Battery pack

Abstract

The battery pack comprises a battery cell and a busbar, the battery cell is provided with a pole, the pole comprises a pole body and a pole seat, the pole body is arranged on the pole seat, the pole body forms a heat dissipation cavity which is opened in the direction away from the pole seat, and heat dissipation media are arranged in the heat dissipation cavity. The busbar is connected with one end, deviating from the pole seat, of the pole body. According to the battery pack disclosed by the embodiment of the utility model, the temperature at the connecting position of the pole body and the busbar is reduced through the heat dissipation medium, so that the temperature at the connecting position of the busbar and the pole body can be controlled within a safe range, and the safety and the stability of the battery pack are favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] A battery pack usually contains multiple battery cells connected by a bus. With the rapid development of the battery industry, the energy density and charging rate of the battery pack are also constantly improving. However, in related technologies, when a large current passes through the connection between the bus and the pole, the local temperature will be too high and the heat cannot be dissipated in time, which directly affects the safety and stability of the battery pack. Utility Model Content

[0003] The utility model provides a battery pack, which has the advantages of high safety and stability.

[0004] The battery pack according to the embodiment of the utility model includes: a battery cell, wherein the battery cell has a pole, wherein the pole includes a pole body and a pole seat, wherein the pole body is arranged on the pole seat, and the pole body forms a heat dissipation cavity open toward a direction away from the pole seat, wherein the heat dissipation cavity has a heat dissipation medium; and a bus, wherein the bus is connected to one end of the pole body away from the pole seat.

[0005] According to the battery pack of the embodiment of the utility model, the temperature at the connection position between the pole body and the bus bar is reduced by the heat dissipation medium, so that the temperature at the connection position between the bus bar and the pole body can be controlled within a safe range, which is beneficial to improving the safety and stability of the battery pack.

[0006] According to some embodiments of the present invention, the heat dissipation medium is a phase change heat absorbing material.

[0007] According to some embodiments of the present invention, a heat dissipation hole is formed on the bus bar and is opposite to the opening of the heat dissipation cavity.

[0008] According to some embodiments of the present invention, the heat dissipation medium is a heat-conducting material piece, one end of the heat-conducting material piece is located in the heat dissipation cavity, and the other end of the heat-conducting material piece extends to the outside of the heat dissipation cavity.

[0009] According to some embodiments of the utility model, a heat dissipation hole opposite to the opening of the heat dissipation cavity is formed on the busbar, the heat conductive material piece is passed through the heat dissipation hole and the other end of the heat conductive material piece extends to a side of the busbar away from the pole body.

[0010] According to some embodiments of the present utility model, the battery pack further includes a water cooling plate having a water cooling channel therein, and the heat dissipation cavity is connected to the water cooling channel.

[0011] According to some embodiments of the utility model, a plurality of pole bodies are provided on the pole seat, and a connecting channel connecting the plurality of heat dissipation cavities is formed on the pole seat.

[0012] According to some embodiments of the utility model, the battery pack also includes a connecting tube, a heat dissipation hole opposite to the opening of the heat dissipation cavity is formed on the bus, the connecting tube is passed through the heat dissipation hole and the two ends of the connecting tube are respectively connected to the heat dissipation cavity and the water cooling channel.

[0013] According to some embodiments of the present invention, the battery pack further includes a water cooling plate, and the distance between the pole body and the water cooling plate is less than 10 mm.

[0014] According to some embodiments of the present invention, the depth of the heat dissipation cavity is in the range of 1-4 mm; and / or the distance between the inner peripheral wall of the heat dissipation cavity and the outer peripheral wall of the pole body is in the range of 3-5 mm.

[0015] 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

[0016] Figure 1 is a schematic diagram of a battery cell, a bus bar and a water cooling plate of a battery pack according to an embodiment of the utility model;

[0017] Figure 2 is a schematic diagram of a pole of a battery pack according to an embodiment of the utility model;

[0018] Figure 3 is a cross-sectional view of a pole of a battery pack according to an embodiment of the utility model;

[0019] Figure 4 yes Figure 3 A magnified image of area A;

[0020] Figure 5 is a schematic diagram of a battery cell and a busbar of a battery pack according to an embodiment of the utility model;

[0021] Figure 6 It is a partial exploded view of the busbar and the battery cell of the battery pack according to the embodiment of the utility model;

