Battery, battery pack and energy storage system

Abstract

The embodiment of the utility model provides a battery, a battery pack and an energy storage system, relates to the technical field of batteries, and aims to solve the problem of temperature imbalance in the battery. The battery comprises a cover plate, a plurality of side plates, a battery cell and pins, the cover plate is perpendicular to the side plates, the side plates and the cover plate define a containing cavity, and the battery cell is located in the containing cavity. The cover plate is provided with a pole, the battery cell is provided with a tab, the pin comprises a first section and a second section which are connected, the first section is used for electrically connecting the tab and the pole, and the first section is positioned between the tab of the battery cell and the cover plate. The second section is positioned between the battery cell and one of the plurality of side plates, and a heat-conducting insulating plate is arranged between the second section and one of the side plates. According to the battery provided by the invention, heat inside the battery can be transferred to the side plates of the battery through the pins and the heat-conducting insulating plates, so that a heat-conducting link from the battery cell to the side plates is established, the heat dissipation efficiency inside the battery is improved, the temperature inside the battery is more balanced, and the condition that the temperature inside the battery is unbalanced is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and in particular to a battery, a battery pack and an energy storage system. BACKGROUND

[0002] In a battery pack, a battery is cooled by liquid cooling, which can effectively improve the cooling efficiency of the battery. For example, a cold plate is attached to the shell of the battery to take away the heat on the surface of the battery, thereby reducing the temperature of the battery.

[0003] In actual applications, the cold plate is usually in contact with one surface or two surfaces of the battery, which causes the temperature imbalance inside the battery, shortens the service life of the battery and reduces the charging efficiency of the battery. Meanwhile, as the capacity of the battery gradually increases, the temperature imbalance inside the battery is further aggravated, which seriously affects the performance of the battery. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery, a battery pack and an energy storage system to improve the heat dissipation efficiency inside the battery and improve the temperature imbalance inside the battery.

[0005] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a battery, which comprises a cover plate, a plurality of side plates, a battery cell and a pin. The cover plate is perpendicular to the plurality of side plates. The plurality of side plates and the cover plate enclose a receiving cavity, and the battery cell is located in the receiving cavity. The cover plate is provided with a pole. The battery cell is provided with a tab. The pin comprises a first segment and a second segment connected with each other. The first segment is used for electrically connecting the tab and the pole, and the first segment is located between the tab of the battery cell and the cover plate. The second segment is located between the battery cell and one of the plurality of side plates. A thermally conductive insulating plate is arranged between the second segment and the one of the plurality of side plates.

[0007] In the battery provided by the present application, the first segment of the pin electrically connects the pole and the tab, and the current of the battery cell can flow to the pin through the tab and then flow to the pole. The pole is electrically connected with an external device to supply power to the external device.

[0008] During the operation of the battery, the heat transferred from the cell to the pin and the heat generated by the pin due to the ohmic effect can be partially transferred to the cover plate and partially transferred from the first segment of the pin to the second segment of the pin. Since the heat-conducting insulation plate is arranged between the second segment of the pin and one of the plurality of side plates, the heat transferred to the second segment of the pin can be transferred to the heat-conducting insulation plate along the direction of the temperature gradient, and then to the one of the plurality of side plates. The one of the plurality of side plates can exchange heat with the external environment. The external environment can take away the heat of the one of the plurality of side plates, so that there is always a temperature difference between the one of the plurality of side plates and the heat-conducting insulation plate, and similarly, there is always a temperature difference between the heat-conducting insulation plate and the second segment of the pin. In this way, the heat of the pin can be continuously transmitted to the outside of the battery.

[0009] Through such an arrangement, a heat-conducting link between the cell and the side plate can be established. Compared with the battery in the prior art in which no heat-conducting link is established between the cell and the side plate, the battery provided in the present application increases the heat dissipation path from the inside of the battery to the outside of the battery, thereby further improving the heat dissipation efficiency of the inside of the battery, making the temperature of the inside of the battery more balanced, and improving the temperature imbalance of the inside of the battery.

[0010] In one embodiment, the tab includes a positive tab and a negative tab, the post includes a positive post and a negative post, and the pin includes a first pin and a second pin. The first segment of the first pin is electrically connected to the positive tab and the positive post. The first segment of the second pin is electrically connected to the negative tab and the negative post. The positive tab and the negative tab are respectively located on opposite sides of the cell. The second segment of the first pin and the second segment of the second pin are located on the same side of the cell.

