Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment with the same. The battery device comprises a plurality of batteries, a box body, a filler and a bonding body, each battery includes a battery body. The box body accommodates a plurality of batteries and comprises a side wall and a bottom wall. And the filler is positioned between the plurality of batteries and the side wall and / or between the adjacent batteries. The bonding body is located on the bottom side of the filler, is arranged between the bottom wall of the box body and the bottom end face of the battery body, wraps part of the side face of the battery body and has the elasticity modulus larger than that of the filler. The height of the coated part of the side surface of the battery body is h, the height of the battery body is H, and the value range of the ratio h / H is 0.05-0.5. The structure not only can effectively prevent infirm connection caused by the fact that the filler intrudes between the bottom wall of the box body and the bottom end face of the battery body, but also can prevent the electrode body from being extruded and damaged by a bonding body in the expansion process.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and in particular to a battery device and an electrical appliance having the battery device. Background Technology

[0002] Some battery devices include a housing and multiple batteries housed within it. The batteries are typically fixed to the bottom wall of the housing, for example, by adhesive bonding. For various reasons, such as insulation, heat insulation, vibration absorption, cushioning, and compensating for volume changes during battery cycling, fillers such as foam may be used between adjacent batteries or between the batteries and the side walls of the housing. However, such battery devices suffer from the problem of loose connections between the batteries and the bottom wall of the housing. Utility Model Content

[0003] In view of this, the present disclosure provides a battery device and an electrical appliance having the same, which aims to at least improve the problem of the battery not being securely connected to the bottom wall of the housing.

[0004] In one aspect, this disclosure provides a battery device. The battery device includes a plurality of batteries, a housing, filler, and an adhesive. Each battery includes a battery body. The housing houses the plurality of batteries and includes side walls and a bottom wall. The filler is disposed between adjacent batteries and / or between the plurality of batteries and the side walls of the housing. The adhesive is located on the bottom side of the filler, disposed between the bottom wall of the housing and the bottom end face of the battery body, and covers a portion of the side surface of the battery body, and has a larger elastic modulus than the filler. The height of the covered side surface of the battery body is h, the height of the battery body is H, and the ratio h / H ranges from 0.05 to 0.5.

[0005] On the other hand, this disclosure also provides an electrical appliance. The electrical appliance includes the aforementioned battery device.

[0006] According to the battery device and electrical equipment provided in this disclosure, the adhesive is disposed between the bottom wall of the casing and the bottom surface of the battery body, and covers part of the side surface of the battery body. This makes it difficult for fillers with a low elastic modulus to penetrate between the bottom wall of the casing and the bottom surface of the battery body. The fixed connection between the battery and the bottom wall of the casing is achieved by the adhesive with a high elastic modulus, which helps to improve the connection strength between the battery and the bottom wall of the casing. Based on this, the ratio h / H of the height h of the side portion of the battery body covered by the adhesive to the height H of the battery is limited to a suitable range of 0.05-0.5. If the ratio h / H is too small, i.e., less than 0.05, the filler will easily penetrate between the bottom wall of the casing and the bottom surface of the battery body, thereby deteriorating the connection strength between the battery and the bottom wall of the casing. If the ratio h / H is too large, i.e., greater than 0.5, the adhesive with a high elastic modulus (i.e., not easily deformed) will cause excessive compression to the battery body when the battery body expands. This compression can easily damage the electrodes in the battery body. By limiting the range of the ratio h / H to 0.05-0.5, it can effectively prevent the connection from being weak due to the intrusion of filler into the bottom wall of the box and the bottom surface of the battery body, and also avoid damaging the electrode body. Attached Figure Description

[0007] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0008] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0009] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0010] Figure 1 This is a schematic diagram of a battery device according to an embodiment of the present disclosure.

[0011] Figure 2 for Figure 1 An exploded view of the battery device.

[0012] Figure 3 For along Figure 1 A schematic cross-sectional view taken along line AA.

[0013] Figure 4 for Figure 3 A schematic cross-sectional view of the battery.

