Battery pack

Abstract

The utility model discloses a battery pack which comprises a box body, a plastic bracket and a battery cell assembly, and the box body is provided with an accommodating cavity; the plastic support is arranged in the containing cavity and comprises a support body and a plurality of protrusions, the protrusions are arranged on one side of the support body and abut against the bottom face of the box body, a pressure relief cavity is formed between the support body and the bottom face of the box body, a plurality of pressure relief holes are formed in the support body, and the pressure relief holes communicate with the pressure relief cavity; the battery cell assembly comprises a plurality of single batteries fixed in the containing cavity, the single batteries are connected with the side, away from the protrusion, of the support body, the pressure relief holes are blocked, and the battery pack support aims at simplifying an existing battery pack support structure and reducing cost.

Description

Technical Field

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

[0002] With the rapid development of electric vehicles and energy storage systems, the design and manufacture of battery systems are moving towards high efficiency, reliability and low cost. In the traditional battery pack structure, a plastic bracket is usually provided at the bottom of the battery cell to fix and support the battery cell. However, in order to ensure the structural strength between the plastic bracket and the bottom guard plate, columnar foam or other similar support structures are usually provided between the two. The use of such columnar foam or support structure not only increases the amount of material used, but also increases the overall cost. In addition, the additional support structure requires separate assembly and installation steps, which increases the difficulty of assembly and reduces production efficiency. Therefore, under the premise of maintaining the stability of the battery cell, optimizing the bracket structure, reducing costs and simplifying the installation steps are of great practical significance for the battery pack. Utility Model Content

[0003] One purpose of the present invention is to provide a battery pack, which aims to simplify the existing battery pack bracket structure and reduce costs.

[0004] To achieve the above-mentioned purpose, the present invention provides a solution: a battery pack, which includes a box body with a accommodating cavity; a plastic bracket, which is arranged in the accommodating cavity, and the plastic bracket includes a bracket body and multiple protrusions, the multiple protrusions are arranged on one side of the bracket body, the top surfaces of the multiple protrusions are in contact with the bottom surface of the box body, and a pressure relief cavity is formed between the bracket body and the bottom surface of the box body, the bracket body is provided with multiple pressure relief holes, and the pressure relief holes are connected to the pressure relief cavity; a battery cell assembly, including multiple single cells fixed in the accommodating cavity, the single cells are connected to the side of the bracket body away from the protrusions, and the pressure relief holes are blocked.

[0005] Optionally, the cross section of the protrusion is circular, triangular or rectangular.

[0006] Optionally, the area of ​​the top surface of the protrusion gradually increases to the area of ​​the bottom surface of the protrusion.

[0007] Optionally, the distance from the top surface of the protrusion to the end surface of the bracket body close to the protrusion is H, 6mm <H≤12mm。

[0008] Optionally, a groove is provided in an area of ​​the bracket body corresponding to the protrusion, and the distance from the end surface of the groove facing away from the bracket body to the end surface of the protrusion facing away from the bracket body is the same as the thickness of the bracket body.

[0009] Optionally, the bracket body and the protrusion are an integral injection-molded structure.

[0010] Optionally, the bracket body is provided with a plurality of glue injection grooves, which are arranged on the side of the bracket body away from the protrusion, and the glue injection grooves are arranged around the outer periphery of the pressure relief hole. The glue injection grooves are opposite to the single battery cells, and are used to fill the glue to bond with the single battery cells.

[0011] Optionally, the glue injection groove and the groove are connected.

[0012] Optionally, there are multiple plastic brackets, and the edge of the bracket body in the width direction is provided with multiple limiting grooves arranged along its length direction. Adjacent plastic brackets are engaged with each other through the limiting grooves to achieve limitation between the multiple plastic brackets.

[0013] Optionally, an arc transition structure is provided at the connection between adjacent limiting grooves.

