Battery pack

Abstract

The utility model discloses a battery pack which comprises a box body and a plurality of battery cells, wherein a storage space is formed in the box body; the battery cells are arranged in the box body; a plurality of battery cells are arranged in the box body, pressure relief grooves are formed in the bottoms of the battery cells, the pressure relief grooves are connected to form a gas channel, pressure relief valves are arranged in the pressure relief grooves, explosion venting valves are arranged on the surface of the box body, the explosion venting valves are communicated with the gas channel, and gas generated by overheating of the battery cells sequentially penetrates through the pressure relief valves, the gas channel and the explosion venting valves and then flows through the explosion venting valves. The battery pack is separated. The gas channel in the battery pack can be formed without additional production materials, so that the consumption of the production materials is reduced, and the production cost is reduced.

Description

Technical Field

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

[0002] The structure of energy storage batteries and battery packs is related to battery performance, safety and cost. A battery pack refers to a combination of one or more batteries. Currently, the batteries on the market mainly use square batteries and blade batteries. Existing batteries generally adopt a structure in which a pole column and an explosion-proof valve are installed on the upper cover. When thermal runaway occurs, the high-temperature gas generated by the overheated battery cells will pass through the explosion-proof valve and directly impact the pole column, causing the thermal runaway to spread to adjacent battery cells, resulting in the fire and explosion of the battery pack.

[0003] The invention patent with the application number CN202410547293.9 discloses a battery and a heat dissipation method during battery thermal runaway. The battery includes: battery cells; wherein, a plurality of battery cells are arranged in multiple rows side by side; an explosion-proof valve is provided at the bottom of the battery cells; wherein, when the battery cells are overheated, the explosion-proof valve opens, and the ejected substances generated by the battery cells are ejected from the bottom of the battery cells; a bottom case; the bottom case has a sealed exhaust channel; the bottom of the battery cells is embedded in the sealed exhaust channel, and the battery cells are hermetically connected with the sealed exhaust channel; an exhaust valve is located at the exhaust port of the sealed exhaust channel. In this application, through the cooperation of the battery cells and the sealed exhaust channel, when the bottom of the battery cells ejects after thermal runaway, the ejected substances and hot air can be ejected into the sealed exhaust channel, and then discharged out of the battery pack through the sealed exhaust channel. However, in this structure, a sealed exhaust channel is provided on the bottom case, and then the battery cells are embedded in the sealed exhaust channel. The formation of the sealed exhaust channel requires the production of an additional base, and the design of the base increases the consumption of production materials, thereby increasing the production cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery pack, in which the gas channel in the battery pack can be formed without additional production materials, reducing the consumption of production materials and thus reducing the production cost.

[0005] The technical solution adopted by the utility model to solve its technical problems is to propose a battery pack, which includes a box body with a storage space inside, and a plurality of battery cells arranged in the box body; a pressure relief groove is provided at the bottom of the battery cells, and a plurality of the pressure relief grooves are connected to form a gas channel. A pressure relief valve is provided in the pressure relief groove, and a pressure relief explosion valve is provided on the surface of the box body. The pressure relief explosion valve is communicated with the gas channel. After the gas generated by the overheating of the battery cells passes through the pressure relief valve, the gas channel and the pressure relief explosion valve in sequence, it escapes from the battery pack.

[0006] In the embodiment of the present application, the pressure relief groove is provided in the middle of the battery cell.

[0007] In an embodiment of the present application, the battery cell includes a plurality of first battery cells and a plurality of second battery cells. The plurality of first battery cells are arranged side by side in the box body. A first pressure relief groove is provided at the bottom of the plurality of first battery cells, and the plurality of first pressure relief grooves are connected to form a first gas channel. The plurality of second battery cells are arranged side by side in the box body. A second pressure relief groove is provided at the bottom of the plurality of second battery cells, and the plurality of second pressure relief grooves are connected to form a second gas channel.

[0008] In an embodiment of the present application, a heat dissipation gap is provided between the first battery cell and the second battery cell.

[0009] In an embodiment of the present application, a water-cooled plate is provided between the battery cell and the bottom surface of the box body, and the water-cooled plate is used to cool the gas in the gas channel and the battery cell.

[0010] In an embodiment of the present application, the water-cooled plate includes a water inlet, a water outlet, and a cooling channel; one end of the cooling channel is communicated with the water inlet, the other end of the cooling channel is communicated with the water outlet, and the cooling channel is used to provide a flow channel for cold water.

