Battery pack

Abstract

The battery pack provided by the embodiment of the utility model comprises a cooling plate, a battery module, an insulating heat conduction layer and a fuse, in the battery pack, the connecting end of the end part of the fuse is in heat conduction connection with the cooling plate through the insulating heat conduction layer, the insulating heat conduction layer can quickly conduct and dissipate heat of the fuse, the heat conduction connection of the cooling plate and the insulating heat conduction layer further accelerates the temperature reduction of the fuse, and the heat dissipation effect of the fuse is further improved; and the connecting end of the fuse is electrically connected with the battery module, so that the temperature rise abnormity of the fuse caused by the increase of the capacity of the battery core can be reduced by radiating the fuse, and the probability of the temperature rise abnormity of the battery module is further reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery pack. Background Art

[0002] Fuses are widely used in battery energy storage systems, mainly to protect the circuit safety during the discharge process of battery modules. By installing a fuse in the battery pack, it is possible to prevent the battery module from being damaged due to overcharging or over-discharging, and improve the lifespan and safety of the battery module. However, under the trend of cost reduction and efficiency improvement in the industry, the large-scale capacity of energy storage cells has become one of the development trends. Energy storage cell products with large capacity specifications such as 300 ampere-hours (A·h) are accelerating the replacement of 280 A·h and are rapidly moving towards 500 A·h and even 1000 A·h. This means that fuses with a larger load-bearing capacity need to be selected. The larger the volume of the fuse, the more heat it generates during operation. In the battery pack, one end of the fuse is connected to the total negative electrode of the battery module through a conductive bar, and the other end is connected to the Manual Service Disconnect (MSD) through another conductive bar, thus forming a fuse-breaking circuit for the battery module. The heat generated by the larger fuse in the battery module is dissipated through the conductive bars at both ends of the fuse. If the heat dissipation capacity of the conductive bar is insufficient, the heat generated by the fuse will be transferred to the total negative electrode of the battery module through the conductive bar, resulting in abnormal temperature rise of the battery module, and further affecting the performance and safety of the battery pack. Therefore, it is necessary to perform heat dissipation treatment on the fuse itself to ensure normal temperature rise of the battery module. Summary of the Utility Model

[0003] The purpose of the embodiments of the present application is to provide a battery pack, which can improve the heat dissipation capacity of the fuse, reduce the abnormal temperature rise of the fuse caused by the increase in the cell capacity, and further reduce the probability of abnormal temperature rise of the battery module.

[0004] The embodiments of the present application provide a battery pack, including:

[0005] A cooling plate;

[0006] A battery module;

[0007] A fuse, the fuse and the battery module are arranged on the same side of the cooling plate, the fuse has a connection end, and the connection end is electrically connected to the battery module; and

[0008] An insulating heat-conducting layer is arranged between the fuse and the cooling plate, at least part of the connection end is connected to the insulating heat-conducting layer, and the insulating heat-conducting layer is thermally connected to the cooling plate to conduct the heat of the fuse to the cooling plate.

[0009] In one embodiment, the connection end and the insulating and heat-conducting layer are connected and arranged in a first direction. The length of the connection end in the first direction is L, and the depth of the connection between the connection end and the insulating and heat-conducting layer is d, where 0.15L ≤ d ≤ L.

[0010] In one embodiment, the fuse has two such connection ends. The fuse further includes a fuse body. The two connection ends are respectively arranged at two ends of the fuse body in a second direction, and the fuse body is embedded in the insulating and heat-conducting layer in the second direction, where the second direction intersects with the first direction.

[0011] In one embodiment, the length of the insulating and heat-conducting layer in the second direction is greater than or equal to the length of the fuse in the second direction.

[0012] In one embodiment, the battery pack further includes a housing. The housing is arranged between the fuse and the cooling plate. A receiving cavity is formed in the housing, and the insulating and heat-conducting layer is arranged in the receiving cavity.

