Battery pack

Abstract

The utility model belongs to the technical field of battery packs, and particularly discloses a battery pack which comprises a first shell, a second shell and a light guide assembly, the first shell and the second shell are connected in a glue sealing mode to form a containing cavity, and the battery and the circuit board are both arranged in the containing cavity. The light guide assembly comprises at least one first light guide piece, one end of the first light guide piece covers the display assembly, the other end of the first light guide piece extends into a first receding hole in the second shell, and meanwhile a gas flow channel capable of communicating the containing cavity with the outside is formed in the first light guide piece. When the battery pack is assembled, glue at the contact part of the two shells is not solidified, and gas between the two shells can escape from the gas flow channel of the first light guide part for exhausting and pressure relief, so that the situation that a large amount of gas escapes from the glue between the two shells, so that gaps or bubbles are formed in a sealing ring formed by the glue, the waterproof performance of the sealing ring is reduced and the service life of the sealing ring is prolonged is avoided. And after assembly is completed, the gas flow channel is sealed by glue pouring, so that the overall waterproof performance of the battery pack can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack. Background Art

[0002] A battery pack generally refers to a product in which multiple batteries are connected in series and parallel, and packaged, encapsulated and assembled according to specific needs. As an energy supply device, the battery pack is widely used in many fields such as electric vehicles, mobile communications, and energy storage systems. Some battery packs used outdoors have waterproof requirements. During the production process of such battery packs, glue is often used to tightly combine with the upper and lower plastic shells of the battery pack to form an effective sealing ring to ensure the waterproof effect.

[0003] At the same time, in order to improve the sealing reliability, the upper plastic shell and the lower plastic shell in the production process already have good sealing performance before assembly. However, this will cause the gas between the upper plastic shell and the lower plastic shell during the assembly process to escape from the area coated with glue, and the glue during assembly is not completely cured. When the air escapes, it may cause gaps or bubbles in the glue in the sealing area. These gaps or bubbles will damage the integrity of the sealing ring, thereby reducing its waterproof performance. At the same time, when meeting the requirements of mass production, the assembly process is rapid, the air escapes faster, and the impact on the integrity of the sealing ring is greater, reducing the waterproof performance of the battery pack. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery pack, which can ensure that there is a channel for the gas between the shells during the assembly process, and avoid the gas escaping from the colloid between all the shells and damaging its sealing performance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A battery pack, including a battery and a circuit board electrically connected to the battery, wherein a display component is arranged on the circuit board, and is characterized by further comprising:

[0007] A first shell;

[0008] A second shell, the second shell is covered on the first shell, the first shell and the second shell are adhesively sealed and enclosed to form a receiving cavity, the battery and the circuit board are both arranged in the receiving cavity, and the second shell is provided with a first avoidance hole in a penetrating manner;

[0009] The light guide assembly is disposed in the accommodation cavity. The light guide assembly can conduct the optical signal generated by the display assembly to the outside of the accommodation cavity through the first avoidance hole. The light guide assembly includes at least one first light guide member. One end of the first light guide member covers the display assembly, and the other end extends into the first avoidance hole. A gas flow channel that can communicate the accommodation cavity with the outside is provided in the first light guide member.

[0010] Preferably, a groove is provided at one end of the first light guide member close to the first avoidance hole. The gas flow channel includes an air outlet hole, and the air outlet hole is provided in the groove.

[0011] Preferably, in the direction from the bottom of the groove to the notch of the groove, the cross-sectional area of the groove gradually increases.

[0012] Preferably, the cross-section of the notch of the groove is rectangular.

[0013] Preferably, the inner wall of the groove includes a side wall composed of four arc surfaces and a rectangular bottom of the groove.

[0014] Preferably, a seal is provided between the first housing and the second housing. The seal is fixed on the first housing and the edge of the seal is hermetically connected to the second housing. The seal divides the accommodation cavity into a first accommodation space and a second accommodation space. The battery, the circuit board and the display assembly are all disposed in the second accommodation space. The light guide assembly penetrates through the seal and covers the display assembly. The circumference of the light guide assembly is hermetically connected to the seal. The gas flow channel penetrates through the light guide assembly and communicates the second accommodation space with the outside.

