Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment, the battery pack comprises a battery cell module and a cooling plate, the battery cell module comprises a plurality of battery cells and a pressure release valve, each battery cell comprises a battery cell top and a battery cell bottom, the battery cell top is provided with a pole, the cooling plate is located at the battery cell bottom, and the pressure release valve is arranged at the battery cell top and located at one side of the pole. The pressure release valve is arranged at the top of the battery cell module, and the cooling plate is arranged at the bottom of the battery cell module, so that top pressure release and bottom cooling are realized; according to the top pressure relief, a top space formed after the battery pack is assembled can be used as a pressure relief cavity, the space in the extending direction (Z direction) of the battery cell is not additionally occupied, and the space utilization rate of the battery pack in the Z direction can be improved; and the bottom is cooled, so that the requirement on the battery cell spacing is not high, the battery cell spacing can be further reduced, and the space utilization rate of the battery pack in the radial direction (X direction) of the battery cells can be improved so as to be matched with different vehicle types.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery packs and electrical equipment. Background Art

[0002] Currently, large cylindrical liquid cooling generally uses side-mounted liquid cooling, but this has a lower limit on the thickness of the side cooling plates, preventing cell spacing from being reduced and resulting in significant space waste. Most large cylindrical pressure relief systems use bottom-mounted pressure relief, which allows for gas and electricity separation but requires significant space at the bottom, resulting in low cell height utilization and making it unsuitable for many vehicle models. Summary of the Invention

[0003] The embodiments of the present application provide a battery pack and electrical equipment that can release pressure through the top and cool through the bottom, thereby improving space utilization to match different vehicle models.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, comprising:

[0005] A battery cell module, comprising a plurality of battery cells and a pressure relief valve; the battery cell comprises a battery cell top and a battery cell bottom, and the battery cell top has a pole;

[0006] a cooling plate located at the bottom of the battery cell; and

[0007] The pressure relief valve is arranged on the top of the battery cell and located on one side of the pole.

[0008] In some embodiments of the present application, the battery pack further includes a thermally conductive structural adhesive, and the thermally conductive structural adhesive is located between the cooling plate and the bottom of the battery cell of the battery cell module.

[0009] In some embodiments of the present application, the bonding force between the thermally conductive structural adhesive, the battery cell, and the cooling plate depends on the parameters σ1, σ2, S1, S2, d1, k0, γ, and λ. d , S and α; the σ1, the σ2, the S1, the S2, the d1, the k0, the γ, the λ d , said S and said α satisfy:

[0010] 0.5MPa≤σ1≤10MPa; and / or

[0011] 3MPa≤σ2≤10MPa; and / or

[0012] S1=(0.7~1.0)*S;and / or

[0013] S2=(0.9~1.0)*S;and / or

[0014] 0.3mm≤d1≤3.0mm; and / or

[0015] 1.0W / mk≤k0≤3.0W / mk; and / or

[0016] 1.0≤γ≤3.0; and / or

[0017] 1.5≤λ d ≤3.0; and / or

[0018] 0.2≤α≤0.8;

[0019] Among them, σ1 refers to the bonding stress between the bottom of the battery cell and the thermally conductive structural adhesive, σ2 refers to the bonding stress between the cooling plate and the thermally conductive structural adhesive, S1 refers to the bonding area of ​​the bottom of the battery cell, S2 refers to the bonding area of ​​the cooling plate, d1 refers to the thickness of the thermally conductive structural adhesive in the extension direction of the battery cell, k0 refers to the thermal conductivity of the thermally conductive structural adhesive, γ refers to the area correction system, λ d refers to the stress relaxation time constant, α refers to the failure risk correction factor; S is the area of ​​the bottom of the battery cell.

[0020] In some embodiments of the present application, the σ1, the σ2, the S1, the S2, the d1, the k0, the γ, the λ d , the S and the α satisfy the following function:

[0021]

[0022] Where f(x) is a preset value.

[0023] In some embodiments of the present application, the battery pack further includes a case and an adhesive, the battery cell module is located in the case, and the adhesive is filled between the case and the battery cell and in the gaps between adjacent battery cells.