[0014] Figure 5 This is a schematic cross-sectional view of a battery device according to another embodiment of the present disclosure.

[0015] Figure 6 This is a schematic cross-sectional view of a battery device according to another embodiment of the present disclosure.

[0016] Figure 7 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0017] Explanation of reference numerals in the attached figures:

[0018] 100, Battery assembly; 10, Battery; 11, Battery body; 111, Packaging; 112, Electrode; 1121, Separator; 1122, Electrode sheet; 113, Bottom surface of battery body; 114, Tab; 12, Terminal post; 20, Housing; 21, Top wall of housing; 22, Bottom wall of housing; 23, Side wall of housing; 30, Filler; 40, Adhesive; 50, Electrical connector; 60, Insulating pad; 61, Channel; 70, Pressure relief valve; 71, Pressure relief hole; 80, Heat dissipation structure; 200, Electrical equipment. Detailed Implementation

[0019] Numerous specific details are set forth below to provide an understanding of the structure, function, and purpose of the embodiments described in the specification and illustrated in the accompanying drawings. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0020] Previous battery devices suffered from insufficiently secure bonding between the battery and the bottom wall of the casing. The inventors discovered that the primary cause of this problem was the intrusion of filler material between the battery's bottom surface and the casing's bottom wall. To perform functions such as insulation, heat insulation, vibration absorption, cushioning, and compensating for volume changes during battery cycling, filler material is typically made of low-modulus materials like foam. However, such filler material is difficult to use to form a secure bond between the battery and the casing's bottom wall. Therefore, filler material intrusion between the battery's bottom surface and the casing's bottom wall leads to an insufficiently secure bonding between the battery and the casing's bottom wall.

[0021] Take a battery device using foamed materials as an example. During assembly, uncured adhesive is typically applied to the bottom wall of the casing first. Then, the battery is placed on the bottom wall and bonded to it using the adhesive. The adhesive requires a considerable amount of time to fully cure. For manufacturing efficiency, foamed material is often filled between multiple batteries and the casing side walls, and / or between multiple batteries, before the adhesive has fully cured. After filling, the foamed material increases in volume and hardens simultaneously. This can cause the foamed material to push out the uncured adhesive and thus intrude between the battery and the casing bottom wall.

[0022] To address the problem of insufficient connection between the battery and the bottom wall of the casing caused by filler material intruding between the bottom surface of the battery and the bottom wall of the casing, this disclosure provides a battery device and an electrical device having the same. The battery device and electrical device provided in this disclosure are illustrated below with specific embodiments.

[0023] <Exemplary battery device>

[0024] This disclosure provides a battery device 100 according to one embodiment. For ease of understanding, the overall structure of the battery device 100 will be described below by way of example. It should be understood that the structure of the battery device 100 is not limited to the following description. For example, one or more elements mentioned below may be omitted or replaced, and their layout relationships may be changed.

[0025] refer to Figure 1 and Figure 2 The battery device 100 includes a plurality of batteries 10, a housing 20, a filler 30, and an adhesive 40.

[0026] Battery 10 is an energy storage unit capable of repeated discharge and re-discharge, which can be interpreted as a "secondary battery". In this disclosure, the concept of "secondary battery" may include, but is not limited to, lithium-ion secondary batteries, sodium-ion secondary batteries, lead-acid batteries, and nickel-metal hydride batteries, etc.

[0027] refer to Figure 3 Battery 10 may include battery body 11. (See reference) Figure 4 The battery body 11 may include a package 111 and one or more electrode bodies 112 housed therein. Depending on the construction of the package 111, the battery 10 may be a cylindrical battery, a prismatic battery, a pouch battery, or other types of batteries.

[0028] Continue to refer to Figure 3 The battery 10 may also include a terminal 12, which is located at one end of the battery body 11. (See also: by way of example only) Figure 2 and Figure 3 The battery device 100 may also include an electrical connector 50, which can be connected to the terminal 12, for example by welding, to connect multiple batteries 10 in parallel or in series, thereby helping the battery device 100 to obtain sufficient capacity and operating voltage.