[0015] Preferably, one end of the first light guide member close to the display assembly is spaced from the display assembly, and gas can enter the gas flow channel through one end of the first light guide member close to the display assembly.

[0016] Preferably, the light guide assembly further includes at least one second light guide member. A second avoidance hole is provided through the second housing. One end of the second light guide member covers the display assembly, and the other end extends into the second avoidance hole.

[0017] Preferably, a convex structure is provided at one end of the second light guide member extending out of the accommodation cavity.

[0018] Preferably, one ends of the first light guide member and the second light guide member extending out of the accommodation cavity are both concave with respect to the surface of the second housing.

[0019] Beneficial effects:

[0020] The battery pack provided by the present utility model includes a first housing, a second housing, and a light guide assembly. The second housing is covered on the first housing, and the two are adhesively sealed to form a receiving cavity. At the same time, a first avoidance hole is penetratingly provided on the second housing. The light guide assembly includes at least one first light guide member. One end of the first light guide member covers the display assembly, and the other end extends into the first avoidance hole on the second housing. At the same time, a gas flow channel communicating the receiving cavity with the outside is provided in the first light guide member. When the second housing is covered on the first housing and the glue at the contact between the two has not solidified, the gas between the two can escape through the gas flow channel of the first light guide member for exhaust pressure relief, avoiding a large amount of gas from escaping from the glue between the two housings, thereby causing gaps or bubbles to form in the sealing ring formed by the glue and reducing the waterproof performance of the sealing ring. After assembly, the gas flow channel can be filled with glue and sealed to ensure the overall waterproof performance of the battery pack. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the battery pack provided by the present utility model;

[0022] Figure 2 is a cross-sectional schematic diagram of the battery pack provided by the present utility model when the second housing is not assembled;

[0023] Figure 3 is a schematic diagram of the seal of the battery pack provided by the present utility model;

[0024] Figure 4 is a cross-sectional schematic diagram of the battery pack provided by the present utility model after the second housing is assembled;

[0025] Figure 5 is a cross-sectional schematic diagram of the other side of the battery pack provided by the present utility model after assembly.

[0026] In the figure:

[0027] 11 - First housing;

[0028] 12 - Second housing; 121 - First avoidance hole; 122 - Second avoidance hole;

[0029] 131 - First light guide member; 1311 - Air outlet hole; 1312 - Groove; 132 - Second light guide member;

[0030] 14 - First accommodation space; 15 - Second accommodation space;

[0031] 2 - Battery;

[0032] 3 - Circuit board; 31 - Display assembly;

[0033] 4 - Seal. Detailed Embodiment

[0034] The following further describes the present utility model in detail with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] Such as Figures 1 - 5As shown in the figure, this embodiment provides a battery pack, which includes a battery 2 and a circuit board 3 connected to the battery 2. A display component 31 is provided on the circuit board 3. Specifically, the display component 31 can display information such as the remaining power of the battery or the temperature near the battery 2 in digital form. The battery pack has a first housing 11 and a second housing 12. The second housing 12 is covered on the first housing 11, and the first housing 11 and the second housing 12 are adhesively sealed and connected, and a waterproof sealing ring is formed at the adhesive sealing joint. The area enclosed by the first housing 11 and the second housing 12 is the accommodation cavity, and both the battery 2 and the circuit board 3 are arranged in the accommodation cavity. And a first avoidance hole 121 is penetratedly provided on the second housing 12. A light guide component is arranged in the accommodation cavity. The light guide component is arranged in the accommodation cavity and corresponds to the display component 31, so as to conduct the optical signal generated by the display component 31 to the outside of the accommodation cavity through the first avoidance hole 121, facilitating the user to see the information generated by the display component 31 through the light guide component. The light guide component includes at least one first light guide member 131. One end of the first light guide member 131 covers the display component 31, and the other end extends into the first avoidance hole 121. At the same time, a gas flow channel communicating the accommodation cavity with the outside is provided in the first light guide member 131. Therefore, when assembling the battery pack, the gas between the upper and lower plastic housings has an escape path through the gas flow channel in the first light guide member 131, which can relieve pressure and exhaust gas from the accommodation cavity, avoiding impact on the glue at the adhesive sealing joint of the upper and lower plastic housings that has not completely solidified and affecting the sealing and waterproof effect of the battery pack.