[0024] In some embodiments of the present application, the bonding force between the adhesive, the battery cell, and the box depends on parameters σ3, σ4, d, S3, S4, and S5; σ3, σ4, d, S3, S4, and S5 satisfy:

[0025] 0.5MPa≤σ3≤6MPa; and / or

[0026] 1MPa≤σ4≤6MPa; and / or

[0027] S3=(0.9~1.0)*S5;and / or

[0028] S4=(0.8~1.0)*S5;and / or

[0029] 3mm≤d≤25mm;

[0030] Among them, S3 refers to the bonding area between the side of the battery cell and the adhesive; σ3 refers to the bonding strength between the side of the battery cell and the adhesive; d refers to the thickness of the adhesive in the extension direction of the battery cell; S4 refers to the bonding area between the box and the adhesive; σ4 refers to the bonding strength between the box and the adhesive, and S5 is the side area of ​​the battery cell.

[0031] In some embodiments of the present application, the σ3, the σ4, the d, the S3, the S4, and the S5 satisfy the following function:

[0032]

[0033] Among them, g(x) is the preset value.

[0034] In some embodiments of the present application, the battery pack further includes a first pressure relief channel, which is spaced apart from and insulated from the pole; when the pressure relief valve is opened, the first pressure relief channel is connected to the interior of the battery cell through the pressure relief valve.

[0035] In some embodiments of the present application, the battery pack further includes an insulating layer, which is located on one side of the pole of the battery cell and contacts the end of the first pressure relief channel away from the pressure relief valve and the pole. When the pressure relief valve is opened, the thermal runaway material rushing out of the first pressure relief channel can break through the insulating layer.

[0036] In some embodiments of the present application, the battery pack further includes a cover plate, the cover plate is located on one side of the pole of the battery cell, and the insulating layer is located between the cover plate and the battery cell module.

[0037] In some embodiments of the present application, a second pressure relief channel is further provided between the cover plate and the insulating layer. When the pressure relief valve is opened, the second pressure relief channel is connected to the first pressure relief channel.

[0038] In some embodiments of the present application, the battery pack further includes an explosion-proof valve and a box body, the explosion-proof valve is arranged on the cover plate or the box body, and the explosion-proof valve is connected to the second pressure relief channel.

[0039] In some embodiments of the present application, the battery pack further includes a bottom protective plate, which is located on a side of the cooling plate away from the battery cell module and is connected to the box.

[0040] In some embodiments of the present application, the battery pack further includes a cooling medium inlet and a cooling medium outlet, and the cooling medium inlet and the cooling medium outlet are both provided on the cooling plate;

[0041] The cooling plate has a cooling channel, and the cooling medium inlet and the cooling medium outlet are respectively communicated with the cooling channel.

[0042] In some embodiments of the present application, the battery pack further includes a CCS assembly, and the CCS assembly is located between the insulating layer and the battery cell module.

[0043] In a second aspect, the present application also provides an electrical device, which includes the battery pack as described above.

[0044] The embodiments of the present application provide a battery pack and an electrical device, wherein the battery pack includes a cell module and a cooling plate, the cell module includes a plurality of cells and a pressure relief valve, the cell includes a cell top and a cell bottom, the cell top has a pole, the cooling plate is located at the cell bottom, and the pressure relief valve is located at the cell top and on one side of the pole. The present application can achieve top pressure relief and bottom cooling by setting the pressure relief valve at the top of the cell module and by setting the cooling plate at the bottom of the cell module; the top pressure relief can use the top space formed after the battery pack is assembled as a pressure relief chamber, without occupying additional space in the extension direction (Z direction) of the cell, and can improve the space utilization of the battery pack in the Z direction; the bottom cooling does not require high cell spacing, and can further reduce the cell spacing, thereby improving the space utilization of the battery pack in the radial direction (X direction) of the cell; in this way, the battery pack of the present application can match different vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 It is a three-dimensional schematic diagram of a battery pack provided in some embodiments of the present application.

[0047] Figure 2 for Figure 1 An exploded view of the battery pack is shown.

[0048] Figure 3 for Figure 1 Partial cross-sectional view of the battery pack shown (without the case, cover, and bottom guard).

