Single battery and electric equipment

Abstract

The utility model belongs to the field of cooling of soft package secondary batteries, and particularly relates to a single battery and electric equipment. In order to solve the technical problem that in the prior art, cooling liquid needs to exchange heat with a single battery through an outer protective film, the heat conductivity of the outer protective film is poorer, and the heat dissipation performance of the single battery is poorer, the utility model provides a single battery which comprises an outer protective film, a battery cell, electrolyte and a liquid cooling plate in direct contact with the electrolyte, the liquid cooling plate comprises a liquid inlet part and a liquid outlet part of which one ends extend out of the outer protective film, and the liquid inlet part and the liquid outlet part are hermetically connected with the outer protective film; and the liquid cooling plate is made of a heat-conducting insulating material, or a heat-conducting insulating layer is arranged on the outer surface of the liquid cooling plate. The utility model further provides electric equipment comprising the single battery. And the liquid cooling plate is directly soaked in the electrolyte, so that the liquid cooling plate and the electrolyte can be directly subjected to heat exchange, and the heat dissipation capability of the single battery is improved.

Description

Technical Field

[0001] The utility model belongs to the field of cooling of soft-pack secondary batteries, in particular to a single battery and electrical equipment. Background Art

[0002] A single cell battery generates a lot of heat when working. When the temperature of the single cell battery is high, thermal runaway will occur. Therefore, the single cell battery needs to be cooled when it is working normally.

[0003] A Chinese utility model patent with authorization announcement number CN217848088U and authorization announcement date 2022.11.18 discloses a water-cooled built-in soft-pack battery, including a soft-pack battery core, a hollow area is formed inside the soft-pack battery core, and an aluminum-plastic film (i.e., an outer protective film) is encapsulated on the inner and outer roll surfaces of the soft-pack battery core. A built-in bracket is arranged in the hollow area, and the built-in bracket is sealed with the aluminum-plastic film on the inner roll surface of the core to form a closed space, and the inner bracket is provided with a water inlet and a water outlet connecting the outside and the closed space.

[0004] When cooling the soft-pack battery, the coolant is allowed to flow in from the water inlet and out from the water outlet. However, due to the poor thermal conductivity of the aluminum-plastic film, the heat exchange between the coolant in the enclosed space and the soft-pack battery is slow, resulting in poor heat dissipation performance of the soft-pack battery. Utility Model Content

[0005] The purpose of the utility model is to provide a single battery to solve the technical problem that the cooling liquid in the prior art needs to pass through the outer protective film to exchange heat with the soft-pack battery, and the thermal conductivity of the outer protective film is poor, resulting in poor heat dissipation performance of the soft-pack battery. The purpose of the utility model is also to provide an electrical device to solve the same technical problem as above.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the single cell provided by the utility model is:

[0007] A single cell battery comprises an outer protective film, a battery cell encapsulated in the outer protective film and an electrolyte filled in the outer protective film, and also comprises a liquid cooling plate in direct contact with the electrolyte, the liquid cooling plate comprising a liquid inlet and a liquid outlet with one end extending out of the outer protective film, the liquid inlet and the liquid outlet being sealedly connected to the outer protective film; the liquid cooling plate is made of a heat-conducting insulating material, or a heat-conducting insulating layer is provided on the outer surface of the liquid cooling plate.

[0008] Furthermore, the battery cell is stacked, and the battery cell includes a pole piece and a diaphragm, a receiving gap is formed between the pole piece and the adjacent diaphragm, and the liquid cooling plate is arranged in at least one of the receiving gaps.

[0009] Furthermore, the liquid cooling plate is located in a receiving gap formed between the negative electrode plate of the battery cell and the diaphragm on the side of the corresponding negative electrode plate facing away from the positive electrode plate.

[0010] Furthermore, an insulating hot melt adhesive layer is provided on the liquid inlet and the liquid outlet.

[0011] Furthermore, an insulating hot-melt adhesive layer is also provided on the portion of the outer protective film that is connected to the liquid inlet and the liquid outlet.

[0012] Furthermore, the liquid inlet and the liquid outlet of the liquid cooling plate are both located on the side of the single cell where the tab is not located.

