Battery pack and electric device

Abstract

The utility model relates to battery technology field discloses a kind of battery pack and electrical equipment, comprising: first cooling plate and mounting frame;Along X direction arrangement's battery cell, install in mounting frame, and battery cell is bonded on first cooling plate;Along Z direction, the top end of battery cell has a pair of pole, respectively located the two ends of battery cell along Y direction, and gasket is equipped on pole;The protruding part of the top end of battery cell is located between a pair of pole;Second cooling plate is bonded on protruding part and gasket;Along Z direction, the bottom end of battery cell is equipped with explosion-proof valve, and first cooling plate is equipped with through-hole corresponding with explosion-proof valve.The utility model simultaneously cools the bottom of battery cell, gasket, pole and the upper portion of battery cell by first cooling plate and second cooling plate being arranged in the upper and lower ends of battery cell, increase the heat dissipation area of battery cell, reduce the temperature rise of battery cell, gasket and pole, to improve fast charging ratio and the safety performance of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and electrical equipment. Background Technology

[0002] Battery packs are generally composed of multiple cells. Cells such as lithium-ion cells are widely used in various fields such as transportation power supply, power storage power supply, new energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] Currently, as the fast charging rate of battery packs increases, the terminals and plates generate more and more heat during high-rate charging, which reduces the safety risk of the battery pack due to the high fast charging rate. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and electrical equipment to solve the problem of low battery pack safety caused by severe overheating of the battery cells.

[0005] In a first aspect, this utility model provides a battery pack, comprising: A first cooling plate and a mounting frame disposed on the first cooling plate along the Z direction, wherein the two ends of the mounting frame have interconnected openings. At least one column of battery cells arranged sequentially along the X direction is installed in the mounting frame, and the battery cells are bonded to the first cooling plate; Along the Z direction, the top of the battery cell has a pair of terminals, located at both ends of the battery cell along the Y direction, and a tab is provided on the terminals; the top of the battery cell also has a protrusion, which is located between the pair of terminals; The second cooling plate is bonded to the protrusion and the plate. Along the Z direction, an explosion-proof valve is provided at the bottom of the battery cell, and a through hole corresponding to the explosion-proof valve is provided on the first cooling plate.

[0006] Beneficial effects: By placing a first cooling plate at the bottom of the battery pack and bonding the battery cells to it, the first cooling plate can directly dissipate the basic heat generated by the battery cells during operation and charging. Simultaneously, a second cooling plate is placed at the top of the contact plate and protrusions, allowing the second cooling plate in the upper space of the battery pack to cool the contact plate, terminals, and upper part of the battery cells. This increases the heat dissipation area of ​​the battery cells, reduces the temperature rise of the cells, contact plates, and terminals, thereby improving the fast charging rate and enhancing the safety performance of the battery pack. Furthermore, placing the explosion-proof valve at the bottom of the battery cell prevents ejected material from splashing onto the contact plate and terminals when the explosion-proof valve opens, reducing the risk of thermal runaway propagation. Additionally, through holes are provided on the first cooling plate at positions corresponding to the explosion-proof valve, ensuring unobstructed venting of the explosion-proof valve.

[0007] In one alternative embodiment, the battery cell includes a battery cell housing having a receiving cavity and an opening communicating with the receiving cavity; The electrode assembly is installed within the receiving cavity; A cell cover plate is installed at the opening to seal the opening; Along the Z-direction, the explosion-proof valve is located at the bottom of the cell housing.

[0008] Beneficial effects: By placing the explosion-proof valve at the bottom of the cell housing, when the explosion-proof valve of the cell is opened, the ejected material at the explosion-proof valve will not splash onto the battery plate and electrode, reducing the risk of thermal runaway propagation.

[0009] In one alternative embodiment, the protrusion is located on the cell cover plate and extends upward from the upper surface of the cell cover plate along the Z direction.

[0010] Beneficial effects: During the charging or use of the battery cell, the heat generated by the electrode assembly can be transferred to the battery cell cover, terminals and plates, and further transferred to the second cooling plate connected to the protrusion, terminals and plates. The second cooling plate then dissipates the heat, thereby cooling the plates, terminals and the upper part of the battery cell and reducing the temperature rise of the battery cell, plates and terminals.