[0011] The positive tab and the negative tab are respectively located on opposite sides of the cell, and the heat of the positive tab can be transmitted to one of the plurality of side plates through the first pin. The heat of the negative tab can be transmitted to one of the plurality of side plates through the second pin. Such an arrangement can further increase the heat dissipation path from the cell to the outside of the battery, thereby further improving the heat dissipation efficiency of the cell and improving the temperature imbalance of the inside of the cell, thereby being beneficial to further improving the temperature imbalance of the inside of the battery.

[0012] The second segment of the first pin and the second segment of the second pin are located on the same side of the cell, which can be understood as being located between the same side plate and the cell.

[0013] In some embodiments, one of the plurality of side plates is provided with a liquid cooling plate away from one side of the battery cell, and the liquid cooling plate is used for heat exchange with the one of the plurality of side plates to achieve the purpose of cooling the battery. The second segment of the first pin and the second segment of the second pin are located between the one of the plurality of side plates and the battery cell, which can achieve heat dissipation of the second segment of the first pin and the second segment of the second pin through heat exchange between the liquid cooling plate and the one of the plurality of side plates. On the other hand, the size of the battery can be reduced, thereby reducing the occupied space of the battery and facilitating the miniaturization design of the battery.

[0014] In an embodiment, the battery further comprises a first insulating plate, and the second segment of the first pin and the second segment of the second pin are located between the first insulating plate and the battery cell, and the first insulating plate is in contact with the battery cell, the second segment of the first pin and the second segment of the second pin, respectively.

[0015] Through the first insulating plate, the battery cell and the second segment of the first pin can be electrically isolated to prevent electrical connection between the battery cell and the second segment of the first pin, thereby preventing internal short circuit of the battery and ensuring safe operation of the battery. Similarly, through the first insulating plate, the battery cell and the second segment of the second pin can be electrically isolated to prevent electrical connection between the battery cell and the second segment of the second pin, thereby preventing internal short circuit of the battery and ensuring safe operation of the battery.

[0016] In some embodiments, the second segment of the first pin and the second segment of the second pin are located between the first insulating plate and the battery cell, which can reduce the number of parts of the battery and reduce the assembly process and difficulty of the battery compared to the insulating structure arranged between the second segment of the first pin and the battery cell and the second segment of the second pin and the battery cell, respectively.

[0017] In an embodiment, the thermal conductivity of the heat-conducting insulating plate is greater than the thermal conductivity of the first insulating plate.

[0018] Since the thermal conductivity of the heat-conducting insulating plate is greater than the thermal conductivity of the first insulating plate, the heat of the first insulating plate, the heat of the second segment of the first pin and the heat of the second segment of the second pin tend to be transmitted to the heat-conducting insulating plate, and then transmitted to the side plate through the heat-conducting insulating plate, thereby improving the heat dissipation efficiency of the battery, further improving the temperature imbalance in the battery, and ensuring the operation reliability of the battery. In addition, it can also prevent the heat from being transmitted to the battery cell to cause local temperature rise of the battery cell, thereby ensuring the safe operation of the battery cell.

[0019] In an embodiment, the second segment of the first pin and the second segment of the second pin are spaced apart. The surface of the first insulating plate away from the battery cell is provided with a protrusion, and the protrusion is located between the second segment of the first pin and the second segment of the second pin.

[0020] The distance between the second segment of the first pin and the second segment of the second pin should meet the safety specifications and standard requirements (such as electrical clearance, creepage distance, and other safety specifications and standard requirements) to prevent short circuit caused by too small distance between the first pin and the second pin.

[0021] The second segment of the first pin and the second segment of the second pin are separated by the protrusion, which prevents short circuit between the first pin and the second pin caused by displacement of the first pin and the second pin in the battery, and ensures safe operation of the battery.

[0022] In an embodiment, the minimum distance between the first insulating plate and the first segment of the first pin is smaller than the distance between the positive tab and the first segment of the first pin, and / or the minimum distance between the first insulating plate and the first segment of the second pin is smaller than the distance between the negative tab and the first segment of the second pin.

[0023] The minimum distance between the first insulating plate and the first segment of the first pin is smaller than the distance between the positive tab and the first segment of the first pin, which means that the first insulating plate is located between the positive tab and one of the side plates to prevent the positive tab from contacting the one of the side plates and causing internal short circuit of the battery.

