Heating assembly and battery pack

Abstract

The utility model relates to a heating assembly and a battery pack, and is applied to the field of batteries. The device comprises a liquid cooling plate, a water inlet pipe and a heating unit, the liquid cooling plate is used for making contact with a battery cell system to achieve heat exchange, and the water inlet pipe is used for communicating with the liquid cooling plate; the heating unit comprises a protective film and a heating wire, the protective film covers the periphery of the water inlet pipe, the heating wire is clamped between the protective film and the water inlet pipe, and the heating wire can be electrically connected to the battery cell system. According to the heating assembly, the heating unit is arranged on the periphery of the water inlet pipe used for supplying liquid to the liquid cooling plate, rapid heating of the heating unit is achieved through power supply of the battery cell system to the heating wire, then rapid heating of cooling liquid flowing through the water inlet pipe is achieved through heat exchange, the liquid cooling plate is evenly heated and rapidly heated, and the heating efficiency of the liquid cooling plate is improved. Therefore, the battery cell system attached to the battery cell heating device can be uniformly heated and rapidly heated, and the temperature consistency of the battery cell system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a heating assembly and a battery pack. Background Art

[0002] Battery packs are currently widely used in power battery systems and energy storage systems. Because the cells in battery packs are sensitive to the external environment, especially to high and low temperatures, they can experience a series of performance degradation and accelerated aging. In particular, when starting a battery pack in a low-temperature environment, the cells must first be heated to the ideal operating temperature to ensure the battery pack's service life.

[0003] In related technologies, a corresponding thermal management system is usually set up according to the temperature requirements of the battery cells. The thermal management system includes a heating film attached to the battery cells, which directly exchanges heat with the battery cells through the heating film, so that the battery cells can quickly heat up under low temperature conditions. However, due to the uneven distribution of the heating area in the heating film, it is easy to cause uneven heating of the battery cells. Utility Model Content

[0004] Based on this, it is necessary to provide a heating component and a battery pack to address the problem that the direct heating of the battery cell by using a heating film easily leads to uneven heating of the battery cell.

[0005] In a first aspect, the present application provides a heating assembly, which adopts the following technical solution:

[0006] A heating assembly includes a liquid cooling plate, a water inlet pipe, and a heating unit. The liquid cooling plate is used to contact a battery cell system to achieve heat exchange. The water inlet pipe is connected to the liquid cooling plate. The heating unit includes a protective film and a heating wire. The protective film is wrapped around the outer periphery of the water inlet pipe. The heating wire is clamped between the protective film and the outer wall of the water inlet pipe. The heating wire can be electrically connected to the battery cell system.

[0007] In one embodiment, the heating unit further includes an adhesive layer, and the adhesive layer is bonded between the protective film and the water inlet pipe.

[0008] In one embodiment, the heating unit further includes a heat-insulating layer, and the heat-insulating layer is wrapped around the periphery of the protective film.

[0009] In one embodiment, the heating wire is arranged around the periphery of the water inlet pipe along the extension direction of the water inlet pipe.

[0010] In one embodiment, the heating wire is arranged in an S shape along the extension direction of the water inlet pipe.

[0011] In a second aspect, the present application provides a battery pack, which adopts the following technical solution:

[0012] A battery pack includes a shell, a battery cell system and the above-mentioned heating component, the shell includes an upper cover, a bottom guard plate and a box body connected between the upper cover and the bottom guard plate, and an installation interval is formed between the upper cover, the box body and the bottom guard plate; the battery cell system is accommodated in the installation interval; the heating component is arranged in the installation interval, and the liquid cooling plate is in contact with the battery cell system to achieve heat exchange.

[0013] In one embodiment, the battery pack further includes a switch unit, which electrically connects the temperature rising unit to the battery cell system and is capable of controlling the on / off of the circuit between the temperature rising unit and the battery cell system.

[0014] In one embodiment, the battery pack further includes a connecting unit for electrically connecting the switch unit to the battery cell system, the connecting unit including a positive copper busbar and a negative copper busbar, the positive copper busbar being used to electrically connect the switch unit to the positive electrode of the battery cell system, and the negative copper busbar being used to electrically connect the switch unit to the negative electrode of the battery cell system.

[0015] In one embodiment, the battery pack further includes a connecting harness accommodated in the installation area, wherein the connecting harness is connected between the switch unit and the temperature rising unit to electrically connect the heating wire to the switch unit.

[0016] In one embodiment, the installation interval includes a first installation interval and a second installation interval, and the heating assembly further includes a water outlet pipe, wherein the battery cell system is installed in the first installation interval, and the switch unit, water inlet pipe and water outlet pipe are arranged side by side in the second installation interval.