[0011] In an optional embodiment, a first thermally conductive structural adhesive is further included, located between the battery cell and the first cooling plate, wherein the battery cell and the first cooling plate are bonded together by the first thermally conductive structural adhesive. An insulating component is installed inside the through hole, and the upper surface of the insulating component is located on the same plane as the upper surface of the first thermally conductive structural adhesive.

[0012] Beneficial effects: By installing an insulating component inside the through hole, the first thermally conductive structural adhesive can cover all bottom areas of the battery cell except for the explosion-proof valve, thus ensuring the adhesion and thermal conductivity of the battery cell; at the same time, the height limitation of the insulating component prevents the first thermally conductive structural adhesive from overflowing, avoiding the first thermally conductive structural adhesive from covering the explosion-proof valve, thus ensuring safe pressure relief.

[0013] In one optional embodiment, the first cooling plate includes a first flat plate and a first flow channel plate, and the battery cell is bonded to the first flat plate; the through hole is a stepped hole with a larger opening at the top and a smaller opening at the bottom, the larger opening of the stepped hole is located on the first flat plate, and the smaller opening of the stepped hole is located on the first flow channel plate; the insulating member matches the larger opening, and the insulating member is installed in the larger opening and abuts against the stepped surface of the stepped opening.

[0014] Beneficial effects: The first cooling plate is formed by combining a first flat plate and a first flow channel plate. The first flat plate is located on the upper layer and directly contacts the bottom of the battery cell. The first flat plate provides a flat bonding surface, allowing the battery cell to adhere stably to it, ensuring cell fixation and heat transfer from the bottom of the battery cell. The first flow channel plate is located on the lower layer and is attached to the first flat plate. A first flow channel is formed between the first flat plate and the first flow channel plate, allowing coolant to flow within the first flow channel to absorb the heat transferred from the battery cell by the first flat plate, thus achieving heat dissipation from the bottom of the battery cell.

[0015] On the first cooling plate, the through-hole is a stepped hole, wider at the top and narrower at the bottom. The larger hole of the stepped hole is on the first flat plate, and the smaller hole is on the first flow channel plate, causing the edge of the first flow channel plate to extend beyond the edge of the first flat plate, thus forming a stepped through-hole. When installing the insulating component into the through-hole, the stepped hole allows for easier and more accurate placement of the insulating component, thereby securing it within the through-hole, improving the stability of the insulating component installation, and effectively preventing the first thermally conductive structural adhesive from overflowing into the explosion-proof valve area.

[0016] In one optional embodiment, the distance L1 between the edge of the small hole and the edge of the explosion-proof valve satisfies L1≥2mm.

[0017] Beneficial effects: By reasonably setting the distance L1 between the edge of the small hole and the edge of the explosion-proof valve, sufficient buffer and flow space is reserved for exhaust, ensuring smooth exhaust during thermal runaway of the battery cell and avoiding obstruction of gas exhaust due to insufficient space.

[0018] In one optional embodiment, the thickness L2 of the insulating element is the difference between the large hole and the small hole, and satisfies L2≥1mm.

[0019] Beneficial effects: When the insulating component is installed into the through hole, it fits perfectly into the larger portion of the stepped hole. After installation, it fits snugly against the stepped surface of the hole, ensuring the insulating component is fixed in position within the stepped hole. This provides good support and filling, preventing instability or shaking caused by improper insulation component dimensions. After the insulating component is installed into the through hole, its inner wall is flush with the inner wall of the small hole on the first flow channel plate, creating an unobstructed exhaust channel. This ensures smooth exhaust without hindering the explosion-proof valve's exhaust function.

[0020] In one alternative implementation, the sum of the heights of the pole and the plate is the same as the height of the protrusion; The orthographic projection of the second cooling plate covers the protrusion and the plate.

[0021] Beneficial effect: Setting the height of the protrusion to be the same as the sum of the heights of the electrode post and the electrode plate allows the second cooling plate to be in close contact with both the protrusion and the electrode plate when it is installed on the battery cell, so that the second cooling plate can cool both the protrusion and the electrode plate at the same time.

[0022] By covering the protrusion and the plate with the orthographic projection of the second cooling plate, all areas of the protrusion and the plate can be connected to the second cooling plate through thermally conductive adhesive, so that heat can be directly carried away by the second cooling plate, thereby improving the heat dissipation efficiency of the battery pack and further increasing the charging rate of the battery pack.