[0024] In addition, the end of the pole piece of the battery cell and the first segment of the first pin are spaced apart, which prevents the first segment of the first pin from contacting the pole piece of the battery cell and causing internal short circuit of the battery, and ensures insulation between the battery cell and the first pin.

[0025] Similarly, the distance between the first insulating plate and the first segment of the second pin is smaller than the distance between the negative tab and the first segment of the second pin, which means that the first insulating plate is located between the negative tab and one of the side plates to prevent the negative tab from contacting the one of the side plates and causing internal short circuit of the battery. In addition, the end of the pole piece of the battery cell and the first segment of the second pin are spaced apart, which prevents the first segment of the second pin from contacting the pole piece of the battery cell and causing internal short circuit of the battery, and ensures insulation between the battery cell and the second pin.

[0026] In an embodiment, the cover plate includes a first cover plate, and the positive tab is arranged on the first cover plate. A second insulating plate is arranged between the first segment of the first pin and the first cover plate, and the second insulating plate contacts the first segment of the first pin and the first cover plate respectively. The thermal conductivity of the heat-conducting insulating plate is greater than the thermal conductivity of the second insulating plate.

[0027] The second insulating plate can electrically isolate the first cover plate and the first segment of the first pin, prevent electrical connection between the first cover plate and the first segment of the first pin, and cause internal short circuit of the battery, and ensure safe operation of the battery.

[0028] Since the positive pole post is located on the first cover plate for connecting external devices, and the thermal conductivity of the heat-conducting insulating plate is greater than that of the second insulating plate, the heat transferred to the first pin is more inclined to be transferred to the heat-conducting insulating plate, and then the heat is transferred to the side plate through the heat-conducting insulating plate, on the one hand, it can prevent the heat from concentrating at the positive pole post to affect the electrical connection between the positive pole post and the external devices, on the other hand, through the design of the heat-conducting link, the heat of the first pin is transmitted to the liquid cooling plate of the battery through the heat-conducting insulating plate as much as possible, so as to improve the heat dissipation efficiency of the battery, further improve the temperature imbalance inside the battery, and ensure the operation reliability of the battery.

[0029] In an embodiment, one end of the heat-conducting insulating plate towards the first cover plate is in contact with the second insulating plate.

[0030] Since the heat-conducting insulating plate is located between the second section of the first pin and one of the side plates, and the second insulating plate is located between the first section of the first pin and the first cover plate, by making one end of the heat-conducting insulating plate towards the first cover plate in contact with the second insulating plate, it can ensure the insulation between the second section of the first pin and the first cover plate, and ensure the insulation between the first section of the first pin and one of the side plates, further ensuring the safe operation of the battery.

[0031] In an embodiment, the cover plate includes a second cover plate, and the negative pole post is arranged on the second cover plate. A third insulating plate is arranged between the first section of the second pin and the second cover plate, and the third insulating plate is in contact with the first section of the second pin and the second cover plate respectively. The thermal conductivity of the heat-conducting insulating plate is greater than that of the third insulating plate.

[0032] Through the third insulating plate, the second cover plate and the first section of the second pin can be electrically isolated, preventing the electrical connection between the second cover plate and the first section of the second pin from causing internal short circuit of the battery, and ensuring the safe operation of the battery.

[0033] Since the negative pole post is located on the second cover plate for connecting external devices, and the thermal conductivity of the heat-conducting insulating plate is greater than that of the third insulating plate, the heat transferred to the second pin is more inclined to be transferred to the heat-conducting insulating plate, and then the heat is transferred to the side plate through the heat-conducting insulating plate, on the one hand, it can prevent the heat from concentrating at the negative pole post to affect the electrical connection between the negative pole post and the external devices, on the other hand, through the design of the heat-conducting link, the heat of the second pin is transmitted to the liquid cooling plate of the battery through the heat-conducting insulating plate as much as possible, so as to improve the heat dissipation efficiency of the battery, further improve the temperature imbalance inside the battery, and ensure the operation reliability of the battery.

[0034] In an embodiment, one end of the heat-conducting insulating plate towards the second cover plate is in contact with the third insulating plate.

[0035] Since the heat-conducting insulation plate is located between the second segment of the second pin and one of the side plates, and the third insulation plate is located between the first segment of the second pin and the second cover plate, by making the end of the heat-conducting insulation plate that faces the second cover plate in contact with the third insulation plate, insulation between the second segment of the second pin and the second cover plate can be ensured, and insulation between the first segment of the second pin and one of the side plates can be ensured, further ensuring safe operation of the battery.