[0014] Optionally, the box body further includes a support beam arranged on the bottom surface of the box body, and the bracket body is erected on the support beam.

[0015] Optionally, an anti-slip structure is provided at the connection between the bracket body and the support beam.

[0016] Optionally, the battery pack further comprises mica paper, which is affixed to one side of the bracket body close to the protrusion. The mica paper is provided with clearance holes, which correspond one-to-one to the protrusions, and the protrusions are inserted into the clearance holes.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a protruding structure on the bracket body so that it is directly fixedly connected to the bottom of the box. Specifically, the top surface of the protrusion on the bracket body is connected to the bottom of the box, which provides sufficient supporting strength for the bracket and eliminates the additional supporting structures commonly used in the prior art, such as columnar foam or other supporting parts. Compared with the prior art, traditional bracket installation often requires additional steps to fix the foam or supporting structure, which increases the complexity of the production process and thus affects production efficiency. The present application directly connects the protrusion to the bottom of the box, eliminating the need for additional supporting components, which not only simplifies the overall structure but also significantly reduces production costs. In addition, the protruding structure is not only used to provide support, but also constructs a pressure relief chamber through the space formed between it and the bottom of the box, which is connected to the pressure relief hole on the bracket body to form an effective pressure release channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is an overall schematic diagram of the battery pack provided by an embodiment of the present utility model;

[0021] Figure 2 This is an exploded view of a battery pack provided by an embodiment of the present utility model;

[0022] Figure 3 The embodiment of the present utility model provides Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0023] Figure 4 The embodiment of the present utility model provides Figure 3 A partial enlarged schematic diagram of area A in the middle;

[0024] Figure 5 The embodiment of the present utility model provides Figure 3 A partial enlarged schematic diagram of area B in the middle;

[0025] Figure 6 This is a structural diagram of a plastic bracket provided by an embodiment of the present utility model;

[0026] Figure 7 The embodiment of the present utility model provides Figure 6 Schematic diagram of the cross-sectional structure at the middle BB;

[0027] Figure 8 The embodiment of the present utility model provides Figure 7 A partial enlarged schematic diagram of the middle C area.

[0028] Description of Figure Numbers:

[0029] 20. Box body; 201. Bottom guard plate; 202. Outer frame; 203. Accommodation cavity; 204. Support beam; 205. Anti-slip structure;

[0030] 30. Plastic bracket; 301. Bracket body; 3011. Pressure relief hole; 3012. Groove; 3013. Glue injection groove; 3014. Connecting channel; 3015. Limiting groove; 3016. Arc transition structure; 302. Protrusion; 303. Pressure relief chamber;

[0031] 40. Battery cell assembly; 401. Single battery;

[0032] 50. Mica paper; 501. Give way hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , Figure 1 This is an overall schematic diagram of the battery pack provided by an embodiment of the present utility model; Figure 2 This is an exploded view of a battery pack provided by an embodiment of the present utility model; Figure 3 The embodiment of the present utility model provides Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 4 The embodiment of the present utility model provides Figure 3 A partial enlarged schematic diagram of area A in the middle.

[0035] The embodiment of the present invention provides a battery pack, including a box body 20, a plastic bracket 30 and a battery cell assembly 40. The box body 20 is provided with a receiving cavity 203. The receiving cavity 203 can be a closed structure or a semi-enclosed structure with an opening.

[0036] The plastic bracket 30 is located within the accommodating chamber 203 and includes a bracket body 301 and multiple protrusions 302. The multiple protrusions 302 are distributed along one side of the bracket body 301. The top surfaces of these protrusions 302 are fixedly connected to the bottom of the case 20 by means of snaps or adhesives. These protrusions 302 form a gap between the bracket body 301 and the bottom of the case 20, namely the pressure relief chamber 303, to release internal pressure when the battery is overcharged or experiences thermal runaway. The bracket body 301 is provided with multiple pressure relief holes 3011, which are connected to the pressure relief chamber 303. When the internal pressure increases, gas can be discharged smoothly through the pressure relief holes 3011 and the pressure relief chamber 303.

