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, an electric connecting piece, a box body and a heat conductor, the electric connecting piece is arranged on the top sides of the plurality of batteries and is electrically connected with the plurality of batteries; the box body accommodates a plurality of batteries and electrical connectors and comprises a top wall. And the heat conductor is filled in the box body, is in contact with the top wall of the box body and wraps the top surface and the side surface of the electric connecting piece. The value range of the heat conductivity coefficient of the heat conductor is 0.2 W / (m.K)-3.5 W / (m.K). Therefore, the heat conductor can quickly transfer the heat on the electric connecting piece to the top wall of the box body, and the heat is dissipated through the top wall of the box body, so that the safety problems of thermal runaway and the like of the battery device due to the fact that the heat is concentrated in the box body are avoided.

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] Battery devices, used for storing and supplying electrical energy, are widely used in various equipment. Some battery devices consist of a housing and multiple batteries, which are connected in series or parallel via electrical connectors. However, these types of battery devices are prone to overheating and have difficulty dissipating heat during charging and discharging. If heat dissipation is not addressed promptly, it can lead to safety issues such as thermal runaway. Utility Model Content

[0003] In view of this, the present disclosure provides a battery device and an electrical device having the same, which aims to at least improve the problem of poor heat dissipation of the battery device.

[0004] In one aspect, this disclosure provides a battery device. The battery device includes a plurality of batteries, electrical connectors, a housing, and a heat conductor. The electrical connectors are disposed on the top side of the plurality of batteries and are electrically connected to the plurality of batteries. The housing houses the plurality of batteries and the electrical connectors, and includes a top wall. The heat conductor fills the housing, contacts the top wall of the housing, and covers the top and side surfaces of the electrical connectors. The thermal conductivity of the heat conductor ranges from 0.2 W / (m·K) to 3.5 W / (m·K).

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

[0006] According to the battery device and electrical equipment provided in this disclosure, by filling the housing with a thermal conductivity of 0.2 W / (m·K)-3.5 W / (m·K), and by contacting the thermal conductor with the top wall of the housing and covering the top and sides of the electrical connectors, the thermal conductor can quickly transfer the heat from the electrical connectors to the top wall of the housing for heat dissipation, thereby avoiding heat concentration inside the housing and preventing safety issues such as thermal runaway of the battery device. 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 1This is a schematic diagram of a battery device according to an embodiment of the present disclosure.

[0011] Figure 2 for Figure 1 A schematic diagram showing the exploded structure of some elements of the battery device.

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

[0013] Figure 4 This is a schematic cross-sectional view according to another embodiment of the present disclosure.

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

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

[0016] Figure 7 This is a schematic cross-sectional view of a battery according to an embodiment of the present disclosure.

[0017] Figure 8 This is a schematic cross-sectional view according to another embodiment of the present disclosure.

[0018] Figure 9 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0019] Explanation of reference numerals in the attached drawings: 100, battery assembly; 10, battery; 11, battery body; 111, packaging; 112, electrode; 1121, separator; 1122, electrode plate; 12, terminal post; 20, electrical connector; 30, housing; 31, top wall; 32, bottom wall; 33, side wall; 40, heat conductor; 50, support; 60, filler; 70, adhesive; 200, electrical equipment. Detailed Implementation

[0020] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. 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.

[0021] Battery devices with multiple batteries inside the casing often suffer from overheating and poor heat dissipation.

[0022] The inventors discovered that the cause of the above problems is that during the charging and discharging process of the battery device, a large amount of current passes through the electrical connectors, causing the connectors to easily generate a lot of heat. Since both the battery and the electrical connectors are placed inside the casing, the heat concentrates inside the casing and is difficult to dissipate.

[0023] To address the aforementioned problems, the inventors made numerous attempts and ultimately creatively proposed the following technical solution: A thermally conductive material with a thermal conductivity of 0.2 W / (m·K)–3.5 W / (m·K) is filled inside the casing. This material covers the electrical connectors and contacts the top wall of the casing. Accordingly, the thermally conductive material can quickly transfer heat from the electrical connectors to the casing for heat dissipation, thus preventing heat concentration inside the casing and avoiding safety issues such as thermal runaway of the battery device.