[0013] In one embodiment, the surface of the insulating and heat-conducting layer away from the bottom of the housing is lower than the end face of the housing close to the fuse.

[0014] In one embodiment, a through hole is formed in the bottom or side wall of the housing, and the through hole communicates with the receiving cavity;

[0015] The battery pack further includes a conduction part. At least a part of the conduction part is arranged in the through hole. One end of the conduction part is connected to the insulating and heat-conducting layer, and the other end of the conduction part is connected to the cooling plate.

[0016] In one embodiment, the conduction part further extends outside the housing. The battery pack further includes a protective cover. The protective cover covers the outer side surface of the conduction part, and the protective cover is connected to the housing.

[0017] In one embodiment, the thermal conductivity of the insulating and heat-conducting layer is k, where 10 W / m·K < k ≤ 15 W / m·K.

[0018] In one embodiment, the battery pack further includes a bus bar. The bus bar is connected between the battery module and the connection end;

[0019] The bus bar is arranged outside the insulating and heat-conducting layer, or at least a part of the bus bar is embedded in the insulating and heat-conducting layer.

[0020] The beneficial effects of the battery pack provided by the embodiments of the present application are as follows: The battery pack of the present application includes a cooling plate, a battery module, an insulating heat-conducting layer, and a fuse; compared with the related art, in the battery pack of the present application, the connection end of the fuse end is thermally connected to the cooling plate through the insulating heat-conducting layer, and the insulating heat-conducting layer can quickly conduct and dissipate the heat of the fuse, and the thermal connection between the cooling plate and the insulating heat-conducting layer further accelerates the temperature drop of the fuse, further improving the heat dissipation effect on the fuse; and because the connection end of the fuse is electrically connected to the battery module, dissipating heat from the fuse can reduce the abnormal temperature rise of the fuse caused by the increase in the cell capacity, thereby reducing the probability of abnormal temperature rise of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application;

[0023] Figure 2 It is a three-dimensional structural diagram of a fuse assembly in a battery pack provided by an embodiment of the present application;

[0024] Figure 3 It is a cross-sectional structural diagram of an insulating heat-conducting layer and a connection end in a battery pack provided by an embodiment of the present application;

[0025] Figure 4 It is a three-dimensional structural diagram of a fuse assembly in a battery pack provided by another embodiment of the present application;

[0026] Figure 5 It is a structural diagram of an insulating heat-conducting layer and a conduction part in a battery pack provided by another embodiment of the present application;

[0027] Figure 6 It is a structural diagram of a housing, a protective cover, and a fixing frame in a battery pack provided by another embodiment of the present application;

[0028] Among them, the reference numerals in the drawings are as follows:

[0029] Battery pack 1000; Fuse assembly 100; Battery module 200; Cooling plate 300; Conductive busbar 400;

[0030] Housing 110; Insulating and heat-conducting layer 120; Fuse 130; Fixed bracket 140; Connecting bracket 150; Conductive part 160; Protective cover 170; Accommodating cavity U; Through hole K; Fuse body 131; Connecting end 132; Fusible tube 131A; Fuse element 131B;

[0031] First direction Y; Second direction X; Third direction Z. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0036] Please refer to Figures 1 to 3 together, and now a battery pack 1000 provided by an embodiment of the present application will be described. As Figure 1 shown, the battery pack 1000 includes a fusing assembly 100, and also includes a battery module 200 and a cooling plate 300. Both the fusing assembly 100 and the battery module 200 are disposed on the same side of the cooling plate 300, and the fusing assembly 100 is disposed at an end of the battery module 200. Optionally, as Figure 1As shown, the fusing component 100 and the battery module 200 are both disposed on the cooling plate 300, and the cooling plate 300 cools the two from the bottom of the battery module 200 and the fusing component 100; alternatively, the cooling plate 300 is disposed above the battery module 200 and the fusing component 100 to cool the battery module 200 and the fusing component 100 located thereunder from above.

