Battery module convenient for temperature adjustment

Abstract

The invention provides a battery module convenient for temperature adjustment, the module comprises a plurality of battery units arranged in parallel, a heat conduction module is arranged between two adjacent battery units, the heat conduction module is of a hollow structure, and the heat conduction module is filled with heat conduction oil; the heat conduction module is in an inverted T shape and comprises a heat conduction part and a heat conduction oil storage part which are sequentially arranged from top to bottom. The heat conduction part is a hollow plate and is tightly attached to the battery unit, and the surface area of the heat conduction part is smaller than or equal to that of the battery unit; the heat conduction oil storage part is positioned below the battery unit, and the heat conduction part and the heat conduction oil storage part are communicated with each other; the heat conduction module further comprises an oil guide pipe, and the oil guide pipe is arranged on the side face of the heat conduction part. One end of the oil conduit is communicated with the top end of the heat conduction part, and the other end is communicated with the heat conduction oil storage part; the oil guide pipe is used for backflow and heat dissipation of heat conduction oil. In the working process of the battery module, the battery units can generate a large amount of heat, and the temperature of the heat-conducting oil in the heat-conducting part rises, so that the heat-conducting oil in the heat-conducting part flows upwards and flows back to the heat-conducting oil storage part through the oil guide pipe to form a heat dissipation circulation loop.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery module that is easy to adjust temperature, and is used for cooling or heating the battery module. Background Art

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can continue to be used by activating the active materials by charging after the battery is discharged; while battery modules refer to the packaging, encapsulation and assembly of multiple secondary batteries to form a battery pack of a specific shape.

[0003] The charging and discharging capacity of the battery is closely related to the temperature. However, a large amount of heat is generated during the charging and discharging process of the battery. If the heat is not dissipated in time, it will affect the service life of the battery. In order to improve the performance of the battery module, the battery module needs to be effectively cooled when the temperature is too high so that the battery module can work normally. In order to dissipate the heat of the battery module, thermal management is usually carried out by thermal oil or air cooling. The heat is not easy to dissipate in time in places where the batteries are densely packed, resulting in low battery charging and discharging efficiency, reducing the battery life and affecting the safety of use. In addition, the uneven distribution of battery temperature causes inconsistent battery capacity attenuation, resulting in a shortened overall life of the battery module, affecting the service life and range of electric vehicles.

[0004] CN 201620790432.1 discloses a battery pack that uses heat transfer oil for thermal management, including an oil pipe, a rectangular battery pack box, and a plurality of battery cells arranged in a transverse and close relationship in the battery pack box; the battery cell includes a rectangular battery and a rectangular fixing plate fixed on the upper part of the battery; a plurality of semicircular fixing plate through holes are evenly distributed on the edges of both sides of the fixing plate, and a battery through hole that penetrates transversely is provided at the lower part of the battery; the upper part of the oil pipe is in a handle shape, one end of which is connected to the top of the side of the battery pack box, and the other end is connected to the bottom of the other side of the battery pack box, and the space in the battery pack box and the oil pipe is filled with heat transfer oil. Since the battery expands and contracts during the cycle, its sealing is not good, and the heat transfer oil can easily enter the battery, causing safety problems and reducing the service life of the battery module. Summary of the invention

[0005] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a battery module that is easy to adjust the temperature, so as to solve the problems of "short service life of the battery module, low charging and discharging efficiency, inconsistent battery capacity attenuation and poor safety" in the prior art.

[0006] The present invention provides a battery module that is easy to adjust temperature, comprising a plurality of battery cells arranged in parallel, a heat conduction module is arranged between two adjacent battery cells, the heat conduction module is a hollow structure, and the heat conduction module is filled with heat conduction oil;

[0007] The heat conduction module is in an inverted "T-shape", and includes a heat conduction part and a heat conduction oil storage part arranged in sequence from top to bottom; the heat conduction part is a hollow plate, the heat conduction part is closely attached to the battery unit, and the surface area of ​​the heat conduction part is less than or equal to the surface area of ​​the battery unit; the heat conduction oil storage part is located below the battery unit, and the heat conduction part and the heat conduction oil storage part are interconnected;

[0008] The heat transfer module further comprises an oil pipe, which is arranged on the side of the heat transfer part; one end of the oil pipe is connected to the top of the heat transfer part, and the other end is connected to the heat transfer oil storage part; the oil pipe is used for the reflux and heat dissipation of the heat transfer oil;

[0009] During the operation of the battery module, the battery cells will generate a large amount of heat, and the temperature of the thermal oil inside the heat transfer part will rise, causing the thermal oil in the heat transfer part to flow upward and return to the thermal oil storage part through the oil pipe, forming a heat dissipation circulation loop.