[0017] The above-mentioned heating component is equipped with a heating unit on the periphery of the water inlet pipe used to supply liquid to the liquid cooling plate. The heating unit is quickly heated by supplying power to the heating wire, and then the coolant flowing through the water inlet pipe is quickly heated by heat exchange, so that the liquid cooling plate is heated evenly and quickly. In this way, the battery cell system attached to it can be heated evenly, thereby improving the temperature consistency of the battery cell system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a battery pack in one embodiment of the present application.

[0019] Figure 2 This is an exploded view of a battery pack in one embodiment of the present application.

[0020] Figure 3 Schematic diagram of a heating element in one embodiment of the present application.

[0021] Figure 4 for Figure 3 Enlarged view of part A.

[0022] Figure 5 This is an expanded view of a heating element in one embodiment of the present application.

[0023] Description of the accompanying drawings:

[0024] 1. Heating assembly; 11. Liquid cooling plate; 12. Water pipe unit; 121. Water inlet pipe; 122. Water outlet pipe; 13. Heating unit; 131. Protective film; 132. Heating wire; 133. Adhesive layer; 134. Insulation layer; 14. Switch unit; 151. Positive copper busbar; 152. Negative copper busbar; 16. Connecting wire harness; 2. Housing; 21. Upper cover; 22. Bottom guard plate; 23. Box; 3. Battery cell system; 4. Thermal adhesive layer; 5. Installation area. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0031] The following is combined with Figure 1-5 The embodiments of the present application are described in further detail.

[0032] See Figure 1 , Figure 1 A schematic diagram of a battery pack in an embodiment of the present application is shown. An embodiment of the present application provides a battery pack, which specifically includes a battery cell system 3 and a shell 2 for accommodating the battery cell system 3.

[0033] Specifically, the housing 2 includes an upper cover 21, a bottom guard plate 22, and a box body 23 connected between the upper cover 21 and the bottom guard plate 22. In the embodiment of the present application, the box body 23, the upper cover 21, and the bottom guard plate 22 define an installation area 5. The battery cell system 3 is accommodated in the installation area 5 to achieve installation, fixation, and protection of the battery cell system 3. The battery cell system 3 includes multiple battery cells.

[0034] Furthermore, because the battery cell system 3 is sensitive to ambient temperature, particularly high and low temperatures, which can lead to a series of performance degradation and accelerated aging, when the electric vehicle is started in a low-temperature environment, the battery cell system 3 must first be heated to reach the ideal operating temperature to ensure the battery pack's service life. This ensures a long battery pack lifespan.

[0035] Combine Figure 2 As shown, Figure 2 An exploded diagram of a battery pack in one embodiment of the present application is shown. Currently, for electric vehicles starting in low-temperature environments, a method is commonly used to directly heat the battery cells using a heating film to heat the battery cells at low temperatures. This method has the advantage of rapid heating, but it also brings about the problem of uneven heating of the battery cells. Therefore, to address this issue, the battery pack of the present application further includes a heating component 1 for heating the battery cell system 3. The heating component 1 is located within the installation area 5 and is capable of contacting the battery cell system 3 to achieve heat exchange, thereby achieving uniform heating of the battery cell system 3.

[0036] Combine Figures 1 to 3 As shown, Figure 3 A schematic diagram of a heating assembly in an embodiment of the present application is shown. In some embodiments, the heating assembly 1 includes a liquid cooling plate 11 for contacting with the battery cell system 3 to achieve heat exchange. The liquid cooling plate 11 is connected to a water pipe unit 12 for supplying liquid to the liquid cooling plate 11. The outer side of the water pipe unit 12 is covered with a heating unit 13, and the heating unit 13 is used to heat the water pipe unit 12. During actual operation, the heating unit 13 heats the water pipe unit 12 so that the coolant is heated and flows into the liquid cooling plate 11 through the water pipe unit 12, and exchanges heat with the battery cell system 3, thereby achieving rapid heating of the battery cell system 3. It should be noted that the coolant in the present application can not only have a cooling effect, but also can heat the battery cell system 3 after the coolant is heated.

[0037] Specifically, the contact between the liquid cooling plate 11 and the battery cell system 3 may be direct contact. In some other embodiments, in order to ensure the stability of heat transfer between the battery cell system 3 and the heating component 1, the battery pack further includes a thermally conductive adhesive layer 4 bonded between the battery cell system 3 and the heating component 1. In the embodiment of the present application, the thermally conductive adhesive layer 4 may be a thermally conductive structural adhesive applied between the battery cell system 3 and the heating component 1. On the one hand, the thermally conductive structural adhesive can achieve relative fixation between the battery cell system 3 and the heating component 1 to ensure the stability of heat transfer; on the other hand, the thermally conductive structural adhesive has a thermal conductive function, which can stably and uniformly achieve heat exchange between the battery cell component and the heating component 1. In addition, the setting position of the liquid cooling plate 11 can be as follows: Figure 2As shown, the liquid cooling plate 11 can be arranged at the bottom of the battery cell system 3, that is, between the bottom guard plate 22 and the box body 23; in some other embodiments, the liquid cooling plate 11 can also be arranged on the top surface and / or side surface of the battery cell system 3, which is not limited here.

