Battery pack and electrical device

Abstract

Disclosed are a battery pack and an electrical device. The battery pack of the present application comprises a protection plate, the protection plate having a first surface and being provided with first grooves, and openings of the first grooves penetrating through the first surface; and a liquid cooling plate, the liquid cooling plate being connected to the protection plate, the side of the liquid cooling plate facing the first surface being provided with protrusion portions, and the protrusion portions being located in the first grooves. The protection plate is provided with through holes, and the through holes penetrate through the corresponding first grooves in a first direction. According to the present application, the through holes penetrating through the corresponding first grooves are formed in the protection plate connected to the liquid cooling plate, so that the impact force applied to the liquid cooling plate can be effectively dispersed, thereby protecting a battery cell structure.

Description

Battery packs and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 19, 2023, with application number 202321907819.7 and application name “Battery Pack and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to, but are not limited to, the field of power battery technology, and specifically to a battery pack and an electrical device. Background Art

[0003] The current structure of liquid-cooled battery packs is as follows: battery cells are arranged above the liquid cooling plate, a protective plate is arranged below the liquid cooling plate, thermal glue or thermal conductive sheets are placed between the liquid cooling plate and the battery cells, and thermal insulation foam is used to fill the space between the liquid cooling plate and the protective plate. When the bottom of the battery pack is impacted, the protective plate and thermal insulation foam serve to protect the liquid cooling plate and battery cells. Due to the complexity of the liquid cooling plate flow channel structure and the raised structure set on the protective plate, this structure results in a small local assembly gap. The thermal insulation foam between the liquid cooling plate and the protective plate cannot wrap the liquid cooling plate well, and the ideal protective effect cannot be achieved. In addition, when the bottom of the battery pack is impacted, if the impact hits the liquid cooling plate flow channel, the thermal insulation foam cannot disperse the impact force well, which eventually damages the liquid cooling plate flow channel and causes battery failure. Technical issues

[0004] The present application provides a battery pack and an electrical device that can effectively disperse the impact force applied to the liquid cooling plate and protect the battery cell structure. Technical Solutions

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] In a first aspect, an embodiment of the present application provides a battery pack, comprising a protective plate, the protective plate having a first surface, the protective plate being provided with a first groove, and an opening of the first groove passing through the first surface;

[0007] a liquid cooling plate, the liquid cooling plate being connected to the guard plate, the liquid cooling plate being provided with a raised portion on a side facing the first surface, the raised portion being located in the first groove;

[0008] The guard plate is provided with a through hole, and the through hole passes through the first groove along a first direction.

[0009] Optionally, the area of ​​the through hole is S1 mm 2 , the area of ​​the first surface is S p mm 2 , meet: 0.1S p≤S1≤0.8S p .

[0010] Optionally, the S1 satisfies: 0.11×10 4 ≤S1≤15×10 4 .

[0011] Optionally, the S p Satisfaction: 1.125×10 4 ≤S p ≤18.8×10 4 .

[0012] Optionally, the width of the through hole is W1 mm, and the width of the first groove is W r mm, meet: 0.6W r ≤W1≤0.9W r .

[0013] Optionally, W1 satisfies: 5.4≤W1≤22.5;

[0014] Optionally, the W r Satisfy: 9≤W r ≤25.

[0015] Optionally, the guard plate includes a second groove, the opening of the second groove passes through the first surface, a gasket is provided in the second groove, the gasket has a third surface and a fourth surface that are opposite to each other along the first direction, the third surface is connected to the liquid cooling plate, and the fourth surface is connected to the bottom wall of the second groove.

[0016] Optionally, the height of the gasket in the first direction is H f mm, the depth of the second groove in the first direction is D1 mm, satisfying: 0 <H f -D1≤D1.

[0017] Optionally, D1 satisfies: 2≤D1≤3.

[0018] Optionally, the H f Satisfaction: 3 <H f ≤6.

[0019] Optionally, the area of ​​the third surface of the gasket is S f , the area of ​​the first surface is S p , satisfied: 0 f ≤0.01S p .

[0020] Optionally, the guard plate is made of elastic material.

[0021] ​Optionally, the deformation amount of the guard plate under a pressure of 10 MPa to 15 MPa ranges from 40% to 50%.

