Battery device and electrical device

Abstract

Battery device, characterized in that it comprises: a plurality of batteries, each having a battery body; a housing that houses the plurality of batteries and has side walls and a bottom wall; a filler provided between the plurality of batteries and the side walls and / or between adjacent batteries; and an adhesive located on a bottom surface of the filler, provided between the bottom wall and the lower end surface of the battery body, and coated on a part of the side surface of the battery body, and having a modulus of elasticity greater than that of the filler, where 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 ratio “h / H” is in the range of 0.05 to 0.5.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of batteries, in particular to a battery device and an electrical device comprising this battery device. BACKGROUND

[0002] Some battery devices comprise a housing and multiple batteries housed within the housing. The batteries are typically firmly attached to the bottom wall of the housing, for example, by adhesive bonding. For specific purposes, such as insulation, thermal insulation, vibration damping, buffering, and compensation for volume changes during battery replacement, fillers such as foam may be provided between adjacent batteries and between the batteries and the side walls of the housing. However, this type of battery device has the problem of a loose connection between the batteries and the bottom wall of the housing. SUMMARY OF THE UTILITY MODEL

[0003] In view of the above, the present disclosure provides a battery device and an electrical device including the battery device, with the aim of improving at least the weak connection between the battery and the bottom wall of the housing.

[0004] One aspect of the present disclosure provides a battery device. The battery device includes a plurality of batteries, a casing, a filler, and an adhesive. Each battery includes a battery body. The casing accommodates the plurality of batteries and has 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 casing. The adhesive is located on the underside of the filler provided between the bottom wall of the casing and the lower end surface of the battery body and is coated on a part of the side wall of the battery body. The adhesive has a larger elastic modulus than 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 ratio "h / H" is in the range of 0.05 to 0.5.

[0005] Another aspect of the present disclosure also provides electrical equipment. The electrical equipment includes the battery device as described above.

[0006] According to the battery device and the electrical equipment of the present disclosure, the adhesive is disposed between the bottom wall of the casing and the lower end surface of the battery body and coated on a part of the side surface of the battery body, so that the filler with a smaller elastic modulus cannot easily penetrate between the bottom wall of the casing and the lower end surface of the battery body, and the fixed connection between the battery and the bottom wall of the casing is realized by the adhesive with a larger elastic modulus, which contributes to improving the strength of the connection between the battery and the bottom wall of the casing. Based on this, the value range of the ratio "h / H" of the height "h" of the part of the side surface of the battery body coated with the adhesive to the height "H" of the battery is limited to a suitable range of 0.05 to 0.5. If the ratio "h / H" is too small, that is,If the ratio "h / H" is less than 0.05, the filler easily penetrates between the bottom wall of the case and the lower end face of the battery body, thereby compromising the strength of the connection between the battery and the bottom wall of the case. If the ratio "h / H" is too large, that is, greater than 0.5, the adhesive with a larger elastic modulus (that is, not easily deformed) will cause excessive extrusion of the battery body when the battery body expands, and this extrusion is likely to damage the electrode body inside the battery body. Limiting the value range of the "h / H" ratio to 0.05 to 0.5 can effectively prevent the filler from penetrating the bottom wall of the case and the lower end face of the battery body (which would result in loose connection) and the electrode body from being crushed. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] It is understood that the following figures illustrate only certain embodiments of the present disclosure and should not be considered as limiting the scope of application.

[0008] It should be understood that the same or similar reference numbers are used in the figures to represent the same or similar elements.

[0009] It is understood that the figures are only schematic and the sizes and proportions of the elements in the figures are not necessarily exact. Fig. 1 is a schematic structural diagram of a battery device according to an embodiment of the present disclosure. Fig. 2 is a schematic exploded view of the battery device in Fig. 1. Fig. 3 is a schematic cross-sectional view along the line “AA” in Fig. 1. Fig. 4 is a schematic cross-sectional view of the battery in Fig. 3. Fig. 5 is a schematic cross-sectional view of a battery device according to another embodiment of the present disclosure. Fig. 6 is a schematic cross-sectional view of a battery device according to another embodiment of the present disclosure. Fig. 7 is a schematic structural diagram of an electrical device according to an embodiment of the present disclosure.