[0038] Specifically, the water pipe unit 12 includes a water inlet pipe 121 and a water outlet pipe 122 located in the box body 23. The water inlet pipe 121 and the water outlet pipe 122 are respectively connected to the water inlet and water outlet of the liquid cooling plate 11. The above-mentioned heating unit 13 is installed on the water inlet pipe 121 to achieve heating of the water inlet pipe 121 and the coolant.

[0039] In an embodiment of the present application, the heating unit 13 includes a heating wire 132 electrically connected to the battery cell system 3 and a protective film 131 wrapped around the outer periphery of the water inlet pipe 121, wherein the heating wire 132 is clamped between the protective film 131 and the outer wall of the water inlet pipe 121, and the protective film 131 is wrapped around the outside of the heating wire 132 to insulate and protect the heating wire 132, and the protective film 131 and the heating wire 132 together form a heating plate. The heating wire 132 is used to quickly heat up the coolant flowing through the water inlet pipe 121, and the heated coolant flows into the liquid cooling plate 11 to achieve a rapid and uniform heating operation of the battery cell system 3. Among them, a protective film 131 can also be provided between the heating wire 132 and the outer wall of the water inlet pipe 121, that is, the heating wire 132 is located between the two layers of protective film 131, all of which are within the scope of protection of the present application.

[0040] Compared with other heating methods, the heating assembly and battery pack shown in this application firstly provide uniform heating of the entire cell system 3 and good temperature consistency. Moreover, the overall structure is simple, and the heating wire 132 can be powered directly through the cell system 3 without the need for external auxiliary power supply components. In addition, a heating unit 13 can be directly added to the water inlet pipe 121 of the existing liquid cooling plate 11 without redesigning the structure of the water inlet pipe 121. The manufacturing and assembly costs are low, and it can be used in the mass production of battery packs to reduce overall production and manufacturing costs. In addition, by providing a heating unit 13 to heat the water inlet pipe 121, compared with the method of directly passing a hot fluid into the water inlet pipe 121, the water inlet pipe 121 can be preheated to reduce the temperature difference, thereby effectively protecting the water inlet pipe 121.

[0041] Combine Figure 4 and Figure 5 As shown, Figure 4 Shown Figure 3 The enlarged view of part A in the middle Figure 5 In some embodiments, to ensure a good heating effect, the heating wire 132 is arranged to wrap around the outer periphery of the water inlet pipe 121 along the extension direction of the water inlet pipe 121 to increase the contact area between the heating wire 132 and the wall of the water inlet pipe 121.

[0042] In the embodiment of the present application, the heating wire 132 is arranged in an S-shape along the extension direction of the water inlet pipe 121 to increase the contact area between the heating wire 132 and the water inlet pipe 121, thereby improving the heating effect. It is understood that in other embodiments, the heating wire 132 can also be configured as a spiral structure and wrapped around the periphery of the water inlet pipe 121. The operator can modify it according to actual assembly requirements as long as the contact area between the heating wire 132 and the water inlet pipe 121 is increased.

[0043] In some other embodiments, the heating unit 13 also includes an adhesive layer 133 provided between the protective film 131 and the water inlet pipe 121. In the embodiment of the present application, the adhesive layer 133 can specifically be a double-sided adhesive layer bonded between the protective film 131 and the water inlet pipe 121. During actual assembly, the adhesiveness of the adhesive layer 133 can be used to achieve relative fixation between the protective film 131, the heating wire 132 and the outer wall of the water inlet pipe 121, thereby ensuring the stability of heating. In some other embodiments, the heating unit 13 also includes a thermal insulation layer 134 wrapped around the outer periphery of the protective film 131, wherein the thermal insulation layer 134 can specifically be composed of silicone foam, and the thermal insulation layer 134 can reduce the heat loss caused by the contact between the heating unit 13 and the air.

[0044] Continue reading Figure 1 As shown, in some embodiments, the battery pack further includes a switch unit 14 electrically connected between the temperature rising unit 13 and the battery cell system 3. The switch unit 14 includes but is not limited to a battery BUD (Battery Energy Distribution Unit) unit for controlling the conduction and disconnection of the circuit between the temperature rising unit 13 and the battery cell system 3.