[0029] In this disclosure, the end of the battery body 11 with the terminal post 12 can be called the top end, and the other end opposite the top end can be called the bottom end. As far as the battery 10 as a whole is concerned, the bottom end of the battery body 11 can constitute the bottom end of the battery 10, and the top end of the terminal post 12 can constitute the top end of the battery 10.

[0030] The direction from the top to the bottom of the battery body 11, and the direction from the bottom to the top of the battery body 11, can be collectively referred to as the height direction. The height of a certain element can refer to the dimension of that element in the height direction.

[0031] For ease of understanding, in the accompanying drawings, the height direction is indicated by arrows Z+ and Z-, where arrow Z+ indicates the direction from the bottom to the top of the battery body 11, and arrow Z- indicates the direction from the top to the bottom of the battery body 11.

[0032] It should be noted that, in this disclosure, the direction from the top to the bottom of the battery body 11 is not necessarily the same as the direction of gravity. Depending on the orientation of the battery device 100 during use, the direction from the top to the bottom of the battery body 11 can be the same as, opposite to, oblique to, or orthogonal to the direction of gravity. This disclosure does not impose any particular restrictions on the orientation of the battery device 100 during use.

[0033] refer to Figure 2 and Figure 3 The housing 20 can accommodate multiple batteries 10, providing them with protection and support. The housing 20 may include multiple walls 21, 22, and 23, wherein walls 21 and 22 are opposite each other in the height direction, with wall 21 located at the top of the battery 10 and wall 22 located at the bottom. That is, the battery 10 is located between walls 21 and 22, and the direction from wall 21 to wall 22 is consistent with the direction from the top to the bottom of the battery 10. Wall 23 is located between walls 21 and 22, and the multiple walls 21, 22, and 23 together form the internal space of the housing 20. For ease of description, wall 21 will be referred to as the top wall, wall 22 as the bottom wall, and wall 23 as the side wall.

[0034] In the following text, directional terms such as "above" and "below" will be used when describing the relative positional relationship between two elements. For example, "the first element is above the second element" can mean that the first element is closer to the top wall 21 of the housing 20 in the vertical direction than the second element. Conversely, "the first element is below the second element" can mean that the first element is closer to the bottom wall 22 of the housing 20 in the vertical direction than the second element.

[0035] Continue to refer to Figure 3 The filler 30 is located between the multiple cells 10 and the sidewall 21, and / or between adjacent cells 10. The filler 30 may have a low elastic modulus to play a positive role in vibration absorption, buffering, and compensating for volume changes during battery cycling. The filler 30 may also have good insulation properties to prevent short circuits between cells 10. The filler 30 may also have low thermal conductivity to prevent thermal runaway of adjacent cells 10 from being triggered by thermal runaway of a single cell 10.

[0036] By way of example only, the filler 30 can be a foam. Foam has a low modulus of elasticity, effectively absorbing vibrations, buffering, and compensating for volume changes during battery cycling. Furthermore, the insulating properties of the foam prevent direct contact between adjacent batteries 10 and between the battery 10 and the casing, avoiding the risk of short circuits. Additionally, the foam has low thermal conductivity, which can delay the spread of heat to adjacent batteries 10 in the event of thermal runaway caused by a fault in a single battery 10, reducing the risk of cascading thermal runaway. Moreover, the foam is lightweight and does not significantly increase the overall mass of the battery assembly 100.

[0037] For example, the foam material can be one of polyurethane, silicone, or acrylic. Foam can also be a hybrid combination of these materials. The advantages of polyurethane, silicone, and acrylic materials are: good impact resistance, insulation, and thermal insulation properties.

[0038] Continue to refer to Figure 3 The adhesive 40 is located on the bottom side of the filler 30 to fix the battery 10 to the housing 20 by adhesive bonding, thus holding the battery 10 in a fixed position relative to the housing 20. The adhesive 40 can have a relatively large elastic modulus, which should be greater than the elastic modulus of the filler 30. The adhesive 40 with a larger elastic modulus can establish a stronger connection between the battery 10 and the housing 20. The adhesive 40 can also have better insulation properties to prevent short circuits between the batteries 10.