[0037] The battery cell assembly 40 includes multiple single cells 401, which are secured within the accommodating cavity 203. Specifically, the bottom or side of each single cell 401 is connected to the side of the bracket body 301 facing away from the protrusion 302, ensuring a stable installation between the battery and the bracket body 301. The mounting position of the single cells 401 ensures that they block the pressure relief holes 3011 in the bracket body 301. When pressure is applied to the battery cell assembly 40, the pressure enters the pressure relief cavity 303 through the pressure relief holes 3011 and is ultimately released through the pre-set pressure relief path.

[0038] In this embodiment, the present application provides a protrusion 302 on the bracket body 301, which is directly connected to the bottom of the box body 20, eliminating the need for additional support structures. This differs from the prior art, where bracket installation often requires additional steps to secure the columnar foam or support structure, resulting in low production efficiency. In the present application, the top surface of the protrusion 302 is fixedly connected to the bottom of the box body 20, providing sufficient support strength and ensuring the stability of the battery cell. This not only eliminates the need for columnar foam or similar support structures, reducing production costs, but also simplifies the installation steps of additional components.

[0039] In addition, due to the effect of the protrusion 302 structure, a pressure relief chamber 303 is formed between the bracket body 301 and the bottom of the box body 20. Combined with the multiple pressure relief holes 3011 designed on the bracket body 301, an effective pressure release channel is formed. When gas is generated inside the battery due to overcharging or thermal runaway, the gas can enter the pressure relief chamber 303 through the pressure relief holes 3011 and be discharged through the preset pressure relief path. Compared with the traditional design, the present application directly opens the pressure relief hole 3011 on the bracket to communicate with the pressure relief chamber 303, making the entire battery pack more compact while improving overall safety.

[0040] Furthermore, the cross-section of the protrusion 302 in this application can have a variety of shapes to suit different usage requirements and optimize the structural performance of the battery pack. Specifically, the cross-section of the protrusion 302 can be designed to be circular, triangular, rectangular, or other axisymmetric shapes such as elliptical, regular polygonal, or hexagonal.

[0041] In this embodiment, when a battery pack design requires uniform stress and high strength, the cross-section of protrusion 302 can be designed to be circular. This allows for more uniform stress distribution in the structure and effectively withstands multi-directional pressure and stress. A circular cross-section of protrusion 302 improves overall support strength and is relatively simple to manufacture.

[0042] When a battery pack structure with stronger bending and compressive resistance is required, the cross-section of the protrusion 302 can be designed as a triangle, especially an equilateral triangle. The protrusion 302 can provide good bending stiffness and stability in the structure. The triangular design makes the protrusion 302 have higher compressive resistance.

[0043] The cross-section of the protrusion 302 can also be designed to be rectangular. A rectangular shape can provide more stable support, especially when directional bearing capacity is required. The rectangular protrusion 302 can generally better contact the planar structure of the bottom guard plate 201 and the bracket body 301, thereby improving the firmness of the connection.

[0044] Furthermore, to improve the stability of the battery pack under complex external forces, the protrusion 302 is designed so that its area gradually increases from the top to the bottom, i.e., the top area of ​​the protrusion 302 is smaller than the bottom area of ​​the protrusion 302. The overall shape is an inverted platform, with the smaller side connected to the bottom guard plate 201 and the larger side connected to the bracket body 301.

[0045] In this embodiment, the area of ​​protrusion 302 gradually increases from the top to the bottom, effectively dispersing stress within the battery pack. This structure, particularly when subjected to external impact or vibration, gradually shifts stress concentrated on the top to the bottom, avoiding stress concentration at a single point and reducing the risk of structural deformation or damage. Furthermore, the increased bottom area allows protrusion 302 to provide a wider range of support on the bracket body 301, allowing the support points to function effectively and preventing localized structural instability.