[0049] Figure 4 for Figure 1 A partial cross-sectional view of the battery pack (with casing) shown.

[0050] Figure 5Schematic diagram of the modules of the electrical equipment provided for this application.

[0051] Description of reference numerals:

[0052] 1000. Electrical equipment; 100. Battery pack; 10. Casing; 20. Cell module; 21. Cell; 211. Cell top; 212. Cell bottom; 213. Pole; 214. Cell body; 30. Cooling plate; 31. Cooling medium inlet; 32. Cooling medium outlet; 33. First pipeline; 34. Second pipeline; 40. Pressure relief valve; 41. First pressure relief channel; 42. Second pressure relief channel; 51. Thermal conductive structural adhesive; 52. Adhesive; 53. Bottom guard plate; 54. Buffer; 61. Cover; 62. Insulation layer; 63. Explosion-proof valve; 71. CCS assembly. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0054] Related technologies for large cylindrical liquid cooling generally use side-mounted liquid cooling solutions. This has a lower limit on the thickness of the side cooling plates, preventing cell spacing from being reduced and resulting in significant space waste. Mainstream large cylindrical pressure relief methods all use bottom-mounted pressure relief. While this allows for gas and electricity separation, it requires significant space at the bottom, resulting in low space utilization in the cell's height, making it unsuitable for many vehicle models.

[0055] To improve the above problems, first, please refer to Figures 1 to 4 An embodiment of the present application provides a battery pack 100, which includes a battery cell module 20 and a cooling plate 30. The battery cell module 20 includes multiple battery cells 21 and a pressure relief valve 40. The battery cell 21 includes a battery cell top 211 and a battery cell bottom 212. The battery cell top 211 has a pole 213; the cooling plate 30 is located at the battery cell bottom 212, and the pressure relief valve 40 is arranged at the battery cell top 211 and on one side of the pole 213.

[0056] The present application can achieve top pressure relief and bottom cooling by arranging the pressure relief valve 40 at the top of the battery cell module 20 and by arranging the cooling plate 30 at the bottom of the battery cell module 20; the top pressure relief can utilize the top space formed after the battery pack 100 is assembled as a pressure relief chamber, without occupying additional space in the extension direction (Z direction) of the battery cell, and can improve the space utilization of the battery pack 100 in the Z direction; the bottom cooling does not have high requirements on the battery cell spacing, and the battery cell spacing can be further reduced, thereby improving the space utilization of the battery pack 100 in the radial direction (X direction) of the battery cell 21; in this way, the battery pack 100 of the present application can match different vehicle models.

[0057] In some embodiments of the present application, the cooling plate 30 is a liquid cooling plate, which actively regulates the battery temperature through the circulation of coolant to address the risk of thermal runaway caused by high-power charging and discharging.

[0058] In some embodiments of the present application, the cooling medium is water, ethylene glycol solution, 3M fluorinated liquid, etc.

[0059] The pressure relief valve 40 is designed to quickly release internal pressure in the event of thermal runaway or overcharge, preventing battery explosion or rupture. It automatically opens when the internal pressure exceeds a threshold (e.g., 20-50 kPa). When the electrolyte decomposes and produces gas or heat spreads, it releases high-temperature gas / flame in a targeted manner, slowing the chain reaction. Compared to a bursting disc (which opens once), the reusable pressure relief valve 40 is more suitable for long-term safety needs.

[0060] Among them, the pressure relief valve 40 includes a mechanical pressure relief valve 40, a heat-triggered pressure relief valve 40 (with a built-in low-melting-point alloy (such as a bismuth-based alloy), which melts and opens when the temperature exceeds a threshold (such as 120°C)), an intelligent active pressure relief valve 40 (controls the solenoid valve through BMS signals, etc. to achieve precise pressure relief), etc.

[0061] In some embodiments of the present application, the battery pack 100 further includes a thermally conductive structural adhesive 51, which is located between the cooling plate 30 and the bottom 212 of the battery cell of the battery cell module 20. In the present application, the thermally conductive structural adhesive 51 is used to directly bond the cooling plate 30 and the battery cell module 20, which has good adhesion and is easy to assemble. It can not only fix the battery cell and the cooling plate 30, but also quickly transfer the heat generated by the battery cell to the cooling plate 30 to avoid local overheating.

