Battery pack and energy storage system
By combining liquid-cooled and air-cooled heat dissipation methods in the battery pack, the first heat pipe and heat dissipation fins are used to transfer heat, and the problems of small heat dissipation area and low efficiency of the traditional battery pack are solved, achieving efficient, safe and low-cost heat dissipation effects.
Patent Information
- Application Number
- CN202422280014.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The traditional battery pack has problems such as small heat dissipation area, low efficiency, poor safety and high cost.
The heat dissipation method is adopted that combines liquid cooling and air cooling. By setting a first heat pipe and heat dissipation fins in the battery pack, heat is transferred to the heat dissipation fins outside the box in turn, thereby realizing the combination of liquid cooling and air cooling, avoiding the defects of the traditional method.
It improves the heat dissipation effect, reduces system power consumption and cost, extends service life, avoids safety hazards, and simplifies structural design.
Smart Images
Figure CN223193851U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of energy storage systems, and in particular to a battery pack and an energy storage system. Background Art
[0002] Among the traditional heat dissipation methods of energy storage systems, one is to use an air cooling system, and the other is to use a liquid cooling design.
[0003] Air-cooling systems dissipate heat by adding fans to the battery pack, allowing air to flow through the gaps between the battery cells. Air conditioning in the energy storage system's enclosure then introduces cooling or heat, keeping the battery cells within a comfortable temperature range. However, air-cooling systems have low heat dissipation efficiency, and excessive cooling can lead to inadequate cooling, necessitating control of the battery pack's volume. Furthermore, the addition of additional fans not only impacts maintenance costs but also generates additional auxiliary power consumption. Furthermore, air-cooling systems employ open-type battery packs, requiring air ducts, making them less safe. Thermal runaway can easily spread to surrounding battery packs.
[0004] Liquid cooling designs circulate heat or cold from a water-cooled unit through a coolant to the battery pack's thermal management device, achieving thermal management. However, liquid cooling systems require a water-cooled unit, cooling pipes, and thermal management components for the battery pack, increasing costs and auxiliary power consumption. Furthermore, issues such as condensation in the water-cooled system, the lifespan of the water-cooled unit, leakage in the liquid-cooled system, and the lifespan of the coolant all present significant challenges and subsequent maintenance challenges.
[0005] Related art discloses a battery pack (PACK) for efficient battery energy storage management, comprising heat pipe slats, thermal fins, batteries, air conditioners, and air ducts. One end of the heat pipe slats is connected to the thermal fins, and the heat pipe slats are installed close to both sides of the batteries. Air ducts installed in the air conditioners lead to each thermal fin, forming a heat and cold source channel for regulating the temperature of the thermal fins. Although this technology combines the heat dissipation of an air-cooled system with the heat dissipation design of a liquid-cooled system and has the advantages of both heat dissipation methods, the heat pipe slats are installed close to both sides of the battery in the length direction, resulting in a small contact area between the heat pipe slats and the battery, resulting in a small heat dissipation area for the battery. Furthermore, the thermal fins are located at one end of the heat pipe slats in the length direction, resulting in poor heat dissipation of the thermal fins, resulting in poor overall heat dissipation of the battery pack (PACK) for efficient battery energy storage management. Utility Model Content
[0006] In view of this, the present invention provides a battery pack and an energy storage system to solve the problem of poor heat dissipation effect caused by a small heat dissipation area.
[0007] In a first aspect, the present invention provides a battery pack, comprising:
[0008] The box body has an accommodating cavity inside;
[0009] A battery module is disposed in the accommodating cavity and includes at least two battery cells arranged sequentially along a first direction;
[0010] a first heat pipe, at least partially connected to the bottom wall of the battery core along the second direction and extending along the third direction, the first heat pipe being located between the bottom wall of the box and the battery module;
[0011] heat dissipation fins, arranged on the bottom wall of the box body and located outside the box body;
[0012] a second heat pipe connected to the bottom wall of the box body, and connected to the first heat pipe and the heat dissipation fins on both sides in the second direction;
[0013] The first direction is the width direction of the battery core, the second direction is the height direction of the battery core, and the third direction is the length direction of the battery core; the heat dissipation fins are used to dissipate heat through air cooling.