[0023] In an alternative embodiment, a cooling pipe is further included for connecting the first cooling plate and the second cooling plate.

[0024] Beneficial effects: Connecting the cooling pipes to the first and second cooling plates respectively makes the first and second cooling plates interconnected, allowing the coolant to flow between the first and second cooling plates through the cooling pipes, so that the heat at the top and bottom of the battery cell can be evenly removed, thereby improving the heat dissipation efficiency of the battery pack.

[0025] Secondly, this utility model also provides an electrical device, including: the battery pack as described above.

[0026] Beneficial effects: Since the electrical equipment includes the aforementioned battery pack, it has the same effects as the battery pack, which will not be elaborated here. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model; Figure 2 for Figure 1 A magnified view of part A in the diagram; Figure 3 for Figure 1 A top view of the battery pack shown; Figure 4 for Figure 3 Cross-sectional view along the middle BB; Figure 5 for Figure 4 A magnified view of part of C; Figure 6 for Figure 1 Another top view of the battery pack shown; Figure 7 for Figure 6 Cross-sectional view along the middle DD; Figure 8 for Figure 7 A magnified view of part of E in the diagram.

[0029] Explanation of reference numerals in the attached figures: 100, First cooling plate; 110, First connecting hole; 120, Through hole; 121, Stepped surface; 130, First flat plate; 140, First flow channel plate; 200, Mounting frame; 300, Upper housing; 400, Battery cell; 410, Protrusion; 420, Terminal post; 430, Bar plate; 440, Second thermally conductive structural adhesive; 450, Explosion-proof valve; 500, Second cooling plate; 510, Second flat plate; 520, Second flow channel plate; 530, Second flow channel; 600, Cooling pipe; 700, First thermally conductive structural adhesive; 800, Insulating component. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0032] According to embodiments of the present invention, on the one hand, such as Figure 1 , Figure 2 , Figures 6 to 8 As shown, a battery pack is provided, including: a first cooling plate 100 and a mounting frame 200 disposed on the first cooling plate 100 along the Z direction, the mounting frame 200 having interconnected openings at both ends; at least one row of battery cells 400 arranged sequentially along the X direction, mounted in the mounting frame 200, and the battery cells 400 being bonded to the first cooling plate 100; along the Z direction, the top end of the battery cell 400 has a pair of terminals 420, respectively located at both ends of the battery cell 400 along the Y direction, and a tab 430 is provided on the terminal 420; the top end of the battery cell 400 also has a protrusion 410, the protrusion 410 being located between the pair of terminals 420; a second cooling plate 500, bonded to the protrusion 410 and the tab 430; along the Z direction, the bottom end of the battery cell 400 is provided with an explosion-proof valve 450, and the first cooling plate 100 has a through hole 120 corresponding to the explosion-proof valve 450.

[0033] In this embodiment, the X direction is the length direction of the battery pack, the Y direction is the width direction of the battery pack, and the Z direction is the height direction of the battery pack. Along the Z direction, the first cooling plate 100 is located at the lowest end of the battery pack, and the mounting frame 200 serves as the bottom frame of the battery pack, fixedly connected to the first cooling plate 100. The mounting frame 200 can be formed by multiple side plates, providing a receiving space within it, allowing the battery cell 400 to be installed within the receiving space. Along the Z direction, the upper and lower ends of the mounting frame 200 have interconnected openings, allowing the battery cell 400 to be installed into the mounting frame 200 through the upper opening and bonded to the first cooling plate 100 through the lower opening. Along the X direction, at least one row of sequentially arranged battery cells 400 forms a battery cell module, which is further installed into the receiving space. Furthermore, the mounting frame 200 also includes partitions for dividing the accommodating spaces, thereby forming multiple sub-accommodating spaces within the mounting frame 200 to facilitate the installation of more cell modules. When there are multiple cell modules, the multiple cell modules are connected in series, parallel, or mixed via busbar components to form a battery pack.

[0034] Each cell 400 has two terminals 420 at its top, namely a positive terminal and a negative terminal, which are respectively located at both ends of the cell 400 along the Y direction to facilitate current output. A switch 430 is provided on both the positive and negative terminals, allowing the switch 430 to connect the positive and negative terminals of multiple cells 400 to form a complete circuit.