[0039] By way of example only, the adhesive 40 can be made of at least one of polyurethane, acrylic, epoxy, and silicone materials. Adhesive 40 can also be a hybrid combination of the above materials. The advantages of polyurethane, acrylic, epoxy, and silicone materials are: good adhesion, good insulation properties, resistance to cracking during use, and long service life.

[0040] Continue to refer to Figure 3 The adhesive 40 is disposed between the bottom wall 22 of the housing 20 and the bottom end face 113 of the battery body 11, and covers part of the side surface of the battery body 11. Here, the height of the part of the side surface of the battery body covered by the adhesive 40 is h, the height of the battery body 11 is H, and the ratio h / H ranges from 0.05 to 0.5.

[0041] An adhesive 40 is disposed between the bottom wall 22 of the housing 20 and the bottom end face 113 of the battery body 11, and covers part of the side surface of the battery body 11. This prevents the filler 30, with its lower elastic modulus, from easily penetrating between the bottom wall 22 of the housing 20 and the bottom end face 113 of the battery body 11. The fixed connection between the battery 10 and the bottom wall 22 of the housing 20 is achieved by the adhesive 40, which has a higher elastic modulus. This helps to improve the strength of the connection between the battery 10 and the bottom wall 22 of the housing 20. Furthermore, the ratio h / H of the height h of the side portion of the battery body 11 covered by the adhesive 40 to the height H of the battery body 11 is limited to a suitable range of 0.05-0.5. If the ratio h / H is too small, i.e., less than 0.05, the filler 30 will more easily penetrate between the bottom wall 22 of the housing 20 and the bottom end face 113 of the battery body 11, thereby deteriorating the strength of the connection between the battery 10 and the bottom wall 22 of the housing 20. If the ratio h / H is too large, i.e. greater than 0.5, the adhesive 40 with a large elastic modulus (i.e., not easily deformed) will cause excessive compression to the battery body 11 when it expands. This compression can easily damage the internal structure of the battery body 11, causing the battery 10 to fail or go out of control. By limiting the range of the ratio h / H to 0.05-0.5, the adhesive 40 can effectively prevent the connection from being weak due to the intrusion of the filler 30 between the bottom wall 22 of the housing 20 and the bottom end face 113 of the battery body 11, and can also avoid damage to the internal structure of the battery body 11.

[0042] Preferably, the ratio h / H can be in the range of 0.25-0.4. Alternatively, the ratio h / H can be 0.1, 0.15, 0.2, 0.3, 0.35, or 0.45, etc.

[0043] The elastic modulus of the filler 30 should be limited to a suitable range. If the elastic modulus of the filler 30 is too small, it will deform under very small stress, failing to provide sufficient lateral support for the multiple batteries 10. When the battery device 100 is subjected to impact, the filler 30 will be unable to effectively absorb energy. If the elastic modulus of the filler 30 is too large, it will be difficult for it to deform under the expansion force of the battery 10, thus compressing the battery 10 and potentially damaging its structure. Therefore, the elastic modulus of the filler 30 can be in the range of 50 MPa to 1000 MPa. By limiting the elastic modulus of the filler 30 to this range, it can both absorb energy from the multiple batteries 10 and allow for volume changes after expansion, preventing damage to the internal structure of the battery body 11.

[0044] Preferably, the elastic modulus of the filler 30 can be in the range of 150 MPa to 800 MPa. Alternatively, the elastic modulus of the filler 30 can be 100 MPa, 200 MPa, 250 MPa, 300 MPa, 350 MPa, 400 MPa, 450 MPa, 500 MPa, 550 MPa, 600 MPa, 650 MPa, 700 MPa, 750 MPa, 850 MPa, 900 MPa, or 950 MPa.