[0014] Beneficial effect: The heat of the battery cell is transferred to the heat dissipation fins outside the box through the first heat pipe and the second heat pipe in turn, realizing liquid cooling heat dissipation. The heat dissipation fins and the second heat pipe are cooled by air cooling, realizing the combination of air cooling and liquid cooling heat dissipation. The heat transfer through the first heat pipe, the second heat pipe and the heat dissipation fins can not only extract the heat from the inside of the box, but also avoid the need to use the box normally open when using air cooling heat dissipation, resulting in lower safety. In addition, because the heat dissipation fins and the second heat pipes are cooled by air, there is no need to use water cooling units, liquid cooling pipes and other structures, which reduces costs and auxiliary power consumption and extends the overall service life. At least a portion of the first heat pipe is connected to the bottom wall of the battery cell and extends along the third direction, which is the length direction of the battery cell. It can make contact with the battery cell over a large area, and has a good heat dissipation effect. The physical principle can effectively reduce the power consumption of the system. The heat dissipation fins and the second heat pipe are directly connected to the first heat pipe from the bottom and conduct heat, which has a good heat conduction effect and further enhances the heat dissipation effect.
[0015] In an optional embodiment, a through hole is provided on the bottom wall of the box body, and the second heat pipe is embedded in the through hole on one side in the second direction and is connected to the first heat pipe through the through hole.
[0016] In an optional embodiment, the through hole is a long hole extending along the first direction, the second heat pipe extends along the first direction, and the second heat pipe is connected to the first heat pipes on the bottom walls of at least two of the battery cells.
[0017] In an optional embodiment, the through hole is a rectangular hole extending along the first direction, and the second heat pipe is a plate-shaped structure extending along the first direction.
[0018] In an optional embodiment, at least two second heat pipes are provided at intervals along the third direction, and each second heat pipe is connected to the first heat pipes on the bottom walls of at least two of the battery cells; the heat dissipation fins are sheet structures extending along the third direction, and the heat dissipation fins include at least two heat dissipation fins distributed at intervals along the first direction, and each heat dissipation fin is connected to at least two second heat pipes in sequence.
[0019] In an optional embodiment, the first heat pipe includes:
[0020] a first strip connected to the bottom wall of the battery core, extending along the third direction, and connected to the second heat pipe;
[0021] a second strip connected to a heat dissipation side wall of the battery cell, the heat dissipation side wall being a side wall of the battery cell perpendicular to the second direction, and the second strip extending along the third direction;
[0022] The connecting strip has two ends connected to the first strip and the second strip respectively.
[0023] In an optional embodiment, each of the battery cells is connected to two of the first heat pipes, and the second strips of the two first heat pipes are respectively arranged on two opposite heat dissipation side walls.
[0024] In an optional embodiment, a thermally conductive structural adhesive is further included, and the bottom wall of the battery core and at least part of the first heat pipe are bonded to the bottom wall of the box through the thermally conductive structural adhesive, and the second heat pipe is connected to the first heat pipe through the thermally conductive structural adhesive.
[0025] In a second aspect, the present invention further provides an energy storage system, comprising:
[0026] Cabinets;
[0027] An air conditioner, connected to the cabinet, for achieving air cooling and heat exchange for the battery pack inside the cabinet;
[0028] The above-mentioned battery pack is arranged in the cabinet.
[0029] In an optional embodiment, the battery packs have at least two arranged in sequence along the second direction, and the two adjacent battery packs are spaced apart to form a heat dissipation channel, and the battery pack located at the bottom is spaced apart from the bottom of the cabinet to form a heat dissipation channel. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0031] Figure 1 This is a schematic diagram of an explosion of a battery pack according to an embodiment of the present invention;
[0032] Figure 2 This is a schematic diagram of a battery cell and a first heat pipe according to an embodiment of the present utility model;
[0033] Figure 3 This is a schematic diagram of an energy storage system according to an embodiment of the present invention.
[0034] Description of reference numerals:
[0035] 1. Box body; 11. Accommodation cavity; 12. Through hole; 13. Cover plate; 2. Battery module; 21. Battery cell; 3. First heat pipe; 31. First slat; 32. Second slat; 33. Connecting slat; 4. Heat dissipation fin; 5. Second heat pipe; 6. Thermal conductive structural adhesive; 100. Cabinet; 200. Air conditioner; 300. Battery pack; 400. Heat dissipation channel. DETAILED DESCRIPTION
[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.
[0037] The following combination Figures 1 to 3 , describing the embodiments of the present utility model.