[0024] <Exemplary battery device>

[0025] This disclosure provides a battery device 100. For ease of understanding, the overall structure of the battery device 100 according to this disclosure 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 introduced below may be omitted or replaced, and their layout relationships may be changed.

[0026] refer to Figure 1 and Figure 2 The battery device 100 may include a battery 10, an electrical connector 20, a housing 30, and a heat conductor 40.

[0027] Battery 10 is an energy storage unit capable of repeated charging and discharging, and 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.

[0028] refer to Figure 3 The battery 10 may include a battery body 11. Combined with... Figure 7 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.

[0029] 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 reference) Figure 2 and Figure 3 Electrical connector 20 can be connected to terminal 12, for example by welding, to connect multiple batteries 10 in parallel or series, thereby helping the battery device 100 obtain sufficient capacity and operating voltage.

[0030] In this disclosure, the end of the battery body 11 with the terminal post 12 can be referred to as the top end, and the other end opposite the top end can be referred to as the bottom end. 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, 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 30 can accommodate multiple batteries 10, providing them with protection and support. The housing 30 may include multiple walls 31, 32, and 33. Walls 31 and 32 are opposite each other in the height direction, with wall 31 located at the top of the battery 10 and wall 32 located at the bottom. That is, the battery 10 is located between walls 31 and 32, and the direction from wall 31 to wall 32 is the same as the direction from the top to the bottom of the battery 10. Wall 33 is located between walls 31 and 32, and the multiple walls 31, 32, and 33 together form the internal space of the housing 30. For ease of description, wall 31 will be referred to as the top wall, wall 32 as the bottom wall, and wall 33 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 31 of the housing 30 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 32 of the housing 30 in the vertical direction than the second element.

[0035] Continue to refer to Figure 3 The heat conductor 40 is filled inside the housing 30 and is in contact with the top wall 31. For example, the heat conductor 40 can be filled in the top of the housing 30. The top of the housing 30 can refer to 50% of the space inside the housing 30 near the top wall 31, or it can refer to 30% of the space inside the housing 30 near the top wall 31.

[0036] The heat conductor 40 can cover the top and side surfaces of the electrical connector 20 and has a relatively high thermal conductivity, specifically, the thermal conductivity of the heat conductor 40 ranges from 0.2 W / (m·K) to 3.5 W / (m·K), enabling the heat conductor 40 to quickly transfer heat from the top and side surfaces of the electrical connector 20 to the top wall 31 for heat dissipation. This disclosure does not impose any particular limitation on the material of the heat conductor 40, as long as it has a high thermal conductivity. By way of example only, the material of the heat conductor 40 can be at least one of polyurethane, acrylate, epoxy resin, and silicone. Furthermore, the material of the heat conductor 40 can also be a hybrid of polyurethane, acrylate, epoxy resin, and silicone.

[0037] The battery device 100 provided in this disclosure uses a heat conductor 40 with a thermal conductivity of 0.2 W / (m·K) to 3.5 W / (m·K) to fill the housing 30. The heat conductor 40 adheres the electrical connector 20 to the top wall 31 and covers the top and side surfaces of the electrical connector 20. On the one hand, since the heat conductor 40 is filled between the electrical connector 20 and the top wall 31 of the housing 30, the heat on the electrical connector 20 can be quickly transferred to the top wall 31 of the housing 30 for heat dissipation. This avoids heat concentration inside the housing 30, which could lead to thermal runaway or other safety problems in the battery device 100.

[0038] Preferably, the thermal conductivity of the heat conductor 40 can be in the range of 1 W / (m·K) to 2 W / (m·K). Alternatively, the thermal conductivity of the heat conductor 40 can also be 0.5 W / (m·K), 1.0 W / (m·K), 1.5 W / (m·K), 2.0 W / (m·K), 2.5 W / (m·K), or 3.0 W / (m·K), etc.

