Power battery pack

Abstract

The utility model discloses a power battery pack, and relates to the field of energy storage equipment, a side wall surrounds a battery module from the periphery, a lower cover assembly is fixed at the lower end of the side wall, an upper cover assembly is assembled at the upper end of the side wall, and the side wall, the lower cover assembly and the upper cover assembly define a space for accommodating the battery module; the inner cavity of the side wall is divided into a plurality of phase change chambers by the side interlayer arranged in the inner cavity of the side wall, and the phase change medium in each phase change chamber can conduct heat between the inner surface and the outer surface of the side interlayer, so that the battery module has good heat dissipation performance; and the side interlayer is arranged in the inner cavity of the side wall, so that better buffer protection performance can be provided when the battery pack is impacted by the outside, and falling and collision are effectively resisted.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment, and more specifically to a power battery pack. Background Technology

[0002] A battery cell is the most basic component of a battery, typically an electrochemical device encapsulated in a metal casing. A battery module is a unit assembled from multiple battery cells, used to provide higher voltage and capacity. A battery pack is a higher-level component in a battery system, typically consisting of several battery modules, connectors, a battery management system (BMS), a cooling system, electrical interfaces, and a casing.

[0003] Battery packs require good heat dissipation performance. Under extreme conditions such as drops and collisions, existing battery packs often suffer from structural instability, easy damage, and poor heat dissipation, which can lead to damage to the battery module or even safety accidents.

[0004] For those skilled in the art, how to effectively resist drops and impacts while maintaining good heat dissipation performance is a technical problem that needs to be solved. Utility Model Content

[0005] The core of this utility model is to provide a power battery pack with a side interlayer set in the inner cavity of the side wall to effectively resist drops and collisions while maintaining good heat dissipation performance. The specific solution is as follows:

[0006] A power battery pack includes a sidewall, a side interlayer, a lower cover assembly, an upper cover assembly, and a battery module;

[0007] The sidewall surrounds the battery module from all sides, the lower cover assembly is fixed to the lower end of the sidewall, and the upper cover assembly is assembled to the upper end of the sidewall. The sidewall, the lower cover assembly, and the upper cover assembly together form a space for accommodating the battery module.

[0008] The side interlayer is disposed in the inner cavity of the side wall, and the side interlayer divides the inner cavity of the side wall into several phase change chambers. Each phase change chamber contains a phase change medium for conducting heat between the inner and outer surfaces of the side interlayer.

[0009] Optionally, a shock-absorbing layer may be provided between the lower cover assembly and the battery module, or between the side wall and the battery module.

[0010] Optionally, a power board is disposed between the top cover assembly and the battery module, and a cooling fan and heat dissipation fins are mounted on the top cover assembly.

[0011] Optionally, the sidewall includes an outer groove and an outer plate. The outer groove includes an upper plate, a vertical plate, and a bottom plate fixed in sequence. The upper plate surrounds the side interlayer from above, and the bottom plate surrounds the side interlayer from below. The vertical plate and the outer plate surround the side interlayer from the inner and outer sides, respectively.

[0012] Optionally, the base plate is a horizontal plate, and a plurality of first clearance notches are provided at intervals at the junction of the horizontal plate and the vertical plate;

[0013] Each of the first clearance gaps is provided with a corresponding positioning protection plate, which is used to engage with the positioning gap at the lower edge of the side interlayer.

[0014] Optionally, the base plate is a bent plate, and a number of second clearance notches are provided at intervals at the junction of the horizontal and vertical plates of the bent plate;

[0015] The solid portion between the two second clearance notches is used to engage with the positioning notch provided on the lower edge of the side interlayer.

[0016] Optionally, the outer side panel and the lower cover assembly are integrally bent from sheet metal;

[0017] The upper edge of the outer side panel is provided with an inward folding area, and the upper cover assembly is fitted outside the inward folding area.

[0018] Optionally, the battery module includes a battery cell, a mounting frame, and a circumferential limiting frame. The mounting frame is disposed above the battery cell, and both ends of the mounting frame are respectively fixed to the side wall. The circumferential limiting frame is used to circumferentially surround and limit the battery cell.

