beams; in this case, the conductive components need to cross the beams and connect the batteries on both sides of the beams.

[0003] The drawback of this structure is that when adjacent batteries are connected in parallel, if the cross-beam connection is achieved through conductive components, the length of the conductive components may be too long and the resistance may be too high. This can lead to a voltage difference between the parallel batteries and other parallel batteries, which can easily cause faults such as circulating current, overcharging, and over-discharging, ultimately resulting in a shorter battery pack lifespan. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem that when adjacent parallel batteries in the battery pack are connected across a beam by conductive components, the conductive components are too long and have too high resistance, resulting in large voltage differences between the batteries, which easily leads to failure and a short battery pack life.

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

[0006] The box includes a box body and a beam, wherein the box body has a receiving cavity and the beam is placed in the receiving cavity;

[0007] A battery pack is disposed within the receiving cavity. The battery pack includes at least two batteries. The terminals of the two batteries with the same polarity are electrically connected through a conductive element. One of the batteries is disposed on one side of the beam, and the other battery is disposed on the opposite side of the beam.

[0008] In the height direction of the housing, the minimum thickness of the conductive element is H1, and the minimum distance between the two terminals of the two batteries connected by the conductive element is L1, satisfying 20≤L1 / H1≤50.

[0009] Beneficial Effects: The battery pack of this utility model incorporates beams within the casing, enhancing the structural strength of the casing. By separating the parallel batteries and placing them on opposite sides of the beams, the space within the housing is fully utilized, improving the battery pack's space utilization rate. By limiting the product L1 / H1 of the minimum thickness of the conductive components and the minimum distance between the two poles across the beam to a suitable range, the excessive length and resistance of the conductive components caused by excessive pole spacing between the parallel batteries on both sides of the beam can be reduced. This reduces the voltage difference between the batteries on both sides of the beam and other parallel batteries, lowering the risk of circulating current, overcharging, and over-discharging in the battery pack, and ultimately extending its lifespan. Attached Figure Description

[0010] 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.

[0011] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0012] Figure 2 This is a top view of a battery pack according to an embodiment of the present utility model;

[0013] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0014] Figure 4 for Figure 2 A magnified view of part B in the diagram;

[0015] Figure 5 This is a schematic diagram of the structure of a conductive component in a battery pack according to an embodiment of the present utility model;

[0016] Figure 6 This is a cross-sectional view of a conductive component of a battery pack according to an embodiment of the present utility model.

[0017] Figure 7 This is a partial cross-sectional view of another conductive element of a battery pack according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Box body; 101. Box body; 102. Beam; 103. Receiving cavity; 104. Lifting hole; 2. Battery pack; 201. Battery; 2011. Terminal; 3. Conductive component; 301. Clearance part; 4. Insulation layer; 5. Buffer part; 6. Welding mark. Detailed Implementation

[0020] 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.

[0021] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0022] According to embodiments of the present invention, such as Figure 1 As shown, a battery pack is provided, including: a housing 1 and a battery pack 2. The housing 1 includes a housing body 101 and a beam 102. The housing body 101 has a receiving cavity 103, and the beam 102 is placed in the receiving cavity 103. The battery pack 2 is disposed in the receiving cavity 103. The battery pack 2 includes at least two batteries 201. The terminals 2011 of the two batteries 201 with the same polarity are electrically connected by a conductive element 3. One battery 201 is located on one side of the beam 102, and the other battery 201 is located on the opposite side of the beam 102. In the height direction of the housing 1, the minimum thickness of the conductive element 3 is H1, and the minimum distance between the two terminals 2011 of the two batteries 201 connected by the conductive element 3 is L1, satisfying 20≤L1 / H1≤50.

[0023] Therefore, the battery pack provided in this embodiment of the present invention, with the beam 102 set inside the housing 1, can improve the structural strength of the housing 1. By splitting the parallel batteries 201 onto opposite sides of the beam 102, the space within the receiving cavity 103 can be fully utilized, avoiding redundancy in the receiving cavity 103 that might result from placing the parallel batteries 201 on the same side of the beam 102, thus improving the space utilization rate of the battery pack. By limiting the product L1 / H1 of the minimum thickness of the conductive element 3 and the minimum distance between the two pole posts 2011 across the beam to a suitable range, the excessive length of the conductive element 3 caused by the excessive spacing between the pole posts 2011 on both sides of the beam 102 can be reduced. This reduces the increase in resistance, which would affect the voltage of the parallel batteries 201, thereby reducing the voltage difference between adjacent parallel batteries 201 on both sides of the beam 102 and other parallel batteries 201, reducing the risk of circulating current, overcharging, and over-discharging in the battery pack, and thus improving the service life of the battery pack.