[0010] In the figures: 100, Battery device; 10, Battery; 11, Battery body; 111, Packaging body; 112, Electrode body; 1121, Separator; 1122, Electrode; 113, Lower end face of battery body; 114, Tab; 12, Terminal post; 20, Casing; 21, Top wall of casing; 22, Bottom wall of casing; 23, Side wall of casing; 30, Filler; 40, Adhesive; 50, Electrical connector; 60, Insulating pad; 61, Duct; 70, Pressure relief valve; 71, Pressure relief hole; 80, Heat dissipation structure; 200, Electrical equipment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] Many specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described in the specification and illustrated in the drawings. It should be understood that the embodiments described and illustrated herein are non-limiting examples, so it can be appreciated that the specific structural and functional details disclosed herein may be representative and exemplary. These embodiments are subject to modification and change without departing from the scope of the claims.

[0012] Conventional battery devices have the problem that the fixed connection between the battery and the bottom wall of the case is not strong enough. The inventors found that the main reason for this problem is the intrusion of the filler between the bottom end surface of the battery and the bottom wall of the case. In order to fulfill functions such as insulation, heat insulation, vibration absorption, buffering, and compensation for volume changes during battery replacement, a low elastic modulus material such as foam is usually used for the filler, and this type of filler can hardly help the battery form a firm connection with the bottom wall of the case. Therefore, the intrusion of the filler between the bottom end surface of the battery and the bottom wall of the case leads to the problem of an insufficiently fastened connection between the battery and the bottom wall of the case.

[0013] For illustration, a battery device with a foam is used as an example. During assembly, the uncured adhesive is usually first applied to the bottom wall of the case, and then the battery is placed on the bottom wall of the case and fixed to the bottom wall of the case by the adhesive. It takes a long time for the adhesive to fully cure. In order to make manufacturing more efficient, the foam is often filled between a plurality of batteries and the side walls of the case and / or between the plurality of batteries when the adhesive is not yet fully cured. After filling, the volume of the foam increases and cures at the same time, which may cause the foam to displace the uncured adhesive and then penetrate between the battery and the bottom wall of the case.

[0014] To solve the problem that the connection between the battery and the bottom wall of the case is not strong enough due to the penetration of the filler between the lower end surface of the battery and the bottom wall of the case, the present disclosure provides a battery device and an electrical device including the battery device. The battery device and the electrical device of the present disclosure are described below with reference to specific embodiments. <Exemplarische Batterievorrichtung>

[0015] One embodiment of the present disclosure provides a battery device 100. For clarity, the general structure of the battery device 100 is first presented below. It should be understood that the structure of the battery device 100 is not limited to the following description. For example, one or more of the elements presented below may be omitted or replaced, and the arrangement of the described elements may also be changed.

[0016] With reference to the Fig. 1 and Fig. 2, the battery device 100 includes a plurality of batteries 10, a housing 20, a filler 30, and an adhesive 40.

[0017] Battery 10 is a storage unit that can be repeatedly discharged, which can be interpreted as the concept of a "secondary battery." In the present 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-hydrogen batteries.

[0018] As in Fig. 3, the battery 10 may have a battery body 11. As shown in Fig. As shown in Figure 4, the battery body 11 may include a casing body 111 and one or more electrode bodies 112 housed within the casing body 111. Depending on the structure of the casing body 111, the battery 10 may be a cylindrical battery, a prismatic battery, a pocket battery, or another type of battery.

[0019] As from Fig. 3, the battery 10 may also include a terminal post 12 located at one end of the battery body 11. The battery device 100 may further include an electrical connector 50 that can be connected to the terminal post 12, e.g., by welding, to connect the plurality of batteries 10 in parallel or in series, thus helping the battery device 100 to determine a sufficient capacity and operating voltage (see Fig. 2 and Fig. 3).

[0020] In the present disclosure, one end of the battery body 11 provided with the terminal post 12 may be referred to as the upper end, and the other end opposite the upper end may be referred to as the lower end. Regarding the battery 10 as a whole, the lower end of the battery body 11 may be the lower end of the battery 10, and the upper end of the terminal post 12 may be the upper end of the battery 10.

[0021] The direction from the top end to the bottom end of the battery body 11 and the direction from the bottom end to the top end of the battery body 11 may collectively be referred to as the height direction. The height of a particular element may refer to the dimension of the element in the height direction.