[0039] In some embodiments, the heat conductor 40 is a thermally conductive adhesive 40. The surface of the thermally conductive adhesive 40 is adhesive, which can form an adhesive force at the point of contact with other objects. Since the thermally conductive adhesive 40 contacts the top wall 31 of the housing 30 and covers the top and side surfaces of the electrical connector 20, the thermally conductive adhesive 40 is bonded to both the top wall 31 of the housing 30 and the top and side surfaces of the electrical connector 20. This allows it to position and support the electrical connector 20, preventing the connection between the electrical connector 20 and the battery 10 from failing when the battery device 100 is subjected to vibration or impact, thereby improving the reliability of the battery device 100.

[0040] In some embodiments, reference Figure 4Each battery 10 includes a battery body 11 and terminals 12. Terminals 12 are located at the top of the battery body 11. The battery 10 is electrically connected to the electrical connector 20 via the terminals 12. A heat conductor 40 also covers the bottom surface of the electrical connector 20 and at least a portion of the terminals 12. The terminals 12 serve as channels for current flow in and out of the battery body 11 and also generate heat during charging and discharging. The heat conductor 40 covering the bottom surface of the electrical connector 20 and at least a portion of the terminals 12 facilitates the rapid transfer of heat from the terminals 12 and the connection point between the terminals 12 and the electrical connector 20 to the top wall 31 of the housing 30 for heat dissipation, thereby further improving the heat dissipation performance of the battery device 100.

[0041] In the embodiment where the heat conductor 40 is a thermally conductive adhesive 40, since the thermally conductive adhesive 40 also covers the bottom surface of the electrical connector 20 and at least part of the terminal post 12, it can provide positioning and support for both the electrical connector 20 and the terminal post 12, further reducing the risk of connection failure between the electrical connector 20 and the battery 10 when the battery device 100 is subjected to external vibration or impact, thereby further improving the reliability of the battery device 100.

[0042] In some embodiments, reference Figure 5 The heat conductor 40 also covers the top surface of the battery body 11. As the place where electricity is stored and discharged through chemical reactions, the battery body 11 also generates heat during charging and discharging. By covering the top surface of the battery body 11 with the heat conductor 40, the heat generated by the battery body 11 can be quickly transferred to the top wall 31 of the housing 30 for heat dissipation, thereby further improving the heat dissipation performance of the battery device 100.

[0043] In an embodiment where the heat conductor 40 is a thermally conductive adhesive 40, since the thermally conductive adhesive 40 covers the top surface of the battery body 11, it can play a role in positioning and supporting the battery body 11, thereby further improving the reliability of the battery device 100.

[0044] In some embodiments, reference Figure 6The heat conductor 40 also covers part of the side surface of the battery body 11. The distance from the bottom end of the heat conductor 40 to the top surface of the battery body 11 along the height direction of the battery 10 is h1. The height of the battery body 11 is H. The ratio of h1 to H, h1 / H, ranges from 0.001 to 0.3. By covering part of the side surface of the battery body 11, the heat conductor 40 increases the contact area between the heat conductor 40 and the battery body 11, thereby increasing the heat conduction of the heat conductor 40 to the battery body 11 and further improving the heat dissipation performance of the battery device 100. If the value of h1 / H is less than 0.001, the contact area between the side surface of the battery body 11 and the heat conductor 40 will be too small, resulting in poor heat dissipation. If the value of h1 / H is greater than 0.3, it will restrict the expansion of the battery body 11 due to charging. Especially when the elastic modulus of the heat conductor 40 is high, an excessively large value of h1 / H can prevent the battery body 11 from expanding naturally during charging, thus causing compression inside the battery body 11 and potentially leading to safety issues such as thermal runaway. Therefore, the value of h1 / H is in the range of 0.001-0.3, which ensures good heat dissipation while preventing any impact on the charging expansion of the battery body 11, thus guaranteeing the safety performance of the battery device 100.

[0045] Furthermore, if the value of h1 / H is too large, there will be more heat conductors 40 between the batteries 10. Due to the thermal conductivity of the heat conductors 40, when one battery 10 experiences thermal runaway, the other batteries 10 are more easily affected. Therefore, limiting the maximum value of h1 / H to 0.3 can prevent the batteries 10 from affecting each other in the event of thermal runaway while ensuring heat dissipation, thereby further improving the safety performance of the battery device 100.