[0036] In an embodiment, the pin is a one-piece structure.

[0037] The pin is a one-piece structure, which can facilitate processing, manufacturing and assembly of the pin, reduce production cost and assembly process. In addition, the first pin is a one-piece structure, which can be more conducive to heat transfer, thereby ensuring the heat dissipation efficiency of the heat conduction link between the pin and the side plate.

[0038] In an embodiment, the positive tab includes a plurality of positive tabs extending from the cell, and the plurality of positive tabs converge to form a full tab. The negative tab includes a plurality of negative tabs extending from the cell, and the plurality of negative tabs converge to form a full tab.

[0039] It can be understood that the positive tab and the negative tab of the cell are full tabs. Full tab, also known as no tab. Compared with the single tab positive tab and the single tab negative tab, through the full tab positive tab and the full tab negative tab, the current conduction area of the positive tab and the negative tab can be increased, and the current transmission distance can be shortened, so that the current distribution inside the cell can be more balanced, and the problem of uneven current distribution inside the cell is improved.

[0040] In addition, the full tab positive tab and the full tab negative tab can also greatly reduce the internal resistance of the battery, reduce the amount of heat, and prolong the service life of the battery.

[0041] In an embodiment, the positive tab includes a plurality of positive tabs, each of which is electrically connected to the first pin, and adjacent two positive tabs are arranged at intervals. The negative tab includes a plurality of negative tabs, each of which is electrically connected to the second pin, and adjacent two negative tabs are arranged at intervals.

[0042] It can be understood that the positive tab and the negative tab of the cell are full tabs. Compared with single tab, the number of tabs of multi-tab is increased, so that the current capacity of the battery and the power output of the battery can be significantly improved.

[0043] In addition, the plurality of positive tabs and the plurality of negative tabs can also make the current distribution inside the battery more uniform, improve the problem of uneven current distribution inside the cell, and reduce local overheating and potential safety risks.

[0044] In a second aspect, the present application provides a battery pack, which comprises a liquid cooling plate and the battery described above, and a thermally conductive insulating plate arranged between one of the side plates and the battery cell, and the liquid cooling plate is arranged on the side of one of the side plates away from the battery cell.

[0045] The liquid cooling plate is arranged on the side of one of the side plates away from the battery cell to dissipate heat from one of the side plates and the thermally conductive insulating plate between one of the side plates and the battery cell, so that the heat inside the battery can be transmitted to the liquid cooling plate along the temperature gradient, further improving the heat dissipation efficiency inside the battery, making the temperature inside the battery more balanced, and further improving the temperature imbalance inside the battery.

[0046] Compared with the arrangement of the liquid cooling plate on the plurality of side plates of the shell, arranging the liquid cooling plate on the side of one of the side plates away from the battery cell can reduce the footprint of the liquid cooling plate while ensuring the same heat dissipation effect, which is conducive to the miniaturization design of the battery pack.

[0047] In addition, the battery pack provided by the present application comprises the battery described above, so the battery pack provided by the present application and the battery of the above technical solution can solve the same technical problems and have the same technical effects, which will not be described here.

[0048] In a third aspect, the present application provides an energy storage system, which comprises the battery pack described above and a power converter, and the power converter is used to perform power conversion on the voltage output by the battery pack.

[0049] The battery pack is used to store and release electrical energy, for example, the battery pack is connected with an electrical equipment to supply power to the electrical equipment.

[0050] The power converter performs power conversion on the voltage output by the battery pack to meet the power demand of different electrical equipment, so that the energy storage system can better adapt to various application scenarios and demand changes.

[0051] In addition, the energy storage system provided by the present application comprises the battery pack described above, so the energy storage system provided by the present application and the battery pack of the above technical solution can solve the same technical problems and have the same technical effects, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A structural schematic diagram of an energy storage system provided by an embodiment of the present application;

[0053] Figure 2 A structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0054] Figure 3A A structural schematic diagram of a battery provided by an embodiment of the present application;

[0055] Figure 3B for Figure 3A A schematic diagram of the internal structure of the battery in the diagram;

[0056] Figure 4 This is one of the exploded views of a battery provided in the embodiments of this application;

[0057] Figure 5 This is a second exploded view of a battery provided in an embodiment of this application;

[0058] Figure 6 This is one of the partial structural schematic diagrams of a battery provided in an embodiment of this application;

[0059] Figure 6A This is a second partial structural schematic diagram of a battery provided in an embodiment of this application;

[0060] Figure 6B This is a third partial structural schematic diagram of a battery provided in an embodiment of this application;

[0061] Figure 7 This is the third exploded view of a battery provided in the embodiments of this application;

[0062] Figure 8 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0063] Figure 9 This is a schematic diagram of another battery cell provided in an embodiment of this application.