[0019] Optionally, the fixing frame includes a fixed base plate and two fixed side plates, the fixed base plate and the two fixed side plates forming a wiring groove;

[0020] The fixed side plate has wire-passing holes spaced apart.

[0021] Optionally, the mounting bracket is located in the middle of the battery cell.

[0022] This utility model provides a power battery pack with side walls surrounding the battery module. A lower cover assembly is fixed to the lower end of the side wall, and an upper cover assembly is assembled to the upper end of the side wall. The side wall, lower cover assembly, and upper cover assembly together form a space for accommodating the battery module. The inner cavity of the side wall is divided into several phase change chambers by a side interlayer. The phase change medium in each phase change chamber can conduct heat between the inner and outer surfaces of the side interlayer, thereby giving the battery module good heat dissipation performance. The side interlayer in the inner cavity of the side wall provides better cushioning and protection when the battery pack is subjected to external impacts, effectively resisting drops and collisions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 An isometric view of a specific embodiment of the power battery pack provided by this utility model;

[0025] Figure 2 for Figure 1 Axonometric section along the AA direction;

[0026] Figure 3 for Figure 1 Axonometric section in the middle BB direction;

[0027] Figure 4 Axonometric drawing of a side interlayer outside the battery module;

[0028] Figure 5 for Figure 4 Axonometric view of the middle section after removing the side interlayer;

[0029] Figure 6 This is an isometric view of the battery module.

[0030] Figure 7 An isometric view of the power board, cooling fan, and heat sink fins working together.

[0031] Figure 8 Axonometric view of the fit between the outer groove and the side interlayer in the first embodiment;

[0032] Figure 9 Axonometric view of the fit between the outer groove and the side interlayer in the second embodiment;

[0033] Figure 10 Axonometric drawing for matching the lower cover assembly and the outer side panel;

[0034] Figure 11 This is an isometric view of the upper cover assembly;

[0035] Figure 12 This is an isometric view of the mounting bracket.

[0036] Figure 13 This is an isometric view of the positioning protection plate.

[0037] The image includes:

[0038] Side wall 1, outer groove 11, upper plate 111, vertical plate 112, bottom plate 113, horizontal plate 1131, bent plate 1132, first clearance notch 114, positioning protection plate 1141, vertical positioning plate 1141A, positioning support base 1141B, insertion rod 1141C, second clearance notch 115, outer plate 12, side interlayer 2, positioning notch 21, insertion hole 22, lower cover assembly 3, shock absorption layer 31, upper cover assembly 4, battery module 5, battery cell 51, fixing bracket 52, fixing base plate 521, fixing side plate 522, wire hole 523, circumferential limit frame 53, power plate 6, cooling fan 7, cooling fins 71. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solution of this utility model, the power battery pack of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] This utility model provides a power battery pack, combined with Figure 1 , Figure 2 , Figure 3 As shown, the power battery pack includes components such as side wall 1, side interlayer 2, lower cover assembly 3, upper cover assembly 4, and battery module 5.

[0041] The battery module 5 is a component for storing electricity. The side walls 1 surround the battery module 5 from all sides. The lower cover assembly 3 is fixed to the lower end of the side wall 1, and the upper cover assembly 4 is assembled to the upper end of the side wall 1. The side walls 1, the lower cover assembly 3, and the upper cover assembly 4 together form a space for accommodating the battery module 5. Typically, the shape of the battery module 5 is similar to that of the power battery pack. When the battery module 5 is a cuboid, the shape of the power battery pack is roughly a cuboid. In this case, four side walls 1 are provided, surrounding the outside of the battery module 5 from all sides.