[0037] Specifically, the fusing component 100 includes an insulating and heat-conducting layer 120 and a fuse 130. In this embodiment, the fuse 130 is located above the cooling plate 300, and the insulating and heat-conducting layer 120 is located between the fuse 130 and the cooling plate 300. Optionally, the fuse 130 is disposed on the insulating and heat-conducting layer 120 or a part of the fuse 130 is embedded in the insulating and heat-conducting layer 120.

[0038] Wherein, the fuse 130 includes a fuse body 131 and a connection end 132 connected to the fuse body 131, as Figure 2 shown. The connection end 132 is electrically connected to the battery module 200, and at least a part of the connection end 132 is connected to the insulating and heat-conducting layer 120. The insulating and heat-conducting layer 120 is thermally connected to the cooling plate 300 to conduct the heat of the fuse 130 to the cooling plate 300.

[0039] In the battery pack 1000 provided by the embodiment of the present application, the connection end 132 at the end of the fuse 130 is thermally connected to the cooling plate 300 through the insulating and heat-conducting layer 120. The insulating and heat-conducting layer 120 can quickly conduct and dissipate the heat of the fuse 130. The thermal connection between the cooling plate 300 and the insulating and heat-conducting layer 120 further accelerates the temperature drop of the fuse 130, and further improves the heat dissipation effect on the fuse 130; and since the connection end 132 of the fuse 130 is electrically connected to the battery module 200, dissipating heat from the fuse 130 can reduce the abnormal temperature rise of the fuse 130 caused by the increase in the cell capacity, thereby reducing the probability of abnormal temperature rise of the battery module 200.

[0040] As Figure 2As shown, the fuse component 100 further includes a housing 110 and a fixing bracket 140. The housing 110 is disposed between the fuse 130 and the cooling plate 300; the fixing bracket 140 is disposed on the side of the housing 110 away from the cooling plate 300, and is specifically connected to a side wall of the housing 110; a receiving cavity U is formed in the housing 110, and the insulating and heat-conducting layer 120 is disposed in the receiving cavity U; the fuse 130 is disposed on the insulating and heat-conducting layer 120 or a part of the fuse 130 is embedded in the insulating and heat-conducting layer 120, and the fuse 130 is connected to the fixing bracket 140 through a connecting member, and then fixed to the housing 110 through the fixing bracket 140. Among them, the fuse 130 includes a fuse body 131 and two connecting ends 132, and the two connecting ends 132 are respectively disposed at both ends of the fuse body 131 along the second direction X. The fuse body 131 extends along the second direction X, that is, the second direction X is the length direction of the fuse body 131. Specifically, both connecting ends 132 extend into the insulating and heat-conducting layer 120 along the first direction Y and are connected to the insulating and heat-conducting layer 120. Among them, the first direction Y intersects the second direction X.

[0041] Optionally, the connecting end 132 is made of metal, so that the connecting end 132 has high heat conduction ability and electrical conductivity. For example, the connecting end 132 is made of metals such as copper, aluminum, and aluminum alloy.

[0042] It can be understood that the fuse 130 can be fixedly connected to the housing 110 through the fixing bracket 140. Optionally, the connecting member is a screw or a rivet, etc. Optionally, in some other embodiments, the fuse component 100 includes a housing 110, an insulating and heat-conducting layer 120, and a fuse 130. The fuse 130 is disposed in the receiving cavity U of the housing 110 and is connected to the side wall of the housing 110 through a connecting member, thereby saving the setting of the fixing bracket 140.

[0043] In this embodiment, the battery pack 1000 further includes two conductive bars 400, and the battery module 200 includes a battery pack and a manual service disconnect (MSD). The two conductive bars 400 are respectively connected to the two connecting ends 132 correspondingly, as Figure 1 shown. One conductive bar 400 is connected between one connecting end 132 and the negative electrode of the battery module 200, and the other conductive bar 400 is connected between the other connecting end 132 and the MSD.