[0045] The elastic modulus of the adhesive 40 should also be limited to a suitable range. If the elastic modulus of the adhesive 40 is too small, the adhesive 40 will easily deform, thus failing to provide stable support and fixation for the battery 10. If the elastic modulus of the adhesive 40 is too large, the bond between the adhesive 40 and the battery 10 and the housing 20 will easily separate under impact, resulting in a weak connection between the battery 10 and the housing 20. Therefore, the elastic modulus of the adhesive 40 can be in the range of 100MPa-2000MPa. By limiting the elastic modulus of the adhesive 40 to this range, the adhesive 40 can provide stable support for the battery 10 and a strong bond between the battery 10 and the housing 20.

[0046] Preferably, the elastic modulus of the adhesive 40 can be in the range of 500MPa-1500MPa. Alternatively, the elastic modulus of the adhesive 40 can be 200MPa, 400MPa, 600MPa, 800MPa, 1000MPa, 1200MPa, 1400MPa, 1600MPa, or 1800MPa.

[0047] When the h / H ratio is low, the adhesive 40 should have a high adhesive strength to ensure sufficient connection strength between the battery 10 and the casing 20. Accordingly, in some examples, the adhesive strength of the adhesive 40 can range from 1 MPa to 40 MPa, and the h / H ratio can be further selected from 0.05 to 0.3. Thus, the adhesive 40 with high adhesive strength can ensure sufficient connection strength between the battery 10 and the casing 20. At the same time, a lower h / H can be achieved, preventing damage to the internal structure of the battery body 11 from compression by the adhesive 40. By limiting the adhesive strength of the adhesive 40 within this range, both the secure connection of the battery device 100 and the prevention of damage to the battery 10 are balanced.

[0048] Preferably, the bonding strength of the adhesive 40 can be in the range of 10MPa-30MPa. Alternatively, the bonding strength of the adhesive 40 can be 5MPa, 15MPa, 20MPa, 25MPa or 35MPa.

[0049] Preferably, the ratio h / H can be in the range of 0.1-0.2. Alternatively, the ratio h / H can be 0.08, 0.13, 0.15, 0.18, 0.23, 0.25 or 0.28.

[0050] refer to Figure 4 The battery body 11 includes a packaging body 111 and an electrode body 112 housed within the packaging body 111. The distance from the bottom end of the electrode body 112 to the bottom surface 113 of the battery body 11 is g, where g ≥ h. That is, the top end of the adhesive 40 is not higher than the bottom end of the electrode body 112, and the two have virtually no overlap in the height direction. During cycling, the expansion of the battery 10 mainly comes from the expansion of the electrode body 112. If the top end of the adhesive 40 is higher than the bottom end of the electrode body 112, then during the expansion of the battery 10, the overlapping portion of the electrode body 112 and the adhesive 40 in the height direction will be squeezed by the adhesive 40, which may severely damage the electrode body 112. Satisfying g ≥ h effectively prevents the electrode body 112 from being damaged during charging expansion.

[0051] Continue to refer to Figure 4 The electrode body 112 includes at least one separator 1121 and at least two electrodes 1122. Adjacent electrodes 1122 have opposite polarities, one being a positive electrode and the other a negative electrode. Adjacent electrodes 1122 are separated by a separator 1121 to prevent direct contact and short circuit. Each electrode 1122 includes a current collector and active material coated on the current collector. Squeezing the electrode 1122 can cause the active material to detach, leading to a decrease in battery performance or even failure. According to embodiments of this disclosure, the bottom edge of either electrode 1122 is higher than the bottom edge of the separator 1121, and the bottom end of the electrode body 112 is defined by the bottom edge of the separator 1121. Accordingly, the top of the adhesive 40 will not be higher than the bottom edge of the diaphragm 1121, and the bottom edge of any electrode 1122 is higher than the bottom edge of the diaphragm 1121. Thus, any electrode 1122 will not be squeezed by the adhesive 40, and the risk of active material falling off will be reduced.

[0052] refer to Figure 3 The battery 10 also includes a terminal post 12 disposed on the top of the battery body 11. The terminal post 12 can be electrically connected to the electrode body 112 via a tab 114, and can also be electrically connected to the electrical connector 50 inside the housing 20. The top of the filler 30 is lower than the top of the terminal post 12. That is, the terminal post 12 is not completely submerged in the filler 30. The portion of the terminal post 12 outside the filler 30 can be connected to the electrical connector 50 inside the housing 20.

