Battery pack, current collector and power device

Abstract

The utility model discloses a battery pack, a current collector and a power device, the battery pack comprises a shell, a current collector and a power device, the shell is internally provided with an accommodating cavity; the battery cell is arranged in the accommodating cavity, the battery cell comprises a current collector, and a cooling flow channel is formed in the current collector. According to the battery pack disclosed by the utility model, the cooling flow channel is formed in the current collector, so that the overall temperature of the battery cell is relatively low when the battery cell is used, the uniformity of temperature distribution in the battery cell is ensured, and the temperature gradient is avoided, so that the risk of thermal runaway is effectively reduced, the safety coefficient of the battery pack is improved, and faults are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery pack, a current collector and a power device. Background Art

[0002] In recent years, with my country attaching great importance to the development of the new energy vehicle industry, the scale of new energy power batteries has continued to develop well. The number of policies on the new energy vehicle power battery industry in various regions across the country has gradually increased; at the same time, the proposal of the dual carbon goals and the construction of new power systems are driving the development of the energy storage industry. In such an environment, the market demand for batteries is also increasing year by year.

[0003] Thermal runaway is still a pain point for batteries. Existing batteries generate a lot of heat when in use. If it is not removed in time, the battery will be damaged due to high temperature. The most widely used method is to arrange cooling outside the battery cell at the module or pack end, but the cooling effect of this cooling form is not particularly obvious, so a better heat dissipation method is urgently needed.

[0004] Currently, the heat dissipation of battery cells, whether active or passive, is basically concentrated on the module and Pack end, including Kirin's large-surface water cooling and conventional large-surface water cooling, both of which are aimed at the external heat dissipation of the battery cells. This heat dissipation method can take away the heat on the surface of the battery cell, but the heat inside the battery cell obviously cannot be removed in time. On the one hand, this heat dissipation method will make the battery cell temperature higher, and on the other hand, it will cause a temperature gradient inside the battery cell. Both of these problems will cause the battery cell to have the risk of thermal runaway. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery pack, which can ensure uniform temperature distribution inside the battery core and avoid the generation of temperature gradient.

[0006] The utility model also provides a current collector.

[0007] The utility model also provides a power device.

[0008] According to the first aspect of the utility model, the battery pack comprises: a shell having a receiving cavity formed therein; a battery cell disposed in the receiving cavity, the battery cell comprising a current collector having a cooling channel formed therein.

[0009] According to the battery pack of the present invention, by forming a cooling channel in the current collector, the overall temperature of the battery cell can be kept low during use, and the uniformity of the temperature distribution inside the battery cell is ensured to avoid the generation of temperature gradients, thereby effectively reducing the risk of thermal runaway, improving the safety factor of the battery pack, and avoiding the occurrence of malfunctions.

[0010] In some embodiments, the battery pack further includes: a shunt connected to both ends of the cooling channel and in communication with the cooling channel.

[0011] In some embodiments, a water inlet and a water outlet are formed on the shell, and the diverter includes two, one end of one of the two diverters is connected to the shell and communicated with the water inlet, and one end of the other of the two diverters is connected to the shell and communicated with the water outlet.

[0012] In some embodiments, a water inlet pipe and a water outlet pipe are provided on the shell, the water inlet pipe is connected to the water inlet and communicates with the water inlet, and the water outlet pipe is connected to the water outlet and communicates with the water outlet.

[0013] In some embodiments, the cooling channel is provided with an insulating coolant that can flow in the cooling channel.

[0014] In some embodiments, the insulating coolant has a Reynolds number Re<10000.

[0015] In some embodiments, the cooling channel comprises at least one cooling channel, and the at least one cooling channel extends along a straight line or a curve.

[0016] In some embodiments, the ratio of the cross-sectional area of ​​the cooling channel to the cross-sectional area of ​​the current collector is between 0.1 and 0.9.

[0017] According to the current collector of the second aspect of the utility model, a cooling channel is formed in the current collector, and an insulating coolant that can flow in the cooling channel is provided in the cooling channel. The cooling channel includes at least one cooling channel, and at least one cooling channel extends along a straight line or a curve.

[0018] According to the current collector of the utility model, by forming a cooling flow channel in the current collector, the overall temperature of the battery cell can be kept low during use, and the uniformity of the temperature distribution inside the battery cell is ensured to avoid the generation of temperature gradients, thereby effectively reducing the risk of thermal runaway, improving the safety factor of the battery pack, and avoiding the occurrence of failures.