[0011] In an embodiment of the present application, the cooling channel includes a first converging channel, a second converging channel, a first diverging channel, and a second diverging channel; one end of the first diverging channel is communicated with the first converging channel, and the other end is communicated with the second converging channel. One end of the second diverging channel is communicated with the first converging channel, and the other end is communicated with the second converging channel. The first diverging channel is in an S shape and flows through directly below the first gas channel. The first converging channel is communicated with the water inlet, the second diverging channel is communicated with the water outlet, the second diverging channel is in an L shape, and the second diverging channel flows through directly below the second gas channel.

[0012] In an embodiment of the present application, the explosion vent valve is arranged on one side of the box body, and the water inlet and the water outlet are arranged on the side of the box body away from the explosion vent valve.

[0013] In an embodiment of the present application, a terminal groove is provided on the battery cell, and positive and negative terminals are arranged in the terminal groove.

[0014] In an embodiment of the present application, the terminal groove is arranged at the top of the battery cell.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. For a battery pack proposed by the present utility model, the gas channel is formed by connecting the pressure relief grooves provided at the bottom of the battery cells. The explosion vent valve is arranged in the pressure relief groove, and the gas channel can be formed without additional production materials, reducing the consumption of production materials and thus reducing the production cost;

[0017] 2. A battery pack proposed by the present utility model has a water-cooled plate disposed between the battery cell and the bottom surface of the box body. When the battery cell undergoes thermal runaway, the water-cooled plate can exchange heat with the gas in the gas channel to reduce the gas temperature, thereby improving the safety of the battery pack.

[0018] 3. A battery pack proposed by the present utility model has a pole post groove provided on the battery cell, and positive and negative pole posts are arranged in the pole post groove. By arranging the positive and negative pole posts in the pole post groove, the risk of collision between the positive and negative connection posts caused by external impact or vibration can be reduced, thereby enhancing the seismic resistance of the battery cell.

[0019] 4. A battery pack proposed by the present utility model has the positive and negative pole posts arranged on the same side of the battery cell, shortening the current transmission path and reducing the resistance loss, thereby improving the energy efficiency of the battery cell.

[0020] 5. A battery pack proposed by the present utility model has the pole post groove arranged at the top of the battery cell, and the pole post groove and the pressure relief groove are respectively arranged at both ends of the battery cell. When the battery cell undergoes thermal runaway, the gas generated by the overheated battery cell will not contact the pole post, and the thermal runaway will not spread to adjacent battery cells, avoiding the fire and explosion of the battery pack and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present utility model and are used together with the description to explain the principles of the present utility model. In these drawings, like reference numerals are used to represent like elements. The following drawings are some embodiments of the present utility model, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0023] Figure 2 According to an embodiment of the present utility model Figure 1 Cross-sectional view at position A in;

[0024] Figure 3 Rear view of a battery pack according to an embodiment of the present utility model;

[0025] Figure 4 Bottom view of the battery cell of a battery pack according to an embodiment of the present utility model;

[0026] Figure 5 Internal schematic diagram of the water-cooled plate of a battery pack according to an embodiment of the present utility model.

[0027] In the figure: 1. Box body; 2. Battery cell; 21. First battery cell; 22. Second battery cell; 23. Heat dissipation gap; 3. Pressure relief groove; 31. First pressure relief groove; 32. Second pressure relief groove; 4. Gas channel; 41. First gas channel; 42. Second gas channel; 5. Pressure relief valve; 6. Explosion vent valve; 7. Water-cooled plate; 71. Water inlet; 72. Water outlet; 73. Cooling channel; 731. First confluence channel; 732. Second confluence channel; 733. First diversion channel; 734. Second diversion channel; 8. Terminal groove. Specific embodiments

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention and the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can be obtained. Additionally, the terms related to directions only represent the relative positional relationships between components, rather than absolute positional relationships.

[0029] An embodiment of the present invention provides a battery pack. Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , which mainly includes a box body 1, battery cells 2, a pressure relief groove 3, a gas channel 4, a pressure relief valve 5, and an explosion vent valve 6.

[0030] It should be noted that, taking Figure 2 the perspective as a reference benchmark, the bottom in the following text is the Figure 2 lower end, and the top in the following text is the Figure 2 upper end.

[0031] In the embodiment of the present application, the battery pack includes a box body 1 with a storage space inside, multiple battery cells 2 arranged inside the box body 1, a pressure relief groove 3 is arranged at the bottom of the battery cell 2, multiple pressure relief grooves 3 are connected to form a gas channel 4, a pressure relief valve 5 is arranged in the pressure relief groove 3, an explosion vent valve 6 is arranged on the surface of the box body 1, and the explosion vent valve 6 is communicated with the gas channel 4. When a thermal runaway occurs in the battery cell 2, the gas generated by the overheating of the battery cell 2 passes through the pressure relief valve 5, the gas channel 4, and the explosion vent valve 6 in sequence, and then escapes from the battery pack. Compared with the prior art, by arranging a sealed exhaust channel on the bottom case and then embedding the battery cell 2 in the sealed exhaust channel, the formation of the sealed exhaust channel requires the production of an additional base, and the design of the base increases the consumption of production materials, thereby increasing the production cost. In the present application, the gas channel 4 is formed by connecting the pressure relief grooves 3 arranged at the bottom of the battery cell 2, and the pressure relief valve 5 is arranged in the pressure relief groove 3. The gas channel 4 can be formed without additional production materials, reducing the consumption of production materials, thereby reducing the production cost.