[0022] In a second aspect, the present application also provides an electrical device comprising the above-mentioned battery pack. Beneficial effects

[0023] Compared to the prior art, the present application provides a battery pack and an electrical device. The battery pack structure of the present application includes a protective plate, the protective plate having a first surface, the protective plate being provided with a first groove, the opening of the first groove passing through the first surface; a liquid cooling plate, the liquid cooling plate being connected to the protective plate, the liquid cooling plate being provided with a protrusion on the side facing the first surface, the protrusion being located in the first groove; wherein the protective plate is provided with a through hole, the through hole passing through the first groove along a first direction. By providing a through hole passing through the first groove on the protective plate connected to the liquid cooling plate, the present application can effectively disperse the impact force applied to the liquid cooling plate and protect the battery cell structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the front structure of the guard plate according to an embodiment of the present application;

[0025] FIG2 is a schematic diagram of the back structure of the guard plate according to an embodiment of the present application;

[0026] FIG3 is an enlarged schematic diagram of the structure of section A in FIG1 ;

[0027] FIG4 is an enlarged schematic diagram of the structure of portion B in FIG2 ;

[0028] FIG5 is a schematic diagram of the three-dimensional structure of the guard plate according to an embodiment of the present application;

[0029] FIG6 is an enlarged schematic diagram of the structure of section C in FIG5 ;

[0030] FIG7 is a schematic diagram of the back structure of the liquid cooling plate according to an embodiment of the present application;

[0031] FIG8 is a schematic diagram of the three-dimensional structure of the liquid cooling plate according to an embodiment of the present application;

[0032] FIG9 is a schematic structural diagram of a gasket according to an embodiment of the present application;

[0033] FIG10 is a schematic diagram of the bottom structure of a battery pack according to an embodiment of the present application;

[0034] Figure markings: 1-protective plate, 101-first surface, 102-second surface, 103-first groove, 104-through hole, 1041-first through hole, 1042-second through hole, 105-second groove, 106-gasket, 1061-third surface, 1062-fourth surface, 107-third groove, 2-liquid cooling plate, 201-protrusion, 3-bottom plate, 301-reinforcement, 302-screw, 4-battery pack main structure.

[0035] Implementation Methods of the Application

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. 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 efforts are within the scope of protection of this application.

[0037] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0038] As shown in Figures 1, 2, and 3, the protective plate 1 in the embodiment of the present application is a flat plate. Its specific shape and specifications can be adjusted according to the structure of the battery pack. The protective plate 1 in the embodiment of the present application has a first surface 101 and is provided with a first groove 103. The opening of the first groove 103 extends through the first surface 101. In some optional embodiments, the protective plate 1 is provided with a through hole 104, which extends through the first groove 103 along the first direction Z.

[0039] The battery pack of the present application also includes a liquid cooling plate 2 structure. FIG7 is a schematic diagram of the back structure of the liquid cooling plate 2 provided in an embodiment of the present application. FIG8 is a schematic diagram of the three-dimensional structure of the liquid cooling plate 2 provided in an embodiment of the present application. The liquid cooling plate 2 is the heat dissipation system of the battery pack. When the internal temperature of the battery pack is too high, the liquid cooling plate 2 can be used to dissipate heat. When the temperature is too low, the liquid cooling plate 2 can be used for low-temperature heating. The front of the liquid cooling plate 2 is in contact with the battery cell through a heat-conducting medium. The back of the liquid cooling plate 2 is in contact with the protective plate 1. The side of the liquid cooling plate 2 facing the first surface 101 is provided with a protrusion 201, and the protrusion 201 is located in the first groove 103. In some optional embodiments, the protrusion 201 serves as a flow channel for the liquid cooling plate 2. In some embodiments, the position of the first groove 103 provided on the protective plate 1 corresponds one-to-one with the protrusion 201. The battery pack of the present application is provided with a protective plate 1 on one side of the liquid cooling plate 2 to reduce the impact force on the liquid cooling plate 2 when the battery cell is impacted. However, if the ball strikes the bottom of the battery pack and hits the flow channel, if the guard plate 1 cannot effectively disperse the force, the flow channel on the liquid cooling plate 2 will be damaged, leading to battery failure. By providing through-holes 104 within the first groove 103, the hollow through-holes 104 prevent the flow channel on the liquid cooling plate 2 from being directly squeezed when the battery pack is impacted. The energy from the impact is not transferred to the liquid cooling plate through the guard plate 1, but rather dispersed to the area of ​​the liquid cooling plate without a flow channel. This dispersed impact force significantly reduces its impact on the interior of the battery pack, thereby improving the safety of the battery pack.