[0024] Within the aforementioned range, L1 / H1 can reduce the resistance increase caused by the conductive component 3 between the two batteries 201, and at the same time avoid the risk of the conductive component 3 colliding with the housing 1, leading to insulation failure. If L1 / H1 is too small, the conductive component 3 is prone to short-circuiting with the housing 1, causing the risk of insulation failure. If L1 / H1 is too large, the resistance between the two batteries 201 will be too large, affecting the energy utilization of the entire battery pack.

[0025] For example, in this embodiment of the invention, the value of L1 / H1 can be 20, 30, 40, 50, etc.

[0026] Specifically, during assembly, the battery 201 has its electrode assembly located at the top, and the conductive component 3 is located at the top of the battery 201 and spans across the beam 102. The thickness of the conductive component 3 can vary in different parts, such as... Figure 6 As shown, the conductive component 3 has an overall "U"-shaped structure, providing good support performance. The portion of the conductive component 3 connected to the terminal 2011 has a minimum thickness H1. The minimum distance L1 between the two terminals 2011 connected by the conductive component 3 of the two batteries 201 is as follows: Figure 3 As shown.

[0027] Specifically, the beam 102 divides the receiving cavity 103 into two sub-cavities, each of which can contain multiple batteries 201 arranged in sequence. Adjacent batteries 201 within each sub-cavity can be connected in parallel or in series-parallel connections via conductive elements 3. The terminals 2011 with the same polarity in two adjacent batteries 201 located on opposite sides of the beam 102 are electrically connected via conductive elements 3, thus achieving a parallel connection between the two batteries 201.

[0028] In addition, the battery pack also includes a cover, which is placed on top of the battery pack body 101 after the battery 201 is assembled into the body 101.

[0029] It should be noted that the material of the conductive component 3 is not limited in this embodiment of the utility model. As long as the conductive component 3 can realize the electrical connection between the two poles 2011, the conductive component 3 can be made of metal materials such as aluminum plate or copper plate.

[0030] It should be noted that this utility model embodiment does not restrict the connection method between the box body 101 and the beam 102. Any existing connection method can be selected as needed. For example, the box body 101 and the beam 102 can be welded together for a firm connection, or the box body 101 and the beam 102 can be fixedly connected by fasteners for easy installation. Fasteners can be screws, bolts, etc.

[0031] In one embodiment, H1 ranges from 1.5mm ≤ H1 ≤ 5mm. The thickness of the conductive element 3 directly affects its resistance. By limiting the minimum thickness H1 of the conductive element 3 to a suitable range, the resistance of the conductive element 3 can be reduced, heat dissipation can be decreased, and material waste can be avoided. If H1 is too large, the distance between the conductive element 3 and the beam 102 will be too small, making them prone to interference and affecting insulation performance. It will also increase the total height of the beam 102 and the conductive element 3, affecting the energy density of the battery pack. If H1 is too small, the resistance of the conductive element 3 will be too large, thereby increasing the voltage difference between the batteries 201 on both sides of the beam 102 and other batteries 201, which can easily lead to failure and reduce the service life of the battery pack. Moreover, the conductive element 3 will generate severe heat due to excessive resistance, which may also lead to the risk of thermal runaway.

[0032] And / or, the range of L1 is 40mm ≤ L1 ≤ 200mm. By limiting the minimum distance L1 between the two terminals 2011 connected by the conductive element 3 to a suitable range, the resistance can be reduced and the insulation performance improved. If L1 is too large, the conductive element 3 will be too long, the resistance will increase, thereby widening the voltage difference between the batteries 201 on both sides of the beam 102 and other batteries 201, which may easily lead to failure and reduce the service life of the battery pack. If L1 is too small, the arrangement of the batteries 201 will be too dense, which may easily cause short circuit risk and poor heat dissipation.

[0033] For example, in this embodiment of the present invention, H1 is 2mm and L1 is 40mm, then L1 / H1 is 20; or, H1 is 3mm and L1 is 90mm, then L1 / H1 is 30; or, H1 is 4mm and L1 is 160mm, then L1 / H1 is 40, and so on.

[0034] In one embodiment, an insulating layer 4 is provided between the conductive element 3 and the beam 102, and the range of L1 / H1 is 20 ≤ L1 / H1 ≤ 40. By providing an insulating layer 4 between the conductive element 3 and the beam 102, the insulation performance between the conductive element 3 and the beam 102 can be improved. In addition, providing an insulating layer 4 is equivalent to increasing the value of H1, which can reduce the impact of the resistance of the conductive element 3 on the battery pack, thus reducing the upper limit of L1 / H1.