[0013] Furthermore, the liquid inlet and the liquid outlet of the liquid cooling plate are located on the same side of the liquid cooling plate.

[0014] Furthermore, the portion of the liquid inlet and / or the liquid outlet of the liquid cooling plate extending out of the outer protective film is bent upward.

[0015] Furthermore, the liquid cooling plate protrudes outward to form a protruding portion, and the interior of the protruding portion is hollowed out to form a flow channel with two ends respectively connected to the liquid inlet portion and the liquid outlet portion.

[0016] The beneficial effects of the single cell battery of the utility model are as follows: the utility model is an improved invention. The outer protective film can protect the battery core and electrolyte inside the outer protective film, so that the single cell can be charged and discharged normally; the liquid cooling plate is directly in contact with the electrolyte, so that the liquid cooling plate and the pole piece can directly exchange heat, thereby improving the heat dissipation capacity of the single cell battery. At the same time, the liquid cooling plate and the electrolyte are insulated, thereby avoiding the liquid cooling plate from participating in the charging and discharging; the liquid inlet and the liquid outlet are sealed and connected with the outer protective film, so that the sealing of the single cell battery can be ensured. At the same time, the coolant can be injected into the liquid inlet from the outside of the single cell battery, and the coolant can flow out from the liquid outlet, so that the coolant inside the single cell battery can be continuously replaced, thereby ensuring the heat dissipation effect of the single cell battery.

[0017] In order to achieve the above-mentioned purpose, the technical solution of the electrical equipment provided by the utility model is:

[0018] An electrical device comprises a single cell, wherein the single cell comprises an outer protective film, a battery cell encapsulated in the outer protective film and an electrolyte filled in the outer protective film, and further comprises a liquid cooling plate in direct contact with the electrolyte, wherein the liquid cooling plate comprises a liquid inlet and a liquid outlet, one end of which extends out of the outer protective film, and the liquid inlet and the liquid outlet are sealedly connected to the outer protective film; the liquid cooling plate is made of a heat-conducting insulating material, or a heat-conducting insulating layer is provided on the outer surface of the liquid cooling plate.

[0019] Furthermore, the battery cell is stacked, and the battery cell includes a pole piece and a diaphragm, a receiving gap is formed between the pole piece and the adjacent diaphragm, and the liquid cooling plate is arranged in at least one of the receiving gaps.

[0020] Furthermore, the liquid cooling plate is located in a receiving gap formed between the negative electrode plate of the battery cell and the diaphragm on the side of the corresponding negative electrode plate facing away from the positive electrode plate.

[0021] Furthermore, an insulating hot melt adhesive layer is provided on the liquid inlet and the liquid outlet.

[0022] Furthermore, an insulating hot-melt adhesive layer is also provided on the portion of the outer protective film that is connected to the liquid inlet and the liquid outlet.

[0023] Furthermore, the liquid inlet and the liquid outlet of the liquid cooling plate are both located on the side of the single cell where the tab is not located.

[0024] Furthermore, the liquid inlet and the liquid outlet of the liquid cooling plate are located on the same side of the liquid cooling plate.

[0025] Furthermore, the portion of the liquid inlet and / or the liquid outlet of the liquid cooling plate extending out of the outer protective film is bent upward.

[0026] Furthermore, the liquid cooling plate protrudes outward to form a protruding portion, and the interior of the protruding portion is hollowed out to form a flow channel with two ends respectively connected to the liquid inlet portion and the liquid outlet portion.