[0035] A protrusion 410 is provided at the top of the battery cell 400, located between the two terminals 420. The protrusion 410 provides support and a thermally conductive contact point for the subsequent installation of the second cooling plate 500. A second thermally conductive structural adhesive 440 is coated on the top of both the protrusion 410 and the electrode 430. The second cooling plate 500 is bonded and fixed to the top of the battery cell 400 by the second thermally conductive structural adhesive 440, and directly contacts the protrusion 410 and the electrode 430. The second thermally conductive structural adhesive 440 can transfer heat from the terminals 420 and the electrode 430 to the second cooling plate 500. The second cooling plate 500 then absorbs the heat transferred by the second thermally conductive structural adhesive 440 and transfers the heat to other locations.

[0036] By setting a first cooling plate 100 at the bottom of the battery pack and bonding the battery cell 400 to the first cooling plate 100, the first cooling plate 100 can directly dissipate the basic heat generated by the battery cell 400 during operation and charging. At the same time, a second cooling plate 500 is set at the top of the plate 430 and the protrusion 410, so that the second cooling plate 500 is in the upper space of the battery pack and can cool the upper part of the plate 430, the terminal post 420 and the battery cell 400, increasing the heat dissipation area of ​​the battery cell 400, reducing the temperature rise of the battery cell 400, plate 430 and terminal post 420, thereby improving the fast charging rate and enhancing the safety performance of the battery pack.

[0037] Along the Z-direction, an explosion-proof valve 450 is provided at the bottom of the battery cell 400. When a large amount of gas is generated inside the battery cell 400 due to overheating, short circuit, or other problems, the explosion-proof valve 450 can rupture and release gas in time, preventing the battery cell 400 from exploding. Moreover, by placing the explosion-proof valve 450 at the bottom of the battery cell 400, when the explosion-proof valve 450 is opened, the ejected material at the explosion-proof valve 450 will not splash onto the electrode plate 430 and the terminal post 420, reducing the risk of thermal runaway propagation. Furthermore, a through hole 120 is provided on the first cooling plate 100 at a position corresponding to the explosion-proof valve 450, allowing the exhaust direction of the explosion-proof valve 450 to be completely unobstructed and not blocked by the cooling plate. The through hole 120 is slightly larger than the explosion-proof valve 450 to ensure unobstructed exhaust, without designing the through hole 120 to be too large, thus avoiding excessive weakening of the structural strength of the first cooling plate 100.

[0038] Furthermore, the battery cell 400 is formed by assembling a battery cell housing, a battery cell cover plate, and an electrode assembly. The battery cell housing has a receiving cavity and an opening communicating with the receiving cavity, through which the electrode assembly is installed into the receiving cavity. The battery cell cover plate is installed on the opening of the battery cell housing, serving to fix and seal, thereby enclosing the internal components such as the electrode assembly within the battery cell housing to prevent the entry of external impurities and moisture, while also preventing leakage of the internal electrolyte, providing a stable working environment for the battery cell 400. The electrode post 420 is disposed in the mounting hole on the battery cell cover plate and is electrically connected to the electrode tab on the electrode assembly. Along the Z direction, an explosion-proof valve 450 is disposed on the battery cell housing and located at the bottom of the battery cell housing. By placing the explosion-proof valve 450 at the bottom of the cell housing, when the explosion-proof valve 450 of the cell 400 is opened, the ejected material at the explosion-proof valve 450 is discharged downward through the bottom explosion-proof valve 450, directly away from the cell module and the electrical components on the top of the battery pack, so that the ejected material will not splash onto the plate 430 and the terminal post 420, reducing the risk of thermal runaway propagation.

[0039] Furthermore, the protrusion 410 is disposed on the cell cover plate, extending upward from the upper surface of the cell cover plate along the Z direction, and covering the entire cell cover plate along the Y direction. During the charging or use of the cell 400, the heat generated by the electrode assembly can be transferred to the cell cover plate, the terminal post 420 and the electrode plate 430, and further transferred to the second cooling plate 500 connected to the protrusion 410, the terminal post 420 and the electrode plate 430. The second cooling plate 500 then dissipates the heat, thereby cooling the electrode plate 430, the terminal post 420 and the upper part of the cell 400, reducing the temperature rise of the cell 400, the electrode plate 430 and the terminal post 420.