[0046] Furthermore, considering the support strength of the protrusion 302 structure and the size structure of the entire battery pack, the height range of the protrusion 302 is limited, that is, the distance from the top surface of the protrusion 302 to the end surface of the bracket close to the protrusion 302 is defined as H, 6mm <H≤12mm。

[0047] In this embodiment, H is designed to range from 6mm to 12mm to ensure that the protrusion 302 is of sufficient height to form a reasonable support structure between the battery cell and the bottom guard plate 201. A protrusion 302 height of 6mm or greater ensures effective isolation between the battery cell and the bottom guard plate 201, allowing the battery cell to be stably placed on the bracket and avoiding friction or damage caused by direct contact with the bottom guard plate 201. At the same time, the height of the protrusion 302 should not be too high. Using 12mm as the upper limit prevents the overall thickness of the battery pack from being too large, ensuring the battery pack's structural compactness.

[0048] Furthermore, since the plastic bracket 30 is manufactured using an injection molding process, attention must be paid to the shrinkage of the material during the molding process. Different wall thicknesses result in different cooling rates. Therefore, the present application provides a groove 3012 in the area of ​​the bracket body 301 corresponding to the protrusion 302. The distance from the end face of the groove 3012 facing away from the bracket body 301 to the end face of the protrusion 302 facing away from the bracket body 301 is the same as the thickness of the bracket body 301. In other words, the thickness of the protrusion 302 is the same as the thickness of the bracket body 301.

[0049] In this embodiment, the distance from the end face of the groove 3012 facing away from the bracket body 301 to the end face of the protrusion 302 facing away from the bracket body 301 is equal to the thickness of the bracket body 301, thereby ensuring consistency in the wall thickness of the bracket body 301 and the protrusion 302. This design ensures uniform material distribution throughout the bracket structure during the injection molding process, effectively reducing defects caused by uneven wall thickness.

[0050] During the plastic injection molding process, uneven part wall thicknesses can lead to varying cooling rates, which in turn can cause inconsistent material shrinkage. This can easily result in shrinkage marks on the part's surface and internal defects such as pores. By maintaining the same wall thickness in the bracket body 301 and protrusion 302, these uneven cooling and shrinkage phenomena can be effectively avoided, ensuring uniform shrinkage throughout the part during cooling, preventing surface shrinkage, pores, and other quality issues.

[0051] At the same time, uneven stress caused by inconsistent wall thickness can cause warping of the plastic bracket 300, affecting the part's shape stability. However, by rationally designing the groove 3012 in the bracket body 301, the thickness of the protrusion 302 area is consistent with that of the bracket body 301. This reduces the internal stress accumulation caused by uneven thickness and effectively prevents warping during cooling or after prolonged use. Furthermore, the inclusion of the groove 3012 in the bracket body 301 effectively reduces the overall weight of the bracket while maintaining structural strength.

[0052] Furthermore, in order to improve production efficiency and structural stability, the bracket body 301 and the protrusion 302 avoid the traditional method of separate injection molding and then assembly, and adopt an integrated injection molding process to form an integrated injection molding structure.

[0053] In this embodiment, the bracket body 301 and protrusion 302 are manufactured using an integrated injection molding process. Compared to traditional multi-component production processes, where the bracket body 301 and protrusion 302 typically require separate manufacturing and subsequent assembly, this integrated injection molding process combines these two steps into a single process, improving production efficiency. Furthermore, the integrated injection molding structure ensures a tight connection between the bracket body 301 and protrusion 302, eliminating the potential for looseness or misalignment associated with traditional assembly connections and ensuring the overall structural strength and stability.