[0064] Figure label:

[0065] 1000 - Energy storage system; 100 - Battery pack; 10 - Battery; 20 - Liquid cooling plate; 30 - Housing; 200 - Power converter; 300 - Power grid; 400 - Load;

[0066] 1-Outer shell; 11-First cover plate; 12-Second cover plate; 13-Side plate; 131-Bottom side plate; 14-Explosion-proof valve;

[0067] 2-Battery cell; 21-Positive electrode tab; 22-Negative electrode tab;

[0068] 31 - Positive terminal; 32 - Negative terminal;

[0069] 41 - First pin; 42 - Second pin; 401 - First segment; 402 - Second segment;

[0070] 5- Thermally conductive insulating plate;

[0071] 61-First insulating plate; 611-Protrusion; 62-Second insulating plate; 63-Third insulating plate;

[0072] 71 - positive electrode tab; 72 - negative electrode tab;

[0073] 01 - first hole; 02 - second hole; 03 - accommodating cavity. DETAILED DESCRIPTION

[0074] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0075] In the present application, unless specifically defined and limited otherwise, the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship as shown in the drawings, which can include but not limited to the orientation of the components shown in the drawings, and these directional terms can be relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components shown in the drawings, and cannot be understood as a limitation to the present application.

[0076] In the present application, the terms "first", "second", and the like are only for descriptive purposes, and are used to distinguish one element from another element, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features.

[0077] In the present application, unless specifically defined and limited otherwise, the meaning of "multiple" is two or more.

[0078] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing pipelines or channels, the terms "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0079] In addition, in the present application, the words "exemplary" or "for example" are used to indicate an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" and the like is intended to present the relevant concept in a specific manner.

[0080] In the drawings of the embodiments of the present application, the entity structures of components, assemblies, etc. are represented by guide lines; the hollow structures of openings, holes, spaces, cavities, etc. are represented by guide lines with arrows.

[0081] The energy storage system provided by the embodiments of the present application can be applied to various application fields such as household energy storage, industrial energy storage, data center, power station and vehicle. The embodiments of the present application do not specially limit the specific application field of the energy storage system.

[0082] Figure 1 A structural schematic diagram of an energy storage system is shown. Referring to Figure 1 , the energy storage system 1000 includes a battery pack 100 and a power converter 200, and the power converter 200 is electrically connected with the battery pack 100.

[0083] The battery pack 100 is used for storing and releasing electric energy. The power converter 200 is used for power conversion of the voltage output by the battery pack 100 to meet the power consumption demand of different power consumption devices, so that the energy storage system can better adapt to various application scenarios and demand changes.

[0084] For example, in some embodiments, the power converter 200 can be a direct current-alternating current converter, i.e. a DC-AC converter, to convert the direct current output by the battery pack 100 into alternating current to provide alternating current for the power grid 300 or the load 400 (such as household appliances such as air conditioners, washing machines, etc. or industrial equipment such as electric motors, generators, etc.).

[0085] For another example, in some examples, the power converter 200 is a direct current-direct current converter, i.e. a DC-DC converter, to convert the direct current output by the battery pack 100 into direct current with different voltage values to provide direct current for power consumption devices with different voltage requirements.

[0086] Figure 2 A structural schematic diagram of a battery pack is shown. Referring to Figure 2 , the battery pack 100 includes a battery 10 and a liquid cooling plate 20. The battery 10 is used for providing electric energy to power consumption devices. The liquid cooling plate 20 is used for cooling the battery 10 to effectively reduce the temperature of the battery 10 and reduce the risk of thermal runaway of the battery 10, thereby guaranteeing the safe operation of the battery 10.