[0040] In some optional embodiments, one or more through holes 104 can be distributed in the first groove 103, and the shape and distribution position of the through holes 104 can be adjusted according to actual needs. As a more preferred embodiment, the distribution of the through holes 104 on the guard plate 1 is more uniform, that is, the area of ​​the through holes 104 distributed per unit area of ​​the guard plate 1 is the same or basically the same.

[0041] In some embodiments, the first grooves 103 distributed on the first surface 101 of the guard plate 1 are contoured structures that mimic the protrusions 201 provided on the liquid cooling plate 2. The distribution direction of the first grooves 103 on the guard plate 1 can be adjusted according to actual needs. As shown in Figures 1, 2, and 3, the first grooves 103 extend along the second direction X and / or the third direction Y.

[0042] In some optional embodiments, the area of ​​the through hole 104 is S1 mm 2 , the area of ​​the first surface 101 is S p mm 2 , meet: 0.1S p ≤S1≤0.8S p For example, the area of ​​the through hole 104 is S1, which can be 0.1S p, 0.2S p , 0.3S p , 0.4S p , 0.5S p , 0.6S p , 0.7S p , 0.8S p The area of ​​the through hole 104 of the present application on the first surface 101 is within this range, which can effectively prevent the flow channel structure from being squeezed when the guard plate 1 is impacted.

[0043] The area S1 of the through hole 104 in this application refers to the orthographic projection area of ​​the through hole 104 on the plane formed by the XY axis. The area S1 of the guard plate 1 is p It refers to the positive projection area of ​​the guard plate 1 on the plane formed by the XY axis. When the guard plate 1 is a regular structure, such as a rectangular structure, the area of ​​the guard plate 1 can also be calculated by multiplying the length value of the guard plate 1 by the width value of the guard plate 1.

[0044] In some optional embodiments, S1 satisfies: 0.11×10 4 ≤S1≤15×10 4 In some embodiments, the value of S1 is 0.11×10 4 , 0.9×10 4 , 1.0×10 4 , 2×10 4 , 3×10 4 , 4×10 4 , 5×10 4 , 6×10 4 , 7×10 4 , 8×10 4 , 9×10 4 , 10×10 4 , 11×10 4 , 12×10 4 , 13×10 4 , 14×10 4 , 15×10 4 Any value or a range of any two values. For example, the range of S1 is: 0.9×10 4 ≤S1≤1.88×10 4 .

[0045] In some alternative embodiments, S p The value of satisfies: 1.125×10 4 ≤S p ≤18.8×10 4 . Such as S p The value of is 1.125×10 4 , 2×104 , 3×10 4 , 4×10 4 , 5×10 4 , 6×10 4 , 7×10 4 , 8×10 4 , 9×10 4 , 10×10 4 , 11×10 4 , 12×10 4 , 13×10 4 , 14×10 4 , 15×10 4 , 16×10 4 , 17×10 4 , 18×10 4 , 18.8×10 4 Any value or range of any two values ​​in .

[0046] In some optional embodiments, the width of the through hole 104 is W1 mm, and the width of the first groove 103 is W r mm, meet: 0.6W r ≤W1≤0.9W r For example, the value of W1 is 0.6W. r , 0.7W r , 0.8W r , 0.9W r The width of the through hole 104 of the present application is within this range, which can effectively transmit the impact force to the position of the liquid cooling plate 2 without a flow channel.

[0047] The width W1 mm ​​of the through hole 104 in this application refers to the smaller side length of the through hole 104 in the second direction X or the third direction Y. The width W1 mm ​​of the first groove 103 r Refers to the smaller side length of the first groove 103 in the second direction X or the third direction Y. As shown in FIG2 , in a specific application example, the through hole 104 extending in the second direction X is the first through hole 1041, and W1 refers to the length of the first through hole 1041 in the third direction Y. For example, taking the through hole 104 extending in the third direction Y as the second through hole 1042, the width of the second through hole 1042 refers to the length of the second through hole 1042 in the second direction X.

[0048] In some optional embodiments, W1 satisfies: 5.4≤W1≤22.5. For example, the value of W1 is any value of 5.4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 22.5, or a range consisting of any two values.