[0022] Figure 7 It is a schematic diagram of a battery cell, a bus bar and a connecting tube of a battery pack according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] Battery pack 100;

[0025] Battery cell 1; pole 11; pole body 111; pole seat 112; heat dissipation cavity 113; communication channel 114; top cover 12; sealing structure 13; bus bar 2; heat dissipation hole 21; water cooling plate 3; connecting pipe 4. DETAILED DESCRIPTION

[0026] 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.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0028] A battery pack 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0029] like Figure 1-Figure 7As shown, the battery pack 100 according to the embodiment of the utility model comprises: a battery cell 1 and a busbar 2, the battery cell 1 has a pole 11, the pole 11 comprises a pole body 111 and a pole seat 112, the pole body 111 is arranged on the pole seat 112, the pole body 111 forms a heat dissipation cavity 113 which is open in a direction away from the pole seat 112, the heat dissipation cavity 113 contains a heat dissipation medium, and the busbar 2 is connected to one end of the pole body 111 away from the pole seat 112. That is, the heat dissipation cavity 113 has an opening which is open toward the busbar 2, and the electrical connection of multiple battery cells 1 can be realized through the busbar 2. By arranging the heat dissipation cavity 113 in the pole body 111, the weight of the pole body 111 can be reduced while ensuring the current capacity of the pole body 111. In addition, the temperature in the heat dissipation cavity 113 can be reduced by the heat dissipation medium in the heat dissipation cavity 113, thereby reducing the temperature at the connection position between the pole body 111 and the bus 2, wherein the heat dissipation medium cooling the heat dissipation cavity 113 can be achieved by absorbing the heat in the heat dissipation cavity 113 or transferring the heat in the heat dissipation cavity 113 to the outside of the heat dissipation cavity 113, and no specific restrictions are made here. Therefore, when the battery pack 100 generates a large amount of heat by a large current passing through the connection position between the pole body 111 and the bus 2 during a fast charging process, the temperature at the connection position between the pole body 111 and the bus 2 can be reduced by the heat dissipation medium, and the temperature at the connection position between the bus 2 and the pole body 111 can be controlled within a safe range, which is beneficial to improving the safety and stability of the battery pack 100.

[0030] According to the battery pack 100 of the embodiment of the utility model, the temperature at the connection position between the pole body 111 and the bus 2 is reduced by a heat dissipation medium, so that the temperature at the connection position between the bus 2 and the pole body 111 can be controlled within a safe range, which is beneficial to improving the safety and stability of the battery pack 100.

[0031] According to some embodiments of the utility model, the heat dissipation medium is a phase change heat absorbing material. Among them, the phase change heat absorbing material can absorb heat through a phase change process, such as solid liquefaction or liquid vaporization process. Therefore, when the temperature in the heat dissipation cavity 113 is too high, the phase change heat absorbing material can absorb the heat in the heat dissipation cavity 113 and the column at the connection position between the bus 2 and the pole body 111 through phase change, thereby avoiding the loss of the battery pack 100 caused by the excessive temperature at the connection position between the bus 2 and the pole body 111. In a specific example, the heat dissipation medium is a low-temperature phase change material, so that the heat dissipation medium can absorb heat through phase change at low temperature, and the phase change temperature is controllable, so as to facilitate the control of the temperature at the connection position between the bus 2 and the pole body 111 within a safe range.

[0032] According to some embodiments of the present invention, the busbar 2 is connected to the pole body 111 to block the opening of the heat dissipation cavity 113. That is, the heat dissipation cavity 113 is a closed cavity, thereby better preventing the low-temperature phase change material in the heat dissipation cavity 113 from leaking.