[0053] Specifically, the distance d between the top of the filler 30 and the top of the terminal 12 is in the range of 0mm < d ≤ 5mm. The distance between the top of the filler 30 and the top of the terminal 12 should be within a suitable range. If the distance d is too large, meaning that less of the battery 10 is covered by the filler 30, the filler 30 will be unable to achieve insulation between multiple batteries 10; this will also lead to poor heat insulation, making it more likely that a single battery 10 will induce thermal runaway in nearby batteries, causing heat propagation and seriously affecting the safety of the battery device 100. If the distance d is too small, meaning that more of the battery 10 is covered by the filler 30, the filler 30, with its low thermal conductivity, will affect the heat dissipation of the battery 10. Additionally, the filler 30 requires more material, resulting in higher costs and increasing the overall weight of the battery device 100. Therefore, the distance d between the top of the filler 30 and the top of the electrode 12 can be within the range mentioned above, which can ensure that the multiple batteries 10 are insulated and heat-insulated from each other, and can also reduce costs and weight.

[0054] Preferably, the distance d between the top of the filler 30 and the top of the pole post 12 can be in the range of 1mm ≤ d ≤ 4mm. Alternatively, the distance d between the top of the filler 30 and the top of the pole post 12 can be 0.5mm, 1.5mm, 2mm or 3mm.

[0055] In a specific example, battery 10 can be a cylindrical battery. Considering that cylindrical batteries expand more after charging or heating, the ratio h / H should be small to ensure that the electrode body 112 of the cylindrical battery is not squeezed by the adhesive 40. However, if the ratio h / H is too small, the connection strength between the cylindrical battery and the casing 20 cannot be guaranteed. Therefore, the value range of the ratio h / H can be 0.05-0.45. Setting the ratio h / H within the above range ensures the connection strength between the cylindrical battery and the casing 20, while preventing the adhesive 40 from squeezing the electrode body 112 of the cylindrical battery.

[0056] Preferably, the ratio h / H can range from 0.15 to 0.4. Alternatively, the ratio h / H can be 0.1, 0.2, 0.3, or 0.35.

[0057] refer to Figure 5According to another embodiment of this disclosure, a pressure relief valve 70 is provided on the bottom end face 113 of the battery body 11. An adhesive 40 may be provided between the portion of the bottom end face 113 of the battery body 11 outside the pressure relief valve 70 and the bottom wall 22. That is, no adhesive 40 is provided between the pressure relief valve 70 and the bottom wall 22. In the current embodiment, the value range of the ratio h / H needs to be further set to 0.1-0.5. The pressure relief valve 70 at the bottom of the battery body 11 is used to preferentially open when the internal pressure of the battery 10 is too high due to thermal runaway or other abnormal conditions, guiding the direction of pressure relief and thus preventing the uncontrollable explosion of the battery 10. When the internal pressure of the battery rises sharply due to thermal runaway, short circuit, or other reasons, the pressure relief valve 70 will preferentially open, releasing the high-temperature, high-pressure gas and liquid inside the battery body 11, thereby reducing the internal pressure of the battery body 11 and preventing the battery body 11 from exploding. If the adhesive 40 intrudes between the battery body 11 and the bottom wall 22 of the housing 20, it will affect the opening of the pressure relief valve 70, causing serious consequences. Therefore, the adhesive 40 is not placed between the bottom of the pressure relief valve 70 and the bottom wall 22 of the housing 20 to prevent the filler 30 and / or the adhesive 40 from blocking the pressure relief valve 70 and to leave a pressure relief path for the ejected material in the pressure relief valve 70. However, at this time, the bonding area between the bottom end face 113 of the battery body 11 and the adhesive 40 becomes smaller, resulting in a decrease in bonding strength. Therefore, h can be increased, that is, the value of the ratio h / H is in the range of 0.1-0.5, so that the adhesive 40 covers more of the side of the battery body 11. While improving the bonding strength of the side of the battery body 11, it further prevents the filler 30 from intruding between the battery body 11 and the bottom wall 22 of the housing 20.