[0044] In this embodiment, due to the provision of the fuse component 100 with strong heat dissipation ability, the length of the conductive bar 400 can be set shorter, thereby saving the space occupied by the conductive bar 400 in the battery pack 1000.

[0045] Optionally, the conductive bar 400 is disposed on the insulating and heat-conducting layer 120, or a part of the conductive bar 400 is embedded in the insulating and heat-conducting layer 120. AsFigure 1 As shown, the bus bar 400 is disposed on the insulating and heat-conducting layer 120 and is in contact with the side surface of the connection end 132 exposed from the insulating and heat-conducting layer 120. Alternatively, in some other embodiments, at least a part of the bus bar 400 is embedded in the insulating and heat-conducting layer 120 and is in contact with the end surface in the thickness direction of the connection end 132 to achieve electrical connection. It can be understood that part of the heat of the fuse 130 is transferred to the bus bar 400 through the connection end 132. At least a part of the bus bar 400 is embedded in the insulating and heat-conducting layer 120, and the heat transferred to the bus bar 400 can be dissipated through the insulating and heat-conducting layer 120, thereby further improving the heat dissipation effect on the fuse 130.

[0046] In this embodiment, as Figure 2 shown, the fuse body 131 includes a fuse element 132B and a fuse tube 132A and the fuse element 132B. The fuse tube 132A wraps around the side surface of the fuse element 132B to insulate and protect the fuse element 132B. The fuse element 132B is the core component of the fuse 130. When the circuit is overloaded and the current is too large, the fuse element 132B melts to cut off the current. Optionally, the fuse tube 132A is made of heat-resistant insulating materials such as glass and ceramics.

[0047] Optionally, the length W2 of the insulating and heat-conducting layer 120 in the second direction X is greater than or equal to the length W1 of the fuse 130 in the second direction X, so that the connection ends 132 at both ends of the fuse 130 extend downward and are connected to the insulating and heat-conducting layer 120 below for heat dissipation. That is, the length W2 of the insulating and heat-conducting layer 120 in the second direction X is greater than or equal to the length W1 of the fuse 130 in the second direction X, which facilitates the connection of the two connection ends 132 to the insulating and heat-conducting layer 120. In this embodiment, the length W2 of the insulating and heat-conducting layer 120 in the second direction X is greater than the length W1 of the fuse 130 in the second direction X, as Figure 3 shown.

[0048] In this embodiment, the fuse body 131 is embedded in the insulating and heat-conducting layer 120 in the second direction X. It can be understood that during the preparation process, the connection end 132 is connected to the fixing frame 140 along with the fuse body 131, and part of the fuse body 131 is located in the accommodation cavity U, and part of the connection end 132 is also located in the accommodation cavity U; the insulating and heat-conducting adhesive is poured into the accommodation cavity U, wraps around the lower parts of the fuse body 131 and the two connection ends 132, and is cured to form the insulating and heat-conducting layer 120. That is, the connection end 132 is fixed together with the fuse body 131, and the insulating and heat-conducting adhesive not only wraps the fuse body 131 but also wraps the two connection ends 132. The fuse body 131 is embedded in the insulating and heat-conducting layer 120, and the insulating and heat-conducting layer 120 can further reinforce the fuse body 131, and the insulating and heat-conducting layer 120 can also play a certain heat dissipation role for the fuse body 131, thereby further improving the heat dissipation capacity. AsFigure 2 and Figure 3 As shown, the insulating and heat-conducting layer 120 contacts the side end surface of a part of the melt 132B, so that heat dissipation of the fuse body 131 can be performed.

[0049] Optionally, in some other embodiments, the fuse body 131 is disposed on the insulating and heat-conducting layer 120, and the connection end 132 extends downward along the first direction Y into the insulating and heat-conducting layer 120 to be connected to the insulating and heat-conducting layer 120. As long as both connection ends 132 are connected to the insulating and heat-conducting layer 120.