[0033] According to some embodiments of the present invention, a heat dissipation hole 21 is formed on the bus 2, which is opposite to the opening of the heat dissipation cavity 113, that is, the heat dissipation hole 21 is connected to the heat dissipation cavity 113. In other words, the heat dissipation cavity 113 can form a gas flow channel connected between the heat dissipation hole 21 and the space on one side of the bus 2 away from the pole body 111, wherein it can be understood that the external space of the heat dissipation cavity 113, that is, the installation space of the bus 2 and the battery cell 1, is usually temperature-controlled by a cooling structure such as a water cooling plate 3. Therefore, when a large amount of heat is generated at the connection position between the busbar 2 and the pole body 111, under the action of heat transfer, the high-temperature gas in the heat dissipation cavity 113 and at the connection position between the busbar 2 and the pole body 111 can flow toward the side of the busbar 2 away from the pole body 111, that is, the heat dissipation medium at this time is the gas in the heat dissipation cavity, thereby achieving a cooling treatment of the heat dissipation cavity 113 and the connection position between the busbar 2 and the pole body 111, and then the temperature at the connection position between the busbar 2 and the pole body 111 can be controlled within a safe range to improve the safety and stability of the battery pack 100. In addition, by providing the heat dissipation holes 21 on the busbar 2, the weight of the busbar 2 can be reduced, which is conducive to improving the lightweight level of the battery pack 100.

[0034] In a specific example, the pole 11 is disposed on the top cover 12 , and the pole 11 and the top cover 12 are sealed by a sealing structure 13 , and the sealing structure 13 is located between the busbar 2 and the top cover 12 .

[0035] According to some embodiments of the utility model, the heat dissipation medium is a heat-conducting material piece, one end of the heat-conducting material piece is located in the heat dissipation cavity 113, and the other end of the heat-conducting material piece extends to the outside of the heat dissipation cavity 113. It can be understood that the temperature of the outer space of the heat dissipation cavity 113, that is, the safe space of the bus 2 and the battery cell 1, is usually controlled by a cooling structure such as a water cooling plate 3. Therefore, when a large amount of heat is generated at the connection position between the bus 2 and the pole body 111, under the action of heat transfer, the heat-conducting material piece can form a heat transfer channel, so that the high-temperature gas in the heat dissipation cavity 113 and at the connection position between the bus 2 and the pole body 111 can be transferred to the outside of the heat dissipation cavity 113 through the heat-conducting material piece, thereby achieving a cooling treatment of the heat dissipation cavity 113 and the connection position between the bus 2 and the pole body 111, and then the temperature at the connection position between the bus 2 and the pole body 111 can be controlled within a safe range to improve the safety and stability of the battery pack 100.

[0036] According to some embodiments of the utility model, a heat dissipation hole 21 opposite to the opening of the heat dissipation cavity 113 is formed on the bus 2, that is, the heat dissipation hole 21 is connected with the heat dissipation cavity 113, and a heat conductive material piece is arranged through the heat dissipation hole 21, and the other end of the heat conductive material piece extends to the side of the bus 2 away from the pole body 111. In other words, the heat conductive material piece is arranged through the heat dissipation space, one end of the heat conductive material piece extends into the heat dissipation cavity 113, and the other end of the heat conductive material piece extends to the side of the bus 2 away from the pole body 111. Therefore, the heat in the heat dissipation cavity 113 and the connection position of the bus 2 and the pole body 111 can be transferred to the side of the bus 2 away from the pole body 111 through the heat conductive material piece, thereby realizing the temperature of the heat dissipation cavity 113 and the connection position of the bus 2 and the pole body 111, and at the same time, the difficulty of installing the heat conductive material piece can be reduced. In addition, by providing the heat dissipation holes 21 on the busbar 2 , the weight of the busbar 2 can be reduced, which is beneficial to improving the lightweight level of the battery pack 100 .

[0037] According to some embodiments of the utility model, the battery pack 100 further includes a water cooling plate 3, the water cooling plate 3 has a water cooling channel, and the heat dissipation cavity 113 is connected to the water cooling channel. The coolant cools the battery pack 100 by flowing in the water cooling channel. Therefore, the coolant can flow between the water cooling channel and the heat dissipation cavity 113 through the connection between the water cooling channel and the heat dissipation cavity 113, that is, the heat dissipation medium in the heat dissipation cavity 113 is the coolant at this time, so that the coolant can flow between the water cooling channel and the heat dissipation cavity 113 to remove the heat in the heat dissipation cavity 113 and the connection position between the bus 2 and the pole body 111, so as to reduce the temperature in the heat dissipation cavity 113 and the connection position between the bus 2 and the pole body 111.