[0058] Preferably, the ratio h / H can range from 0.15 to 0.4. Alternatively, the ratio h / H can be 0.13, 0.2, 0.3, or 0.45.

[0059] Continue to refer to Figure 5The bottom wall 22 is provided with a pressure relief hole 71. An insulating pad 60 is provided between the bottom end face 113 of the battery body 11 and the bottom wall 22 of the housing 20. The insulating pad 60 has a channel 61 connecting the pressure relief valve 70 and the pressure relief hole 71, and the ratio h / H ranges from 0.15 to 0.5. The insulating pad 60 can maintain the insulation between the pressure relief valve 70 and the bottom wall 22 of the housing 20, and at the same time prevent the adhesive 40 from intruding into the channel 61 and the pressure relief hole 71, causing the pressure relief path of the pressure relief valve 70 to be blocked. The orthographic projection of the pressure relief valve 70 on the bottom wall 22 can fall completely into the orthographic projection of the channel 61 on the bottom wall 22. Therefore, the insulating pad 60 will not block the pressure relief valve 70, and the pressure relief valve 70 can be opened smoothly to release the high-temperature and high-pressure gas and liquid inside the battery body 11, thereby reducing the pressure inside the battery body 11. The bottom surface 113 of the battery body 11 is partially covered by the insulating pad 60, allowing the portion of the bottom surface 113 not covered by the insulating pad 60 to be bonded to the adhesive 40. Because the insulating pad 60 is provided between the bottom surface 113 of the battery body 11 and the bottom wall 22 of the casing 20, the bonding area between the adhesive 40 and the bottom surface 113 of the battery body 11 is reduced. Therefore, h can be increased, meaning the ratio h / H can range from 0.15 to 0.5, allowing the adhesive 40 to cover more of the side surface of the battery body 11, thus ensuring the connection strength between the battery 10 and the casing 20.

[0060] Preferably, the ratio h / H can range from 0.2 to 0.4. Alternatively, the ratio h / H can be 0.17, 0.25, 0.3, or 0.45.

[0061] refer to Figure 6 According to another embodiment of this disclosure, the bottom wall 22 of the housing 20 may be provided with a heat dissipation structure 80. The heat dissipation structure 80 makes the heat dissipation efficiency of the battery 10 higher. At this time, the heat dissipation requirements of the adhesive 40 can be reduced, and the contact area between the adhesive 40 and the battery 10 can be reduced. Therefore, the value range of the ratio h / H can be 0.05-0.4.

[0062] Preferably, the ratio h / H can range from 0.15 to 0.35. Alternatively, the ratio h / H can be 0.1, 0.2, 0.25, or 0.3.

[0063] To improve heat dissipation, the adhesive 40 can have a higher thermal conductivity than the filler 30. The adhesive 40 is in contact with both the battery 10 and the bottom wall 22 of the housing 20, transferring heat from the battery 10 to the housing 20 and dissipating it to the external environment, thus lowering the temperature of the battery 10. The adhesive 40 serves as a heat exchange medium between the battery 10 and the bottom wall 22 of the housing 20 and should therefore have a high thermal conductivity. Specifically, to ensure effective heat dissipation, the thermal conductivity of the adhesive 40 can range from 0.2 W / (m·K) to 3 W / (m·K).

[0064] Preferably, the thermal conductivity of the adhesive 40 can range from 0.5 W / (m·K) to 2.5 W / (m·K). Alternatively, the thermal conductivity of the adhesive 40 can be 0.7 W / (m·K), 1 W / (m·K), 1.5 W / (m·K), or 2 W / (m·K).