[0062] In some embodiments of the present application, the thermally conductive structural adhesive 51 can be silicone thermally conductive adhesive, epoxy resin thermally conductive adhesive, polyurethane thermally conductive adhesive, acrylate thermally conductive adhesive, etc.

[0063] In some embodiments of the present application, the bonding force between the thermal conductive structural adhesive 51, the battery cell 21 and the cooling plate 30 depends on the parameters σ1, σ2, S1, S2, d1, k0, γ, λ d , S and α; the σ1, the σ2, the S1, the S2, the d1, the k0, the γ, the λ d , said S and said α satisfy:

[0064] 0.5MPa≤σ1≤10MPa; and / or

[0065] 3MPa≤σ2≤10MPa; and / or

[0066] S1=(0.7~1.0)*S;and / or

[0067] S2=(0.9~1.0)*S;and / or

[0068] 0.3mm≤d1≤3.0mm; and / or

[0069] 1.0W / mk≤k0≤3.0W / mk; and / or

[0070] 1.0≤γ≤3.0; and / or

[0071] 1.5≤λ d ≤3.0; and / or

[0072] 0.2≤α≤0.8;

[0073] Wherein, σ1 refers to the bonding stress between the bottom 212 of the battery cell and the thermally conductive structural adhesive 51, σ2 refers to the bonding stress between the cooling plate 30 and the thermally conductive structural adhesive 51, S1 refers to the bonding area of ​​the bottom 212 of the battery cell, S2 refers to the bonding area of ​​the cooling plate 30, d1 refers to the thickness of the thermally conductive structural adhesive 51 in the extension direction of the battery cell 21, k0 refers to the thermal conductivity of the thermally conductive structural adhesive 51, γ refers to the area correction system (power function system), λ d is the stress relaxation time constant, and α is the failure risk correction factor.

[0074] In some embodiments of the present application, the σ1, the σ2, the S1, the S2, the d1, the k0, the γ, the λ d , the S and the α satisfy the following function:

[0075]

[0076] Where f(x) is a preset value.

[0077] Among them, in the f(x) function, σ2 exists in both the numerator and denominator of the exponential of e. It is not deleted when designing f(x) in order to illustrate that the numerator of the exponential of e depends on the product of α, σ1 and σ2, and the denominator of the exponential of e depends on the product of S2 and σ2.

[0078] In some embodiments of the present application, the value range of f(x) is [0.206, 3092206407.4] for a cell with a diameter of 18 mm, S = 3.14 × 9 × 9. Substituting other parameters, the calculated range of f(x) is [0.206, 3092206407.4]. f(x) is a set range that meets the above range. The specific value of f(x) needs to be adjusted according to the actual needs of the project. For example, it can be (0.5-50), (1-100), (0.3-1000), (0.4-1500), (0.21-2000), (1-5000), (0.3-6000), (0.4-8500), (0.21-10000), (0.3-5000), (0.4-8000), (0.5-100000), etc. For a cell with a diameter of 46 mm, S = 3.14 × 23 × 23. Substituting other parameters, the calculated range of f(x) is [1.397, 869146480570.37]. The specific value of f(x) is adjusted according to the actual project needs, for example, (1.4-50), (2-100), (1.5-1000), (2-2000), (1.4-5000), (1.5-8000), (4-9000), (1.45-10000), (1.5-30000), (1.5-50000), (1.5-100000), etc.

[0079] The present application quantifies the influencing factors affecting the bonding force between the thermally conductive structural adhesive 51, the battery cell 21 and the cooling plate 30 and designs a function f(x) with the above influencing factors, so that the bonding force between the thermally conductive structural adhesive 51, the battery cell 21 and the cooling plate 30 can be calculated more intuitively. Then, by changing a certain variable of the function f(x), the numerical value of the bonding force between the thermally conductive structural adhesive 51, the battery cell 21 and the cooling plate 30 can be obtained more intuitively to ensure that the thermally conductive structural adhesive 51, the battery cell 21 and the cooling plate 30 have appropriate bonding force while preventing the battery cell 21 from being squeezed and impacted from the bottom.