[0038] According to some embodiments of the utility model, a plurality of pole bodies 111 are provided on the pole seat 112, that is, the pole 11 is connected to the bus 2 through the plurality of pole bodies 111, which can better increase the connection area between the pole 11 and the bus 2 to enhance the flow capacity and connection stability. Among them, a connecting channel 114 connecting the plurality of heat dissipation cavities 113 is formed on the pole seat 112. In other words, a connecting water flow channel can be formed between the plurality of heat dissipation cavities 113 through the connecting channel 114. Thus, the flow area of ​​the coolant in the pole 11 can be better increased to enhance the cooling effect of the coolant on the pole 11, and it is convenient to select and set the water inlet end and the water outlet end in the plurality of poles 11 to enhance the orderliness of the flow of the coolant in the pole 11. In a specific example, two pole bodies 111 are provided, and the two pole bodies 111 are connected by a connecting channel 114. One of the heat dissipation cavities 113 is used as the water inlet end of the water cooling channel for the coolant in the pole 11 to flow to the water cooling channel, and the other heat dissipation cavity 113 is used as the drainage section of the water cooling channel for the coolant in the pole 11 to flow to the water cooling channel, so that the coolant in the pole 11 can flow in an orderly manner, and the flow area of ​​the coolant in the pole 11 can be better increased, which is beneficial to improving the cooling effect of the coolant on the pole 11.

[0039] According to some embodiments of the utility model, the battery pack 100 further includes a connecting tube 4, a heat dissipation hole 21 is formed on the bus 2 and is opposite to the opening of the heat dissipation cavity 113, that is, the heat dissipation hole 21 is connected to the heat dissipation cavity 113, and the connecting tube 4 is passed through the heat dissipation hole 21 and the two ends of the connecting tube 4 are respectively connected to the heat dissipation cavity 113 and the water cooling channel. In other words, the heat dissipation cavity 113 is connected to the water cooling channel through the connecting tube 4. Therefore, the connection difficulty of the connecting tube 4 can be well reduced through the heat dissipation hole 21 on the bus 2. In addition, by providing the heat dissipation hole 21 on the bus 2, the weight of the bus 2 can be well reduced, which is conducive to improving the lightweight level of the battery pack 100.

[0040] According to some embodiments of the utility model, the battery pack 100 also includes a water-cooled plate 3, and the distance between the pole body 111 and the water-cooled plate 3 is less than 10 mm. For example, the distance between the pole body 111 and the water-cooled plate 3 can be 1 mm, 2 mm, 3 mm, 4 mm, 6 mm, 7 mm, 9 mm, etc., and no specific restrictions are made here. It can be understood that the water-cooled plate 3 has a relatively low temperature due to the circulating coolant therein. Therefore, by controlling the distance between the pole body 111 and the water-cooled plate 3 within a range of less than 10 mm, the path of heat transfer from the pole body 111 to the water-cooled plate 3 can be shortened, so that the heat at the connection between the pole body 111 and the bus 2 can be quickly transferred to the water-cooled plate 3 to quickly reduce the temperature at the connection position between the bus 2 and the pole body 111, and then the temperature at the connection position between the bus 2 and the pole body 111 is controlled within a safe range.

[0041] According to some embodiments of the utility model, the battery pack 100 further includes: a water cooling plate 3, a plurality of pole bodies 111 arranged along a first direction are provided on the pole seat 112, the water cooling plate 3 is located on one side of the battery cell 1 in the first direction, and in the first direction, the distance between the pole body 111 adjacent to the water cooling plate 3 and the water cooling plate 3 is less than 10 mm. In other words, the distance between the water cooling plate 3 and the nearest pole body 111 is less than 10 mm, so as to enhance the cooling effect of the water cooling plate 3 on the pole body 111.

[0042] According to some embodiments of the present invention, the depth of the heat dissipation cavity 113 ranges from 1 to 4 mm. The depth of the heat dissipation cavity 113 refers to the dimension of the heat dissipation cavity 113 in the extension direction of the pole body 111 (e.g. Figure 4 H shown in ). That is, the size of the heat dissipation cavity 113 in the extension direction of the pole body 111 is controlled within the range of 1mm to 4mm. For example, the size of the heat dissipation cavity 113 in the extension direction of the pole body 111 can be 1mm, 1.5mm, 2mm, 2.6mm, 3.2mm, 4mm, etc., and no specific restrictions are made here. In this way, it is possible to better avoid the depth of the heat dissipation cavity 113 being too deep to affect the structural strength of the pole body 111, and at the same time, it is possible to avoid the depth of the heat dissipation cavity 113 being too shallow, resulting in the space of the heat dissipation cavity 113 being too small to affect the heat dissipation effect of the heat dissipation medium, such as preventing the space for the phase change heat absorption material to be placed too small or the space for the coolant to flow too small, so that the heat dissipation effect of the heat dissipation medium on the heat dissipation cavity 113 can be ensured while ensuring the structural strength of the pole body 111.