[0040] like Figures 3 to 5 As shown, in one embodiment, the sum of the heights of the pole post 420 and the plate 430 is the same as the height of the protrusion 410; the orthographic projection of the second cooling plate 500 covers the protrusion 410 and the plate 430.

[0041] In this embodiment, the height of the protrusion 410 is set to be the same as the sum of the heights of the electrode post 420 and the electrode plate 430. This allows the second cooling plate 500 to simultaneously adhere to both the protrusion 410 and the electrode plate 430 when it is mounted on the battery cell 400, thus enabling the second cooling plate 500 to cool both simultaneously. Furthermore, if the protrusion 410 is too high, the second cooling plate 500 will be pushed up, resulting in a gap between the second cooling plate 500 and the electrode plate 430, preventing effective contact. This would prevent heat from the electrode plate 430 and the electrode post 420 from being transferred to the second cooling plate 500, causing localized temperature increases. Additionally, uneven stress on the second cooling plate 500 may lead to cracking after prolonged use. If the terminal post 420 and the plate 430 are too high, the second cooling plate 500 will be pushed up by the plate 430, creating a gap between the second cooling plate 500 and the protrusion 410. This will also affect the fit, making it impossible for the heat of the cell 400 to be effectively dissipated, resulting in an increase in the overall temperature of the cell 400, which will affect the charging rate and safety performance of the battery pack.

[0042] When viewed from the Z direction downwards, the projection range of the second cooling plate 500 includes the projections of the protrusion 410 and the plate 430, so that the second cooling plate 500 can fully contact the protrusion 410 and the plate 430 through the second thermally conductive structural adhesive 440, thereby increasing the contact area between the second cooling plate 500 and the protrusion 410 and the plate 430, and thus improving the heat dissipation efficiency of the protrusion 410 and the plate 430.

[0043] If the orthographic projection of the second cooling plate 500 does not cover the protrusion 410 or the tab 430, the uncovered portion will not be able to contact the second cooling plate 500 through the second thermally conductive adhesive 440, preventing heat dissipation. Furthermore, prolonged overheating of certain areas on the protrusion 410 or tab 430 will accelerate their aging and may even lead to decreased cell consistency and thermal runaway. By covering the protrusion 410 and tab 430 with the orthographic projection of the second cooling plate 500, all areas of the protrusion 410 and tab 430 can be connected to the second cooling plate 500 through the thermally conductive adhesive. This allows heat to be directly carried away by the second cooling plate 500, improving the heat dissipation efficiency of the battery pack and further increasing its charging rate.

[0044] During the application of the first thermally conductive structural adhesive 700, excess adhesive may be generated, causing the explosion-proof valve 450 of the battery cell 400 to be blocked by the first thermally conductive structural adhesive 700. When the battery cell 400 experiences thermal runaway and the explosion-proof valve 450 needs to rupture and release gas, the first thermally conductive structural adhesive 700 may prevent the explosion-proof valve 450 from opening normally or prevent the gas from being released quickly, which may eventually cause the battery cell 400 to explode, making the safety function of the explosion-proof valve 450 completely fail.

[0045] In one embodiment, it also includes a first thermally conductive structural adhesive 700 located between the battery cell 400 and the first cooling plate 100, the battery cell 400 and the first cooling plate 100 being bonded together by the first thermally conductive structural adhesive 700; and an insulating member 800 installed in the through hole 120, the upper surface of the insulating member 800 being on the same plane as the upper surface of the first thermally conductive structural adhesive 700.

[0046] In this embodiment, the first thermally conductive structural adhesive 700 is located between the battery cell 400 and the first cooling plate 100, so that the bottom of the battery cell 400 is bonded to the first cooling plate 100 through the first thermally conductive structural adhesive 700, allowing the heat generated by the battery cell 400 to be directly transferred to the first cooling plate 100, thereby facilitating heat dissipation at the bottom of the battery cell 400. An insulating member 800 is disposed inside the through hole 120, such that the side of the insulating member 800 away from the explosion-proof valve 450 is in contact with the first cooling plate 100 and the first thermally conductive structural adhesive 700, and the upper surface of the insulating member 800 is flush with the upper surface of the first thermally conductive structural adhesive 700.