[0054] Furthermore, the single cell 401 in the battery cell assembly 40 is fixed to the bracket body 301 by glue. In order to facilitate the glue injection process and beautify it, a plurality of glue injection grooves 3013 are opened on the bracket body 301. The glue injection grooves 3013 are in a circular shape and are arranged around the outer periphery of the pressure relief hole 3011. They are distributed on the side of the bracket body 301 away from the protrusion 302. The glue injection grooves 3013 are filled with glue to bond with the bottom of the single cell 401 to achieve fixation of the single cell 401 and the entire battery cell assembly 40.

[0055] In this embodiment, the glue injection groove 3013 provides a dedicated space for bonding the bracket body 301 and the single battery 401. By filling the glue injection groove 3013 with glue, the bracket and battery are firmly bonded, preventing the single battery 401 from shifting or loosening due to vibration, impact, or prolonged use. Furthermore, the glue injection groove 3013, which is arranged around the pressure relief hole 3011, evenly distributes the bonding force, preventing loosening of the battery or stress concentration caused by localized weak bonding.

[0056] At the same time, the glue injection groove 3013 clearly defines the bonding position, allowing the glue to be accurately applied to the designated area, avoiding problems such as glue loss or uneven distribution. In addition, the presence of the glue injection groove 3013 helps control the amount of glue used, avoiding excessive use of glue.

[0057] Further, see Figure 7 and Figure 8 , Figure 7 The embodiment of the present utility model provides Figure 6 Schematic diagram of the cross-sectional structure at the middle BB; Figure 8 The embodiment of the present utility model provides Figure 7 A partial enlarged schematic diagram of area C in the center. During the glue injection process, the glue injection groove 3013 may overflow. Connecting the glue injection groove 3013 with the groove 3012 allows for the glue to be poured out through the groove 3012. Specifically, several connecting channels 3014 can be provided between the glue injection groove 3013 and the groove 3012. Pipes or holes can be formed within the bracket body 301 using an injection mold, or channels can be formed on the outer surface of the bracket body 301.

[0058] In this embodiment, by connecting the glue injection groove 3013 and the groove 3012, during the glue injection process, excess glue in the glue injection groove 3013 can effectively flow into the groove 3012, thereby avoiding the phenomenon of glue being retained or overflowing in the glue injection groove 3013.

[0059] Further, see Figure 6 , Figure 6 This is a schematic diagram of the structure of a plastic bracket 30 provided in an embodiment of the present invention. To accommodate battery packs of varying sizes, multiple plastic brackets 30 can be provided. Each bracket body 301 has a plurality of retaining grooves 3015 defined along its widthwise edge. These retaining grooves 3015 are arranged along the length of the bracket body 301. The retaining grooves 3015 can be arranged evenly and at equal intervals, or they can be arranged unevenly, with denser distribution in areas subject to greater stress.

[0060] Adjacent plastic brackets 30 can be combined by gluing to form plastic brackets 30 of different sizes and structures, thereby improving the flexibility and adaptability of the system. Adjacent plastic brackets 30 can be engaged with each other through the limiting grooves 3015 to achieve precise positioning between multiple plastic brackets 30.

[0061] In this embodiment, the retaining grooves 3015 engage with each other, providing a continuous locking force that effectively prevents the bracket from shifting due to vibration or other external forces during transportation or use, thereby improving the stability of the overall structure. Adjacent plastic brackets 30, through the mutual engagement of the retaining grooves 3015, can be flexibly combined as needed, increasing or decreasing the number of brackets. This allows for easy adjustment of the overall size of the bracket to form bracket structures of varying sizes, allowing the bracket to adapt to a variety of battery pack designs and meet the needs of battery packs of different sizes and capacities.

[0062] Furthermore, in order to facilitate the alignment between the limiting grooves 3015 and improve the assembly efficiency, an arc transition structure 3016 is provided at the connection between adjacent limiting grooves 3015. The curvature radius of the arc transition structure 3016 is much smaller than the width of the limiting groove 3015. The arc transition structure 3016 can be wavy on the same plastic bracket 30. The arc transition structures between adjacent plastic brackets 30 can cooperate with each other to assist the mutual alignment of the limiting grooves 3015.