[0042] The side wall 1 is a hollow structure. A side interlayer 2 is installed within the cavity of the side wall 1, filling the interior of the side wall 1. The side interlayer 2 divides the cavity of the side wall 1 into several phase change chambers. Figure 4As shown, the side interlayer 2 has several through-channel structures at both ends. The direction of the channel structures can be perpendicular to the inner and outer surfaces, or it can have a certain angle of inclination with the inner and outer surfaces. The inner and outer surfaces of the side wall 1 and the channels in the side interlayer 2 together form a phase change chamber. The inner and outer surfaces of the side wall 1 serve as the inner and outer end faces of the phase change chamber, respectively. When the side interlayer 2 is assembled inside the side wall 1, it divides the interior of the side wall 1 into several phase change chambers. The phase change chambers can have various different structures. For example, each phase change chamber can be completely independent, or two or more phase change chambers can be interconnected, forming a group of conductive chambers from several small phase change chambers with interconnected parts.

[0043] The channel structure provided on the side interlayer 2 in this utility model can have different forms, combined with Figure 8 , Figure 9 As shown, the channel structure is a hexagonal prism honeycomb structure. The channel structure can also adopt other shapes such as triangular prism, quadrangular prism or cylinder, and these specific shapes should be included within the protection scope of this utility model.

[0044] Each phase change chamber contains a phase change medium (PCM), which is a material that can undergo a phase change (such as from solid to liquid or from liquid to gas) at a specific temperature. During the phase change process, these materials absorb or release a large amount of latent heat. The PCM is used to conduct heat between the inner and outer surfaces of the side interlayer 2. For example, when the battery module 5 is working, it generates heat. The phase change material near the inner end face of the phase change chamber absorbs heat and heats up, changing from solid to liquid (or from liquid to gas). It then releases heat to the outside near the outer end face of the phase change chamber and re-condenses. Through this heat conduction process, heat is quickly dissipated, improving the heat dissipation efficiency of the power battery pack during operation.

[0045] A phase change chamber is formed by sidewall 1 and side interlayer 2 and filled with phase change material. When the internal temperature is high, heat can be quickly conducted through the phase change process; when the external temperature is low, the phase change material provides a certain degree of insulation to prevent the internal battery module 5 from getting too cold. The side interlayer 2 is set in the inner cavity of sidewall 1. When the battery pack is subjected to external impact, it can provide better cushioning and protection. The external impact will first cause sidewall 1 and side interlayer 2 to deform. The deformation of sidewall 1 and side interlayer 2 will achieve a cushioning effect, preventing the internal battery module 5 from being damaged by impact and effectively resisting drops and collisions.

[0046] Combination Figure 2 , Figure 3As shown, this utility model provides a shock-absorbing layer 31 between the lower cover assembly 3 and the battery module 5. Alternatively, a shock-absorbing layer 31 can be provided between each side wall 1 and the battery module 5. The shock-absorbing layer 31 can be made of rubber or cotton pads, thus providing a cushioning effect for the battery module 5. For the shock-absorbing layer 31 between the side wall 1 and the battery module 5, thermally conductive silicone is used to ensure heat conduction to the side wall 1.

[0047] Combination Figure 2 , Figure 3 , Figure 7 As shown, a power board 6 is disposed between the upper cover assembly 4 and the battery module 5. A cooling fan 7 and heat dissipation fins 71 are mounted on the upper cover assembly 4. The DC-DC power board 6 is fixed to the lower side of the upper cover assembly 4. The power board 6 or the upper side of the upper cover assembly 4 has a cooling fan 7 and heat dissipation fins 71. The heat dissipation fins 71 are made of a high thermal conductivity metal to increase the heat dissipation area and achieve rapid heat dissipation. The cooling fan 7 is used to provide active cooling airflow for the heat-generating components on the power board 6, dissipating heat into the air with the airflow.

[0048] The side wall 1 used in this utility model includes an outer groove 11 and an outer plate 12. The outer groove 11 and the outer plate 12 are spliced ​​together to form the side wall 1. Each side wall 1 is set relatively independently, that is, it is formed by the outer groove 11 and the outer plate 12 respectively, and the side wall 1 is welded to form a structure that surrounds the battery module 5.