[0032] In one implementable manner, the pressure relief groove 3 is arranged in the middle of the battery cell 2.

[0033] In one implementable manner, the battery cell 2 includes a plurality of first battery cells 21 and a plurality of second battery cells 22. The plurality of first battery cells 21 are arranged side by side in the box body 1. A first pressure relief groove 31 is provided at the bottom of the plurality of first battery cells 21. The plurality of first pressure relief grooves 31 are connected to form a first gas channel 41. The plurality of second battery cells 22 are arranged side by side in the box body 1. A second pressure relief groove 32 is provided at the bottom of the plurality of second battery cells 22. The plurality of second pressure relief grooves 32 are connected to form a second gas channel 42.

[0034] Furthermore, a heat dissipation gap 23 is provided between the first battery cell 21 and the second battery cell 22. By arranging the heat dissipation gap 23, the contact area between the first battery cell 21, the second battery cell 22 and the air is increased, thereby improving the heat dissipation efficiency of the first battery cell 21 and the second battery cell 22.

[0035] In one implementable manner, a water cooling plate 7 is provided between the battery cell 2 and the bottom surface of the box body 1. One end of the water cooling plate 7 abuts against the box body 1. The battery cell 2 is fixed in the box body 1 and abuts against the other end of the water cooling plate 7. The water cooling plate 7 exchanges heat with the battery cell 2 to reduce the temperature of the battery cell 2. And because the pressure relief groove 3 is arranged at the bottom of the battery cell 2, the gas channel 4 is also arranged at the bottom of the battery cell 2. When the battery cell 2 has a thermal runaway, the water cooling plate 7 can exchange heat with the gas in the gas channel 4 to reduce the gas temperature, thereby improving the safety of the battery pack.

[0036] Furthermore, the water cooling plate 7 includes a water inlet 71, a water outlet 72, and a cooling channel 73. The water inlet 71 penetrates through the box body 1 and extends to the outer space of the box body 1. The water outlet 72 penetrates through the box body 1 and extends to the outer space of the box body 1. One end of the cooling channel 73 is communicated with the water inlet 71, and the other end is communicated with the water outlet 72. The water inlet 71 is communicated with a water inlet pipe to convey cold water to the cooling channel 73. The water outlet 72 is used to discharge the cold water in the cooling channel 73. When the cold water flows through the cooling channel 73, the cold water in the cooling channel 73 exchanges heat with the battery cell 2, thereby reducing the temperature of the gas generated in the gas channel 4 due to the overheating of the battery cell 2 and reducing the temperature of the battery cell 2.

[0037] Specifically, the cooling channel 73 includes a first confluence channel 731, a second confluence channel 732, a first diversion channel 733, and a second diversion channel 734. One end of the first diversion channel 733 is connected to the first confluence channel 731, and the other end is connected to the second confluence channel 732. One end of the second diversion channel 734 is connected to the first confluence channel 731, and the other end is connected to the second confluence channel 732. The first confluence channel 731 is connected to the water inlet 71, and the second diversion channel 734 is connected to the water outlet 72. The first diversion channel 733 is in an S shape, and the second diversion channel 734 is in an L shape. The first diversion channel 733 flows through directly below the first gas channel 41, and the second diversion channel 734 flows through directly below the second gas channel 42. Two diversion channels with different structures are provided. Among them, the S-shaped first diversion channel 733 occupies a larger area, thereby improving the cooling effect of the water-cooled plate 7, and the cold water at the water inlet 71 can quickly flow through below the two gas channels, avoiding the reduction of the cooling effect of the water-cooled plate 7 on the two gas channels caused by the warming of the cold water during the flow process.

[0038] It can be foreseen that when the battery cell 2 near the explosion relief valve 6 undergoes thermal runaway, the generated gas can quickly pass through the explosion relief valve 6 and thus escape from the battery pack. However, when the battery cell 2 far from the explosion relief valve 6 undergoes thermal runaway, the generated gas needs to pass through a gas channel 4 for a period of time before passing through the explosion relief valve 6. At this time, the generated gas will remain in the battery pack for a period of time, and the high-temperature gas remaining in the battery pack may cause an accident. To improve the safety of the battery pack, the explosion relief valve 6 is arranged on one side of the box body 1, and the water inlet 71 and the water outlet 72 are arranged on the side of the box body 1 far from the explosion relief valve 6, so that the cooling efficiency of the battery cell 2 far from the explosion relief valve 6 is improved. When the battery cell 2 far from the explosion relief valve 6 undergoes thermal runaway, the gas generated by the thermal runaway is cooled, thereby improving the safety of the battery pack.