[0010] In a possible implementation, a heating module is provided at the bottom of the thermal oil storage portion for heating the thermal oil, which is beneficial to improving the low-temperature discharge performance of the battery module.

[0011] In a possible implementation manner, the oil guiding pipes are symmetrically arranged on both sides of the heat conducting part. By arranging two symmetrical oil guiding pipes, it is beneficial for the heat conducting oil to quickly flow back after being heated, thereby improving the heat dissipation efficiency.

[0012] In a possible implementation manner, a one-way valve is provided on the oil guide pipe, and the above-mentioned arrangement can prevent the heat transfer oil from flowing back.

[0013] In a possible implementation, a cooling mechanism is provided on the outer side of the oil guide pipe, preferably a fan cooling mechanism. By setting the above method, the cooling rate of the heat transfer oil is further improved.

[0014] In a possible implementation, a plurality of guide tubes are provided in the heat conducting part, and the guide tubes are arranged side by side in the vertical direction. By arranging in the above manner, the uniform flow of the heat conducting oil is promoted and the heat dissipation effect is improved.

[0015] In a possible implementation, a thermally conductive adhesive layer is provided between the battery unit and the thermally conductive module. By providing the above-mentioned manner, the heat transfer coefficient between the battery unit and the thermally conductive module is increased, thereby improving the heat dissipation effect.

[0016] In a possible implementation, the battery cells on opposite sides are connected to the inner side of the housing via an insulating plate. By setting the above method, the insulation performance of the battery module is improved.

[0017] In a possible implementation, the heat conducting part is made of a metal material with good elasticity, preferably stainless steel, titanium alloy, or nickel-based alloy. The above materials have good elasticity and fatigue resistance, and improve the resilience of the heat conducting part.

[0018] In a possible implementation, the oil guide pipe is made of copper-nickel alloy, which is a material with good heat dissipation performance, which is beneficial to improving the heat dissipation effect of the oil guide pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The module is provided with a heat-conducting module between two adjacent battery cells. The heat-conducting module is a hollow structure and is filled with heat-conducting oil. The heat-conducting module comprises a heat-conducting part, a heat-conducting oil storage part and an oil-conducting pipe. The heat-conducting part is tightly fitted with the battery cell, and the heat-conducting oil storage part is located below the battery cell. The oil-conducting pipe is arranged on the side of the heat-conducting part. One end of the oil-conducting pipe is connected with the top of the heat-conducting part, and the other end thereof is connected with the heat-conducting oil storage part. The present invention completely isolates the heat-conducting oil and the battery cell, and there is no contact between the two, which effectively improves the safety performance of the battery module. The heat-conducting modules are not connected and dissipate heat independently, which greatly improves the service life and reduces the subsequent maintenance cost.

[0021] 2. During the charging and discharging process of the module, the battery cells will generate a large amount of heat, and the heat generated by the battery cells will be transferred to the surface of the heat transfer part. There is a certain temperature difference between the surface temperature of the heat transfer part and the heat transfer oil. Due to the effects of convection and radiation, the heat will be transferred to the nearby heat transfer oil, so that the temperature of the heat transfer oil gradually rises, and the flow rate of the high-temperature heat transfer oil increases, so that the heat transfer oil in the heat transfer part flows upward and flows back to the heat transfer oil storage part through the oil pipe, thereby achieving a cooling effect (the storage part has a large amount of heat transfer oil and a low initial temperature); at the same time, the heat is dissipated outward through the oil pipe, and the temperature of the heat transfer oil is further reduced after the heat is transferred, and the low-temperature heat transfer oil fills the vacancy of the high-temperature heat transfer oil. Therefore, no external force is needed to form a heat dissipation cycle to continuously cool the battery module.

[0022] 3. The module is provided with a one-way valve on the oil guide pipe. By setting the above method, the backflow of the heat transfer oil is avoided, and a plurality of guide pipes are provided in the heat transfer part. The guide pipes are arranged side by side in the vertical direction. By setting the above method, the heat transfer oil is promoted to flow evenly, which greatly improves the heat dissipation effect.