[0063] In this embodiment, an arc transition structure 3016 is used at the connection between adjacent limit grooves 3015 to provide a smoother transition. Compared with the right-angled edges of the limit grooves 3015 in the traditional design, which are prone to causing jamming or failure to align smoothly during the engagement process. In this embodiment, there are no longer right-angled or sharp edges, but a smooth transition of an arc curve, which can reduce stress concentration. Since the arc structure can form a smooth connection between adjacent limit grooves 3015, the assembler does not need to laboriously align the limit grooves 3015 on the bracket during the engagement operation. It only needs to gently slide the adjacent brackets to align them. The arc structure will naturally guide the limit grooves 3015 to align and engage smoothly, providing better alignment and fit.

[0064] Further, see Figure 3 and Figure 5 , Figure 3 The embodiment of the present utility model provides Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 5 The embodiment of the present utility model provides Figure 3A partial enlarged schematic diagram of area B in the middle. The housing 20 also includes support beams 204, which are positioned on the bottom surface of the housing 20 and can be secured by bolts, rivets, welding, adhesives, or other methods. Support beams 204, serving as structural reinforcements, are arranged in pairs, located on either side of the length of the bracket body 301, near the outer frame 202. The bracket body 301 rests on the support beams 204, providing a more stable structural support.

[0065] In this embodiment, support beams 204 are a key load-bearing and supporting structure within the housing 20. Support beams 204 are mounted on the bottom guard plate 201, forming an integrated support system with the bottom guard plate 201. The bracket body 301 is directly mounted on support beams 204. The support provided by support beams 204 creates a stable mechanical structure between the bracket body 301 and the bottom guard plate 201, providing additional support for the bracket body 301 and sharing the load pressure borne by the bracket. The shape, number, and arrangement of support beams 204 can be optimized based on the size and load requirements of the battery pack.

[0066] In some embodiments, a bottom guard plate 201 is further provided at the bottom of the box body 20 to provide further protection for the support structure.

[0067] Furthermore, an anti-slip structure 205 is provided at the connection between the bracket body 301 and the support beam 204. The anti-slip structure 205 can be provided in the area where the bottom of the bracket body 301 contacts the support beam 204, or in the area where the top surface of the support beam 204 contacts the bracket body 301. The anti-slip structure 205 can be anti-slip bumps, anti-slip strips, or anti-slip textures. These bumps 302 or stripes can be evenly distributed in the form of granules, corrugated shapes, or elongated stripes.

[0068] In this embodiment, the anti-slip structure 205 at the connection between the bracket body 301 and the support beam 204 increases the surface roughness, thereby increasing the friction between the contact surface between the bracket body 301 and the support beam 204. The increased friction means that the bracket body 301 can better resist lateral or longitudinal slippage after being placed or fixed, and can maintain a stable fixed state even under vibration or impact conditions.

[0069] Furthermore, the anti-slip structure 205 effectively prevents the bracket body 301 from sliding on the support beam 204, thereby reducing the relative movement between the plastic bracket 30 and the support beam 204. This not only reduces friction and wear between the components, but also avoids fatigue damage to the plastic bracket 30 caused by long-term sliding, thereby extending the overall service life of the plastic bracket 30 and the battery pack.

[0070] Further, see Figure 2, Figure 2 This is an exploded view of the battery pack provided by an embodiment of the present invention. The battery pack also includes mica paper 50, which is an electrically insulating material and is attached to the side of the bracket body 301 near the protrusion 302 to provide effective electrical insulation and heat protection within the battery pack.

[0071] Specifically, the mica paper 50 is provided with clearance holes 501, the positions of which correspond to the multiple protrusions 302 on the bracket body 301, ensuring that the protrusions 302 can be inserted into the clearance holes 501 to achieve good structural fit without affecting the fixed connection between the protrusions 302 and the bottom guard plate 201.