[0022] For clarity, the height direction is indicated by the arrows "Z+" and "Z-" in the attached drawings. The arrow "Z+" indicates the direction from the bottom to the top of the battery body 11, and the arrow "Z-" indicates the direction from the top to the bottom of the battery body 11.

[0023] It should be noted that in the present disclosure, the direction from the top to the bottom of the battery body 11 does not necessarily coincide with the direction of gravity. Depending on the placement of the battery device 100 during use, the direction from the top to the bottom of the battery body 11 may coincide with, be opposite to, oblique to, or orthogonal to the direction of gravity. The present disclosure does not impose any particular restrictions on the placement of the battery device 100 during use.

[0024] As can be seen from the Fig. 2 and Fig. 3, the housing 20 can accommodate a plurality of batteries 10 to provide protection and support to the plurality of batteries 10. The housing 20 can have a plurality of wall portions 21, 22, and 23. The wall portion 21 and the wall portion 22 are opposite each other in the height direction, the wall portion 21 is located on the top side of the battery 10, and the wall portion 22 is located on the bottom side of the battery 10. That is, the battery 10 is located between the wall portion 21 and the wall portion 22, and the direction from the wall portion 21 to the wall portion 22 corresponds to the direction from the top to the bottom of the battery 10. The wall portion 23 is located between the wall portion 21 and the wall portion 22, and the plurality of wall portions 21, 22, and 23 are enclosed together to form the internal space of the housing 20.For simplicity, the wall section 21 is referred to as the top wall, the wall section 22 as the bottom wall and the wall section 23 as the side wall.

[0025] When describing the relative positional relationship between two elements below, directional terms such as "higher" and "lower" are intended. For example, the first element is higher than the second element, which means that the first element is closer to the top wall 21 of the housing 20 in the height direction than the second element. Conversely, the first element is lower than the second element, which means that the first element is closer to the bottom wall 22 of the housing 20 in the height direction than the second element.

[0026] As in Fig. As shown in Figure 3, the filler 30 is located between the plurality of batteries 10 and the sidewall 21 and / or between adjacent batteries 10. The filler 30 may have a lower elastic modulus to positively impact vibration absorption, buffering, and compensation for volume changes during battery changes. The filler 30 may also have better insulation performance to perform an insulating function and prevent short circuits between the batteries 10. The filler 30 may also have low thermal conductivity to prevent thermal runaway of adjacent batteries 10 when a single battery 10 is in thermal runaway.

[0027] The filler 30 can be, for example, a foam. The foam has a low elastic modulus and can effectively implement functions such as vibration absorption, buffering, and compensation for volume changes during battery cycling. Furthermore, the insulating properties of the foam can prevent adjacent batteries 10 and direct contact between the battery 10 and the housing, thus avoiding the risk of a short circuit. Furthermore, the foam has low thermal conductivity, which can delay the diffusion of heat to adjacent batteries 10 if a single battery 10 causes thermal runaway due to a fault, thereby reducing the risk of a chain-like thermal runaway. Furthermore, the foam is lightweight and does not significantly increase the overall mass of the battery device 100.

[0028] For example, the foam can be made of polyurethane, silicone, or acrylic. The foam can also be a hybrid combination of the above-mentioned materials. The advantages of polyurethane, silicone, and acrylic materials include good shock resistance, insulation, and thermal insulation.

[0029] As in Fig. 3, the adhesive 40 is located on the underside of the filler 30 to adhere the battery 10 to the case 20 so that the battery 10 is held in a fixed position relative to the case 20. The adhesive 40 may have a relatively large elastic modulus, and its elastic modulus should be larger than the elastic modulus of the filler 30. The adhesive 40 with a large elastic modulus can establish a stronger connection between the battery 10 and the case 20. The adhesive 40 may also have better insulation performance to perform an insulating function and prevent short circuits between the batteries 10.

[0030] The material of the adhesive 40 can be at least one of the following: polyurethane, acrylic, epoxy, and silicone. The adhesive 40 can also be a hybrid combination of the above materials. The advantages of polyurethane, acrylic, epoxy, and silicone are: good adhesion, insulation performance, resistance to breakage during use, and a long service life.