[0080] In some embodiments of the present application, the battery pack 100 further includes a box 10 and an adhesive 52 , the battery cell module 20 is located in the box 10 , and the adhesive 52 is filled between the box 10 and the battery cell 21 and in the gaps between adjacent battery cells 21 .

[0081] The present application fills the gap between the box 10 and the battery cell 21 and between adjacent battery cells 21 with adhesive 52, that is, the side of the battery cell 21 is bonded to another battery cell 21 or the box 10 with adhesive 52, which not only increases the fixing adhesion of the battery cell 21, but also plays a certain buffering role when it is impacted, thereby enhancing the side anti-extrusion ability of the battery cell 21.

[0082] In some embodiments of the present application, the adhesive 52 is foam glue, potting glue, etc. In this embodiment, the adhesive 52 is foam glue.

[0083] In some embodiments of the present application, the bonding force between the adhesive 52, the battery cell 21 and the box 10 depends on the parameters σ3, σ4, d, S3, S4 and S5; the σ3, the σ4, the d, the S3, the S4 and the S5 satisfy:

[0084] 0.5MPa≤σ3≤6MPa; and / or

[0085] 1MPa≤σ4≤6MPa; and / or

[0086] S3=(0.9~1.0)*S5;and / or

[0087] S4=(0.8~1.0)*S5;and / or

[0088] 3mm≤d≤25mm;

[0089] Among them, S3 refers to the bonding area between the side of the battery cell 21 and the adhesive 52; σ3 refers to the bonding force between the side of the battery cell 21 and the adhesive 52; d refers to the thickness of the adhesive 52 in the extension direction of the battery cell 21; S4 refers to the bonding area between the box body 10 and the adhesive 52; σ4 refers to the bonding force between the box body 10 and the adhesive 52.

[0090] In some embodiments of the present application, the σ3, the σ4, the d, the S3, the S4, and the S5 satisfy the following function:

[0091]

[0092] Among them, g(x) is the preset value.

[0093] In some embodiments of the present application, for a battery cell with a diameter of 18 mm and a height of 65 mm, S5 = 3.14 × 18 × 65. Substituting other parameters, the value range of g(x) is [1760.91, 5.48 × 10^15]; for a battery cell with a diameter of 46 mm and a height of 80 mm, S5 = 3.14 × 46 × 80. Substituting other parameters, the value range of g(x) is [8551.65, 8.40 × 10^16]. For a battery cell with a diameter of 18 mm, the height range is 40 to 80 mm, for example, 65 mm; for a battery cell with a diameter of 46 mm, the height range is 80 to 120 mm, for example, 80 mm, 90 mm, 95 mm, 115 mm, 120 mm, etc. The battery cell 21 can also have other sizes without limitation. f(x) and g(x) are a set range pre-set from the calculated range, that is, a preset value.

[0094] The present application quantifies the factors affecting the bonding force between the adhesive 52, the battery cell and the case 10 and designs a function g(x) with the above-mentioned factors, so that the bonding force between the adhesive 52, the battery cell and the case 10 can be calculated more intuitively. Furthermore, by changing a certain variable of the function g(x), the numerical value of the bonding force between the adhesive 52, the battery cell and the case 10 can be obtained more intuitively, so as to ensure that the adhesive 52, the battery cell and the case 10 have appropriate bonding force while preventing the battery cell 21 from being squeezed and impacted from the side.

[0095] In some embodiments of the present application, the battery pack 100 further includes a cover plate 61, which is located on one side of the battery cell's pole 213. The pressure relief valve 40 is disposed on the cover plate 61. The cover plate 61 can prevent electrolyte leakage and external contaminants from entering the battery pack. The cover plate 61 also integrates an explosion-proof valve or a fuse mechanism to prevent thermal runaway.