[0035] For example, in this embodiment of the invention, the value of L1 / H1 can be 20, 30, 40, etc.

[0036] In one embodiment, such as Figure 7As shown, the thickness of the insulating layer 4 is H2, and the range of H2 is 0.05mm ≤ H2 ≤ 3mm. By limiting the thickness H2 of the insulating layer 4 to a certain range, good insulation between the conductive component 3 and the beam 102 can be ensured, while also facilitating heat dissipation of the conductive component 3. If the value of H2 is too small, it will be difficult to guarantee the insulation between the conductive component 3 and the beam 102; if the value of H2 is too large, it will reduce the heat dissipation capacity of the conductive component 3.

[0037] For example, in this embodiment of the present invention, the value of H2 can be 0.05mm, 1mm, 2mm, 3mm, etc.

[0038] In one embodiment, the insulating layer 4 is disposed on the side of the conductive element 3 facing the beam 102. Disposing the insulating layer 4 on the side of the conductive element 3 facing the beam 102 facilitates the installation and use of the battery pack.

[0039] In one embodiment, the insulating layer 4 is disposed on the side of the beam 102 facing the conductive element 3. Disposing the insulating layer 4 on the side of the beam 102 facing the conductive element 3 can prevent the insulating layer 4 from affecting the heat dissipation of the conductive element 3.

[0040] It should be noted that this embodiment of the invention does not limit the form or material of the insulating layer 4, and any existing structure can be selected as needed. For example, the insulating layer 4 can be made of foam and attached to the side of the conductive component 3 facing the beam 102, or attached to the side of the beam 102 facing the conductive component 3. The foam can also provide support. In addition, the insulating layer 4 can also be made of any insulating material selected from polyethylene terephthalate, polyimide, and acrylic acid as needed.

[0041] In one embodiment, such as Figure 5 and Figure 6 As shown, the conductive component 3 is provided with a buffer portion 5, and the range of L1 / H1 is 20≤L1 / H1≤35. By providing the buffer portion 5 on the conductive component 3, the risk of the conductive component 3 cracking due to the expansion or vibration of the battery pack during use can be reduced. However, this indirectly increases the length of the conductive component 3, so the value of H1 needs to be increased, which means reducing the upper limit of L1 / H1.

[0042] For example, in this embodiment of the present invention, the value of L1 / H1 can be 20, 25, 30, 35, etc.

[0043] Furthermore, the buffer portion 5 and the insulating layer 4 are integrally formed. For example, the insulating layer 4 can be insulating tape, which covers at least the area of ​​the conductive member 3 covering the beam 102. The insulating tape covering the conductive member 3 can form a buffer structure, so the insulating tape also serves as the buffer portion 5.

[0044] In one embodiment, such as Figure 3 , Figure 4 and Figure 6 As shown, the two opposite ends of the conductive component 3 are welded to the two terminals 2011 respectively. Along the arrangement direction of the two batteries 201, the length of the solder joint 6 between the terminal 2011 of one battery 201 and the conductive component 3 is L2, and the length of the conductive component 3 is L3, satisfying 5mm≤L2≤20mm, 50mm≤L3≤200mm, 0.05≤L2 / L3≤0.2, and 30≤L1 / H1≤50. The larger the length of the solder joint 6, the smaller the resistance of the welding area between the terminal 2011 and the conductive component 3, thus reducing the value of H1, that is, increasing the upper limit of L1 / H1, to ensure insulation performance.

[0045] Specifically, such as Figure 2 As shown, multiple batteries 201 are arranged along the length of the battery pack. The length of the battery pack is as follows: Figure 2 As indicated by arrow L. Multiple rows of batteries 201 are located along the width of the battery pack, as shown in the diagram. Figure 2 As indicated by the arrow W in the diagram.

[0046] For example, in this embodiment of the present invention, L2 is 5mm, L3 is 100mm, L2 / L3 is 0.05, and L1 / H1 is 30; or, L2 is 20mm, L3 is 200mm, L2 / L3 is 0.1, and L1 / H1 is 40; or, L2 is 10mm, L3 is 50mm, L2 / L3 is 0.2, and L1 / H1 is 50.