[0031] As from Fig. As shown in Fig. 3, the adhesive 40 is disposed between the bottom wall 22 of the casing 20 and the lower end surface 113 of the battery body 11 and coated on a part of the side of the battery body 11. Here, the height of the part of the side of the battery body coated with the adhesive 40 is "h," the height of the battery body 11 is "H," and the ratio "h / H" is in the range of 0.05 to 0.5.

[0032] The adhesive 40 is disposed between the bottom wall 22 of the casing 20 and the lower end surface 113 of the battery body 11 and coated on a part of the side wall of the battery body 11, so that the filler 30 with a smaller elastic modulus cannot easily penetrate between the bottom wall 22 of the casing 20 and the lower end surface 113 of the battery body 11. The fastened connection between the battery 10 and the bottom wall 22 of the casing 20 is realized by the adhesive 40 with a larger elastic modulus, thereby improving the strength of the connection between the battery 10 and the bottom wall 22 of the casing 20. Based on this, the value range of the ratio "h / H" of the height h of the side portion of the battery body 11 coated with the adhesive 40 to the height "H" of the battery body 11 is limited to a suitable range of 0.05 to 0.5. If the ratio “h / H” is too small, ieless than 0.05, the filler 30 easily penetrates between the bottom wall 22 of the casing 20 and the lower end surface 113 of the battery body 11, thereby deteriorating the strength of the connection between the battery 10 and the bottom wall 22 of the casing 20. If the ratio “h / H” is too large, that is, greater than 0.5, the adhesive 40 having a large elastic modulus (that is, not easily deformed) will cause excessive extrusion of the battery body 11 when the battery body 11 expands, and this extrusion is likely to damage the internal structure of the battery body 11, causing the battery 10 to fail or lose control.By limiting the value range of the ratio “h / H” to 0.05 to 0.5, the adhesive 40 can effectively prevent the loose connection caused by the penetration of the filler 30 into the bottom wall 22 of the casing 20 and the lower end surface 113 of the battery body 11, and also avoid damage to the internal structure of the battery body 11.

[0033] Preferably, the "h / H" ratio can be in the range of 0.25 to 0.4. Furthermore, the "h / H" ratio can optionally be 0.1, 0.15, 0.2, 0.3, 0.35, or 0.45, etc.

[0034] The elastic modulus of the filler 30 should be limited to an appropriate range. If the elastic modulus of the filler 30 is too small, the filler 30 will deform even under very low loads and will not be able to adequately support the plurality of batteries 10 laterally. When the battery device 100 is impacted, the filler 30 will hardly be able to fulfill its buffer and energy absorption functions. If the elastic modulus of the filler 30 is too large, the filler 30 will be difficult to deform under the expansion force of the battery 10, and the compressive force may damage the structure of the battery 10. For this reason, the elastic modulus of the filler 30 can be between 50 MPa and 1000 MPa.By limiting the elastic modulus of the filler 30 to this range of values, the filler 30 can not only fulfill the function of buffering and absorbing energy for the plurality of batteries 10, but also leave room for the volume change of the battery 10 after expansion, thereby avoiding damage to the internal structure of the battery body 11.

[0035] Preferably, the elastic modulus of the filler 30 can be between 150 MPa and 800 MPa. Furthermore, the elastic modulus of the filler 30 can optionally 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.

[0036] 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 is easily deformed and cannot stably hold and fix the battery 10. If the elastic modulus of the adhesive 40 is too large, the adhesive 40 is easily separated from the battery 10 and the casing 20 upon impact, resulting in a loose connection between the battery 10 and the casing 20. For this reason, the elastic modulus of the adhesive 40 can be in the range of 100 MPa to 2000 MPa. By limiting the elastic modulus of the adhesive 40 to this range, the adhesive 40 can provide stable support for the battery 10 and establish a firm connection between the battery 10 and the casing 20.

[0037] Preferably, the elastic modulus of the adhesive 40 can be in the range of 500 MPa to 1500 MPa. Furthermore, the elastic modulus of the adhesive 40 can optionally be 200 MPa, 400 MPa, 600 MPa, 800 MPa, 1000 MPa, 1200 MPa, 1400 MPa, 1600 MPa, or 1800 MPa.