[0047] When the first thermally conductive structural adhesive 700 is applied, it fills the gap between the bottom of the battery cell 400 and the first cooling plate 100. When the adhesive reaches the edge of the first cooling plate 100, the insulating component 800 prevents the first thermally conductive structural adhesive 700 from overflowing, thus preventing it from flowing further towards the central explosion-proof valve 450 area. Furthermore, the upper surface of the insulating component 800 is flush with the upper surface of the first thermally conductive structural adhesive 700, preventing overflow and ensuring a uniform thickness of the adhesive between the battery cell 400 and the first cooling plate 100. This ensures stable adhesion of the battery cell 400 to the first cooling plate 100 and allows heat to be evenly transferred from the bottom of the battery cell 400 to the first cooling plate 100, preventing localized poor heat conduction. Furthermore, once the explosion-proof valve 450 of the battery cell 400 is opened, the insulating component 800 can prevent the ejected material from directly contacting the first cooling plate 100, further reducing the risk of battery pack insulation failure. In addition, the insulating component 800 is flame-retardant, thereby reducing the risk of battery pack fire.

[0048] By installing the insulating component 800 inside the through hole 120, the first thermally conductive structural adhesive 700 can cover the bottom area of ​​all battery cells 400 except for the explosion-proof valve 450, so as to ensure the adhesion and thermal conductivity of the battery cells 400; at the same time, the height limitation of the insulating component 800 prevents the first thermally conductive structural adhesive 700 from overflowing, thus avoiding the first thermally conductive structural adhesive 700 from covering the explosion-proof valve 450, thereby ensuring safe pressure relief.

[0049] In one embodiment, the first cooling plate 100 includes a first flat plate 130 and a first flow channel plate 140, and the battery cell 400 is bonded to the first flat plate 130; the through hole 120 is a stepped hole with a larger opening at the top and a smaller opening at the bottom, with the larger opening of the stepped hole located on the first flat plate 130 and the smaller opening of the stepped hole located on the first flow channel plate 140; the insulating member 800 matches the larger opening, and the insulating member 800 is installed in the larger opening and abuts against the stepped surface 121 of the stepped opening.

[0050] In this embodiment, the first cooling plate 100 is formed by combining a first flat plate 130 and a first flow channel plate 140. The first flat plate 130 is located on the upper layer and directly contacts the bottom of the battery cell 400. The first flat plate 130 provides a flat bonding surface, allowing the battery cell 400 to be stably adhered to it, thus ensuring the fixation of the battery cell 400 and the transfer of heat from the bottom of the battery cell 400. The first flow channel plate 140 is located on the lower layer and is attached to the first flat plate 130. The first flow channel plate 140 has multiple protrusions, creating a certain height between the upper and lower surfaces of the first flow channel plate 140, thereby forming a first flow channel between the first flow channel plate 140 and the first flat plate 130. Coolant can flow within the first flow channel to absorb the heat from the battery cell 400 transferred from the first flat plate 130, thus achieving heat dissipation from the bottom of the battery cell 400. The through hole 120 is positioned away from the first flow channel, so that the through hole 120 does not damage the structure of the first flow channel, thus ensuring the normal flow of coolant, not affecting heat dissipation efficiency, and preventing leakage from the first cooling plate 100.

[0051] On the first cooling plate 100, the through hole 120 is a stepped hole, larger at the top and smaller at the bottom. The larger hole of the stepped hole is on the first flat plate 130, and the smaller hole is on the first flow channel plate 140, so that the edge of the first flow channel plate 140 extends beyond the edge of the first flat plate 130, thus forming a stepped through hole 120. The size of the insulating member 800 is perfectly matched with the larger hole, and when the insulating member 800 is installed in the through hole 120, the insulating member 800 abuts against the stepped surface 121 of the stepped hole, that is, the insulating member 800 contacts the upper surface of the first flow channel plate 140, so that the insulating member 800 is directly placed on the first flow channel plate 140. When the insulating component 800 is installed in the through hole 120, the stepped hole, which is larger at the top and smaller at the bottom, makes it easier to accurately place the insulating component 800 in place, thereby fixing the insulating component 800 in the through hole 120, improving the stability of the installation of the insulating component 800, and effectively preventing the first thermally conductive structural adhesive 700 from overflowing into the explosion-proof valve 450 area.

