Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack, which belong to the technical field of battery packs and comprise a shell and a battery cell body. The shell is provided with an accommodating cavity; a liquid inlet and a liquid outlet are formed in the shell; the battery cell body is arranged in the accommodating cavity; a gap exists between the outer wall of the battery cell body and the cavity wall of the accommodating cavity to form a cooling liquid flow channel, the cooling liquid flow channel is distributed around the peripheral surface of the battery cell body, the cooling liquid flow channel is respectively communicated with the liquid inlet and the liquid outlet, and the cooling liquid flow channel is used for circulating cooling liquid. According to the single battery provided by the utility model, the battery cell body is arranged in the accommodating cavity of the shell, the cooling liquid flow channels are formed between the battery cell body and the cavity wall of the accommodating cavity and are used for circulating the cooling liquid, and the cooling liquid flow channels are distributed around the peripheral surface of the battery cell body, so that the cooling area of the battery cell body is increased; the heat dissipation performance of the battery cell body is improved, so that the potential safety hazard caused by overhigh temperature of the battery cell body is eliminated.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and more specifically, relates to a single battery and a battery pack. Background Art

[0002] Currently, the charge rate for fast-charging batteries is around 2C. Cooling of the battery cells is primarily single-sided, particularly for prismatic cells, which typically cool on the bottom side because their tabs face upward and copper bars are located between them. However, at higher charging rates, heat generation increases exponentially, and traditional bottom-side cooling is no longer sufficient. Excessively high battery temperatures can affect performance and potentially cause problems such as bulging, significantly shortening the battery life. In severe cases, they can also lead to fire or even explosion, posing a safety hazard. Utility Model Content

[0003] The purpose of the present invention is to provide a single cell and a battery pack, aiming to solve the technical problem in the prior art that the cooling of the bottom surface of the battery cell can no longer meet the heat dissipation requirements, resulting in excessive temperature and potential safety hazards.

[0004] In a first aspect, an embodiment of the present invention provides a single battery, comprising:

[0005] The shell has a receiving cavity; the shell is provided with a liquid inlet and a liquid outlet; and

[0006] The battery cell body is placed in the accommodating cavity; there is a gap between the outer wall of the battery cell body and the cavity wall of the accommodating cavity to form a cooling liquid flow channel, and the cooling liquid flow channel is distributed around the outer peripheral surface of the battery cell body; the cooling liquid flow channel is respectively connected to the liquid inlet and the liquid outlet, and the cooling liquid flow channel is used to circulate the cooling liquid.

[0007] In a possible implementation, a limiting portion is provided in the cooling liquid flow channel, the limiting portion is squeezed between the outer wall of the battery cell body and the cavity wall of the accommodating cavity, and the limiting portion is used to limit the movement of the battery cell body in the accommodating cavity.

[0008] In some embodiments, the limiting portion is fixed on the cavity wall of the accommodating cavity and abuts against the outer wall of the battery cell body.

[0009] In some embodiments, the limiting portion includes a plurality of protrusions distributed at intervals.

[0010] In a possible implementation, the shell is made of insulating material.

[0011] In a possible implementation, the coolant flowing in the coolant flow channel includes at least one of silicone oil, mineral oil, electronic fluorinated liquid, or decafluoropentane coolant.

[0012] The beneficial effect of the single cell battery provided by the present invention is that, compared with the prior art, the single cell battery of the present invention places the battery cell body in the accommodating cavity of the shell, and forms a cooling liquid flow channel between the battery cell body and the cavity wall of the accommodating cavity for circulating the cooling liquid. Since the cooling liquid flow channel is distributed around the outer peripheral surface of the battery cell body, the cooling area of the battery cell body is increased, and the heat dissipation performance of the battery cell body is improved, thereby eliminating the safety hazard caused by the battery cell body's own temperature being too high.

[0013] In a second aspect, an embodiment of the present invention provides a battery pack comprising a plurality of the above-mentioned single cells.

[0014] In a second aspect, in a possible implementation, the battery pack further includes:

[0015] a liquid inlet manifold connected to the liquid inlets of the plurality of single cells; and

[0016] The liquid outlet main pipe is connected to the liquid outlets of the plurality of single cells.

[0017] In some embodiments, each of the liquid inlets is provided with a liquid inlet branch pipe extending outward;

[0018] The liquid inlet main pipe includes a first main pipe and a plurality of first branch pipes respectively connected to the first main pipe, and the plurality of first branch pipes are plugged into the plurality of liquid inlet branch pipes in a one-to-one correspondence.