[0027] The beneficial effects of the single cell battery of the utility model are as follows: the utility model is an improved invention. The outer protective film can protect the battery core and electrolyte inside the outer protective film, so that the single cell can normally supply power to the electrical equipment; the liquid cooling plate is in direct contact with the electrolyte, so that the liquid cooling plate and the pole piece can directly exchange heat, thereby improving the heat dissipation capacity of the single cell battery. At the same time, the liquid cooling plate and the electrolyte are insulated, thereby preventing the liquid cooling plate from participating in charging and discharging; the liquid inlet and the liquid outlet are sealed and connected with the outer protective film, thereby ensuring the sealing of the single cell battery. At the same time, the coolant can be injected into the liquid inlet from the outside of the single cell battery, and the coolant can flow out from the liquid outlet, thereby continuously replacing the coolant inside the single cell battery, thereby ensuring the heat dissipation effect of the single cell battery and the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a first liquid cooling plate for a single cell in the utility model;

[0029] Figure 2 This is a schematic structural diagram of a second liquid cooling plate for a single cell in the utility model;

[0030] Figure 3 This is a schematic structural diagram of a third liquid cooling plate for a single cell in the utility model;

[0031] Figure 4 It is a schematic structural diagram of a fourth liquid cooling plate of a single cell in the utility model;

[0032] Figure 5It is a schematic diagram of the structure of the battery cell of the single battery in the utility model;

[0033] Figure 6 for Figure 5 Exploded diagram of the structure;

[0034] Figure 7 for Figure 5 A cross-sectional view of

[0035] Figure 8 It is an enlarged structural diagram of the sealing connection between the outer protective film of the single cell and the liquid cooling plate in the utility model;

[0036] Fig. 9 It is a schematic structural diagram of the flow channel of the fifth liquid cooling plate of the single cell in the utility model;

[0037] Fig.10 It is a schematic structural diagram of the flow channel of the sixth liquid cooling plate of the single cell in the utility model.

[0038] Description of reference numerals:

[0039] 1. Liquid cooling plate; 11. Liquid inlet; 12. Liquid outlet; 13. Bending part; 14. Flow channel; 2. Battery cell; 21. Positive electrode tab; 22. Negative electrode tab; 23. Diaphragm; 24. Positive electrode sheet; 25. Negative electrode sheet; 3. Outer protective film; 4. Insulating hot melt adhesive layer; 4', insulating hot melt adhesive layer. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the embodiments.

[0041] The specific embodiment of the single battery provided by the utility model is as follows:

[0042] The purpose of this embodiment is to provide a single cell battery, which improves the heat dissipation capacity of the single cell battery by immersing a liquid cooling plate connected to the outside in the electrolyte of the single cell battery.

[0043] As a specific implementation method, Figure 1-8As shown, the single cell includes an outer protective film 3, a battery cell 2 encapsulated in the outer protective film 3, and an electrolyte filled in the outer protective film 3. The single cell also includes a liquid cooling plate 1 in direct contact with the electrolyte. The liquid cooling plate 1 includes a liquid inlet 11 and a liquid outlet 12 extending out of the outer protective film 3 at one end, and the liquid inlet 11 and the liquid outlet 12 are sealed and connected to the outer protective film 3. The liquid cooling plate 1 is made of a heat-conducting insulating material, or a heat-conducting insulating layer is provided on the outer surface of the liquid cooling plate 1. Among them, the outer protective film 3 is an aluminum-plastic film or other protective films with the same properties as the aluminum-plastic film commonly used in the art. Specifically, the outer protective film 3 is a prior art and will not be described here. The liquid cooling plate 1 is made of a heat-conducting insulating material, or the liquid cooling plate 1 includes a plate body made of a heat-conducting metal material and a heat-conducting insulating layer provided on the outer surface of the plate body, so as to ensure the insulation between the liquid cooling plate 1 and the electrolyte. Specifically, the heat-conducting insulating material and the heat-conducting metal material are both materials in the prior art.

[0044] The outer protective film 3 can protect the battery core 2 and the electrolyte inside the outer protective film 3, so that the single battery can be charged and discharged normally; the liquid cooling plate 1 is directly immersed in the electrolyte, so that the liquid cooling plate 1 and the electrolyte can directly exchange heat, thereby improving the heat dissipation capacity of the single battery. At the same time, the liquid cooling plate 1 is insulated from the electrolyte, thereby preventing the liquid cooling plate 1 from participating in charging and discharging; the liquid inlet 11 and the liquid outlet 12 are sealed and connected to the outer protective film 3 by insulating hot melt adhesive, thereby ensuring the sealing of the single battery. At the same time, coolant can be injected into the liquid inlet 11 from the outside of the single battery, and the coolant can flow out from the liquid outlet 12, thereby continuously replacing the coolant inside the single battery, thereby ensuring the heat dissipation effect of the single battery.