[0043] According to some embodiments of the present invention, the distance between the inner circumferential wall of the heat dissipation cavity 113 and the outer circumferential wall of the pole body 111 is in the range of 3-5 mm. Figure 4 L) shown in is controlled within the range of 3mm to 5mm. For example, the wall thickness of the heat dissipation cavity 113 can be 3mm, 3.2mm, 3.5mm, 4mm, 4.3mm, 5mm, etc., and no specific limitation is made here. Thus, it is possible to better avoid the wall thickness of the heat dissipation cavity 113 being too thin to affect the structural strength of the pole body 111, and at the same time, it is possible to avoid the wall thickness of the heat dissipation cavity 113 being too thick to cause the space of the heat dissipation cavity 113 to be too small to affect the heat dissipation effect of the heat dissipation medium. For example, it is possible to prevent the space for the phase change heat absorption material to be placed too small or the space for the coolant to flow from being too small, so that the heat dissipation effect of the heat dissipation medium on the heat dissipation cavity 113 can be ensured while ensuring the structural strength of the pole body 111.

[0044] In some embodiments, the depth of the heat dissipation cavity 113 is 1-4 mm, and the distance between the inner wall of the heat dissipation cavity 113 and the outer wall of the pole body 111 is 3-5 mm. Thus, the heat dissipation effect of the heat dissipation medium on the heat dissipation cavity 113 can be ensured while ensuring the structural strength of the pole body 111.

[0045] 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 directly connected or indirectly connected 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.

[0046] 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.

[0047] 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, It is characterized in that include: A battery cell, wherein the battery cell has a pole, wherein the pole includes a pole body and a pole seat, wherein the pole body is disposed on the pole seat, wherein the pole body forms a heat dissipation cavity open in a direction away from the pole seat, and wherein a heat dissipation medium is contained in the heat dissipation cavity; A busbar is connected to an end of the pole body which is away from the pole seat.

2. The battery pack according to claim 1, It is characterized in that The heat dissipation medium is a phase-change heat-absorbing material.

3. The battery pack according to claim 1, It is characterized in that A heat dissipation hole is formed on the bus bar and is opposite to the opening of the heat dissipation cavity.

4. The battery pack according to claim 1, It is characterized in that The heat dissipation medium is a heat-conducting material piece, one end of the heat-conducting material piece is located in the heat dissipation cavity, and the other end of the heat-conducting material piece extends to the outside of the heat dissipation cavity.

5. The battery pack according to claim 4, It is characterized in that A heat dissipation hole opposite to the opening of the heat dissipation cavity is formed on the busbar, the heat conductive material piece is passed through the heat dissipation hole and the other end of the heat conductive material piece extends to a side of the busbar away from the pole body.

6. The battery pack according to claim 1, It is characterized in that The battery pack further comprises a water cooling plate, the water cooling plate has a water cooling channel therein, and the heat dissipation cavity is in communication with the water cooling channel.

7. The battery pack according to claim 6, It is characterized in that A plurality of pole bodies are arranged on the pole seat, and a connecting channel connecting the plurality of heat dissipation cavities is formed on the pole seat.

8. The battery pack according to claim 6, It is characterized in that The battery pack further includes a connecting tube, a heat dissipation hole opposite to the opening of the heat dissipation cavity is formed on the bus bar, the connecting tube is passed through the heat dissipation hole and two ends of the connecting tube are respectively connected to the heat dissipation cavity and the water cooling channel.

9. The battery pack according to claim 1, It is characterized in that The battery pack also includes a water cooling plate, and the distance between the pole body and the water cooling plate is less than 10 mm.

10. The battery pack according to claim 1, It is characterized in that The depth of the heat dissipation cavity is in the range of 1-4 mm; and / or the distance between the inner peripheral wall of the heat dissipation cavity and the outer peripheral wall of the pole body is in the range of 3-5 mm.

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