[0049] Combination Figure 8 , Figure 9 As shown, the outer groove 11 includes an upper plate 111, a vertical plate 112, and a bottom plate 113 fixed in sequence. The upper plate 111 surrounds the side interlayer 2 from above, and the bottom plate 113 surrounds the side interlayer 2 from below. The vertical plate 112 and the outer plate 113 are vertically arranged parallel to each other, surrounding the side interlayer 2 from both the inner and outer sides, respectively. The upper plate 111, the vertical plate 112, and the bottom plate 113 are connected end to end to form a three-sided enclosed groove structure, serving as a space to accommodate the side interlayer 2. A sealing film can be provided at the contact position between the outer groove 11 and the outer plate 12 to prevent leakage of the phase change medium.

[0050] This utility model provides two different structural designs for the outer groove 11:

[0051] 1) Combining Figure 8As shown, the base plate 113 is a horizontal plate 1131. The entire outer groove 11 is formed by bending a single sheet metal plate. Several first clearance notches 114 are provided at intervals at the junction of the horizontal plate 1131 and the vertical plate 112. The arrangement direction of the first clearance notches 114 is along the length extension direction of the base plate 113. The first clearance notches 114 are formed by partially hollowing out the horizontal plate 1131 and partially hollowing out the vertical plate 112. The horizontal plate 1131 and the upper plate 111 are respectively fixed to the lower edge and upper edge of the vertical plate 112. Both the horizontal plate 1131 and the upper plate 111 protrude towards the same side. The lower surface of the horizontal plate 1131 contacts and is welded to the lower cover assembly 3. The weld seam is located at the position where the edge of the first clearance notch 114 contacts the lower cover assembly 3. Setting the weld seam at this position can prevent the protrusion at the weld seam from contacting the battery module 5. The first clearance notch 114 provides clearance space for the welding equipment, which is beneficial for the welding equipment to extend into the welding area. The horizontal plate 1131 and the upper plate 111 are oriented away from the battery module 5, so that the lower surface of the battery module 5 is in contact with the lower cover assembly 3, so that the bottom of the battery module 5 is evenly pressed.

[0052] Each first clearance notch 114 is provided with a corresponding positioning protection plate 1141. The positioning protection plate 1141 has an upwardly protruding structure and is used to engage with the positioning notch 21 on the lower edge of the side interlayer 2, thereby positioning the side interlayer 2. In addition to its positioning function, the positioning protection plate 1141 also protects the portion of the side interlayer 2 exposed to the clearance notch from damage by materials during welding, preventing any impact on the side interlayer 2's impact resistance and heat dissipation performance. The positioning protection plate 1141 maintains contact with the positioning notch 21 and is made of a high thermal conductivity material to facilitate heat transfer. During installation, the positioning protection plate 1141 is first fixed to the side interlayer 2, and then positioned with the clearance notch 114.

[0053] Combination Figure 13 As shown, the positioning protection plate 1141 includes a vertical positioning plate 1141A that mates with the vertical plate 112 and a positioning support base 1141B that mates with the horizontal plate 1131. The support base 1141B contacts the upper surface of the horizontal plate 1131, and the vertical positioning plate 1141A remains parallel to the vertical plate 112. Several insert rods 1141C protrude from the edge of the vertical plate 112. The insert rods 1141C can be inserted into the insertion holes 22 provided in the side interlayer 2. The insertion holes 22 are located near the positioning notch 21, allowing the side interlayer 2 and the positioning protection plate 1141 to mate with each other. The vertical positioning plate 1141A, the positioning support base 1141B, and the insert rods 1141C can be formed by bending sheet metal. During installation, the insert rods 1141C are inserted and positioned in the side interlayer 2, then the positioning protection plate 1141 is positioned with the clearance notch 114, and the positioning protection plate 1141 and the horizontal plate 1131 are fixed by welding.

[0054] 2) Combining Figure 9 As shown, the base plate 113 is a bent plate 1132, which includes two plates: a horizontal plate and a vertical plate bent at right angles. The entire outer groove 11 is formed by bending a single sheet metal plate. Several second clearance notches 115 are spaced apart at the junction of the horizontal and vertical plates of the bent plate 1132, and these second clearance notches 115 are arranged along the length of the base plate 113. The solid portion between two second clearance notches 115 is used to engage with a positioning notch 21 on the lower edge of the side interlayer 2, thus achieving positioning and engagement of the side interlayer 2 through the solid portion between the two second clearance notches 115.