[0039] In an implementable manner, a terminal post groove 8 is provided on the battery cell 2, and positive and negative terminal posts are arranged in the terminal post groove 8. By arranging the positive and negative terminal posts in the terminal post groove 8, the risk of the positive and negative connection posts colliding with each other due to external impact or vibration can be reduced, thereby enhancing the seismic resistance of the battery cell 2. Moreover, the positive and negative terminal posts are arranged on the same side of the battery cell 2, shortening the current transmission path and reducing the resistance loss, thereby improving the energy efficiency of the battery cell 2.

[0040] Furthermore, the terminal post groove 8 is arranged at the top of the battery cell 2, and the terminal post groove 8 and the pressure relief groove 3 are respectively arranged at both ends of the battery cell 2. When the battery cell 2 undergoes thermal runaway, the gas generated by the overheating of the battery cell 2 will not contact the terminal posts, and the thermal runaway will not spread to adjacent battery cells 2, avoiding the fire and explosion of the battery pack and improving the safety of the battery pack.

[0041] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0042] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments, and it cannot be determined that the specific embodiments of the present utility model are only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, It includes a box body (1) with a storage space inside, and a plurality of battery cells (2) arranged in the box body (1); a pressure relief groove (3) is provided at the bottom of the battery cell (2), and a plurality of the pressure relief grooves (3) are connected to form a gas channel (4). A pressure relief valve (5) is provided in the pressure relief groove (3), and a pressure relief valve (6) is provided on the surface of the box body (1). The pressure relief valve (6) is communicated with the gas channel (4). The gas generated by the overheating of the battery cell (2) passes through the pressure relief valve (5), the gas channel (4) and the pressure relief valve (6) in sequence and then escapes from the battery pack.

2. The battery pack according to claim 1, wherein The pressure relief groove (3) is arranged in the middle of the battery cell (2).

3. The battery pack according to claim 1, characterized in that, The battery cell (2) includes a plurality of first battery cells (21) and a plurality of second battery cells (22). A plurality of the first battery cells (21) are arranged side by side in the box body (1). A first pressure relief groove (31) is provided at the bottom of the plurality of first battery cells (21). A plurality of the first pressure relief grooves (31) are connected to form a first gas channel (41). A plurality of the second battery cells (22) are arranged side by side in the box body (1). A second pressure relief groove (32) is provided at the bottom of the plurality of second battery cells (22). A plurality of the second pressure relief grooves (32) are connected to form a second gas channel (42).

4. A battery pack according to claim 3, characterized in that, A heat dissipation gap (23) is provided between the first battery cell (21) and the second battery cell (22).

5. A battery pack according to claim 3, wherein, A water cooling plate (7) is provided between the battery cell (2) and the bottom surface of the box body (1). The water cooling plate (7) is used to cool the gas in the gas channel (4) and the battery cell (2).

6. A battery pack according to claim 5, wherein The water cooling plate (7) includes a water inlet (71), a water outlet (72), and a cooling channel (73); one end of the cooling channel (73) is communicated with the water inlet (71), the other end of the cooling channel (73) is communicated with the water outlet (72), and the cooling channel (73) is used to provide a flowing channel for cold water.

7. A battery pack according to claim 6, characterized in that The cooling channel (73) includes a first confluence channel (731), a second confluence channel (732), a first diversion channel (733), and a second diversion channel (734); one end of the first diversion channel (733) is communicated with the first confluence channel (731), and the other end is communicated with the second confluence channel (732). One end of the second diversion channel (734) is communicated with the first confluence channel (731), and the other end is communicated with the second confluence channel (732). The first diversion channel (733) is in an S shape and flows through directly below the first gas channel (41). The first confluence channel (731) is communicated with the water inlet (71), the second diversion channel (734) is communicated with the water outlet (72), the second diversion channel (734) is in an L shape, and the second diversion channel (734) flows through directly below the second gas channel (42).

8. A battery pack according to claim 6, characterized in that, The pressure relief valve (6) is arranged on one side of the box body (1), and the water inlet (71) and the water outlet (72) are arranged on the side of the box body (1) away from the pressure relief valve (6).

9. A battery pack according to claim 1, wherein, The battery cell (2) is provided with pole column grooves (8), and positive and negative pole columns are arranged in the pole column grooves (8).

10. A battery pack according to claim 9, wherein, The pole column grooves (8) are arranged at the top of the battery cell (2).

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