[0038] According to an embodiment of the present utility model, on the one hand, a battery pack 300 is provided, including a case 1, a battery module 2, a first heat pipe 3, a heat dissipation fin 4 and a second heat pipe 5; a housing 1 is provided with a housing cavity 11; the battery module 2 is arranged in the housing cavity 11, and includes at least two battery cells 21 arranged in sequence along a first direction; the first heat pipe 3 is at least partially connected to the bottom wall of the battery cell 21 along a second direction and extends along a third direction, and the first heat pipe 3 is located between the bottom wall of the case 1 and the battery module 2; the heat dissipation fin 4 is arranged on the bottom wall of the case 1 and is located on the outside of the case 1; the second heat pipe 5 is connected to the bottom wall of the case 1, and is connected to the first heat pipe 3 and the heat dissipation fin 4 on both sides in the second direction; wherein, the first direction is the width direction of the battery cell 21, the second direction is the height direction of the battery cell 21, and the third direction is the length direction of the battery cell 21; the heat dissipation fin 4 is used to dissipate heat through air cooling.
[0039] The heat of the battery cell 21 is transferred to the heat dissipation fins 4 outside the housing 1 in sequence through the first heat pipe 3 and the second heat pipe 5, thereby achieving liquid cooling. The heat dissipation fins 4 and the second heat pipe 5 are cooled by air, thereby achieving a combination of air cooling and liquid cooling. The heat transfer between the first heat pipe 3, the second heat pipe 5 and the heat dissipation fins 4 can not only guide the heat inside the housing 1, but also avoid the need to use the housing 1 normally open when using air cooling, which leads to lower safety. In addition, because the heat dissipation fins 4 and the second heat pipe 5 are cooled by air, there is no need to use water cooling units, liquid cooling pipes and other structures, which reduces costs and auxiliary power consumption and extends the overall service life. At least a portion of the first heat pipe 3 is connected to the bottom wall of the battery cell 21 and extends along a third direction, which is the length direction of the battery cell 21. It can make contact with the battery cell 21 over a large area, resulting in good heat dissipation effect. The physical principle can effectively reduce system power consumption. The heat dissipation fins 4 and the second heat pipe 5 are directly connected to the first heat pipe 3 from the bottom and conduct heat, which has good heat conduction effect and further enhances the heat dissipation effect.
[0040] In one embodiment, a through hole 12 is provided on the bottom wall of the box body 1 , and the second heat pipe 5 is embedded in the through hole 12 on one side in the second direction and is connected to the first heat pipe 3 through the through hole 12 .
[0041] By providing the through hole 12 on the bottom wall of the box body 1, the second heat pipe 5 can be more firmly connected to the bottom wall of the box body 1 and can be connected more closely to the first heat pipe 3 for better heat transfer and heat dissipation.
[0042] In a specific embodiment, the bottom wall of the box body 1 is made of a heat-conducting material, preferably an aluminum plate.
[0043] As a convertible embodiment, the bottom wall of the box body 1 is made of a heat-conducting material, and the first heat pipe 3 and the second heat pipe 5 are respectively connected to both sides of the bottom wall of the box body 1 .
[0044] In one embodiment, the through hole 12 is a long hole extending along the first direction, the second heat pipe 5 extends along the first direction, and the second heat pipe 5 is connected to the first heat pipe 3 on the bottom wall of at least two of the battery cells 21 .
[0045] The through hole 12 extends along the first direction, so that the second heat pipe 5 can be connected to the first heat pipe 3 on the bottom walls of at least two battery cells 21 , thereby achieving heat dissipation and heat transfer on the bottom walls of at least two battery cells 21 .
[0046] As a convertible embodiment, the extension direction of the through hole 12 may be consistent with the extension direction of the first heat pipe 3 located on the bottom wall of the battery core 21 , and each first heat pipe 3 is matched with at least one second heat pipe 5 .
[0047] In one embodiment, the through hole 12 is a rectangular hole extending along the first direction, and the second heat pipe 5 is a plate-shaped structure extending along the first direction.
[0048] The rectangular hole has a simple structure and is easy to process and shape; the second heat pipe 5 is a plate-like structure with a simple structure, which is easy to adapt to the rectangular hole.
[0049] In one embodiment, at least two second heat pipes 5 are provided at intervals along the third direction, and each second heat pipe 5 is connected to the first heat pipes 3 on the bottom walls of at least two battery cells 21; the heat dissipation fins 4 are a sheet-like structure extending along the third direction, and the heat dissipation fins 4 include at least two spaced apart along the first direction, and each heat dissipation fin 4 is connected to at least two second heat pipes 5 in sequence.