[0038] To ensure sufficient bonding strength between the battery 10 and the casing 20 at a small "h / H," the adhesive 40 should have a higher bonding strength. Accordingly, in some examples, the bonding strength of the adhesive 40 may be in the range of 1 MPa to 40 MPa, and the "h / H" ratio may further be in the range of 0.05 to 0.3. Thus, the adhesive 40 with higher bonding strength can ensure sufficient bonding strength between the battery 10 and the casing 20. In addition, a lower "h / H" can be determined to prevent the internal structure of the battery body 11 from being crushed and damaged by the adhesive 40. Limiting the bonding strength of the adhesive 40 to this range also takes into account the strength of the battery device 100 and the prevention of crushing of the battery 10.

[0039] Preferably, the bond strength of the adhesive 40 may be in the range of 10 MPa to 30 MPa. Furthermore, the bond strength of the adhesive 40 may optionally be 5 MPa, 15 MPa, 20 MPa, 25 MPa, or 35 MPa.

[0040] Preferably, the "h / H" ratio can be between 0.1 and 0.2. Furthermore, the "h / H" ratio can be 0.08, 0.13, 0.15, 0.18, 0.23, 0.25, or 0.28.

[0041] According to Fig. 4, the battery body 11 includes a casing body 111 and an electrode body 112 housed in the casing body 111, and the distance between the lower end of the electrode body 112 and the lower end surface 113 of the battery body 11 is "g", where g≥h is satisfied. That is, the upper surface of the adhesive 40 is not higher than the lower end of the electrode body 112, and there is basically no overlap in the height direction. The expansion of the battery 10 during cycling is mainly due to the expansion of the electrode body 112. If the top of the adhesive 40 is higher than the bottom of the electrode body 112, then during the expansion of the battery 10, the overlapping part of the electrode body 112 and the adhesive 40 is compressed in the height direction by the adhesive 40, which may lead to crushing of the electrode body 112 in severe cases.Satisfying g≥h can effectively prevent the electrode body 112 from being crushed when it expands during charging.

[0042] With reference to Fig. 4, the electrode body 112 includes at least one separator 1121 and at least two electrodes 1122. The polarities of the two adjacent electrodes 1122 are opposite; one is a positive electrode and the other is a negative electrode. The two adjacent electrodes 1122 are separated from each other by a separator 1121 to prevent them from directly touching each other and causing a short circuit. Each electrode 1122 includes a current collector and an active material coated on the current collector. Compressing the electrode 1122 may cause the active material to fall off, thereby deteriorating the performance of the battery 10 or even causing failure. According to the embodiment of the present disclosure, the lower edge of one of the two electrodes 1122 is higher than the lower edge of the separator 1121, and the lower end of the electrode body 112 is defined by the lower edge of the separator 1121.Accordingly, the top surface of the adhesive 40 is not higher than the bottom edge of the separator 1121, and the bottom edge of each electrode 1122 is higher than the bottom edge of the separator 1121, so that each electrode 1122 is not squeezed by the adhesive 40 and the risk of active material falling off therefrom is also reduced.

[0043] As in Fig. 3, the battery 10 also includes a terminal post 12 disposed on top of the battery body 11. The terminal post 12 can be electrically connected to the electrode body 112 and to the electrical connector 50 inside the housing 20 via the tab 114. The top surface of the filler 30 is lower than the top surface of the terminal post 12. In other words, the terminal post 12 is not completely submerged in the filler 30. The portion of the terminal post 12 on the outside of the filler 30 can be connected to the electrical connector 50 inside the housing 20.