[0049] In some alternative embodiments, W r Satisfy: 9≤W r ≤25. Such as W r The value of can be any value among 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, or a range consisting of any two values.

[0050] The length L1 mm of the through hole 104 in this application refers to the larger side length of the through hole 104 in the second direction X or the third direction Y. The length L1 mm of the first groove 103 r Refers to the larger side length of the first groove 103 in the second direction X or the third direction Y. As shown in Figures 1 to 4, when the through hole 104 extends along the second direction X, L1 refers to the length of the through hole 104 in the second direction X. As shown in Figure 1, the first groove 103 is a groove structure surrounding the guard plate 1. The definition of the length of the first groove 103 is only used as one application example. The length of the first groove 103 refers to the length of the first groove 103 that does not change in the second direction X or the third direction Y.

[0051] In some optional embodiments, the length of the through hole 104 is L1 mm, and the length of the first groove 103 is L r mm, meet: 0.6L r ≤L1≤0.9L r The length of the through hole 104 of the present application is within this range, which can effectively transmit the impact force to the position of the liquid cooling plate 2 without the flow channel, thereby preventing the battery cell structure at the position of the flow channel from being impacted.

[0052] In some optional embodiments, the following condition is satisfied: 90≤L1≤270. For example, the value of L1 is any value among 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, and 270, or a range consisting of any two values.

[0053] In some embodiments, the protective plate 1 includes a second groove 105 extending through the first surface 101. In some embodiments, the second groove 105 is located at a different location than the first groove 103. As shown in FIG5 , the second groove 105 is located between the first grooves 103. In some embodiments, a gasket 106 is disposed in the second groove 105. The gasket 106 has a third surface 1061 and a fourth surface 1062 that are spaced apart from each other along the first direction Z. The third surface 1061 is connected to the liquid cooling plate 2, and the fourth surface 1062 is connected to the bottom wall of the second groove 105. In some other embodiments, the gasket 106 is made of an elastic material, such as a rubber gasket or a silicone gasket. The present application provides a second groove 105 on the protective plate 1 and a gasket 106 in the second groove 105. The gasket 106 contacts the liquid cooling plate 2 and absorbs the assembly tolerance between the protective plate 1 and the liquid cooling plate 2 during assembly, thereby preventing the internal structure of the assembled battery pack from shaking due to the assembly tolerance.

[0054] In specific applications, the shape of the second groove 105 is not limited and can be selected within the scope of meeting the purpose of this application. As shown in Figure 5, the bottom wall shape of the second groove 105 is a long strip. The groove structure is matched with the shape of the gasket 106 (which is a long columnar shape in this embodiment) to achieve better assembly of the gasket 106.

[0055] In some optional embodiments, the height of the spacer 106 in the first direction Z is H f mm, the depth of the second groove 105 in the first direction Z is D1 mm, satisfying: 0 <H f -D1≤D1. The present application can effectively absorb the assembly tolerance between the guard plate 1 and the liquid cooling plate 2 by setting the height difference between the gasket 106 and the second groove 105. In some optional ways, it satisfies: 0.2D1 <H f -D1≤D1.

[0056] In some optional embodiments, D1 satisfies: 2≤D1≤3. For example, the value of D1 is any value among 2, 2.2, 2.4, 2.6, 2.8, 3.0, or a range consisting of any two values.

[0057] In some alternative embodiments, H f Satisfaction: 3 <H f ≤6. Such as H f The value of can be any value among 3.5, 4, 4.5, 5, 5.5, 6 or a range consisting of any two values. f Satisfy 5≤H f ≤6.

[0058] As shown in FIG9 , the area of ​​the third surface 1061 of the gasket 106 of the present application is Sf , the area of ​​the first surface 101 is S p , satisfied: 0 f ≤0.01S p When the gasket 106 of the present application meets this condition, it can offset the assembly tolerance between the guard plate 1 and the liquid cooling plate 2 without affecting the heat exchange effect of the battery pack. When the number of gaskets 106 is too large and the area of ​​the gasket 106 exceeds 0.01S p , which will affect the installation stability of the structure. The area of ​​the third surface 1061 of the gasket 106 of this application refers to the positive projection area of ​​the gasket 106 on the plane formed by the XY axis. When the gasket 106 is a regular shape, the area S of the gasket 106 is f It can be the area of ​​the third surface 1061 or the fourth surface 1062. In some other optional ways, the gaskets 106 are evenly distributed on the guard plate 1, that is, the number of gaskets 106 distributed per unit area of ​​the guard plate 1 is the same. In other optional ways, each gasket 106 provided on the guard plate 1 in the present application has the same specifications. When the battery pack structure of the present application has multiple gaskets 106, S f is the sum of the surface areas of the plurality of gaskets 106 .