[0055] In this structure, the bending plate 1132 and the upper plate 111 are fixed to the lower and upper edges of the vertical plate 112, respectively. The bending plate 1132 and the upper plate 111 are both facing away from the battery module 5. A weld is provided at the position where the lower edge of the bending plate 1132 contacts the lower cover assembly 3. The vertical plate 112 contacts the side wall of the battery module 5, so the battery module 5 will not contact the weld, ensuring that the bottom surface of the battery module 5 is subjected to uniform force.

[0056] Both structural designs for the outer groove 11 can be applied to the same power battery pack simultaneously, combined with Figure 4 , Figure 5 As shown, the smaller side adopts structure 1) and the larger side adopts structure 2). Alternatively, the same structural design can be used for all the outer slots 11 of a power battery pack.

[0057] The outer side panel 12 and the lower cover assembly 3 are formed by integral bending of sheet metal, combined with Figure 10 As shown, the lower cover assembly 3 is a flat plate, and four outer side plates 12 are connected and fixed to the four edges of the lower cover assembly 3. The four outer side plates 12 and the lower cover assembly 3 are integrally bent to form a groove-shaped receiving space with an opening at the top. After bending, the edges of adjacent outer side plates 12 contact and are welded to fix them.

[0058] The upper edge of the outer panel 12 has an inward folding area, and the upper cover assembly 4 is fitted outside the inward folding area, combined with... Figure 2 , Figure 3 As shown, when the upper cover assembly 4 is assembled to the outer side panel 12, the upper cover assembly 4 is located outside the inward folding area, and there is an overlapping area between the upper cover assembly 4 and the outer side panel 12. This prevents external water from flowing into the outer side panel 12, thus achieving a waterproof effect. Combined with... Figure 11 As shown, the upper cover assembly 4 has four vertically arranged mounting panels, each with a through hole. When the upper cover assembly 4 and the outer side panel 12 overlap, they are fixed by screws or rivets.

[0059] Based on any of the above technical solutions and their combinations, combined with Figure 6As shown, the battery module 5 of this utility model includes a battery cell 51, a fixing frame 52, and a circumferential limiting frame 53. Several battery cells 51 are placed side-by-side. The fixing frame 52 is positioned above the battery cells 51, and its two ends are fixed to the side wall 1. The two ends of the fixing frame 52 are provided with ear plates for contacting the upper plate 111 of the outer groove 11, which can be fixed with screws. The circumferential limiting frame 53 is used to circumferentially surround and limit the battery cells 51. Figure 6 When the CCP sets two circumferential limiting frames 53, it binds the multiple arranged cells 51 into a whole.

[0060] Combination Figure 12 As shown, the mounting bracket 52 includes a fixed base plate 521 and two fixed side plates 522. The fixed base plate 521 and the two fixed side plates 522 are integrally formed from sheet metal. The two fixed side plates 522 are folded upwards, forming a wiring groove. The wire harnesses of each battery cell 51 can extend along the wiring groove. Wire passage holes 523 are provided at intervals on the fixed side plates 522, and the wire harnesses of each battery cell 51 can pass through the wire passage holes 523 and enter the wiring groove.

[0061] The fixing frame 52 of this utility model is located in the middle of the battery cell 51, and only one fixing frame 52 is needed for the entire battery module 5; the wire harness is bound to the fixing frame 52 by straps or cable ties.

[0062] This utility model, through optimized structural design, the use of high-strength materials, and integrated safety protection measures, can not only effectively resist impacts under extreme conditions such as drops and collisions, but also maintain good heat dissipation performance, ensuring the safe and stable operation of the battery module. It has significant beneficial effects and advantages:

[0063] Through meticulous structural design, this invention successfully achieves lightweight battery pack while maintaining high strength and stability. Structural optimization enables the battery pack to better disperse and absorb impact forces under extreme conditions such as drops and collisions, thereby effectively protecting the battery module from damage.