[0050] As Figure 3 shown, the connection end 132 extends along the first direction Y. Wherein, the first direction Y is the length direction of the connection end 132. The length of the connection end 132 along the first direction Y is L, and the depth of the connection end 132 connected to the insulating and heat-conducting layer 120 is d, and 0.15L≤d≤L. For example, d = 0.15L, d = 0.2L, d = 0.25L, d = 0.3L, d = 0.35L, d = 0.4L, d = 0.45L, d = 0.5L, d = 0.55L, d = 0.6L, d = 0.65L, d = 0.7L, d = 0.75L, d = 0.8L, d = 0.85L, d = 0.9L, d = 0.95L or d = 1L, etc. It can be understood that the larger the depth d of the connection end 132 embedded in the insulating and heat-conducting layer 120, the larger the contact area between the insulating and heat-conducting layer 120 and the connection end 132, and thus the better the heat dissipation effect on the connection end 132. Setting 0.15L≤d≤L can increase the contact ratio between the connection end 132 and the insulating and heat-conducting layer 120, thereby improving the heat dissipation effect of the insulating and heat-conducting layer 120 on the connection end 132, and further improving the heat dissipation effect on the fuse 130.

[0051] Optionally, in some other embodiments, the fuse body 131 is completely embedded in the insulating and heat-conducting layer 120, and the connection end 132 is also completely embedded in the insulating and heat-conducting layer 120 to further increase the contact area between the insulating and heat-conducting layer 120 and the connection end 132. It should be noted that the connection end 132 of the fuse 130 is used to connect to the busbar 400, and then connect to the negative electrode of the battery module 200 or other components through the busbar 400. Specifically, the two connection ends 132 respectively correspond to connecting two busbars. In this embodiment, the busbar 400 is disposed on the end face of the connection end 132 along the third direction Z, which is the thickness direction of the connection end 132, and the end face area of the connection end 132 along the third direction Z is relatively large. The third direction Z intersects with the second direction X and the first direction Y pairwise. In this embodiment, the third direction Z, the second direction X, and the first direction Y are perpendicular to each other pairwise. It can be understood that disposing the busbar 400 on the end face with a larger area of the connection end 132 can greatly increase the electrical connection between the busbar 400 and the connection end 132 and reduce the resistance therebetween. In the embodiment where the connection end 132 is completely embedded in the insulating and heat-conducting layer 120, at least a part of the busbar 400 also extends and is embedded in the insulating and heat-conducting layer 120 to achieve electrical connection with the connection end 132. Thus, one end face of the connection end 132 along the third direction Z contacts the busbar 400, and the rest is wrapped by the insulating and heat-conducting layer 120 and in contact therewith; this not only ensures the electrical connection with the busbar 400 but also obtains a great heat dissipation effect; moreover, the insulating and heat-conducting layer 120 also wraps the outer surface of the busbar 400, playing a role in dissipating heat from the busbar 400 and further improving the heat dissipation effect.

[0052] In this embodiment, the insulating and heat-conducting layer 120 is made of an insulating and heat-conducting adhesive, and the thermal conductivity of the insulating and heat-conducting layer 120 is k, where 10 W / m·K < k ≤ 15 W / m·K. For example, k can be 11 W / m·K, 11.5 W / m·K, 12 W / m·K, 12.5 W / m·K, 13 W / m·K, 13.5 W / m·K, 14 W / m·K, 14.5 W / m·K, or 15 W / m·K. It can be understood that the greater the thermal conductivity k of the insulating and heat-conducting layer 120, the stronger the heat dissipation ability of the insulating and heat-conducting layer 120 for the connection end 132.