[0072] In this embodiment, mica paper 50 is a material with excellent electrical insulation properties and high temperature resistance. In the battery pack structure, by using mica paper 50 to adhere to the bracket body 301, the electrical contact between the battery cell assembly 40 and the bottom guard plate 201 can be effectively isolated, avoiding potential short circuit risks.

[0073] Furthermore, the heat resistance of the mica paper 50 helps the battery maintain stable operation in high-temperature environments, preventing damage caused by excessive temperatures. The clearance holes 501 correspond to the multiple protrusions 302 on the bracket body 301. The size and shape of each clearance hole 501 are precisely designed to perfectly match the corresponding protrusion 302. This ensures a tight fit between the mica paper 50 and the bracket body 301 while preventing the mica paper 50 from interfering with the fixed connection between the protrusion 302 and the bottom guard plate 201.

[0074] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0075] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0076] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: The box body is provided with a receiving cavity; A plastic bracket is disposed in the accommodating cavity, the plastic bracket comprising a bracket body and a plurality of protrusions, the plurality of protrusions being disposed on one side of the bracket body, the top surfaces of the plurality of protrusions being in contact with the bottom surface of the box body, a pressure relief cavity being formed between the bracket body and the bottom surface of the box body, the bracket body being provided with a plurality of pressure relief holes, the pressure relief holes being in communication with the pressure relief cavity; The battery cell assembly includes a plurality of single cells fixed in the accommodating cavity. The single cells are connected to a side of the bracket body away from the protrusion and block the pressure relief hole.

2. A battery pack according to claim 1, characterized in that: The cross section of the protrusion is circular, triangular or rectangular.

3. The battery pack according to claim 1, wherein: The area of ​​the top surface of the protrusion gradually increases to the area of ​​the bottom surface of the protrusion.

4. The battery pack according to claim 1, wherein: The distance from the top surface of the protrusion to the end surface of the bracket body close to the protrusion is H, 6mm <H≤12mm。 5. A battery pack according to any one of claims 1 to 4, characterized in that: A groove is formed in the area of ​​the bracket body corresponding to the protrusion, and the distance from the end surface of the groove away from the bracket body to the end surface of the protrusion away from the bracket body is the same as the thickness of the bracket body.

6. A battery pack according to any one of claims 1 to 4, characterized in that: The bracket body and the protrusion are an integral injection-molded structure.

7. The battery pack according to claim 5, characterized in that: The bracket body is provided with a plurality of glue injection grooves, the glue injection grooves are arranged on the side of the bracket body away from the protrusion, the glue injection grooves are arranged around the outer periphery of the pressure relief hole, the glue injection grooves are opposite to the single battery, and the glue injection grooves are used to fill glue to bond with the single battery.

8. The battery pack according to claim 7, characterized in that: The glue injection groove is communicated with the groove.

9. The battery pack according to claim 1, characterized in that: There are multiple plastic brackets, and the edge of the bracket body in the width direction is provided with multiple limiting grooves arranged along its length direction. Adjacent plastic brackets are mutually engaged through the limiting grooves to achieve limitation between the multiple plastic brackets.

10. The battery pack according to claim 9, characterized in that: An arc transition structure is provided at the connection between adjacent limiting grooves.

11. The battery pack according to claim 1, characterized in that: The box body further comprises a support beam arranged on the bottom surface of the box body, and the bracket body is mounted on the support beam.

12. The battery pack according to claim 11, characterized in that: An anti-slip structure is provided at the connection between the bracket body and the support beam.

13. The battery pack according to claim 1, characterized in that: The battery pack further comprises mica paper, which is attached to one side of the bracket body close to the protrusion. The mica paper is provided with a clearance hole, which corresponds one-to-one to the protrusion, and the protrusion is inserted into the clearance hole.

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