[0045] Specifically, Figure 5-7 As shown, the outer protective film 3 encapsulates a laminated battery cell 2, the battery cell 2 includes a pole piece and a diaphragm 23, a receiving gap is formed between the pole piece and the adjacent diaphragm 23, and the liquid cooling plate 1 is arranged in at least one of the receiving gaps. The liquid cooling plate 1 is located in the receiving gap, so that the pole piece in the battery cell 2 can be directly cooled, thereby improving the heat dissipation efficiency of the single battery.

[0046] To ensure safety, the liquid cooling plate 1 is located in the accommodation gap formed between the negative electrode plate 25 of the battery cell 2 and the adjacent diaphragm 23. Of course, in other specific embodiments, the liquid cooling plate 1 can also be located in the accommodation gap formed between the positive electrode plate 24 of the battery cell 2 and the adjacent diaphragm 23. Specifically, there is one liquid cooling plate 1, one positive electrode plate 24 and one negative electrode plate 25, and the liquid cooling plate 1 is located in the accommodation gap formed between the negative electrode plate 25 and the diaphragm 23 on the side of the corresponding negative electrode plate 25 facing away from the positive electrode plate 24. Even if the liquid cooling plate 1 contacts the negative electrode plate 25, since both the liquid cooling plate 1 and the negative electrode plate 25 are at low potential, it will not cause insulation breakdown.

[0047] In order to improve the heat dissipation effect of the single battery, in other specific embodiments, there are two liquid cooling plates 1, and they are arranged in different accommodation gaps. By increasing the number of liquid cooling plates 1, the heat exchange area between the liquid cooling plates 1 and the electrolyte is increased, and the heat dissipation performance of the single battery is improved. Of course, in other specific embodiments, there can also be three, four or other numbers of liquid cooling plates 1.

[0048] Of course, in other specific embodiments, referring to the structure of the single cell battery core in the Chinese utility model patent with authorization announcement number CN217848088U and authorization announcement date of 2022.11.18, the battery cell 2 can also be wound, and a hollow area is formed inside the battery cell 2, and the liquid cooling plate 1 is located in the hollow area, thereby improving the heat dissipation capacity of the single cell; different from the above patent, in this embodiment, no aluminum-plastic film is provided on the inner circumferential surface of the battery cell 2, that is, in the hollow area, the liquid cooling plate 1 is in contact with the electrolyte.

[0049] In order to conveniently realize the sealed connection between the liquid inlet 11 and the liquid outlet 12 of the liquid cooling plate 1 and the outer protective film 3, as a specific implementation method, Figure 8 As shown, an insulating hot melt adhesive layer 4 is provided on the liquid inlet 11 and the liquid outlet 12, and an insulating hot melt adhesive layer 4' is also provided on the outer protective film 3 used to connect with the liquid inlet 11 and the liquid outlet 12; the liquid cooling plate 1 and the outer protective film 3 can be conveniently sealed by heat sealing technology to ensure the sealing of the single battery.

[0050] However, in other specific embodiments, the insulating hot melt adhesive layer 4 may be provided only on the liquid inlet 11 and the liquid outlet 12; or, the insulating hot melt adhesive layer 4' may be provided only on the portion of the outer protective film 3 that is used to connect with the liquid inlet 11 and the liquid outlet 12. Alternatively, the liquid inlet 11 and the liquid outlet 12 are sealed and connected to the outer protective film 3 by a non-hot melt sealant.

[0051] Specifically, the insulating hot melt adhesive layer 4 provided on the liquid inlet 11 and the liquid outlet 12 and the insulating hot melt adhesive layer 4' provided on the outer protective film 3 can be the same insulating hot melt adhesive layer or different insulating hot melt adhesive layers (different thickness, size, or type of adhesive, etc.).