[0039] Further, a groove 1312 is provided at one end of the first light guide member 131 away from the first avoidance hole 121, and the air outlet hole 1311 is provided in the groove 1312. Specifically, the air outlet hole 1311 is provided at the bottom of the groove 1312. After the first light guide member 131 exhausts and relieves pressure, a transparent colloid is injected into the groove 1312. The air outlet hole 1311 is provided at the bottom of the groove 1312. Before the colloid solidifies, it is convenient to converge to the bottom of the groove under the action of gravity and then block the air outlet hole 1311. At the same time, when injecting the colloid when one end of the first light guide member 131 is set to be flat, the colloid is likely to flow out of this plane and adhere to other parts. Specifically, the gas flow path includes an air inlet end communicating with the accommodation cavity and an air outlet hole 1311 communicating with the outside. Further, there is only one first light guide member 131. The air inlet end is provided at one end of the first light guide member 131 close to the display component 31, and the air outlet hole 1311 is provided at one end of the first light guide member 131 away from the display component 31. The peripheral wall of the first light guide member 131 abuts against the inner wall of the first avoidance hole 121. During the assembly process of the battery pack, a part of the air between the upper and lower plastic shells remains in the accommodation cavity, and the other part of the air can flow into the gas flow path from the air inlet end under the action of air pressure, and then flow out from the air outlet hole 1311. That is, this part of the air flows into the gas flow path through the air inlet end of the first light guide member 131 and then escapes from the accommodation cavity through the air outlet hole 1311, and then can escape to the outside through the first avoidance hole 121. Therefore, the design of the first light guide member 131 enables the redundant air not to escape through the not yet fully solidified sealing ring during the assembly of the battery pack, damaging the sealing performance of the sealing ring. After the first light guide member 131 exhausts and relieves pressure, a transparent colloid is used to encapsulate the first light guide member 131. After the encapsulation is completed, while ensuring that the light guide component and other electrical structures in the accommodation cavity are isolated from the outside, it can also ensure that there are no additional air holes on the appearance surface of the battery pack, and the aesthetic degree is high.

[0040] Further, in the direction from the bottom of the groove 1312 to the groove opening, the cross-sectional area of the groove 1312 gradually increases. Since the colloid is a liquid before solidification, the surface tension of the liquid tends to minimize the surface area of the liquid, that is, it tends to form a spherical surface. Compared with injecting the glue into a flat surface or a groove 1312 with the same cross-sectional area, when injecting the glue into a groove with a gradually increasing cross-sectional area in the direction from the bottom to the groove opening, the glue is more likely to gather and form an obvious convex surface. After solidification, the convex colloid can form a convex lens, and this convex lens can converge the optical signal transmitted in the first light guide member 131, avoiding the dispersion of light. When observing information such as the remaining power and temperature of the battery pack by the user of the battery pack, a clearer optical signal can be observed through this convex surface. Specifically, the injected colloid can be a transparent colloid such as transparent silica gel or UV glue (ultraviolet curable glue).

[0041] Further, the notch of the groove 1312 is rectangular. Specifically, the first light guide member 131 is a cuboid light guide column. One end of the cuboid light guide column in the length direction is fixed to the first housing 11, and the other end is provided with a groove 1312. The notch of the groove 1312 is rectangular, and the area of the notch is slightly smaller than the cross-sectional area of the first light guide member 131 at the end away from the first housing 11. The structure of the cuboid light guide column facilitates the conduction of light in a straight line inside it. The rectangular shape of the notch helps to control the appearance surface after the glue is formed. After the glue solidifies and forms, a convex structure with a rectangular bottom can be formed, maximizing the display area of the light guide column. At the same time, the rectangular display shape can more intuitively display digital information.