[0019] In some embodiments, each of the liquid outlets is provided with a liquid outlet branch pipe extending outward;

[0020] The liquid outlet main pipe includes a second main pipe and a plurality of second branch pipes respectively connected to the second main pipe, and the plurality of second branch pipes are plugged into the plurality of liquid outlet branch pipes in a one-to-one correspondence.

[0021] The battery pack provided by the present invention, by adopting the above-mentioned single battery, can improve the heat dissipation effect of the battery core body, avoid the single battery and the battery pack from being overheated, and eliminate safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a single cell provided in an embodiment of the present utility model;

[0024] Figure 2 A schematic cross-sectional view of a single cell provided in an embodiment of the present utility model;

[0025] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at the middle circle A;

[0026] Figure 4 A schematic structural diagram of a battery pack provided in an embodiment of the present utility model.

[0027] In the picture:

[0028] 1. Shell; 11. Liquid inlet; 12. Liquid outlet; 13. Liquid inlet branch pipe; 14. Liquid outlet branch pipe;

[0029] 2. Battery cell body;

[0030] 3. Coolant flow channel;

[0031] 4. Limiting part;

[0032] 5. Liquid inlet main pipe; 51. First main pipe; 52. First branch pipe;

[0033] 6. Liquid outlet main pipe; 61. Second main pipe; 62. Second branch pipe. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] Please also refer to Figure 1 and Figure 2 The single cell battery provided by the present invention will now be described. The single cell battery comprises a housing 1 and a cell body 2. The housing 1 has a receiving cavity; a liquid inlet 11 and a liquid outlet 12 are provided on the housing 1; the cell body 2 is disposed within the receiving cavity; a gap is formed between the outer wall of the cell body 2 and the wall of the receiving cavity to form a coolant flow channel 3. The coolant flow channel 3 surrounds the outer circumference of the cell body 2 and is connected to the liquid inlet 11 and the liquid outlet 12, respectively, for circulating the coolant.

[0036] Preferably, the structure of the shell 1 is adapted to the structure of the cell body 2 and is a thin-walled shell structure. The accommodating cavity is a sealed cavity, and the shell 1 is used to wrap the cell body 2 so that the cell body 2 is in a sealed space.

[0037] The liquid inlet 11 and the liquid outlet 12 are arranged on the same side wall of the shell 1. Although the liquid inlet 11 and the liquid outlet 12 are both connected to the coolant flow channel 3, the liquid inlet 11 and the liquid outlet 12 are both connected to pipes, and the liquid inlet 11 and the liquid outlet 12 are sealed by the pipes to achieve complete closure of the accommodating cavity.

[0038] A positive electrode column and a negative electrode column are further provided on one side wall of the housing 1, and the positive electrode column and the negative electrode column are respectively insulated and connected to the side wall of the housing 1. Specifically, the housing 1 can be made of an insulating material to directly achieve an insulating connection, or an insulating structure can be provided on the side wall of the housing 1, and the positive electrode column and the negative electrode column are connected to the insulating structure.

[0039] The battery cell body 2 is placed in the accommodating cavity. The battery cell body 2 is connected to a positive electrode ear and a negative electrode ear. The positive electrode ear is connected to the positive electrode post, and the negative electrode ear is connected to the negative electrode post to realize the electrical connection between the power-consuming device or the busbar and the connecting device and the single battery, thereby realizing the discharge or charging of the single battery.

[0040] Coolant channels 3 surround the outer surface of the cell body 2. Coolant enters the channels 3 through the inlet 11 and exits through the outlet 12. The coolant can circulate within the channels 3, entering through the inlet 11, flowing through the channels 3, and exiting through the outlet 12. Alternatively, the coolant can fill the channels 3 and then be discharged through the outlet 12 after a predetermined cooling period.

[0041] The battery cell body 2 is immersed in the coolant, which can be understood as being partially immersed in the coolant or completely immersed in the coolant. The liquid cooling method can make the contact area between the coolant and the battery cell body 2 more uniform, thereby evenly dissipating heat from the battery cell body 2 and improving the heat dissipation effect.

[0042] It should be noted that the coolant must be insulating, non-flammable and inert to meet the heat dissipation requirements.

[0043] Compared with the prior art, the single battery provided by the present invention places the battery cell body 2 in the accommodating cavity of the shell 1, and forms a coolant flow channel 3 between the battery cell body 2 and the cavity wall of the accommodating cavity for circulating the coolant. Since the coolant flow channel 3 is distributed around the outer peripheral surface of the battery cell body 2, the cooling area of the battery cell body 2 is increased, and the heat dissipation performance of the battery cell body 2 is improved, thereby eliminating the safety hazard caused by the battery cell body 2 itself being overheated.