[0053] Optionally, the side of the insulating and heat-conducting layer 120 away from the bottom of the housing 110 is lower than the end face of the housing 110 near the fuse 130. It can be understood that when the insulating and heat-conducting adhesive is poured into the accommodation cavity U, and the upper surface of the insulating and heat-conducting adhesive away from the bottom of the housing 110 is lower than the end face of the housing 110 near the fuse 130, so as to avoid the overflow of the insulating and heat-conducting adhesive, making the side of the cured insulating and heat-conducting layer 120 away from the bottom of the housing 110 lower than the end face of the housing 110 near the fuse 130. Optionally, the side of the insulating and heat-conducting layer 120 away from the bottom of the housing 110 is 1-2 millimeters (mm) lower than the end face of the housing 110 near the fuse 130, such as 1mm, 1.5mm, 2mm, etc. In this way, while avoiding the overflow of the insulating and heat-conducting adhesive, it can ensure that the insulating and heat-conducting layer 120 has sufficient volume absorption capacity and provides heat dissipation ability, reducing space waste.

[0054] In this embodiment, the insulating and heat-conducting layer 120 is used to conduct the heat of the connection end 132 to the cooling plate 300 in the battery pack 1000, so as to effectively cool and dissipate the heat of the fuse 130. In this embodiment, the fuse assembly 100 further includes a connection bracket 150. When assembling the fuse assembly 100, the housing 110 and the fixing frame 140 are connected and fixed to the connection bracket 150, and then fixedly connected to the bottom of the battery pack through the connection bracket 150, and the housing 110 is in contact with the cooling plate 300, so that the heat of the insulating and heat-conducting layer 120 can be dissipated to the cooling plate 300 through the indirect transfer of the housing 110. Optionally, a through hole K communicating with the accommodation cavity U may be provided on the housing 110, and a conduction part 160 formed by the insulating and heat-conducting adhesive is arranged in the through hole K to connect the insulating and heat-conducting layer 120 and the cooling plate 300, so that the insulating and heat-conducting layer 120 can transfer heat to the cooling plate 300 through the conduction part 160 with better heat conduction performance.

[0055] Optionally, the through hole K is provided at the bottom of the housing 110, and the housing 110 is arranged on the cooling plate 300, so that one end of the conduction part 160 is connected to the insulating and heat-conducting layer 120, and the other end can be directly connected to the cooling plate 300 under the housing 110 for heat dissipation, with a simple structure. Optionally, in some other embodiments, the through hole K is provided on the side wall of the housing 110, as long as it can realize the connection and heat dissipation between the insulating and heat-conducting layer 120 and the cooling plate 300 through the conduction part 160, and the present application does not limit this.

[0056] During the preparation process, first fix the fuse 130 to the fixing bracket 140, and then pour the insulating and heat-conducting glue into the accommodation cavity U of the housing 110; after the insulating and heat-conducting glue cures, an insulating cured layer is formed to wrap the lower part of the fuse body 131 and the two connection ends 132, and a conduction part 160 is formed; then arrange the fuse assembly 100 on the cooling plate 300, and respectively assemble the two conductive bars 400 with the two connection ends 132. Or, first arrange the fuse assembly 100 on the cooling plate 300, and respectively assemble the two conductive bars 400 with the two connection ends 132; then pour the insulating and heat-conducting glue into the accommodation cavity U of the housing 110, so that the insulating and heat-conducting glue is located below the conductive bars 400, or the insulating and heat-conducting glue wraps the lower part of the fuse body 131 and the two connection ends 132, and after curing, an insulating cured layer and a conduction part 160 are formed.

[0057] Please refer to Figures 4 to 6 , another embodiment of the present application provides a battery pack 1000. The structure of this embodiment is substantially the same as that of the previous embodiment, the difference being that: the battery pack 1000 of this embodiment is further provided with a protective cover 170 and the specific structure of the conduction part 160.

[0058] As Figures 4 to 6 shown, the fuse assembly 100 of the battery pack 1000 further includes a protective cover 170 and a conduction part 160. The housing 110 is provided with a through hole K, and the through hole K communicates with the accommodation cavity U. The conduction part 160 is partially arranged in the through hole K and partially extends downward outside the housing 110; one end is connected to the insulating and heat-conducting layer 120, and the other end is connected to the cooling plate 300. The protective cover 170 covers the outer side surface of the conduction part 160 to protect the conduction part 160 and expose the end surface to enable the conduction part 160 to be connected to the cooling plate 300.