[0065] This disclosure does not impose any particular limitation on the heat dissipation structure 80, as long as it can improve heat dissipation efficiency. As an example, the heat dissipation structure 80 can be a flow channel provided in the bottom wall 22 of the housing 20, so as to remove the heat of the battery 10 by means of the cooling fluid flowing through it. In a more specific example, the bottom wall 22 of the housing 20 can be formed by sandwiching two metal plates, and the pipes of the flow channel can be provided between the two metal plates. In another example, the heat dissipation structure 80 can also be a heat dissipation fin formed on the outside of the bottom wall 22 of the housing 20.

[0066] <Example Electrical Equipment>

[0067] refer to Figure 7 This disclosure also provides an electrical device 200, which may include the battery device 100 described above.

[0068] By way of example only, electrical equipment 200 can include, but is not limited to, vehicles, ships, aircraft, household appliances, industrial equipment, etc. For example, vehicles can be passenger cars, trucks, engineering vehicles, etc.

[0069] In addition, electrical equipment 200 can be used for the storage, conversion and release of recyclable electrical energy.

[0070] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0071] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0072] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple batteries, each including a battery body; The housing contains the plurality of batteries and includes side walls and a bottom wall; A filler is disposed between the plurality of batteries and the sidewall and / or between adjacent batteries; as well as The adhesive, located on the bottom side of the filler, is disposed between the bottom wall and the bottom end face of the battery body and covers part of the side surface of the battery body, and has a larger elastic modulus than the filler. Wherein, the height of the side of the portion of the battery body that is covered is h, the height of the battery body is H, and the value of the ratio h / H ranges from 0.05 to 0.

5.

2. The battery device according to claim 1, characterized in that, The elastic modulus of the filler is in the range of 50MPa-1000MPa, and / or the elastic modulus of the adhesive is in the range of 100MPa-2000MPa.

3. The battery device according to claim 1, characterized in that, The bonding strength of the adhesive body ranges from 1 MPa to 40 MPa, and the ratio h / H ranges from 0.05 to 0.

3.

4. The battery device according to claim 1, characterized in that, The bottom surface of the battery body is provided with a pressure relief valve, and the adhesive is located between the part of the bottom surface of the battery body outside the pressure relief valve and the bottom wall, with the ratio h / H ranging from 0.1 to 0.

5.

5. The battery device according to claim 4, characterized in that, The bottom wall is provided with a pressure relief hole, and an insulating pad is provided between the bottom end face of the battery body and the bottom wall. The insulating pad is provided with a channel connecting the pressure relief valve and the pressure relief hole. The value range of the ratio h / H is 0.15-0.

5.

6. The battery device according to claim 1, characterized in that, The battery body includes a packaging body and an electrode body housed within the packaging body. The distance from the bottom end of the electrode body to the bottom end face of the battery body is g, where g ≥ h.

7. The battery device according to claim 6, characterized in that, The electrode body includes at least one diaphragm and at least two electrodes, two adjacent electrodes being separated by one of the at least two diaphragms, the bottom edge of any one of the at least two electrodes being higher than the bottom edge of the diaphragm, and the bottom end of the electrode body being defined by the bottom edge of the diaphragm.

8. The battery device according to claim 1, characterized in that, The battery also includes an electrode post disposed on the top of the battery body, and the top of the filler is lower than the top of the electrode post.

9. The battery device according to claim 8, characterized in that, The distance d between the top of the filler and the top of the pole is 0mm < d ≤ 5mm.

10. The battery device according to claim 1, characterized in that, The thermal conductivity of the adhesive is greater than that of the filler, and the thermal conductivity of the adhesive ranges from 0.2 W / (m·K) to 3 W / (m·K).

11. The battery device according to claim 1, characterized in that, The bottom wall is provided with a heat dissipation structure, and the ratio h / H ranges from 0.05 to 0.

4.

12. The battery device according to claim 1, characterized in that, The battery is a cylindrical battery, and the ratio h / H ranges from 0.05 to 0.

45.

13. The battery device according to claim 1, characterized in that, The filler is a foam, and the material of the foam is selected from polyurethane, silicone and acrylic.

14. The battery device according to claim 1, characterized in that, The adhesive is made of a material selected from polyurethane, acrylic, epoxy, and silicone.

15. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 14.

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