[0019] The power device according to the third aspect of the utility model comprises the battery pack according to the first aspect of the utility model or the current collector according to the second aspect of the utility model.

[0020] According to the power device of the utility model, by providing the battery pack of the first aspect or the current collector of the second aspect of the utility model, the risk factor of the power device is reduced, and the safety performance and product quality of the power device are improved.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 A schematic diagram of a front view of a battery pack shown in ;

[0024] Figure 3 yes Figure 2 A partial enlarged schematic diagram of the battery pack shown in ;

[0025] Figure 4 yes Figure 1 Schematic diagram of the current collector of the battery cell shown in ;

[0026] Figure 5 yes Figure 4 A schematic diagram of the structure of the current collector shown in ;

[0027] Figure 6 yes Figure 4 Another structural schematic diagram of the current collector shown in .

[0028] Reference numerals:

[0029] 100. Battery pack;

[0030] 1. Shell; 11. Water inlet pipe; 12. Water outlet pipe;

[0031] 2. Battery cell; 21. Current collector; 211. Cooling channel;

[0032] 3. Diverter. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Reference below Figure 1-Figure 6 A battery pack 100 according to an embodiment of the first aspect of the present invention is described.

[0035] like Figure 1 As shown, the battery pack 100 according to the first embodiment of the utility model includes: a shell 1 and a battery cell 2.

[0036] Specifically, a housing 1 is formed with a receiving cavity, a battery cell 2 is disposed in the receiving cavity, and the battery cell 2 includes a current collector 21, and the current collector 21 is formed with a cooling channel 211. Therefore, when the battery cell is charged and discharged, the heat generated can be absorbed by the current collector 21, and since the current collector 21 and the cooling channel 211 take away the heat of the battery cell, the overall temperature of the battery cell can be kept at a low level. At the same time, since each pole piece can absorb heat, the temperature distribution inside all the battery cells is uniform, and there will be no large temperature gradient.

[0037] According to the battery pack 100 of the embodiment of the utility model, by forming a cooling channel 211 in the current collector 21, the overall temperature of the battery cell can be kept low during use, and the uniformity of the temperature distribution inside the battery cell is ensured to avoid the generation of temperature gradients, thereby effectively reducing the risk of thermal runaway, improving the safety factor of the battery pack 100, and avoiding the occurrence of failures.

[0038] In some embodiments of the present invention, Figure 2 As shown, the battery pack 100 further includes: a shunt 3, which is connected to both ends of the cooling channel 211 and communicates with the cooling channel 211. Thus, the coolant can be shunted into the cooling channel 211 through the shunt 3, and after the coolant exchanges heat, it converges from the cooling channel 211 to the shunt 3, which simplifies the internal structure of the battery pack 100, reduces the difficulty of assembly, and improves production efficiency.

[0039] In some embodiments of the utility model, a water inlet and a water outlet are formed on the housing 1, and the diverter 3 includes two, one end of one of the two diverters 3 is connected to the housing 1 and communicated with the water inlet, and one end of the other of the two diverters 3 is connected to the housing 1 and communicated with the water outlet. Figure 2 As shown, the left end of the diverter 3 on the left is connected to the housing 1 and communicated with the water inlet, and the right end of the diverter 3 on the right is connected to the housing 1 and communicated with the water outlet. Therefore, the diverter 3 simplifies the structure of the housing 1 and ensures the safety of the interior of the housing 1, preventing the coolant from leaking into the accommodating cavity.

[0040] In some embodiments of the utility model, a water inlet pipe 11 and a water outlet pipe 12 are provided on the housing 1. The water inlet pipe 11 is connected to the water inlet and communicates with the water inlet, and the water outlet pipe 12 is connected to the water outlet and communicates with the water outlet. Therefore, the provision of the water inlet pipe 11 and the water outlet pipe 12 prevents the coolant from flowing along the side wall of the housing 1 onto the housing 1, ensures the dryness of the inside of the battery pack 100, and improves the safety of the battery pack 100.

[0041] In some embodiments of the present invention, an insulating coolant is provided in the cooling channel 211 and can flow in the cooling channel 211. Preferably, the insulating coolant is silicone oil.