[0050] Each second heat pipe 5 can be connected to the bottom walls of at least two battery cores 21, and each battery core 21 can be connected to at least two second heat pipes 5. The heat transfer area between the second heat pipe 5 and the first heat pipe 3 is larger, and the heat transfer and heat dissipation effects are better. The extension direction of the heat dissipation fin 4 is perpendicular to the extension direction of the second heat pipe 5. One heat dissipation fin 4 can be connected to at least two second heat pipes 5, and each second heat pipe 5 is also connected to at least two heat dissipation fins 4. This makes the heat transfer area between the heat dissipation fin 4 and the second heat pipe 5 larger, and the heat transfer and heat dissipation effects are better.
[0051] In one embodiment, the first heat pipe 3 includes a first strip 31, a second strip 32 and a connecting strip 33; the first strip 31 is connected to the bottom wall of the battery core 21, extends along the third direction, and is connected to the second heat pipe 5; the second strip 32 is connected to the heat dissipation side wall of the battery core 21, the heat dissipation side wall is the side wall of the battery core 21 perpendicular to the second direction, and the second strip 32 extends along the third direction; the two ends of the connecting strip 33 are respectively connected to the first strip 31 and the second strip 32.
[0052] The first slats 31 can directly exchange heat from the battery cells 21 with the second heat pipes 5. The second slats 32 can transfer heat from the heat dissipation sidewalls of the battery cells 21 to the first slats 31 via the connecting slats 33, and exchange heat with the second heat pipes 5 through the first slats 31. The first slats 31, second slats 32, and connecting slats 33 all contact the battery cells 21 to dissipate heat, thereby increasing the heat dissipation area and enhancing the heat dissipation effect.
[0053] In one embodiment, each of the battery cores 21 is connected to two of the first heat pipes 3 , and the second strips 32 of the two first heat pipes 3 are respectively arranged on two opposite heat dissipation side walls.
[0054] Each battery core 21 is connected to two first heat pipes 3 , which can dissipate heat from both side walls of the battery core 21 , solving the problem of heat dissipation difficulty on the heat dissipation side wall between two adjacent battery cores 21 .
[0055] The first strips 31 of the two first heat pipes 3 can be spaced apart on the bottom wall of the battery core 21 or can be close to each other to increase the heat dissipation area.
[0056] In one embodiment, a thermally conductive structural adhesive 6 is further included, and the bottom wall of the battery core 21 and at least part of the first heat pipe 3 are bonded to the bottom wall of the box body 1 through the thermally conductive structural adhesive 6, and the second heat pipe 5 is connected to the first heat pipe 3 through the thermally conductive structural adhesive 6.
[0057] The heat-conducting structural adhesive 6 can not only bond the bottom wall of the battery core 21 and at least a portion of the first heat pipe 3 to the bottom wall of the box body 1 , but also achieve heat conduction.
[0058] Specifically, the box body 1 of the battery pack 300 further includes a cover plate 13 , which is connected to the top of the box body 1 to seal the accommodating cavity 11 of the box body 1 .
[0059] According to an embodiment of the present invention, on the other hand, an energy storage system is also provided, including a cabinet 100, an air conditioner 200 and a battery pack 300; the air conditioner 200 is connected to the cabinet 100, and is used to realize air cooling and heat exchange of the battery pack 300 inside the cabinet 100; the above-mentioned battery pack 300 is arranged in the cabinet 100.
[0060] The heat from the battery cells 21 in the battery pack 300 housing 1 is transferred to the outside of the battery pack 300 through the first heat pipe 3, the second heat pipe 5, and the heat dissipation fins 4, and then air-cooled by the air conditioner 200 connected to the cabinet 100, thus achieving a combination of liquid-cooled and air-cooled heat exchange. This not only allows the heat inside the housing 1 to be extracted, avoiding the need to use the housing 1 normally when using air-cooled heat dissipation, resulting in lower safety, but also eliminates the need to use water-cooled units, liquid-cooled pipes, and other structures because the heat dissipation fins 4 and the second heat pipes 5 is air-cooled, thus reducing costs and auxiliary power consumption and extending the overall service life. It also avoids many problems of traditional liquid cooling systems, such as condensed water leakage, coolant replacement, and high maintenance requirements, thereby reducing the auxiliary power consumption of the energy storage system and improving operating efficiency.