[0044] In particular, the range of values ​​for the distance “d” between the top of the filler 30 and the top of the terminal post is 12 0 mm <d≤5 mm. Der Abstand zwischen der Oberseite des Füllstoffs 30 und der Oberseite des Terminalpfostens 12 sollte innerhalb eines geeigneten Bereichs liegen. Wenn der Abstand „d“ zwischen der Oberseite des Füllstoffs 30 und der Oberseite des Terminalpfostens 12 zu groß ist, d. h. der Abschnitt der Batterie 10, der von dem Füllstoff 30 umhüllt wird, ist klein, und der Füllstoff 30 kann nur schwer eine Isolierung zwischen der Vielzahl von Batterien 10 erreichen; dies führt zu einer Verschlechterung der Wärmeisolationswirkung. Im Falle eines thermischen Durchgehens ist es wahrscheinlicher, dass eine Batterie 10 ein thermisches Durchgehen benachbarter Batterien auslöst, was zu einer Wärmeausbreitung führt und die Sicherheit der Batterievorrichtung 100 ernsthaft beeinträchtigt.If the distance "d" between the top surface of the filler 30 and the top surface of the terminal post 12 is too small, that is, the portion of the battery 10 wrapped by the filler 30 is large, and the filler 30 with low thermal conductivity will impair the heat dissipation of the battery 10. In addition, if more materials are used for the filler 30 and it is more expensive, the overall weight of the battery device 100 increases. Therefore, the distance "d" between the top surface of the filler 30 and the top surface of the terminal post 12 can be within the above-mentioned range, whereby the plurality of batteries 10 can be ensured to be insulated and thermally insulated from each other, and cost and weight reduction can be achieved.

[0045] Preferably, the distance "d" between the top surface of the filler 30 and the top surface of the terminal post 12 may be in the range of 1 mm≤d≤4 mm. Furthermore, the distance "d" between the top surface of the filler 30 and the top surface of the terminal post 12 may be 0.5 mm, 1.5 mm, 2 mm, or 3 mm.

[0046] In a specific example, the battery 10 may be a cylindrical battery. Since the cylindrical battery expands more after charging or heating, the "h / H" ratio should be smaller to ensure that the electrode body 112 of the cylindrical battery is not squeezed by the adhesive 40. However, if the "h / H" ratio is too small, the connection strength between the cylindrical battery and the casing 20 cannot be ensured. Therefore, the "h / H" ratio may be in the range of 0.05 to 0.45. The "h / H" ratio is set within the above range to ensure the connection strength between the cylindrical battery and the casing 20 while the adhesive 40 does not squeeze the electrode body 112 of the cylindrical battery.

[0047] Preferably, the "h / H" ratio can be in the range up to 0.4. Furthermore, the "h / H" ratio can optionally be 0.1, 0.2, 0.3, or 0.35.

[0048] According to another embodiment of the present disclosure (see Fig. 5) The lower end surface 113 of the battery body 11 is provided with a pressure relief valve 70. The adhesive 40 may be disposed between the lower end surface 113 of the battery body 11 outside the pressure relief valve 70 and the bottom wall 22. That is, the adhesive 40 is not provided between the pressure relief valve 70 and the bottom wall 22. In the present embodiment, the range of the ratio "h / H" must be further set to 0.1 to 0.5. The pressure relief valve 70 at the bottom of the battery body 11 serves to explode first in the event of excessive internal pressure in the event of thermal runaway or other abnormal conditions of the battery 10 and to direct the direction of pressure relief, thereby preventing an uncontrolled explosion of the battery 10.When the pressure inside the battery increases sharply due to thermal runaway, short circuit, or other reasons, the pressure relief valve 70 will explode first, releasing the high-temperature and high-pressure gas and liquid inside the battery body 11, thereby reducing the pressure inside the battery body 11 and preventing the battery body 11 from exploding. The intrusion of the adhesive 40 between the battery body 11 and the bottom wall 22 of the casing 20 would interfere with the opening of the pressure relief valve 70, resulting in serious consequences. Therefore, the adhesive 40 is not provided between the bottom of the pressure relief valve 70 and the bottom wall 22 of the casing 20 to prevent the filler 30 and / or the adhesive 40 from blocking the pressure relief valve 70 and leaving a pressure relief path for the discharged material in the pressure relief valve 70.In this case, however, the area between the lower end surface 113 of the battery body 11 and the adhesive 40 becomes smaller, resulting in a decrease in the bonding strength. Therefore, "h" can be increased, that is, the ratio "h / H" is in the range of 0.1 to 0.5, so that the adhesive 40 covers more sides of the battery body 11 while improving the bonding strength of the sides of the battery body 11, and further preventing the filler 30 from penetrating between the battery body 11 and the bottom wall 22 of the case 20.

[0049] Preferably, the "h / H" ratio can be in the range of 0.15 to 0.4. Furthermore, the "h / H" ratio can optionally be 0.13, 0.2, 0.3, or 0.45.