[0044] The cell body 2 is connected to the positive electrode post through the positive tab and to the negative electrode post through the negative tab, and the cell body 2 is immersed in the coolant. Due to the high fluidity of the liquid, in order to prevent the cell body 2 from colliding with the cavity wall due to inertia when the single battery is suddenly moved by external force, in some embodiments, the shell 1 and the cell body 2 can also be connected by the following method: Figure 2 and Figure 3 The structure shown, see Figure 2 and Figure 3 A limiting portion 4 is provided in the cooling liquid flow channel 3. The limiting portion 4 is squeezed between the outer wall of the battery cell body 2 and the cavity wall of the accommodating cavity. The limiting portion 4 is used to limit the movement of the battery cell body 2 in the accommodating cavity.

[0045] The limiting portion 4 is squeezed between the cell body 2 and the wall of the accommodating cavity, forming an interference fit with the cell body 2, so that the cell body 2 is retained between the limiting portions 4. When the single battery is suddenly moved by external force, the cell body 2 directly presses against the limiting portion 4 due to inertia. The limiting portion 4 isolates the cell body 2 from the housing 1, thereby preventing collision between the cell body 2 and the housing 1.

[0046] It should be noted that the limiting portion 4 is also distributed around the outer circumference of the battery cell body 2 , but the limiting portion 4 cannot block the coolant flow channel 3 and cannot prevent the normal flow of the coolant.

[0047] Preferably, based on the above embodiment, the limiting portion 4 is fixed to the cavity wall of the accommodating cavity and abuts against the outer wall of the battery cell body 2. The limiting portion 4 is fixed to the cavity wall of the accommodating cavity and cannot move, so as to ensure that the battery cell body 2 can be squeezed and limited by the limiting portion 4 when assembling the battery cell body 2, thereby simplifying the assembly method.

[0048] The limiting portion 4 can be regarded as a part of the housing 1 and is formed integrally with the housing 1 to simplify the connection method of the limiting portion 4 and improve the strength of the limiting portion 4 itself.

[0049] See also Figure 4 On the basis of the above embodiment, the limiting portion 4 includes a plurality of protrusions distributed at intervals.

[0050] Multiple protrusions are spaced apart on the walls of the accommodating cavity. If the cell body 2 is a rectangular parallelepiped, the multiple protrusions are distributed on the left, right, front, rear, and bottom walls of the accommodating cavity. If the cell body 2 is a cylindrical structure, the multiple protrusions are distributed on the radial and bottom walls of the accommodating cavity.

[0051] The outward protruding width of the protrusion is slightly larger than the width of the coolant flow channel 3 to ensure that an interference fit can be formed with the battery cell body 2 .

[0052] The protrusion may be in the shape of an elongated strip or a hemispherical shape. This embodiment does not specifically limit the structure of the protrusion. Preferably, the protrusion and the battery cell body 2 can form surface contact after abutting, and the two are in elastic abutment.

[0053] In some embodiments, the housing 1 is made of an insulating material. The insulating material can effectively improve the sealing performance of the single battery and prevent the housing 1 from being electrically connected to the battery body 2 and causing a short circuit in the battery body 2.

[0054] In some embodiments, the coolant flowing through the coolant channel 3 is an insulating coolant. The insulating coolant is inert and non-flammable, which helps meet heat dissipation requirements. In this embodiment of the present application, the coolant is made of at least one of silicone oil, mineral oil, electronic fluorinated liquid, or decafluoropentane coolant.

[0055] See also Figure 4 Based on the same inventive concept, an embodiment of the present application further provides a battery pack comprising a plurality of the above-mentioned single cells. The plurality of single cells are closely arranged in an array.

[0056] The battery pack provided by the present invention, by adopting the above-mentioned single battery, can improve the heat dissipation effect of the battery core body 2, avoid the single battery and the battery pack from being overheated, and eliminate safety hazards.

[0057] In some embodiments, the battery pack may also be used as follows Figure 4 The structure shown, see Figure 4 The battery pack further includes a liquid inlet manifold 5 and a liquid outlet manifold 6. The liquid inlet manifold 5 is connected to the liquid inlets 11 of the plurality of single cells; the liquid outlet manifold 6 is connected to the liquid outlets 12 of the plurality of single cells.

[0058] The liquid inlet manifold 5 is used to supply coolant to the multiple single cells, and the liquid outlet manifold 6 is used to return the coolant in the multiple single cells. It should be noted that the liquid inlet manifold 5 or the liquid outlet manifold 6 is connected to a pressure pump for pumping the coolant.