[0047] In one embodiment, such as Figure 1 and Figure 4 As shown, the beam 102 is provided with a lifting hole 104, which is located between the terminals 2011 of two adjacent batteries 201. The conductive component 3 is provided with a clearance part 301 to avoid the lifting hole 104, and the range of L1 / H1 is 20≤L1 / H1≤30. Specifically, as shown... Figure 4 As shown, the clearance portion 301 is a clearance groove. The lifting hole 104 is used to connect the lifting device for transporting the battery pack. By placing the lifting hole 104 on the beam 102, the mechanical properties of the beam 102 can be utilized to distribute lifting stress and improve the safety of the lifting process. Providing the clearance portion 301 on the conductive component 3 is equivalent to increasing the length of the conductive component 3; therefore, the value of H1 needs to be increased, i.e., the upper limit of L1 / H1 needs to be decreased.

[0048] For example, in this embodiment of the invention, the value of L1 / H1 can be 20, 25, 30, etc.

[0049] Of course, in some other embodiments, the lifting hole 104 may also be located in an area of ​​the beam 102 that is not covered by the conductive element 3, so as to avoid the lifting hole 104 affecting the resistance of the conductive element 3.

[0050] In one embodiment, the conductive element 3 is positioned above the beam 102 with a gap between it and the beam 102. The opposite ends of the conductive element 3 are respectively connected to the terminals 2011 of the same polarity in the two batteries 201. Positioning the conductive element 3 above the beam 102 with a gap forms a cross-beam structure, preventing the conductive element 3 from affecting the structure of the beam 102. Connecting the opposite ends of the conductive element 3 to the terminals 2011 of the same polarity in the two batteries 201 achieves parallel connection of the batteries 201 on both sides of the beam 102.

[0051] For example, such as Figure 3 and Figure 4 As shown, the two ends of the conductive element 3 are respectively connected to the positive terminals of the two batteries 201 on both sides of the beam 102.

[0052] Of course, in some other embodiments, the two ends of the conductive element 3 can also be connected to the negative terminals of the two batteries 201 on both sides of the beam 102.

[0053] To achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery management system and a heat dissipation system. It should be noted that any suitable existing structure can be selected from the other necessary modules or components included in the battery pack. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be repeated here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that the scope of this utility model is not limited thereto.

[0054] 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 box body (1) includes a box body (101) and a beam (102). The box body (101) is provided with a receiving cavity (103), and the beam (102) is placed in the receiving cavity (103). A battery pack (2) is disposed in the receiving cavity (103). The battery pack (2) includes at least two batteries (201). The terminals (2011) with the same polarity in the two batteries (201) are electrically connected by a conductive element (3). One of the batteries (201) is disposed on one side of the beam (102), and the other battery (201) is disposed on the opposite side of the beam (102). In the height direction of the housing (1), the minimum thickness of the conductive element (3) is H1, and the minimum distance between the two poles (2011) of the two batteries (201) connected by the conductive element (3) is L1, satisfying 20≤L1 / H1≤50.

2. The battery pack according to claim 1, characterized in that, The range of H1 is 1.5mm ≤ H1 ≤ 5mm; And / or, the range of L1 is 40mm≤L1≤200mm.

3. The battery pack according to claim 2, characterized in that, An insulating layer (4) is provided between the conductive component (3) and the beam (102), and the range of L1 / H1 is 20≤L1 / H1≤40.

4. The battery pack according to claim 3, characterized in that, The thickness of the insulating layer (4) is H2, and the range of H2 is 0.05mm≤H2≤3mm.

5. The battery pack according to claim 3, characterized in that, The insulating layer (4) is disposed on the side of the conductive element (3) facing the beam (102).

6. The battery pack according to claim 3, characterized in that, The insulating layer (4) is disposed on the side of the beam (102) facing the conductive element (3).

7. The battery pack according to any one of claims 1 to 6, characterized in that, The conductive component (3) is provided with a buffer part (5), and the range of L1 / H1 is 20≤L1 / H1≤35.

8. The battery pack according to any one of claims 1 to 6, characterized in that, Along the arrangement direction of the two batteries (201), the length of the terminal (2011) of one battery (201) and the solder mark (6) of the conductive element (3) is L2, and the length of the conductive element (3) is L3, satisfying 0.05≤L2 / L3≤0.2, 30≤L1 / H1≤50.

9. The battery pack according to any one of claims 1 to 6, characterized in that, The beam (102) is provided with a lifting hole (104), which is located between the poles (2011) of two adjacent batteries (201). The conductive component (3) is provided with a clearance part (301) to avoid the lifting hole (104), and the range of L1 / H1 is 20≤L1 / H1≤30.

10. The battery pack according to any one of claims 1 to 6, characterized in that, The conductive element (3) is located above the beam (102) and has a gap with the beam (102). The two ends of the conductive element (3) are respectively connected to the poles (2011) of the same polarity in the two batteries (201).

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