[0046] Preferably, the value of h1 / H can be in the range of 0.1-0.2. Alternatively, h1 / H can also be 0.03, 0.06, 0.09, 0.12, 0.15, 0.18, 0.21, 0.24 or 0.27.

[0047] In some embodiments, reference Figure 7The battery body 11 includes a packaging body 111 and an electrode body 112 housed within the packaging body 111. The distance from the top of the electrode body 112 to the top surface of the battery body 11 along the height direction is h2. The absolute value of the difference between h1 and h2, |h1-h2|, ranges from 0mm to 4mm. At this time, along the height direction of the battery 10, the maximum distance between the bottom of the heat conductor 40 and the top of the electrode body 112 is 4mm. That is, the bottom of the heat conductor 40 covers the side of the battery body 11 at a minimum position of 4mm below the top of the electrode body 112 and a maximum position of 4mm above the top of the electrode body 112. When the position of the bottom of the heat conductor 40 is higher than 4mm above the top of the electrode body 112, the contact area between the side of the battery body 11 and the heat conductor 40 will be too small, thus failing to achieve a good heat dissipation effect. Since the active material is usually coated on the electrode body 112, if the bottom of the heat conductor 40 is lower than 4 mm below the top of the electrode body 112, the heat conductor 40 may compress the electrode body 112 when the battery body 11 expands during charging, causing the active material on the electrode body 112 to fall off. Therefore, by limiting the absolute value of the difference between h1 and h2, |h1-h2|, to a range of 0 mm to 4 mm, good heat dissipation can be ensured, and the compression of the electrode body 112 by the heat conductor 40 during the expansion of the battery body 11 during charging, thus preventing the active material from falling off the electrode body 112, can be avoided.

[0048] In the current embodiment, preferably, the value range of |h1-h2| can be 1.5mm-3mm. Alternatively, |h1-h2| can also be 0.4mm, 0.8mm, 1.2mm, 1.6mm, 2mm, 2.4mm, 2.8mm, 3.2mm or 3.6mm.

[0049] In some embodiments, reference Figure 7 The electrode body 112 includes a separator 1121 and at least two electrode plates 1122. Adjacent electrode plates 1122 are separated by the separator 1121. The top edge of any electrode plate 1122 is lower than the top edge of the separator 1121. The top edge of the electrode body 112 is defined by the top edge of the separator 1121. The value of |h1-h2| ranges from 0mm to 2mm. Since the active material is usually coated on the electrode plates 1122 of the electrode body 112, limiting the value of |h1-h2| to the range of 0mm-2mm further ensures that, while maintaining heat dissipation, the heat conductor 40 will not compress the electrode plates 1122 during the charging expansion of the battery body 11, thus preventing the active material from falling off the electrode plates 1122.

[0050] In the current embodiment, the value of |h1-h2| is preferably 0.5mm-1.5mm. Alternatively, |h1-h2| can also be 0.4mm, 0.8mm, 1.2mm or 1.6mm.

[0051] In some embodiments, reference Figure 6 The battery device 100 also includes a bracket 50. The bracket 50 supports multiple batteries 10 to position them relative to each other. The bracket 50 is located on the bottom side of the heat conductor 40 to define the bottom end of the heat conductor 40. By positioning the multiple batteries 10 with the bracket 50, it is ensured that the multiple batteries 10 will not move relative to each other during the filling of the heat conductor 40, which would cause gaps between the heat conductor 40 and the batteries 10 and affect the heat dissipation effect. On the other hand, it can also prevent the multiple batteries 10 from colliding with each other and breaking when the battery device 100 is subjected to external vibration, thereby preventing safety accidents. By placing the bracket 50 on the bottom side of the heat conductor 40, it is also beneficial to define the bottom end of the heat conductor 40 in an accurate position during the filling of the heat conductor 40, avoiding inaccurate positioning of the bottom end of the heat conductor 40, which would affect the heat dissipation effect or limit the charging expansion of the battery 10.