[0096] In some embodiments of the present application, the battery pack 100 further includes a first pressure relief channel 41, which is spaced apart from and insulated from the terminal 213. When the pressure relief valve 40 is open, the first pressure relief channel 41 communicates with the interior of the battery cell 21 through the pressure relief valve 40. By providing the first pressure relief channel 41 on one side of the terminal 213, spaced apart from and insulated from the terminal 213, the present application can prevent thermal runaway material that rushes out of the pressure relief valve 40 from affecting the terminal 213 and provide a certain pressure relief path for the thermal runaway material that rushes out of the pressure relief valve 40.

[0097] In some embodiments of the present application, the battery pack 100 further includes an insulating layer 62, which is located on one side of the pole 213 of the battery cell 21 and is in contact with the end of the first pressure relief channel 41 away from the pressure relief valve 40 and the pole 213, respectively. When the pressure relief valve 40 is opened, the thermal runaway material rushing out of the first pressure relief channel 41 can break through the insulating layer 62. The present application further prevents the thermal runaway material rushing out of the first pressure relief channel 41 from affecting the pole 213 by providing the insulating layer 62 on one side of the pole 213, which is in contact with the pole 213 and the end of the first pressure relief channel 41 away from the pressure relief valve 40, respectively.

[0098] In some embodiments of the present application, the battery pack 100 further includes a cover plate 61, which is located on one side of the pole 213 of the battery cell 21, and the insulating layer 62 is located between the cover plate 61 and the battery cell module 20. The cover plate 61 is used to protect the insulating layer 62 and the battery cell 21 (pole 213).

[0099] In some embodiments of the present application, a second pressure relief channel 42 is further provided between the cover plate 61 and the insulating layer 62. When the pressure relief valve 40 is open, the second pressure relief channel 42 communicates with the first pressure relief channel 41. The second pressure relief channel 42 can provide a pressure relief path for thermal runaway substances, thereby reducing the accumulation of thermal runaway substances that could affect battery pack performance.

[0100] In some embodiments of the present application, the battery pack 100 further includes an explosion-proof valve 63, which is disposed on the cover plate 61 or the housing 10 and communicates with the second pressure relief channel 42. The explosion-proof valve 63 is used to guide thermal runaway substances out of the battery pack 100.

[0101] Among them, when thermal runaway occurs and when the pressure relief valve 40 is opened, the thermal runaway material inside the battery cell will rush out from the top 211 of the battery cell into the first pressure relief channel 41, and break through the insulating layer 62 (mica paper, etc.), enter the second pressure relief channel 42, and then be discharged from the box 10 of the battery pack 100 in time through the explosion-proof valve 63. Only the insulating layer 62 (mica paper, etc.) at the position corresponding to the pressure relief valve 40 is damaged, and the insulating layer 62 (mica paper, etc.) at the position corresponding to other battery cells is not damaged. The other battery cells 21 can be protected by the insulating layer 62 (mica paper, etc.).

[0102] In this embodiment, the insulating layer 62 is a mica board. Mica boards provide flame retardancy and thermal insulation, significantly reducing the risk of thermal diffusion within the cell module 20 and improving the safety of the battery pack 100. Furthermore, the mica board can guide the directional discharge of thermal runaway ejecta, preventing damage to surrounding components. Examples of mica boards include natural mica boards, synthetic mica boards (fluorphlogopite), and composite mica boards (mica + base material reinforcement).

[0103] In other embodiments, the insulating layer 62 can also be a ceramic-based material (for example: alumina ceramic sheet, aluminum nitride ceramic, calcium silicate board, etc.), high-performance polymer material (for example: polyimide (PI) film, polyetheretherketone (PEEK), aramid paper (Nomex), etc.), composite material (for example: ceramic fiber board (such as SiO / AlO fiber), mica composite board (mica + glass fiber / carbon fiber), aerogel felt, etc.) and other new materials (for example: hexagonal boron nitride (h-BN) film, graphene coating insulation material, etc.).

[0104] In some embodiments of the present application, the battery pack 100 further includes a CCS (Cell Contacting System) component 71 , and the CCS component 71 is located between the insulating layer 62 and the battery cell module 20 .