[0059] In this embodiment, the volume of the housing 110 and the insulating and heat-conducting layer 120 can be set to be smaller, and the heat transfer between the insulating and heat-conducting layer 120 and the cooling plate 300 is realized by setting a larger conduction part 160, reducing the overall occupied space of the fuse assembly 100.

[0060] The above is the description of the battery pack 1000 provided by the embodiment of the present application.

[0061] The battery pack provided by the embodiment of the present application includes a cooling plate, a battery module, an insulating and heat-conducting layer, and a fuse; in the battery pack of the present application, the connection ends at the two ends of the fuse are thermally connected to the cooling plate through the insulating and heat-conducting layer, and the insulating and heat-conducting layer can quickly conduct and dissipate the heat of the fuse. The thermal connection between the cooling plate and the insulating and heat-conducting layer further accelerates the temperature drop of the fuse, further improving the heat dissipation effect on the fuse; and since the connection ends of the fuse are electrically connected to the battery module, dissipating heat from the fuse can reduce the abnormal temperature rise of the fuse caused by the increase in the cell capacity, thereby reducing the probability of abnormal temperature rise of the battery module.

[0062] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A battery pack, characterized in that, Comprising: A cooling plate; A battery module; A fuse, the fuse and the battery module are arranged on the same side of the cooling plate, the fuse has a connection end, and the connection end is electrically connected to the battery module; And An insulating and heat-conducting layer, arranged between the fuse and the cooling plate, at least part of the connection end is connected to the insulating and heat-conducting layer, and the insulating and heat-conducting layer is thermally connected to the cooling plate to conduct the heat of the fuse to the cooling plate.

2. The battery pack according to claim 1, characterized in that, The connection end and the insulating and heat-conducting layer are connected and arranged in a first direction, the length of the connection end in the first direction is L, and the depth of the connection between the connection end and the insulating and heat-conducting layer is d, wherein, 0.15L≤d≤L.

3. The battery pack according to claim 2, wherein The fuse has two connection ends, the fuse further includes a fuse body, the two connection ends are respectively arranged at both ends of the fuse body in a second direction, and the fuse body is embedded in the insulating and heat-conducting layer in the second direction, wherein, the second direction intersects with the first direction.

4. The battery pack according to claim 3, characterized in that, The length of the insulating and heat-conducting layer in the second direction is greater than or equal to the length of the fuse in the second direction.

5. The battery pack according to claim 1, characterized in that The battery pack further includes a housing, the housing is arranged between the fuse and the cooling plate, a receiving cavity is formed in the housing, and the insulating and heat-conducting layer is arranged in the receiving cavity.

6. The battery pack according to claim 5, characterized in that, The surface of the insulating and heat-conducting layer away from the bottom of the housing is lower than the end face of the housing close to the fuse.

7. The battery pack according to claim 5, characterized in that, A through hole is formed in the bottom or side wall of the housing, and the through hole is communicated with the receiving cavity; The battery pack further includes a conduction part, at least part of the conduction part is arranged in the through hole, one end of the conduction part is connected to the insulating and heat-conducting layer, and the other end of the conduction part is connected to the cooling plate.

8. The battery pack according to claim 7, characterized in that, The conduction part also extends outside the housing, the battery pack further includes a protective cover, the protective cover covers the outer side surface of the conduction part, and the protective cover is connected to the housing.

9. The battery pack according to claim 1, characterized in that, The heat conduction coefficient of the insulating and heat-conducting layer is k, wherein, 10W / m·K<k≤15W / m·K.

10. The battery pack according to claim 1, characterized in that, The battery pack further includes a conductive bar, and the conductive bar is connected between the battery module and the connection end; The conductive bar is arranged outside the insulating and heat-conducting layer, or, at least part of the conductive bar is embedded in the insulating and heat-conducting layer.

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