[0061] In one embodiment, the battery packs 300 have at least two arranged in sequence along the second direction, and the two adjacent battery packs 300 are spaced apart to form a heat dissipation channel 400, and the battery pack 300 located at the bottom is spaced apart from the bottom of the cabinet 100 to form a heat dissipation channel 400.
[0062] The provision of the heat dissipation channel 400 facilitates the flow of cooling air for air-cooling heat dissipation, so as to better dissipate heat from the battery pack 300 .
[0063] Specifically, the protection level of the energy storage system of this embodiment is equal to or lower than IP54.
[0064] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by this application.
Claims
1. A battery pack, characterized in that: include: A box body (1) is provided with a receiving cavity (11) therein; A battery module (2) is arranged in the accommodating cavity (11), comprising at least two battery cells (21) arranged sequentially along a first direction; a first heat pipe (3), at least partially connected to the bottom wall of the battery core (21) along the second direction and extending along the third direction, wherein the first heat pipe (3) is located between the bottom wall of the box (1) and the battery module (2); Heat dissipation fins (4) are arranged on the bottom wall of the box body (1) and are located outside the box body (1); A second heat pipe (5) is connected to the bottom wall of the box (1), and is respectively connected to the first heat pipe (3) and the heat dissipation fins (4) on both sides in the second direction; The first direction is the width direction of the battery core (21), the second direction is the height direction of the battery core (21), and the third direction is the length direction of the battery core (21); and the heat dissipation fins (4) are used for heat dissipation through air cooling.
2. The battery pack according to claim 1, wherein: A through hole (12) is provided on the bottom wall of the box body (1); the second heat pipe (5) is embedded in the through hole (12) on one side in the second direction and passes through the through hole (12) to be connected to the first heat pipe (3).
3. The battery pack according to claim 2, wherein: The through hole (12) is a long hole extending along the first direction, the second heat pipe (5) extends along the first direction, and the second heat pipe (5) is connected to the first heat pipe (3) on the bottom wall of at least two of the battery cells (21).
4. The battery pack according to claim 3, wherein: The through hole (12) is a rectangular hole extending along the first direction, and the second heat pipe (5) is a plate-shaped structure extending along the first direction.
5. The battery pack according to claim 3, wherein: At least two second heat pipes (5) are arranged at intervals along the third direction, and each second heat pipe (5) is connected to the first heat pipes (3) on the bottom walls of at least two battery cells (21); the heat dissipation fins (4) are sheet-like structures extending along the third direction, and the heat dissipation fins (4) include at least two heat dissipation fins (4) spaced apart along the first direction, and each heat dissipation fin (4) is sequentially connected to at least two second heat pipes (5).
6. The battery pack according to claim 1, wherein: The first heat pipe (3) comprises: a first strip (31) connected to the bottom wall of the battery core (21), extending along the third direction, and connected to the second heat pipe (5); a second strip (32) connected to a heat dissipation side wall of the battery core (21), the heat dissipation side wall being a side wall of the battery core (21) perpendicular to the second direction, and the second strip (32) extending along the third direction; The connecting strip (33) has two ends connected to the first strip (31) and the second strip (32) respectively.
7. The battery pack according to claim 6, characterized in that: Two of the first heat pipes (3) are connected to each of the battery cores (21), and the second strips (32) of the two first heat pipes (3) are respectively arranged on two opposite heat dissipation side walls.
8. The battery pack according to any one of claims 1 to 7, characterized in that: It also includes a heat-conducting structural adhesive (6), the bottom wall of the battery core (21) and at least part of the first heat pipe (3) are bonded to the bottom wall of the box (1) through the heat-conducting structural adhesive (6), and the second heat pipe (5) is connected to the first heat pipe (3) through the heat-conducting structural adhesive (6).
9. An energy storage system, characterized in that: include: Cabinet (100); an air conditioner (200), connected to the cabinet (100), for achieving air cooling and heat exchange for the battery pack (300) inside the cabinet (100); The battery pack (300) according to any one of claims 1 to 8 is arranged in the cabinet (100).
10. The energy storage system according to claim 9, characterized in that: The battery packs (300) have at least two battery packs (300) sequentially arranged along the second direction, two adjacent battery packs (300) are spaced apart to form a heat dissipation channel (400), and the battery pack (300) located at the bottom is spaced apart from the bottom of the cabinet (100) to form a heat dissipation channel (400).