[0059] In some embodiments, the surface area of ​​each spacer 106 is in the range of 90-100 mm 2 In some other optional embodiments, the number of gaskets 106 arranged on the guard plate 1 is in the range of 10 to 15.

[0060] In order to ensure that the protective plate 1 of the present application can effectively disperse the impact force and protect the liquid cooling plate 2, in some optional methods, the interval between the second groove 105 and the first groove 103 in the second direction X is from 80 mm to 130 mm; the interval between the second groove 105 and the first groove 103 in the third direction Y is from 200 mm to 400 mm.

[0061] In some optional embodiments, the guard plate 1 of the present application is made of an elastic material, such as the guard plate 1 has a deformation range of 40% to 50% under a pressure of 10 to 15 MPa. In the present application, the deformation of the elastic material is measured as follows: Referring to GB / T18942.1-2003, the deformation of the elastic material is measured.

[0062] In some optional embodiments, the battery pack of the present application further includes a bottom plate 3, on which a reinforcing member 301 is provided, and a third groove 107 is provided on the protective plate 1, and the third groove 107 is arranged opposite to the reinforcing member 301. The bottom plate 3 is fixed to the bottom of the battery pack by screws 302.

[0063] ​The battery pack structure of this application has been subjected to impact and vibration tests. The results show that the through-holes 104 provided on the guard plate 1 structure can effectively protect the liquid cooling plate structure. The energy caused by the impact will not be transmitted to the liquid cooling plate 2 through the guard plate 1. The force can be dispersed to the position where the liquid cooling plate 2 has no flow channel. The impact of the dispersed force on the interior of the battery pack is also greatly reduced. The liquid cooling plate structure is not damaged, and its safety performance is improved. The vibration test results show that the battery pack structure of this application has no abnormal sound, indicating that the provision of the gasket structure in this application has strengthened the fit between the guard plate 1 and the liquid cooling plate 2, avoiding abnormal sound in the battery pack structure after assembly due to the existence of assembly tolerances between the two.

[0064] Accordingly, embodiments of the present application further provide an electrical device comprising the aforementioned battery pack. For example, the device may be a new energy vehicle, such as an electric car, electric bicycle, electric motorcycle, or electric scooter. It is understood that the device may possess all the technical features and benefits of the aforementioned battery module, and further details will not be given here.

[0065] Example 1: The battery pack main structure 4, liquid cooling plate 2, protective plate 1, and base plate 3 were stacked and installed in this order. Ten gaskets 106 were installed on protective plate 1 to form a battery pack structure. The structural parameters of the battery pack are shown in Table 1. The assembled battery pack structure was subjected to impact and vibration tests. The flow channel of the liquid cooling plate 2 was observed for damage and abnormal noise.

[0066] Examples 2 to 15: The structure of the guard plate 1 used is as described above. The difference from Example 1 is that the parameters of the structure of the guard plate 1 are adjusted. The specific parameters are shown in Table 1.

[0067] Example 16: The protective plate 1 used is a conformal structure of the liquid cooling plate 2 and the base plate 3, and the second groove 105 and the gasket 106 are not provided.

[0068] Comparative Example 1: The protective plate 1 of Comparative Example 1 is a conformal structure of the liquid cooling plate 2 and the base plate 3, and is not provided with the through hole 104, the second groove 105 and the gasket 106 structure.

[0069] Comparative Example 2: The main structure of Comparative Example 2 is the same as that of Example 1, except that the guard plate 1 of Comparative Example 2 is a conformal structure of the liquid cooling plate 2 and the base plate 3, and no through hole 104 is provided.

[0070] The applicant provided the battery pack structures of Examples 1 to 16 and Comparative Examples 1 to 2. Each corresponding structure was installed with 30 groups of battery packs of the same structure to test the performance of the battery pack structure. The test method is as follows:

[0071] Impact performance test method: Use a steel ball with a diameter of 25mm to squeeze the corresponding position of the flow channel at the bottom of the battery pack, and give an initial energy of 120J for simulation testing.