[0045] In some other embodiments, the battery pack also includes a connecting unit for electrically connecting the switch unit 14 to the battery cell system 3, and the connecting unit includes a positive copper bus 151 and a negative copper bus 152 arranged at intervals, wherein the positive copper bus 151 is used to electrically connect the positive pole of the switch unit 14 to the positive output pole of the battery cell system 3, and the negative copper bus 152 is used to electrically connect the negative pole of the switch unit 14 to the negative output pole of the battery cell system 3.

[0046] Furthermore, in some other embodiments, the battery pack also includes a connecting harness 16 accommodated in the installation area 5. The connecting harness 16 is connected between the switch unit 14 and the heating unit 13 to electrically connect the heating wire 132 to the switch unit 14. Specifically, the connecting harness 16 includes a positive connection end and a negative connection end, so that the current of the battery cell system 3 can flow through the positive copper bus 151, the switch unit 14, the positive connection end of the connecting harness 16, the heating wire 132, the negative connection end of the connecting harness 16, and the negative copper bus 152 in sequence. After being energized, the heating wire 132 quickly heats up, causing the temperature of the coolant flowing through the water inlet pipe 121 to increase. After entering the liquid cooling plate 11, the heat is transferred to the battery cell system 3 through the thermal conductive adhesive layer 4, ultimately increasing the temperature of the battery cell system 3.

[0047] In the above embodiment, the installation area 5 includes a first installation area and a second installation area, wherein the battery cell system 3 is installed in the first installation area, and the switch unit 14, the water inlet pipe 121, and the water outlet pipe 122 are sequentially arranged side by side in the second installation area. By arranging the switch unit 14 and the water inlet pipe 121 and the water outlet pipe 122 of the water pipe unit 12 side by side, with the water inlet pipe 121 located between the switch unit 14 and the water outlet pipe 122, the water inlet pipe 121 and the switch unit 14 can be brought closer together, thereby facilitating the routing of the connecting wire harness 16 and shortening the overall length of the connecting wire harness 16, thereby achieving rational utilization of the internal space of the installation area 5 and improving space utilization.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A heating component, characterized in that: The heating assembly comprises: Liquid cooling plate, used to contact the battery cell system to achieve heat exchange; a water inlet pipe connected to the liquid cooling plate; and The heating unit includes a protective film and a heating wire. The protective film is coated on the periphery of the water inlet pipe. The heating wire is clamped between the protective film and the outer wall of the water inlet pipe. The heating wire can be electrically connected to the battery core system.

2. The heating assembly according to claim 1, wherein The temperature rising unit further includes an adhesive layer, which is bonded between the protective film and the water inlet pipe.

3. The heating assembly according to claim 1, wherein The temperature rising unit further includes a heat-insulating layer, and the heat-insulating layer is coated on the periphery of the protective film.

4. The heating assembly according to claim 1, wherein: The heating wire is arranged around the periphery of the water inlet pipe along the extending direction of the water inlet pipe.

5. The heating assembly according to claim 1, wherein: The heating wire is arranged in an S shape along the extension direction of the water inlet pipe.

6. A battery pack, characterized in that: include: The housing comprises an upper cover, a bottom guard plate, and a box body connected between the upper cover and the bottom guard plate, wherein an installation area is formed between the upper cover, the box body, and the bottom guard plate; A battery cell system is accommodated in the installation area; as well as The heating assembly according to any one of claims 1 to 5 is arranged in the installation interval, and the liquid cooling plate is in contact with the battery cell system to achieve heat exchange.

7. The battery pack according to claim 6, characterized in that: The battery pack further includes a switch unit, which electrically connects the temperature increasing unit to the battery cell system and can control the on / off of the circuit between the temperature increasing unit and the battery cell system.

8. The battery pack according to claim 7, characterized in that: The battery pack also includes a connecting unit that electrically connects the switch unit to the battery cell system. The connecting unit includes a positive copper busbar and a negative copper busbar. The positive copper busbar is used to electrically connect the switch unit to the positive electrode of the battery cell system, and the negative copper busbar is used to electrically connect the switch unit to the negative electrode of the battery cell system.

9. The battery pack according to claim 7, characterized in that: The battery pack further includes a connecting harness accommodated in the installation area, wherein the connecting harness is connected between the switch unit and the temperature increasing unit to electrically connect the heating wire to the switch unit.

10. The battery pack according to any one of claims 7 to 9, characterized in that: The installation interval includes a first installation interval and a second installation interval, and the heating assembly further includes a water outlet pipe, wherein the battery cell system is installed in the first installation interval, and the switch unit, the water inlet pipe and the water outlet pipe are sequentially arranged side by side in the second installation interval.

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