[0052] In order to facilitate the connection of the liquid inlet pipe and the liquid outlet pipe on the liquid inlet part 11 and the liquid outlet part 12, as a specific implementation method, Figure 5-6 As shown, the battery cell 2 has a positive electrode sheet 24 and a negative electrode sheet 25, a positive electrode tab 21 is provided on the positive electrode sheet 24, and a negative electrode tab 22 is provided on the negative electrode sheet 25, the positive electrode tab 21 and the negative electrode tab 22 are located on one side of the battery cell 2, and the liquid inlet 11 and the liquid outlet 12 of the liquid cooling plate 1 are both located on the side of the single cell where the tab is not located, that is, the side of the single cell where the tab is not provided. Specifically, as Figure 1-4As shown, the liquid inlet 11 and the liquid outlet 12 of the liquid cooling plate 1 are located on the same side of the liquid cooling plate 1. The liquid inlet 11 and the liquid outlet 12 are both located on the side of the single cell where the tab is not located. After the single cell is electrically connected to the electrical equipment through the tab, the liquid inlet 11 and the liquid outlet 12 can be located on the side of the single cell or away from the electrical equipment, so as to facilitate the connection of the liquid inlet pipe and the liquid outlet pipe.

[0053] However, in other specific embodiments, the positive electrode tab 21 and the negative electrode tab 22 may also be located on both sides of the battery cell 2. In this case, the liquid inlet 11 may also be located on the side where the positive electrode tab 21 is located, and the liquid outlet 12 may also be located on the side where the negative electrode tab 22 is located; or, the positive electrode tab 21, the negative electrode tab 22, the liquid inlet 11, and the liquid outlet 12 are all located on different sides of the battery cell 2. In this embodiment, the positions of the positive electrode tab 21, the negative electrode tab 22, the liquid inlet 11, and the liquid outlet 12 are not limited.

[0054] As a specific implementation method, Figure 3-4 As shown, the liquid inlet 11 and the liquid outlet 12 of the liquid cooling plate 1 extend out of the outer protective film 3 and are bent upward to form a bent portion 13. Specifically, the liquid inlet 11 and the liquid outlet 12 can be arranged as follows: Figure 3 Alternatively, the liquid inlet 11 and the liquid outlet 12 may be arranged as shown in Figure 4 The shorter side of the liquid cooling plate 1 shown in FIG. The portions of the liquid inlet 11 and the liquid outlet 12 extending out of the outer protective film 3 are bent upward to form a bent portion 13, which can reduce the rectangular space occupied by the single battery. However, in other specific embodiments, such as Figure 1-2 As shown, the liquid inlet 11 may not include the bending portion 13, and the liquid outlet 12 may not include the bending portion 13, that is, the liquid cooling plate 1 is a flat plate structure. In this case, the liquid inlet 11 and the liquid outlet 12 may be arranged as follows: Figure 1 Alternatively, the liquid inlet 11 and the liquid outlet 12 may be arranged as shown in Figure 2 The shorter side of the liquid cooling plate 1 is shown. In this embodiment, the relative positions of the liquid inlet 11 and the liquid outlet 12 and the liquid cooling plate 1 are not limited.

[0055] In order to reduce the volume of a single battery, as a specific implementation method, Fig. 9 As shown, the liquid cooling plate 1 protrudes outward to form a protrusion, and the interior of the protrusion is hollowed out to form a flow channel 14 whose two ends are respectively connected to the liquid inlet 11 and the liquid outlet 12.

[0056] However, in other specific embodiments, such as Fig.10As shown, the liquid cooling plate 1 may also be a rectangular liquid cooling plate, and a through hole is provided in the liquid cooling plate 1 to form a flow channel 14; or, the liquid cooling plate 1 is a hollow plate, and the hollow part of the liquid cooling plate 1 constitutes the flow channel 14 for the flow of the coolant; or, the liquid cooling plate 1 is a liquid cooling plate in the prior art, and the structure of the liquid cooling plate 1 is not limited in this embodiment.