[0105] Among them, the CCS component 71 is a key integrated component in the power battery module, responsible for the series / parallel connection, signal acquisition, structural fixation and thermal management of the battery cells 21. The CCS component 71 includes a busbar (or busbar, not shown), a flexible circuit board (not shown), a plastic structural member (not shown), a temperature sensor (not shown), a high-voltage connector (not shown), an insulating protective layer (not shown), etc. The busbar is used for conductive connection between adjacent battery cells (for example: series / parallel connection) and carries high current. The flexible circuit board is used to collect battery cell voltage and temperature signals, etc., and the collected battery cell voltage and temperature signals will be transmitted to the BMS. The plastic structural member is used to fix the busbar and the flexible circuit board to provide insulation and mechanical support for the busbar and the flexible circuit board. The temperature sensor is used to monitor the battery cell temperature to prevent overheating. The high-voltage connector is used as the high-voltage interface between the battery cell module 20 and the external circuit. The insulating protective layer is used to prevent the battery cell 21 from short-circuiting.

[0106] In some embodiments of the present application, the battery pack 100 further includes a cooling medium inlet 31 and a cooling medium outlet 32, both of which are located in the housing 10. The cooling plate 30 has a cooling channel (not shown), with the cooling medium inlet 31 and the cooling medium outlet 32 ​​respectively connected to the cooling channel. The cooling medium flows into the cooling channel through the cooling medium inlet 31 to cool the battery cell 21 at the bottom thereof, and then flows out of the housing 10 of the battery pack 100 through the cooling medium outlet 32.

[0107] In some embodiments of the present application, the cooling medium inlet 31 and the cooling medium outlet 32 ​​are connected to the cooling channel through a first pipeline 33 and a second pipeline 34 respectively.

[0108] In some embodiments of the present application, the battery pack 100 further includes a bottom guard plate 53, which is located on a side of the cooling plate 30 away from the battery cell module 20 and is connected to the box 10 or the cooling plate 30. The bottom guard plate 53 is a key protective structural component at the bottom of the battery pack 100 (or energy storage battery system), primarily used for mechanical protection, sealing and dustproofing, thermal management assistance, and lightweight design.

[0109] In some embodiments of the present application, the battery pack 100 further includes a buffer 54 located between the cooling plate 30 and the bottom guard plate 53. The buffer 54 provides mechanical cushioning, assists in thermal management, and provides sealing and shockproofing. Specifically, the buffer 54 is used to buffer vibration and disperse impact to protect the cooling plate 30; balance thermal conductivity and insulation requirements to optimize thermal management; and provide dust and water resistance, reduce noise, and enhance sealing.

[0110] In this embodiment, the buffer member 54 is foam, which is usually polyurethane foam, silicone foam or rubber foam.

[0111] Second, see Figure 5 , the present application also provides an electric device 1000, which includes the battery pack 100 as described above.

[0112] Among them, the specific structure of the battery pack 100 refers to the above embodiments. Since the electrical equipment 1000 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0113] It is understood that the electrical device 1000 includes, but is not limited to, electric toys, electric tools, battery-powered vehicles, cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Cars may include gasoline-powered cars, gas-powered cars, and new energy vehicles.

[0114] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell module, comprising a plurality of battery cells and a pressure relief valve; the battery cell comprises a battery cell top and a battery cell bottom, and the battery cell top has a pole; and A cooling plate is located at the bottom of the battery cell; Wherein, the pressure relief valve is arranged on the top of the battery cell and located on one side of the pole.

2. The battery pack according to claim 1, wherein: It also includes a heat-conducting structural adhesive, which is located between the cooling plate and the bottom of the battery cell of the battery cell module.