[0023] 4. By setting a heating module at the bottom of the thermal oil storage part to heat the thermal oil, it is beneficial to improve the low-temperature discharge performance of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram showing the positions of the battery unit and the heat conduction module;

[0026] Figure 2 A schematic diagram showing the positions of the battery cells and the heat conduction module in the module;

[0027] Figure 3 A structural schematic diagram of a heat conduction module is shown;

[0028] Figure 4 Another structural schematic diagram of a heat conduction module is shown;

[0029] Figure 5 A schematic diagram showing a thermally conductive adhesive layer provided between a battery unit and a thermally conductive module is shown;

[0030] Figure 6 A structural schematic diagram of a battery module is shown;

[0031] Figure 7 Another structural schematic diagram of a battery module is shown;

[0032] Figure 8 A schematic diagram showing the positions of the heat conduction module and the heating module in the module;

[0033] Description of main component symbols:

[0034] 100, battery cell; 200, heat conduction module; 201, heat conduction part; 202, heat conduction oil storage part; 203, oil guide pipe; 204, one-way valve; 205, guide pipe; 300, cooling fan; 400, heat conduction adhesive layer; 500, insulation board; 600, housing; 700, heating module. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] Embodiment 1

[0041] See also Figures 1 to 3 A battery module that is easy to adjust temperature includes a plurality of battery cells 100 arranged in parallel, a heat conduction module 200 is provided between two adjacent battery cells 100, the heat conduction module 200 is a hollow structure, and the heat conduction module 200 is filled with heat conduction oil;

[0042] The heat-conducting module 200 is in an inverted "T-shape", and includes a heat-conducting portion 201 and a heat-conducting oil storage portion 202 arranged in sequence from top to bottom; the heat-conducting portion 201 is a hollow plate, and the heat-conducting portion 201 is closely attached to the battery cell 100, and the surface area of ​​the heat-conducting portion 201 is less than or equal to the surface area of ​​the battery cell 100; the heat-conducting oil storage portion 202 is located below the battery cell 100, and the heat-conducting portion 201 and the heat-conducting oil storage portion 202 are connected to each other;

[0043] The heat transfer module 200 further includes an oil pipe 203, which is disposed on the side of the heat transfer part 201; one end of the oil pipe 203 is connected to the top of the heat transfer part 201, and the other end is connected to the heat transfer oil storage part 202; the oil pipe 203 is used for the reflux and heat dissipation of the heat transfer oil;

[0044] During the operation of the battery module, the battery cell 100 generates a large amount of heat, and the temperature of the thermal oil inside the thermal conductive part 201 rises, causing the thermal oil in the thermal conductive part 201 to flow upward and return to the thermal oil storage part 202 through the oil pipe 203, forming a heat dissipation circulation loop.

[0045] In some embodiments, the oil conducting pipes 203 are symmetrically arranged on both sides of the heat conducting part 201. By providing two symmetrical oil conducting pipes 203, it is beneficial for the heat conducting oil to quickly return after being heated, thereby improving the heat dissipation efficiency.

[0046] In some embodiments, a one-way valve 204 is provided on the oil guide pipe 203. By providing the above-mentioned arrangement, the backflow of the heat transfer oil can be avoided.

[0047] In other optional embodiments, a liquid cooling mechanism or other cooling methods are provided on the outer side of the oil guide pipe 203 .

[0048] See also Figure 4 In some embodiments, a plurality of guide tubes 205 are provided in the heat conducting part 201, and the guide tubes 205 are arranged side by side in the vertical direction. By arranging in the above manner, the heat conducting oil is promoted to flow evenly and the heat dissipation effect is improved.

[0049] See also Figure 5 In some embodiments, a thermally conductive adhesive layer 400 is provided between the battery cell 100 and the thermally conductive module 200. By providing the above-mentioned manner, the heat transfer coefficient between the battery cell 100 and the thermally conductive module 200 is improved, thereby improving the heat dissipation effect.

[0050] In some preferred embodiments, the thermally conductive adhesive is made of organic silica gel, and is added with fillers, thermally conductive materials and other polymer materials, so as to have good thermal conductivity and electrical insulation properties.

[0051] See also Figure 6In some embodiments, the battery cells 100 on opposite sides are connected to the inner side of the housing 600 through the insulating plate 500. By setting the above method, the insulation performance of the battery module is improved.