[0042] Further, the inner wall of the groove 1312 includes a side wall composed of four arc surfaces and a rectangular groove bottom. After the exhaust is completed, a transparent colloid is injected into the groove 1312. Because the smooth arc surface has a smooth curvature, and the concave arc surface restricts the liquid flow more evenly, it is not easy to cause local excessive accumulation or flow of the liquid, facilitating the uniform distribution of the glue in it. It also fits well with the spherical surface that the liquid surface tension tends to form, helping the glue to form an obvious convex after solidification and playing a role in converging light.

[0043] Specifically, as Figure 2 and Figure 5 shown, in this embodiment, a seal 4 is provided between the first housing 11 and the second housing 12. The seal 4 is fixed to the first housing 11 and the edge of the seal 4 is sealingly connected to the second housing 12. The seal 4 divides the accommodation cavity into a first accommodation space 14 and a second accommodation space 15. The first accommodation space 14 is enclosed by the seal 4 and a part of the second housing 12. The second accommodation space 15 is enclosed by the seal 4, the first housing 11 and another part of the second housing 12. The battery 2, the circuit board 3 and the display component 31 are all arranged in the second accommodation space 15. The light guide assembly penetrates through the seal 4 and covers the display component 31, and the circumference of the light guide assembly is sealingly connected to the seal 4. The gas flow channel penetrates through the light guide assembly and communicates the second accommodation space 15 with the outside. That is, the circuit-related components are all located in the second accommodation space 15, and the sealing ring is located in the circumference of the second accommodation space 15. The second accommodation space 15 after the battery pack is assembled and encapsulated has good waterproof performance. The gas discharged from the gas flow channel in the first light guide member 131 is actually the gas that cannot be accommodated in the second accommodation space 15 during assembly, relieving pressure and exhausting gas from the second accommodation space 15 to prevent a large amount of gas from escaping from the unsealed sealing ring.

[0044] Further, one end of the first light guide member 131 close to the display component 31 is spaced from the display component 31, and gas can enter the gas flow channel through one end of the first light guide member 131 close to the display component 31. Specifically, the spacing between one end of the first light guide member 131 close to the display component 31 and the display component 31 prevents the intake end of the gas flow channel from being blocked by the display component 31, ensuring that the gas in the second accommodation space 15 can enter the gas flow channel and escape to the outside along the gas flow channel. The first light guide member is a transparent solid columnar structure, and the gas flow channel can be arranged as a circular through hole penetrating the first light guide member 131 along the length direction. In some other embodiments, the gas flow channel can also be arranged as a stepped hole, which is divided into a first hole close to the first housing 11 and a second hole far from the first housing 11, and the aperture of the first hole is larger than that of the second hole. In some other embodiments, the first light guide member 131 can be in contact with the circuit board 3 and surround the display component 31, and at this time, the intake end of the gas flow channel is arranged on the side wall of the first light guide member 131 in the second accommodation space 15. At the same time, according to the specific requirements for the exhaust and pressure relief capabilities of the gas flow channel, the shape and size of the gas flow channel can be changed according to the actual situation, which will not be limited here.

[0045] Specifically, as Figure 2 、 Figure 3 and Figure 4 shown, the light guide assembly further includes a second light guide member 132, and the second light guide member 132 is not provided with a gas flow channel, that is, the second light guide member 132 only plays a role in guiding light. A second avoidance hole 122 is penetratively provided on the second housing 12. One end of the second light guide member 132 covers the display component 31, and the other end extends into the second avoidance hole 122. Only by the cooperation of the second light guide member 132 and the first light guide member 131 after encapsulation can the battery pack data information be completely displayed. Further, the first light guide member 131 is processed from the second light guide member 132, and only setting one first light guide member 131 can reduce the overall production cost of the battery pack.