[0050] In Fig. 5, the bottom wall 22 is provided with a pressure relief hole 71, and an insulating pad 60 is provided between the lower end surface 113 of the battery body 11 and the bottom wall 22 of the casing 20. The insulating pad 60 is provided with a channel 61 connecting the pressure relief valve 70 and the pressure relief hole 71, and the ratio "h / H" is in the range of 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 casing 20, while preventing the adhesive 40 from penetrating the channel 61 and the pressure relief hole 71, thereby blocking the pressure relief path of the pressure relief valve 70. The positive projection of the pressure relief valve 70 on the bottom wall 22 can fall completely into the positive 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 smoothly burst open, releasing the high-temperature and high-pressure gases and liquids within the battery body 11, thereby reducing the pressure within the battery body 11. The lower end surface 113 of the battery body 11 is partially covered by the insulating pad 60, so that the portion of the lower end surface 113 not covered by the insulating pad 60 can be bonded with the adhesive 40. Since the insulating pad 60 is provided between the lower end 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 lower end surface 113 of the battery body 11 is reduced. Therefore, "h" can be increased, that is,the ratio “h / H” is in the range of 0.15 to 0.5, so that the adhesive 40 is coated on more sides of the battery body 11 to ensure the bonding strength between the battery 10 and the casing 20.

[0051] Preferably, the "h / H" ratio can be in the range of 0.2 to 0.4. Furthermore, the "h / H" ratio can be optionally 0.17, 0.25, 0.3, or 0.45.

[0052] According to Fig. 6, according to another embodiment of the present disclosure, the bottom wall 22 of the housing 20 may be provided with a heat dissipation structure 80. The heat dissipation structure 80 makes heat dissipation of the battery 10 more efficient. In this case, the heat dissipation requirements of the adhesive 40 can be reduced, and the area where the adhesive 40 comes into contact with the battery 10 can be reduced. Therefore, the value range of the ratio "h / H" can be 0.05 to 0.4.

[0053] Preferably, the value range of the "h / H" ratio can be 0.15 to 0.35. Furthermore, the "h / H" ratio can optionally be 0.1, 0.2, 0.25, or 0.3.

[0054] To improve heat dissipation, the adhesive 40 may have a higher thermal conductivity compared to the thermal conductivity of the filler 30. The adhesive 40 is in contact with the battery 10 and the bottom wall 22 of the housing 20 at the same time, allowing the heat of the battery 10 to be transferred to the housing 20 and dissipated to the outside environment, thus reducing the temperature of the battery 10. The adhesive 40 may be used as a heat exchange medium between the battery 10 and the bottom wall 22 of the housing 20, which should have a higher thermal conductivity. To ensure heat dissipation, the thermal conductivity of the adhesive 40 may, in particular, be in the range of 0.2 W / (m·K) to 3 W / (m·K).

[0055] Preferably, the thermal conductivity of the adhesive 40 may be in the range of 0.5 W / (m·K) to 2.5 W / (m·K). Furthermore, the thermal conductivity of the adhesive 40 may optionally be 0.7 W / (m·K), 1 W / (m·K), 1.5 W / (m·K), or 2 W / (m·K).

[0056] The present disclosure does not specifically limit the heat dissipation structure 80 as long as the heat dissipation efficiency can be improved. For example, the heat dissipation structure 80 may be a flow channel provided in the bottom wall 22 of the housing 20 to dissipate the heat of the battery 10 by means of the cooling liquid flowing therethrough. In a more specific example, the bottom wall 22 of the housing 20 may be formed of two layers of metal plates, and the piping of the flow channel may be provided between the two layers of metal plates. In another example, the heat dissipation structure 80 may also be a heat dissipation fin formed on the outer side of the bottom wall 22 of the housing 20. <Exemplarische elektrische Geräte>

[0057] An embodiment of the present disclosure also provides an electrical device 200 that may include the battery device 100 described above (see Fig. 7).

[0058] The electrical device 200 may be, for example, but is not limited to, a vehicle, a ship, an aircraft, a household appliance, an industrial device, etc. The vehicle may be, for example, a car, a truck, a technical vehicle, etc.

[0059] In addition, the electrical equipment 200 can be used to store, convert, and deliver cyclic electrical energy.