3. The battery pack according to claim 2, wherein: The bonding force between the thermal conductive structural adhesive, the battery cell and the cooling plate depends on the parameters σ1, σ2, S1, S2, d1, k0, γ, and λ d , S and α; the σ1, the σ2, the S1, the S2, the d1, the k0, the γ, the λ d , said S and said α satisfy: 0.5MPa≤σ1≤10MPa; and / or 3MPa≤σ2≤10MPa; and / or S1=(0.7~1.0)*S;and / or S2=(0.9~1.0)*S;and / or 0.3mm≤d1≤3.0mm; and / or 1.0W / mk≤k0≤3.0W / mk; and / or 1.0≤γ≤3.0; and / or 1.5≤λ d ≤3.0; and / or 0.2≤α≤0.8； Among them, σ1 refers to the bonding stress between the bottom of the battery cell and the thermally conductive structural adhesive, σ2 refers to the bonding stress between the cooling plate and the thermally conductive structural adhesive, S1 refers to the bonding area of ​​the bottom of the battery cell, S2 refers to the bonding area of ​​the cooling plate, d1 refers to the thickness of the thermally conductive structural adhesive in the extension direction of the battery cell, k0 refers to the thermal conductivity of the thermally conductive structural adhesive, γ refers to the area correction system, λ d refers to the stress relaxation time constant, α refers to the failure risk correction factor; S is the area of ​​the bottom of the battery cell.

4. The battery pack according to claim 3, wherein: σ1, σ2, S1, S2, d1, k0, γ, and λ d , the S and the α satisfy the following function: Where f(x) is a preset value.

5. The battery pack according to any one of claims 1 to 4, wherein: It also includes a box and an adhesive. The battery cell module is located in the box. The adhesive is filled between the box and the battery cells and in the gaps between adjacent battery cells.

6. The battery pack according to claim 5, wherein: The bonding force between the adhesive, the battery cell and the box depends on parameters σ3, σ4, d, S3, S4 and S5; σ3, σ4, d, S3, S4 and S5 satisfy: 0.5MPa≤σ3≤6MPa; and / or 1MPa≤σ4≤6MPa; and / or S3=(0.9~1.0)*S5;and / or S4=(0.8~1.0)*S5;and / or 3mm≤d≤25mm; Among them, S3 refers to the bonding area between the side of the battery cell and the adhesive; σ3 refers to the bonding strength between the side of the battery cell and the adhesive; d refers to the thickness of the adhesive in the extension direction of the battery cell; S4 refers to the bonding area between the box and the adhesive; σ4 refers to the bonding strength between the box and the adhesive, and S5 is the side area of ​​the battery cell.

7. The battery pack according to claim 6, wherein: The σ3, the σ4, the d, the S3, the S4, and the S5 satisfy the following function: Among them, g(x) is the preset value.

8. The battery pack according to any one of claims 1 to 4, wherein: The battery pack further includes a first pressure relief channel, the first pressure relief channel being spaced apart from and insulated from the electrode; When the pressure relief valve is opened, the first pressure relief channel is communicated with the interior of the battery cell through the pressure relief valve.

9. The battery pack according to claim 8, wherein: It also includes an insulating layer, which is located on one side of the pole of the battery cell and contacts the end of the first pressure relief channel away from the pressure relief valve and the pole respectively. When the pressure relief valve is opened, the thermal runaway material rushing out of the first pressure relief channel can break through the insulating layer.

10. The battery pack according to claim 9, wherein: The battery pack further includes a cover plate, which is located on one side of the pole of the battery cell, and the insulating layer is located between the cover plate and the battery cell module.

11. The battery pack according to claim 10, wherein: A second pressure relief channel is further provided between the cover plate and the insulating layer. When the pressure relief valve is opened, the second pressure relief channel is communicated with the first pressure relief channel.

12. The battery pack according to claim 11, wherein: The battery pack further includes an explosion-proof valve and a box body. The explosion-proof valve is arranged on the cover plate or the box body, and the explosion-proof valve is communicated with the second pressure relief channel.

13. The battery pack according to claim 12, wherein: It also includes a bottom guard plate, which is located on a side of the cooling plate away from the battery core module and is connected to the box body.

14. The battery pack according to claim 9, wherein: It also includes a cooling medium inlet and a cooling medium outlet, wherein the cooling medium inlet and the cooling medium outlet are both provided on the box body; The cooling plate has a cooling channel, and the cooling medium inlet and the cooling medium outlet are respectively communicated with the cooling channel.

15. The battery pack according to claim 9, wherein: It also includes a CCS component, which is located between the insulation layer and the battery cell module.

16. An electrical device, characterized in that: include: The battery pack according to any one of claims 1 to 15.

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