[0052] See also Figure 7 In some embodiments, a heat dissipation fan 300 is provided on the outer side of the oil guide pipe 203. By setting the above method, the cooling rate of the heat transfer oil is further improved.

[0053] In some embodiments, the heat conducting part 201 is made of a metal material with good elasticity, preferably stainless steel, titanium alloy, or nickel-based alloy. The above materials have good elasticity and fatigue resistance, and improve the resilience of the heat conducting part 201 .

[0054] In some embodiments, the oil guide tube 203 is made of copper-nickel alloy, which is a material with good heat dissipation performance, which is beneficial to improving the heat dissipation effect of the oil guide tube 203.

[0055] In some embodiments, the heat transfer oil is not easy to burn, not easy to cause electronic short circuits, sparks, and ensures good heat transfer properties of the heat transfer oil.

[0056] Embodiment 2

[0057] See also Figure 8 A heating module 700 is provided at the bottom of the thermal oil storage unit 202 to heat the thermal oil, which is beneficial to improving the low-temperature discharge performance of the battery module. The heating module 700 is an existing mature technology, and can be made of resistance wire, heating plate, infrared heating, etc.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A battery module that is easy to adjust temperature, comprising a plurality of battery cells (100) arranged in parallel, characterized in that: A heat conduction module (200) is provided between two adjacent battery units (100), wherein the heat conduction module (200) is a hollow structure and is filled with heat conduction oil; The heat conduction module (200) is in an inverted "T-shape", and comprises a heat conduction portion (201) and a heat conduction oil storage portion (202) which are arranged in sequence from top to bottom; the heat conduction portion (201) is a hollow plate, the heat conduction portion (201) is tightly fitted with the battery unit (100), and the surface area of ​​the heat conduction portion (201) is less than or equal to the surface area of ​​the battery unit (100); the heat conduction oil storage portion (202) is located below the battery unit (100), and the heat conduction portion (201) and the heat conduction oil storage portion (202) are interconnected; The heat conduction module (200) further comprises an oil guide pipe (203), wherein the oil guide pipe (203) is arranged on the side of the heat conduction part (201); one end of the oil guide pipe (203) is connected to the top end of the heat conduction part (201), and the other end thereof is connected to the heat conduction oil storage part (202); the oil guide pipe (203) is used for the reflux and heat dissipation of the heat conduction oil; During the operation of the battery module, the battery unit (100) generates a large amount of heat, and the temperature of the heat transfer oil inside the heat transfer part (201) rises, causing the heat transfer oil in the heat transfer part (201) to flow upward and flow back to the heat transfer oil storage part (202) through the oil transfer pipe (203), thereby forming a heat dissipation circulation loop.

2. A battery module that is easy to adjust temperature according to claim 1, characterized in that: A heating module (700) is provided at the bottom of the heat transfer oil storage portion (202) for heating the heat transfer oil.

3. A battery module that is easy to adjust temperature according to claim 1, characterized in that: The oil guide pipes (203) are symmetrically arranged on both sides of the heat conduction portion (201).

4. A battery module that is easy to adjust temperature according to claim 1 or 3, characterized in that: The oil guide pipe (203) is provided with a one-way valve (204).

5. A battery module that is easy to adjust temperature according to claim 1 or 3, characterized in that: A cooling mechanism is provided on the outer side of the oil guide pipe (203).

6. A battery module that is easy to adjust temperature according to claim 1, characterized in that: A plurality of guide tubes (205) are arranged in the heat conduction portion (201), and the guide tubes (205) are arranged side by side in the vertical direction.

7. A battery module that is easy to adjust temperature according to claim 5, characterized in that: The temperature reduction mechanism adopts a heat dissipation fan (300).

8. A battery module that is easy to adjust temperature according to claim 1, characterized in that: A heat-conducting adhesive layer (400) is provided between the battery unit (100) and the heat-conducting module (200).

9. A battery module that is easy to adjust temperature according to claim 1, characterized in that: The battery cells (100) on two opposite sides are connected to the inner side surface of the housing (600) via an insulating plate (500).

10. A battery module that is easy to adjust temperature according to claim 1, characterized in that: The heat conducting part (201) is made of a metal material with good elasticity, preferably stainless steel, titanium alloy, or nickel-based alloy.

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