[0060] It is understood that multiple components and / or parts may be provided by a single integrated component or part. Alternatively, a single integrated component or part may be divided into multiple separate components and / or parts. When "a" or "an" is used in the disclosure to describe a component or part, this does not exclude other components or parts.

[0061] The above describes the basic principles of the present disclosure in combination with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations. These advantages, strengths, effects, etc. should not be assumed to be required for every embodiment of the present disclosure. Furthermore, the above specific details are provided for illustrative and better understanding only, not for limitation. The above details do not limit the present disclosure, which can be implemented by adopting the above specific details.

[0062] The above are only specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto. Those skilled in the art can readily conceive modifications or substitutions within the technical field disclosed in the present disclosure, which should be covered by the scope of the present disclosure. Therefore, the scope of the present disclosure is based on the scope of the claims.

Claims

[1] Battery device, characterized by that it has the following: a plurality of batteries, each having a battery body; a housing that houses the plurality of batteries and has side walls and a bottom wall; a filler provided between the plurality of batteries and the side walls and / or between adjacent batteries; and an adhesive located on a bottom surface of the filler, provided between the bottom wall and the lower end surface of the battery body, and coated on a part of the side surface of the battery body, and having a modulus of elasticity greater than that of the filler, where 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 ratio “h / H” is in the range of 0.05 to 0.

5. [2] Battery device according to claim 1, characterized bythat the elastic modulus of the filler is in the range of 50 MPa to 1000 MPa and / or the elastic modulus of the adhesive is in the range of 100 MPa to 2000 MPa. [3] Battery device according to one of the preceding claims, characterized by that the bond strength of the adhesive is in the range of 1 MPa to 40 MPa and the ratio “h / H” is in the range of 0.05 to 0.

3. [4] Battery device according to one of the preceding claims, characterized by that a pressure relief valve is provided on the lower end surface of the battery body, the adhesive is provided between the lower end surface of the battery body outside the pressure relief valve and the bottom wall, and the ratio "h / H" is in the range of 0.1 to 0.

5. [5] Battery device according to claim 4, characterized bythat a pressure relief hole is provided on the bottom wall, an insulating pad is provided between the lower end surface 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, and the ratio "h / H" is in the range of 0.15 to 0.

5. [6] Battery device according to one of the preceding claims, characterized by that the battery body has a casing body and an electrode body accommodated in the casing body, and the distance from the lower end of the electrode body to the lower end surface of the battery body is "g", where g≥h is satisfied. [7] Battery device according to claim 6, characterized bythat the electrode body has at least one separator and at least two electrodes, two adjacent electrodes of the at least two electrodes are separated by one of the at least one separator, the lower edge of any one of the at least two electrodes is higher than the lower edge of the separator, and the lower end of the electrode body is defined by the lower edge of the separator. [8] Battery device according to one of the preceding claims, characterized by that the battery further comprises a terminal post provided on the top of the battery body, and that the top of the filler is lower than the top of the terminal post. [9] Battery device according to claim 8, characterized by that the distance “d” between the top of the filler and the top of the terminal post has a range of values ​​from 0mm <d≤5mm hat. [10] Battery device according to one of the preceding claims, characterized by that the thermal conductivity of the adhesive is greater than the thermal conductivity of the filler and the thermal conductivity of the adhesive has a value range of 0.2 W / (m·K) to 3 W / (m·K). [11] Battery device according to one of the preceding claims, characterized by that the bottom wall is provided with a heat dissipation structure and the ratio “h / H” is in the range of 0.05 to 0.

4. [12] Battery device according to one of the preceding claims, characterized by that the battery is a cylindrical battery and the ratio “h / H” is in the range of 0.05 to 0.

45. [13] Battery device according to one of the preceding claims, characterized by that the filler is a foam and the material of the foam is selected from polyurethane, silicone and acrylic. [14] Battery device according to one of the preceding claims, characterized by that the material of the adhesive is selected from polyurethane, acrylic, epoxy and silicone. [15] An electrical device, characterized by that it comprises a battery device according to one of claims 1 to 14. [16] An electrical device according to claim 15, wherein the electrical device is a vehicle, a ship, an aircraft, a household appliance or an industrial device. [17] Electrical device according to claim 15, wherein the electrical device is a vehicle, and wherein the vehicle is a car or a truck.

Images