[0052] In some embodiments, reference Figure 8 The battery device 100 also includes a filler 60 located on the bottom side of the heat conductor 40. The filler 60 can be disposed in the gaps between adjacent batteries 10, in the gaps between multiple batteries 10 and the sidewall 33, or simultaneously in the gaps between adjacent batteries 10 and the gaps between multiple batteries 10 and the sidewall 33. The thermal conductivity of the filler 60 can be lower than that of the heat conductor 40 to prevent heat from being transferred to other batteries 10 through the filler 60 in the event of thermal runaway in one battery 10, thus affecting the other batteries 10. The elastic modulus of the filler 60 can also be lower than that of the heat conductor 40 to avoid limiting the charging expansion of the battery 10. Furthermore, the filling position of the filler 60 can be adjusted as needed, and the elastic modulus and thermal conductivity of the filler 60 located at different positions can be different.

[0053] Since the filler 60 is located on the bottom side of the heat conductor 40, if the filler 60 expands during application, it may affect the heat conductor 40, causing the bottom end of the heat conductor 40 to deviate from its designed position. Therefore, in some embodiments, a bracket 50 can be used to simultaneously define the bottom end of the heat conductor 40 and the top end of the filler 60. By placing the bracket 50 between the heat conductor 40 and the filler 60 to separate them, the filler 60 will not compress the heat conductor 40 even if it expands during application, thereby ensuring that the bottom end of the heat conductor 40 is defined in an accurate position by the bracket 50.

[0054] In some embodiments, the elastic modulus of the filler 60 can range from 50 MPa to 1000 MPa, thereby ensuring that the filler 60 does not restrict the expansion of the battery 10. The thermal conductivity of the filler 60 can range from 0.02 W / (m·K) to 2 W / (m·K), thereby ensuring that thermal runaway of one battery 10 will not affect other batteries 10.

[0055] Preferably, the elastic modulus of the filler 60 can be in the range of 350MPa-650MPa. Alternatively, the elastic modulus of the filler 60 can also be 100MPa, 200MPa, 300MPa, 400MPa, 500MPa, 600MPa, 700MPa, 800MPa or 900MPa.

[0056] Preferably, the thermal conductivity of the filler 60 can range from 0.7 W / (m·K) to 1.3 W / (m·K). Alternatively, the thermal conductivity of the filler 60 can also be 0.2 W / (m·K), 0.4 W / (m·K), 0.6 W / (m·K), 0.8 W / (m·K), 1.0 W / (m·K), 1.2 W / (m·K), 1.4 W / (m·K), 1.6 W / (m·K), or 1.8 W / (m·K).

[0057] In some embodiments, reference Figure 8 The battery device 100 also includes an adhesive 70 located on the bottom side of the filler 60. Each battery 10 includes a battery body 11. The adhesive 70 is disposed between the bottom wall 32 and the bottom end face of the battery body 11 and covers a portion of the side surface of the battery body 11. The elastic modulus of the adhesive 70 is greater than that of the filler 60. Thus, the adhesive 70 can position each battery 10 on the bottom wall 32, and together with the heat conductor 40, position the batteries 10 at both ends, thereby preventing the batteries 10 from colliding and breaking when the battery device 100 is subjected to external vibration, further enhancing the reliability of the battery device 100.

[0058] Since the heat conductor 40 transfers heat to the top wall 31 of the housing 30, if the top wall 31 cannot dissipate heat in time, it will limit the heat dissipation effect of the battery device 100. Therefore, in order to further improve the heat dissipation effect, in some embodiments, the top wall 31 is provided with a heat dissipation structure. The heat dissipation structure is, for example, a coolant pipe, through which coolant flows to carry away the heat of the top wall 31. The heat dissipation structure can also be, for example, a heat dissipation fin, which increases the contact area between the top wall 31 and the air to quickly release the heat of the top wall 31 into the air. In addition, the heat dissipation structure can also be other structures that can help dissipate heat from the top wall 31.