[0064] The structural design employs a porous structure, encapsulated with lightweight phase change material. While reducing weight, it also fully considers heat dissipation, ensuring effective heat dissipation during prolonged use and maintaining the appropriate operating temperature of the battery module. Good heat dissipation performance helps extend battery life, improve battery efficiency, and reduce safety hazards caused by overheating.

[0065] This invention integrates multiple safety protection measures, including but not limited to drop protection, collision protection design, and potential fire and explosion protection functions. These safety measures work together to significantly improve the safety of the battery pack under various extreme conditions and reduce the risk of accidents.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power battery pack, characterized in that, It includes sidewalls (1), side interlayers (2), lower cover assembly (3), upper cover assembly (4) and battery module (5); The side wall (1) surrounds the battery module (5) from all sides. The lower cover assembly (3) is fixed to the lower end of the side wall (1). The upper cover assembly (4) is assembled to the upper end of the side wall (1). The side wall (1), the lower cover assembly (3) and the upper cover assembly (4) together form a space for accommodating the battery module (5). The side interlayer (2) is provided in the inner cavity of the side wall (1). The side interlayer (2) divides the inner cavity of the side wall (1) into several phase change chambers. Each phase change chamber contains a phase change medium for conducting heat between the inner and outer surfaces of the side interlayer (2).

2. The power battery pack according to claim 1, characterized in that, A shock-absorbing layer (31) is provided between the lower cover assembly (3) and the battery module (5), or between the side wall (1) and the battery module (5).

3. The power battery pack according to claim 1, characterized in that, A power board (6) is provided between the top cover assembly (4) and the battery module (5), and a cooling fan (7) and cooling fins (71) are installed on the top cover assembly (4).

4. The power battery pack according to claim 1, characterized in that, The side wall (1) includes an outer groove (11) and an outer plate (12). The outer groove (11) includes an upper plate (111), a vertical plate (112) and a bottom plate (113) fixed in sequence. The upper plate (111) surrounds the side interlayer (2) from above, and the bottom plate (113) surrounds the side interlayer (2) from below. The vertical plate (112) and the outer plate (12) surround the side interlayer (2) from the inner and outer sides, respectively.

5. The power battery pack according to claim 4, characterized in that, The base plate (113) is a horizontal plate (1131), and a number of first clearance gaps (114) are provided at intervals at the junction of the horizontal plate (1131) and the vertical plate (112). Each of the first clearance notches (114) is provided with a positioning protection plate (1141), which is used to engage with the positioning notch (21) provided on the lower edge of the side interlayer (2).

6. The power battery pack according to claim 4, characterized in that, The base plate (113) is a bent plate (1132), and a number of second clearance notches (115) are provided at intervals at the junction of the horizontal plate and the vertical plate of the bent plate (1132). The solid portion between the two second clearance notches (115) is used to engage with the positioning notch (21) provided on the lower edge of the side interlayer (2).

7. The power battery pack according to claim 4, characterized in that, The outer side panel (12) and the lower cover assembly (3) are integrally bent from sheet metal. The upper edge of the outer side panel (12) is provided with an inward folding area, and the upper cover assembly (4) is fitted outside the inward folding area.

8. The power battery pack according to any one of claims 1 to 7, characterized in that, The battery module (5) includes a battery cell (51), a mounting bracket (52) and a circumferential limiting frame (53). The mounting bracket (52) is located above the battery cell (51), and both ends of the mounting bracket (52) are fixed to the side wall (1). The circumferential limiting frame (53) is used to circumferentially surround and limit the battery cell (51).

9. The power battery pack according to claim 8, characterized in that, The fixing frame (52) includes a fixing base plate (521) and two fixing side plates (522), the fixing base plate (521) and the two fixing side plates (522) forming a wiring groove; The fixed side plate (522) has wire holes (523) spaced apart.

10. The power battery pack according to claim 8, characterized in that, The mounting bracket (52) is located in the middle of the battery cell (51).

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