[0052] In one embodiment, the distance L1 between the edge of the orifice and the edge of the explosion-proof valve 450 satisfies L1≥2mm.

[0053] In this embodiment, the distance L1 between the edge of the orifice and the edge of the explosion-proof valve 450 can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc., and can be set according to actual usage requirements. By reasonably setting the distance L1 between the edge of the orifice and the edge of the explosion-proof valve 450, sufficient buffer and flow space is reserved for exhaust, ensuring smooth exhaust during thermal runaway of the battery cell 400 and avoiding obstruction of gas exhaust due to insufficient space. If L1 < 2mm, the edge of the orifice is too close to the edge of the explosion-proof valve 450, causing the gas to be restricted by the edge of the orifice as soon as it is ejected from the explosion-proof valve 450, resulting in the gas not being able to be discharged smoothly. This weakens the pressure relief effect of the explosion-proof valve 450, and may cause the battery cell casing to rupture due to excessive pressure before the gas is completely discharged, thus triggering more serious thermal runaway.

[0054] In one embodiment, the thickness L2 of the insulating element 800 is the difference between the large hole and the small hole, and satisfies L2≥1mm.

[0055] In this embodiment, the thickness L2 of the insulating component 800 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc., and can be set according to actual usage requirements. The thickness of the insulating component 800 is determined by the difference between the large hole and the small hole, ensuring that the thickness of the insulating component 800 is equal to the difference between the large hole and the small hole. When the insulating component 800 is installed into the through hole 120, it fits perfectly into the large hole portion of the stepped hole. After installation, it can tightly abut against the stepped surface 121 of the stepped hole, thereby ensuring that the position of the insulating component 800 is fixed in the stepped hole, providing good support and filling, and preventing unstable installation or shaking due to unsuitable dimensions of the insulating component 800. After the insulating component 800 is installed into the through hole 120, the inner wall of the insulating component 800 is flush with the inner wall of the small hole on the first flow channel plate 140, so that the insulating component 800 and the small hole form an unobstructed exhaust channel, thus not hindering the exhaust function of the explosion-proof valve 450 and ensuring smooth exhaust.

[0056] In one embodiment, a cooling pipe 600 is also included for connecting the first cooling plate 100 and the second cooling plate 500.

[0057] In this embodiment, the second cooling plate 500 is formed by combining a second flat plate 510 and a second flow channel plate 520. The second flat plate 510 is located on the lower layer and directly contacts the protrusion 410 and the tab 430 of the battery cell 400. The second flat plate 510 provides a flat bonding surface, allowing the second cooling plate 500 to be stably bonded to the battery cell 400, thereby ensuring the fixation of the battery cell 400 and the transfer of heat from the upper part of the battery cell 400. The second flow channel plate 520 is located on the upper layer and is attached to the second flat plate 510. The second flow channel plate 520 has multiple protrusions, which create a certain height between the upper and lower surfaces of the second flow channel plate 520, thereby forming a second flow channel 530 between the second flow channel plate 520 and the second plate 510. Coolant can flow in the second flow channel 530 to absorb the heat of the battery cell 400 transferred from the second plate 510, thereby achieving heat dissipation of the upper part of the battery cell 400, the electrode plate 430, and the terminal post 420. This simultaneously cools the bottom and top of the battery cell 400, as well as the terminal post 420 and the electrode plate 430. A first connecting hole 110 is provided on the upper surface of the first cooling plate 100, and a second connecting hole is provided on the lower surface of the second cooling plate 500. One end of the cooling pipe 600 is connected to the first connecting hole 110, and the other end is connected to the second connecting hole, so that the first cooling plate 100 and the second cooling plate 500 are connected. This allows the coolant to flow between the first cooling plate 100 and the second cooling plate 500 through the cooling pipe 600, so that the heat at both ends of the battery cell 400 can be evenly removed, thereby improving the heat dissipation efficiency of the battery pack.

[0058] In one embodiment, an upper housing 300 is also included, which is mounted on the mounting frame 200 and cooperates with the mounting frame 200 and the first cooling plate 100 to form a sealed space.