[0046] Further, a convex structure is provided at one end of the second light guide member 132 extending out of the accommodation cavity. The convex on the second light guide member 132 has the same function as the colloid after injection molding of the first light guide member 131, both of which are to help converge the light in the light guide member. Further, there are three first light guide members 131 and second light guide members 132 in total, and the three light guide members are arranged at equal intervals along a straight line. Further still, the three light guide members can respectively display three corresponding numbers, and the power display can be accurate to one percent.

[0047] Further, one end of the first light guide member 131 and the second light guide member 132 extending out of the accommodating cavity is concave with respect to the surface of the second housing 12. That is, the light guide assembly is recessedly disposed in the battery pack, and this setting method can reduce the exposure degree of the light guide assembly, avoid the influence of dirt attachment in the external environment on the light transmittance of the light guide assembly. At the same time, since the first light guide member 131 is recessed in the first avoidance hole 121 and the peripheral wall of the first light guide member 131 abuts against the inner wall of the first avoidance hole 121, when encapsulating the first light guide member 131, it is only necessary to insert the glue gun head into the first avoidance hole 121, which is convenient for positioning and operation.

[0048] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery pack, comprising a battery (2) and a circuit board (3) electrically connected to the battery (2), wherein a display component (31) is arranged on the circuit board (3), characterized in that: The battery pack also includes: A first housing (11); a second shell (12), the second shell (12) being covered on the first shell (11), the first shell (11) and the second shell (12) being connected by glue sealing to form a receiving cavity, the battery (2) and the circuit board (3) being both arranged in the receiving cavity, and the second shell (12) being provided with a first avoidance hole (121) extending therethrough; A light guide component is arranged in the accommodating cavity, and the light guide component can transmit the optical signal generated by the display component (31) to the outside of the accommodating cavity through the first avoidance hole (121). The light guide component comprises at least one first light guide member (131), one end of the first light guide member (131) is covered on the display component (31), and the other end extends into the first avoidance hole (121), and a gas flow channel that can connect the accommodating cavity with the outside is arranged in the first light guide member (131).

2. The battery pack according to claim 1, characterized in that: A groove (1312) is provided at one end of the first light guide member (131) close to the first avoidance hole (121); the gas flow channel comprises an air outlet hole (1311); and the air outlet hole (1311) is provided in the groove (1312).

3. The battery pack according to claim 2, characterized in that: From the bottom of the groove (1312) toward the groove opening, the cross-sectional area of ​​the groove (1312) gradually increases.

4. The battery pack according to claim 3, characterized in that: The cross section of the notch of the groove (1312) is rectangular.

5. The battery pack according to claim 4, characterized in that: The inner wall of the groove (1312) comprises a side wall composed of four arc-shaped surfaces and a rectangular groove bottom.

6. The battery pack according to claim 5, characterized in that: A sealing member (4) is arranged between the first shell (11) and the second shell (12); the sealing member (4) is fixed to the first shell (11) and the edge of the sealing member (4) is sealedly connected to the second shell (12); the sealing member (4) divides the accommodating cavity into a first accommodating space (14) and a second accommodating space (15); the battery (2), the circuit board (3) and the display component (31) are all arranged in the second accommodating space (15); the light guide component passes through the sealing member (4) and is covered on the display component (31); the circumference of the light guide component is sealedly connected to the sealing member (4); the gas flow channel passes through the light guide component and connects the second accommodating space (15) with the outside.

7. The battery pack according to claim 6, characterized in that: One end of the first light guide (131) close to the display component (31) is spaced apart from the display component (31), and gas can enter the gas flow channel through the end of the first light guide (131) close to the display component (31).

8. The battery pack according to any one of claims 1 to 7, characterized in that: The light guide assembly further comprises at least one second light guide member (132); a second avoidance hole (122) is provided through the second shell (12); one end of the second light guide member (132) is covered on the display assembly (31), and the other end extends into the second avoidance hole (122).

9. The battery pack according to claim 8, characterized in that: One end of the second light guide member (132) extending out of the accommodating cavity is provided with a protruding structure.

10. The battery pack according to claim 9, characterized in that: One end of the first light guide member (131) and the second light guide member (132) extending out of the accommodating cavity are both recessed into the surface of the second shell (12).

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