[0042] In some embodiments of the present invention, the Reynolds number of the insulating coolant is Re<10000. Thus, the flow rate of the coolant is prevented from being too fast, and the cooling effect is improved. For example, the Reynolds number of the insulating coolant can be: 9000, 9800, 9700, 9600, 9500, 9400, 9300, 9200, 9100, 9000, 8500, 8000, etc.

[0043] In some embodiments of the present invention, the cooling channel 211 includes at least one cooling channel 211, and the at least one cooling channel 211 extends along a straight line or a curve. Figure 5 As shown, the cooling channel 211 includes a plurality of cooling channels 211, and the plurality of cooling channels 211 are arranged in parallel in the width direction of the current collector 21, and each cooling channel 211 extends along a straight line; Figure 6 As shown, a plurality of cooling channels 211 are arranged in parallel in the width direction of the current collector 21, and each cooling channel 211 extends along a curve; or, the cooling channel 211 includes one cooling channel 211, and one cooling channel 211 extends along an S shape. Thus, the cooling effect of the cooling channel 211 is improved, ensuring that the interior of the battery pack 100 can be effectively cooled.

[0044] In some embodiments of the present invention, the ratio of the cross-sectional area of ​​the cooling channel 211 to the cross-sectional area of ​​the current collector 21 is between 0.1 and 0.9. For example, the ratio of the cross-sectional area of ​​the cooling channel 211 to the cross-sectional area of ​​the current collector 21 can be: 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, etc.

[0045] According to the current collector 21 of the second aspect of the utility model, a cooling channel 211 is formed in the current collector 21. The cooling channel 211 is provided with an insulating coolant that can flow in the cooling channel 211. The cooling channel 211 includes at least one cooling channel 211, and at least one cooling channel 211 extends along a straight line or a curve.

[0046] According to the current collector 21 of the embodiment of the utility model, by forming a cooling channel 211 in the current collector 21, the overall temperature of the battery cell can be kept low during use, and the uniformity of the temperature distribution inside the battery cell is ensured to avoid the generation of temperature gradients, thereby effectively reducing the risk of thermal runaway, improving the safety factor of the battery pack 100, and avoiding the occurrence of failures.

[0047] The power device according to the third aspect of the present invention includes the battery pack 100 according to the first aspect of the present invention or the current collector 21 according to the second aspect of the present invention.

[0048] According to the power device of the embodiment of the utility model, by providing the battery pack 100 of the first embodiment or the current collector 21 of the second embodiment of the utility model, the risk factor of the power device is reduced and the safety performance and product quality of the power device are improved.

[0049] 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 a limitation on the present invention.

[0050] 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 utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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, an electrical connection, or a communication; 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.

[0052] 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 utility model. 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.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A housing having a receiving cavity formed therein; A battery cell, the battery cell is arranged in the accommodation cavity, the battery cell comprises a current collector, and the current collector is formed with a cooling flow channel; A flow divider is connected to two ends of the cooling channel and communicates with the cooling channel.

2. The battery pack according to claim 1, characterized in that: A water inlet and a water outlet are formed on the shell, and the diverter includes two. One end of one of the two diverters is connected to the shell and communicated with the water inlet, and one end of the other of the two diverters is connected to the shell and communicated with the water outlet.

3. The battery pack according to claim 2, characterized in that: The shell is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is connected to the water inlet and communicated with the water inlet, and the water outlet pipe is connected to the water outlet and communicated with the water outlet.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The cooling channel is provided with an insulating coolant that can flow in the cooling channel.

5. The battery pack according to claim 4, characterized in that: The Reynolds number of the insulating coolant is Re <10000.

6. The battery pack according to any one of claims 1 to 3, characterized in that: The cooling channel comprises at least one cooling channel, and the at least one cooling channel extends along a straight line or a curve.

7. The battery pack according to any one of claims 1 to 3, characterized in that: The ratio of the cross-sectional area of ​​the cooling channel to the cross-sectional area of ​​the current collector is between 0.1 and 0.

9.

8. A current collector, characterized in that: A cooling channel is formed in the current collector. The cooling channel is provided with an insulating coolant that can flow in the cooling channel. The cooling channel includes at least one cooling channel, and at least one cooling channel extends along a straight line or a curve.

9. A power device, characterized in that: A battery pack comprising any one of claims 1 to 7 or a current collector according to claim 8.

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