[0059] In this embodiment, the upper housing 300 is mounted on the mounting frame 200, so that the upper housing 300, the mounting frame 200, and the first cooling plate 100 cooperate to form a sealed space, creating a comprehensive protective barrier for the core components inside the battery pack, such as the cells 400, terminals 420, and contact plates 430. It also provides structural support for the entire battery pack, ensuring its safe and stable operation in complex environments. For example, it isolates rainwater and road surface water, preventing liquid contact with conductive components such as the cells 400 and terminals 420, thus preventing short circuits or component corrosion. It also blocks dust, sand, and foreign objects such as stones that may be splashed during driving, preventing them from getting stuck in the gaps between the cells 400 or abrading the contact plates 430 and terminals 420, affecting circuit connections or heat dissipation. Furthermore, the upper housing 300 itself has a certain strength, and the rigid frame formed by the mounting frame 200 and the first cooling plate 100 provides cushioning and support for internal components when subjected to minor collisions or pressure, reducing direct impact damage.

[0060] According to an embodiment of the present invention, another aspect provides an electrical device including a battery pack. The technical solutions described in the embodiments of the present invention are applicable to various electrical devices using battery packs.

[0061] Electrical equipment can be vehicles, ships, spacecraft, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. This utility model embodiment does not impose any special limitations on the above-mentioned electrical equipment.

[0062] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of the present invention.

[0063] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery pack is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery pack to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this invention, the battery pack can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving force for the vehicle.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: A first cooling plate and a mounting frame disposed on the first cooling plate along the Z direction, wherein the two ends of the mounting frame have interconnected openings. At least one column of battery cells arranged sequentially along the X direction is installed in the mounting frame, and the battery cells are bonded to the first cooling plate; Along the Z direction, the top of the battery cell has a pair of terminals, located at both ends of the battery cell along the Y direction, and a tab is provided on the terminals; the top of the battery cell also has a protrusion, which is located between the pair of terminals; The second cooling plate is bonded to the protrusion and the plate. Along the Z direction, an explosion-proof valve is provided at the bottom of the battery cell, and a through hole corresponding to the explosion-proof valve is provided on the first cooling plate.

2. The battery pack according to claim 1, characterized in that, The battery cell includes a battery cell housing, the battery cell housing having a receiving cavity and an opening communicating with the receiving cavity; The electrode assembly is installed within the receiving cavity; A cell cover plate is installed at the opening to seal the opening; Along the Z-direction, the explosion-proof valve is located at the bottom of the cell housing.

3. The battery pack according to claim 2, characterized in that, The protrusion is located on the cell cover plate and extends upward from the upper surface of the cell cover plate along the Z direction.

4. The battery pack according to claim 1, characterized in that, It also includes a first thermally conductive structural adhesive, located between the battery cell and the first cooling plate, wherein the battery cell and the first cooling plate are bonded together by the first thermally conductive structural adhesive; An insulating component is installed inside the through hole, and the upper surface of the insulating component is located on the same plane as the upper surface of the first thermally conductive structural adhesive.

5. The battery pack according to claim 4, characterized in that, The first cooling plate includes a first flat plate and a first flow channel plate, and the battery cell is bonded to the first flat plate; the through hole is a stepped hole with a larger opening at the top and a smaller opening at the bottom, with the larger opening of the stepped hole located on the first flat plate and the smaller opening of the stepped hole located on the first flow channel plate; the insulating component matches the larger opening, and the insulating component is installed in the larger opening and abuts against the stepped surface of the stepped opening.

6. The battery pack according to claim 5, characterized in that, The distance L1 between the edge of the small hole and the edge of the explosion-proof valve satisfies L1≥2mm.

7. The battery pack according to claim 5, characterized in that, The thickness L2 of the insulating component is the difference between the large hole and the small hole, and L2 ≥ 1 mm.

8. The battery pack according to claim 1, characterized in that, The sum of the heights of the pole and the plate is the same as the height of the protrusion; The orthographic projection of the second cooling plate covers the protrusion and the plate.

9. The battery pack according to claim 1, characterized in that, It also includes cooling pipes for connecting the first cooling plate and the second cooling plate.

10. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1 to 9.

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