[0059] Furthermore, by incorporating a heat dissipation structure on the top wall 31 to enhance heat dissipation, the requirements for the thermal conductivity of the heat conductor 40 can be reduced. This is especially beneficial when high thermal conductivity heat conductors 40 are expensive, as the heat dissipation structure helps save costs.

[0060] In some embodiments, the plurality of batteries 10 are plurality of cylindrical batteries 10. Each cylindrical battery 10 may include a first tab and a second tab, the first tab and the second tab having opposite polarities. The first tab may be connected to a terminal 12, and the second tab may be connected to a package 111 to connect to an external circuit to form a loop.

[0061] <Example Electrical Equipment>

[0062] refer to Figure 9 This disclosure also provides an electrical device 200, which may include the battery device 100 described above.

[0063] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0064] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0065] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0066] 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 is not intended to exclude other components or parts.

[0067] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first and second poles), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0068] 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.

[0069] 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; An electrical connector is disposed on the top side of the plurality of batteries and is electrically connected to the plurality of batteries; The housing houses the plurality of batteries and the electrical connectors, and includes a top wall; as well as A heat conductor is filled inside the housing, contacts the top wall, and covers the top and side surfaces of the electrical connector. The thermal conductivity of the heat conductor ranges from 0.2 W / (m·K) to 3.5 W / (m·K).

2. The battery device according to claim 1, characterized in that, Each battery includes a battery body and terminals. The terminals are located at the top of the battery body. The battery is electrically connected to the electrical connector through the terminals. The heat conductor also covers the bottom surface of the electrical connector and at least part of the terminals.

3. The battery device according to claim 2, characterized in that, The heat conductor also covers the top surface of the battery body.

4. The battery device according to claim 3, characterized in that, The heat conductor also covers part of the side surface of the battery body. The distance from the bottom end of the heat conductor to the top surface of the battery body is h1. The height of the battery body is H. The ratio of h1 to H, h1 / H, ranges from 0.001 to 0.

3.

5. The battery device according to claim 4, characterized in that, The battery body includes a packaging body and an electrode body housed within the packaging body. The distance from the top of the electrode body to the top surface of the battery body is h2, and the absolute value of the difference between h1 and h2, |h1-h2|, ranges from 0mm to 4mm.

6. The battery device according to claim 5, characterized in that, The electrode body includes a diaphragm and at least two electrodes, two adjacent electrodes are separated by the diaphragm, the top edge of any one of the electrodes is lower than the top edge of the diaphragm, the top of the electrode body is defined by the top edge of the diaphragm, and the value of |h1-h2| ranges from 0mm to 2mm.

7. The battery device according to claim 1, characterized in that, It also includes a bracket that supports the plurality of batteries to position the plurality of batteries relative to each other, the bracket being located on the underside of the heat conductor to define the bottom end of the heat conductor.

8. The battery device according to claim 1, characterized in that, The material of the heat conductor is selected from one of polyurethane, acrylate, epoxy resin and silicone.

9. The battery device according to claim 1, characterized in that, It also includes a filler located on the bottom side of the heat conductor, the filler being disposed in the gap between adjacent batteries and / or the gap between the plurality of batteries and the side wall of the housing, wherein the elastic modulus of the filler is less than the elastic modulus of the heat conductor, and / or the thermal conductivity of the filler is less than the thermal conductivity of the heat conductor.

10. The battery device according to claim 9, characterized in that, The elastic modulus of the filler is in the range of 50MPa-1000MPa, and / or the thermal conductivity of the filler is in the range of 0.02W / (m·K)-2W / (m·K).

11. The battery device according to claim 9, characterized in that, It also includes an adhesive located on the bottom side of the filler, each battery includes a battery body, the housing also includes a bottom wall, the adhesive is disposed between the bottom wall and the bottom end face of the battery body and covers a portion of the side face of the battery body, wherein the elastic modulus of the adhesive is greater than the elastic modulus of the filler.

12. The battery device according to claim 1, characterized in that, The top wall is equipped with a heat dissipation structure.

13. The battery device according to claim 1, characterized in that, The plurality of batteries are multiple cylindrical batteries.

14. The battery device according to claim 1, characterized in that, The thermal conductor is a thermally conductive adhesive.

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

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