[0072] Vibration test method: GB38031-2020.

[0073] Table 1 Structural parameters of Examples 1-16 and Comparative Examples 1-2 of the present application

[0074] Table 2 Structural parameters and test results of Examples 1-16 and Comparative Examples 1-2 of the present application

[0075] From the results in Table 2, it can be seen that the battery pack in the present application can effectively disperse the energy of the impact when hit by a ball, improve the protection of the liquid cooling plate and the battery cell, and have better safety. In the present application, by setting the through hole 104, when the steel ball hits the bottom of the battery pack, the steel ball first contacts the bottom plate 3, and the bottom plate 3 is deformed and concave inwards. The flow channel position where the guard plate 1 is located has a hollow structure due to the presence of the through hole. The inwardly concave bottom plate will not contact the guard plate 1, and the energy brought by the impact will not be transmitted to the liquid cooling plate 2 through the guard plate 1. Its force can be dispersed to the position where the liquid cooling plate 2 has no flow channel. The influence of the dispersed force on the interior of the battery pack is also greatly reduced, thereby improving its safety performance. In addition, the gasket provided in the present application can reduce the abnormal noise rate of the battery pack structure. In the experiment of the present application, the structural parts are all within the safe range, the liquid cooling system will not leak, the system will not catch fire, and will not explode, meeting IP67.

[0076] The above is a detailed introduction to the battery pack and electrical device provided by 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 of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will 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, wherein: include A guard plate (1), the guard plate (1) having a first surface (101), the guard plate (1) being provided with a first groove (103), the opening of the first groove (103) passing through the first surface (101); A liquid cooling plate (2), the liquid cooling plate (2) being connected to the guard plate (1), a protrusion (201) being provided on a side of the liquid cooling plate (2) facing the first surface (101), and the protrusion (201) being located in the first groove (103); The guard plate (1) is provided with a through hole (104), and the through hole (104) penetrates the first groove (103) along a first direction (Z).

2. The battery pack according to claim 1, wherein: The area of ​​the through hole (104) is S1mm 2 , the area of ​​the first surface (101) is S p mm 2 , meet: 0.1S p ≤S1≤0.8S p .

3. The battery pack according to claim 2, wherein: The S1 meets: 0.11×10 4 ≤S1≤15×10 4 .

4. The battery pack according to claim 2, wherein: The S p Satisfaction: 1.125×10 4 ≤S p ≤18.8×10 4 .

5. The battery pack according to claim 1, wherein: The width of the through hole (104) is W1 mm, and the width of the first groove (103) is W r mm, meets: 0.6W r ≤W1≤0.9W r .

6. The battery pack according to claim 5, wherein: The W1 satisfies: 5.4≤W1≤22.

5.

7. The battery pack according to claim 5, wherein: The W r Satisfy: 9≤W r ≤25.

8. The battery pack according to claim 1, wherein: The guard plate (1) comprises a second groove (105), the opening of the second groove (105) passes through the first surface (101), a gasket (106) is arranged in the second groove (105), and the gasket (106) has a third surface (1061) and a fourth surface (1062) which are separated from each other along a first direction (Z), the third surface (1061) is connected to the liquid cooling plate (2), and the fourth surface (1062) is connected to the bottom wall of the second groove (105).

9. The battery pack according to claim 8, wherein: The height of the gasket (106) in the first direction (Z) is H f mm, the depth of the second groove (105) in the first direction (Z) is D1 mm, satisfying: <H f -D1≤D1.

10. The battery pack according to claim 9, wherein: The D1 satisfies: 2≤D1≤3.

11. The battery pack according to claim 9, wherein: The H f Satisfaction: 3 <H f ≤6.

12. The battery pack according to claim 8, wherein: The area of ​​the third surface (1061) of the gasket (106) is S f , the area of ​​the first surface (101) is S p , satisfies: 0 f ≤0.01S p .​ 13. The battery pack according to claim 1, wherein: The guard plate (1) is made of elastic material.

14. The battery pack according to claim 1, wherein: The deformation amount of the guard plate (1) under a pressure of 10 MPa to 15 MPa ranges from 40% to 50%.

15. An electrical device, wherein: A battery pack comprising the battery pack as claimed in any one of claims 1 to 14.

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