[0057] Compared with the technical solution in which the liquid cooling plate 1 is rectangular and a through hole is provided in the rectangular liquid cooling plate to form the flow channel 14, the liquid cooling plate 1 is protruded outward to form a protrusion, and the inside of the protrusion is hollowed out to form the flow channel 14. This can reduce the volume of the liquid cooling plate 1. When the liquid cooling plate 1 is located inside the single cell and in contact with the electrolyte, the electrolyte can fill the space between adjacent protrusions, thereby increasing the volume percentage of the electrolyte in the single cell, which is beneficial to improving the energy density of the single cell.

[0058] Of course, in other specific embodiments, the liquid cooling plate 1 may also be cylindrical or in other shapes, and the shape of the liquid cooling plate 1 is not limited in this embodiment. It should be noted that the liquid cooling plate 1 may also be a whole rectangular plate, in which case the end of the rectangular plate with the liquid inlet constitutes the liquid inlet portion 11, the end of the rectangular plate with the liquid outlet constitutes the liquid outlet portion 12, and the rest of the rectangular plate is located inside the outer protective film 3; of course, the liquid inlet portion 11 and the liquid outlet portion 12 may be arranged at the same end or at different ends of the rectangular plate.

[0059] It should be noted that the liquid inlet 11 and the liquid outlet 12 are part of the liquid cooling plate 1 , and the liquid inlet and the liquid outlet are openings respectively arranged on the liquid inlet 11 and the liquid outlet 12 , and have no length, so the liquid inlet 11 and the liquid outlet 12 are also provided with a flow channel 14 .

[0060] Specific embodiments of the electrical equipment provided by the utility model:

[0061] The purpose of this embodiment is to provide an electrical device, which improves the heat dissipation capacity of the single battery and the electrical device by immersing a liquid cooling plate connected to the outside in the electrolyte of the single battery.

[0062] The electrical device includes a single cell. The specific structure of the single cell is the same as the structure in the specific embodiment of the single cell mentioned above, and will not be described in detail here.

[0063] Finally, it should be noted that the above are only preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A single battery, comprising an outer protective film, a battery cell encapsulated in the outer protective film, and an electrolyte filled in the outer protective film, characterized in that: It also includes a liquid cooling plate in direct contact with the electrolyte, the liquid cooling plate includes a liquid inlet and a liquid outlet with one end extending out of the outer protective film, and the liquid inlet and the liquid outlet are sealedly connected to the outer protective film; the liquid cooling plate is made of a heat-conducting insulating material, or a heat-conducting insulating layer is provided on the outer surface of the liquid cooling plate.

2. The single cell according to claim 1, characterized in that: The battery cells are stacked, and the battery cells include pole pieces and diaphragms. A receiving gap is formed between the pole pieces and adjacent diaphragms, and the liquid cooling plate is arranged in at least one of the receiving gaps.

3. The single cell according to claim 2, characterized in that: The liquid cooling plate is located in a receiving gap formed between the negative electrode sheet of the battery cell and the diaphragm on the side of the corresponding negative electrode sheet facing away from the positive electrode sheet.

4. The single cell according to any one of claims 1 to 3, characterized in that: An insulating hot melt adhesive layer is arranged on the liquid inlet and the liquid outlet.

5. The single cell according to claim 4, characterized in that: An insulating hot-melt adhesive layer is also provided on the portion of the outer protective film that is connected with the liquid inlet and the liquid outlet.

6. The single cell according to any one of claims 1 to 3, characterized in that: The liquid inlet and outlet of the liquid cooling plate are both located on the side where the lugs of the single cell are not located.

7. The single cell according to claim 6, characterized in that: The liquid inlet and the liquid outlet of the liquid cooling plate are located on the same side of the liquid cooling plate.

8. The single cell according to any one of claims 1 to 3, characterized in that: The portion of the liquid inlet and / or the liquid outlet of the liquid cooling plate extending out of the outer protective film is bent upward.

9. The single cell according to any one of claims 1 to 3, characterized in that: The liquid cooling plate protrudes outward to form a protruding portion, and the interior of the protruding portion is hollowed out to form a flow channel with two ends respectively connected to the liquid inlet portion and the liquid outlet portion.

10. An electrical device, comprising a single battery, characterized in that: The single cell is the single cell according to any one of claims 1 to 9.

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