[0059] In addition, the liquid inlet manifold 5 also serves to seal the liquid inlet 11 , and the liquid outlet manifold 6 serves to seal the liquid outlet 12 .

[0060] Preferably, each liquid inlet 11 is provided with a liquid inlet branch pipe 13 extending outward, and the liquid inlet main pipe 5 includes a first main pipe 51 and multiple first branch pipes 52 respectively connected to the first main pipe 51, and the multiple first branch pipes 52 are plugged into the multiple liquid inlet branch pipes 13 one by one.

[0061] The liquid inlet branch pipe 13 extends outward from the housing 1 and has a retaining ring on its outer wall. Multiple first branch pipes 52 are integrally formed with the first main pipe 51, and retaining grooves are provided on the inner walls of the first branch pipes 52. During assembly, the multiple first branch pipes 52 are aligned with the multiple liquid inlet branch pipes 13. Since the liquid inlet branch pipes 13 extend outward, the first branch pipes 52 can be easily nested in the liquid inlet branch pipes 13. Once the retaining rings are inserted into the retaining grooves, assembly is complete.

[0062] Correspondingly, each liquid outlet 12 is provided with a liquid outlet branch pipe 14 extending outward. The liquid outlet main pipe 6 includes a second main pipe 61 and multiple second branch pipes 62 respectively connected to the second main pipe 61. The multiple second branch pipes 62 are plugged into the multiple liquid outlet branch pipes 14 one by one.

[0063] The liquid outlet branch pipe 14 extends outward from the housing 1 and is also provided with a retaining ring on its outer wall. Multiple second branch pipes 62 are integrally formed with the second main pipe 61, and retaining grooves are also provided on the inner walls of the second branch pipes 62. During assembly, the multiple second branch pipes 62 are aligned with the multiple liquid outlet branch pipes 14. Since the liquid outlet branch pipes 14 extend outward, the second branch pipes 62 can be easily nested in the liquid outlet branch pipes 14. After the retaining rings are inserted into the retaining grooves, assembly is complete.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single battery, characterized in that: include: A housing (1) having a receiving cavity; the housing (1) is provided with a liquid inlet (11) and a liquid outlet (12); and A battery cell body (2) is placed in the accommodating cavity; a gap exists between the outer wall of the battery cell body (2) and the cavity wall of the accommodating cavity to form a cooling liquid flow channel (3), and the cooling liquid flow channel (3) is distributed around the outer peripheral surface of the battery cell body (2); the cooling liquid flow channel (3) is respectively connected to the liquid inlet (11) and the liquid outlet (12), and the cooling liquid flow channel (3) is used to circulate cooling liquid.

2. The single cell according to claim 1, wherein: A limiting portion (4) is provided in the cooling liquid flow channel (3), and the limiting portion (4) is squeezed between the outer wall of the battery cell body (2) and the cavity wall of the accommodating cavity. The limiting portion (4) is used to limit the movement of the battery cell body (2) in the accommodating cavity.

3. The single cell according to claim 2, wherein: The limiting portion (4) is fixed on the cavity wall of the accommodating cavity and abuts against the outer wall of the battery cell body (2).

4. The single cell according to claim 3, wherein: The limiting portion (4) comprises a plurality of protrusions distributed at intervals.

5. The single cell according to claim 1, wherein: The shell (1) is made of insulating material.

6. The single cell according to claim 1, wherein: The coolant flowing in the coolant flow channel (3) includes at least one of silicone oil, mineral oil, electronic fluorinated liquid or decafluoropentane coolant.

7. A battery pack, characterized in that: The invention comprises a plurality of single cells according to any one of claims 1 to 6.

8. The battery pack according to claim 7, wherein: The battery pack further includes: a liquid inlet manifold (5) connected to the liquid inlets (11) of the plurality of single cells; and The liquid outlet main pipe (6) is connected to the liquid outlets (12) of the plurality of single cells.

9. The battery pack according to claim 8, wherein: Each of the liquid inlets (11) is provided with a liquid inlet branch pipe (13) extending outward; The liquid inlet main pipe (5) comprises a first main pipe (51) and a plurality of first branch pipes (52) respectively connected to the first main pipe (51). The plurality of first branch pipes (52) are plugged into the plurality of liquid inlet branch pipes (13) in a one-to-one corresponding manner.

10. The battery pack according to claim 8, wherein: Each of the liquid outlets (12) is provided with a liquid outlet branch pipe (14) extending outward; The liquid outlet main pipe (6) comprises a second main pipe (61) and a plurality of second branch pipes (62) respectively connected to the second main pipe (61). The plurality of second branch pipes (62) are plugged into the plurality of liquid outlet branch pipes (14) in a one-to-one correspondence.

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