[0087] Referring to Figure 2 , the pole column of the battery 10 includes a positive pole column 31 and a negative pole column 32. When the battery 10 is in an installed state, the positive pole column 31 and the negative pole column 32 are located at opposite sides of the battery 10 (such as the left and right sides of the figure in Figure 2 , and the liquid cooling plate 20 is arranged at the bottom side of the battery 10 (such as the bottom side of the figure in Figure 2The heat inside the battery 10 can be transferred to the liquid cooling plate 20 through the battery shell during the operation of the battery 10. The liquid cooling plate 20 exchanges heat with the battery shell to reduce the temperature of the battery shell, thereby forming a temperature difference between the inside of the battery 10 and the battery shell, which can ensure that the heat inside the battery 10 can be continuously transferred to the battery shell and exchanged with the liquid cooling plate 20 to reduce the internal temperature of the battery 10 and reduce the risk of thermal runaway of the battery 10. The structure, working principle and setting method of the liquid cooling plate are well known to those skilled in the art, which will not be described here.

[0088] In some embodiments, the shell of the battery 10 can be made of a material with good thermal conductivity, such as aluminum, to improve the heat conduction performance of the battery shell, rapidly transfer heat to the liquid cooling plate 20, and improve the heat dissipation efficiency of the battery 10.

[0089] In some embodiments, referring to Figure 2 , the battery pack 100 further includes a housing 30, and the battery 10 and the liquid cooling plate 20 are accommodated inside the housing 30. The housing 30 can reduce the influence of external factors (such as moisture, dust and corrosive gas, etc.) on the battery 10 and the liquid cooling plate 20, prolong the service life of the battery 10 and the liquid cooling plate 20, and ensure the operation reliability of the battery 10 and the liquid cooling plate 20.

[0090] In Figure 2 the embodiment shown, the battery 10 is a secondary battery, i.e. a battery that can be activated by charging after discharging. For example, a lithium ion battery, a lead-acid battery, a sodium battery, a magnesium battery, an aluminum battery or a potassium battery, etc. The specific form of the battery 10 can be selectively designed according to the application scenario. For example, in a fuel vehicle, the battery can be a lead-acid battery. In an electric vehicle, the battery can be a lithium ion battery. The specific form of the battery 10 is not limited in the present application.

[0091] In Figure 3A the embodiment shown, the battery 10 is a square battery, also known as a rectangular battery, which has the advantages of low degree of electrical cost and high degree of assembly simplification. In actual application, the square battery can be customized according to the actual space and power requirements of the application scenario to achieve the best performance and space utilization.

[0092] Hereinafter, the battery 10 is taken as a square battery, and the liquid cooling plate 20 is arranged on the bottom side of the battery 10 as an example for description.

[0093] Figure 3B A structural schematic diagram of a battery is shown. Figure 2 An internal structural schematic diagram of the battery in Figure 3A is shown. Referring to Figure 3B and Figure 3A, the battery 10 comprises a shell 1, the shell 1 comprises a cover plate and a plurality of side plates 13, the cover plate comprises a first cover plate 11 and a second cover plate 12, and the first cover plate 11, the second cover plate 12 and the plurality of side plates 13 enclose a containing cavity 03. The battery 10 further comprises a battery cell 2, and the battery cell 2 is contained in the containing cavity 03.

[0094] Referring to Figure 3B and Figure 2 , the battery 10 comprises four side plates 13, which are respectively located at the upper side, the lower side, the front side and the rear side of the battery cell 2. Among them, referring to Figure 2 , the direction indicated by the Z-direction arrow is the upper side of the battery cell 2, and the direction opposite to the direction indicated by the Z-direction arrow is the lower side of the battery cell 2. The direction indicated by the X-direction arrow is the front side of the battery cell 2, and the direction opposite to the direction indicated by the X-direction arrow is the rear side of the battery cell 2.

[0095] In this embodiment, the four side plates 13 comprise a bottom side plate 131 located below the battery cell 2. A liquid cooling plate 20 (as shown in Figure 3A ) is arranged on the side of the bottom side plate 131 away from the battery cell 2. The liquid cooling plate 20 cools the bottom side plate 131, so that a temperature difference is formed between the bottom side plate 131 and the inside of the battery 10. The heat in the battery 10 will be transferred to the bottom side plate 131 along the temperature gradient direction and then exchanged with the liquid cooling plate 20, so as to achieve the purpose of reducing the internal temperature of the battery 10 and ensure the operation reliability of the battery 10.

[0096] The positive pole 31 is arranged on the first cover plate 11, and the negative pole 32 is arranged on the second cover plate 12. While ensuring the current transmission of the battery cell 2, the heat of the positive pole 31 can be conducted out through the first cover plate 11, and the heat of the negative pole 32 can be conducted out through the second cover plate 12, which is conducive to improving the heat dissipation efficiency of the battery 10.

[0097] In the embodiments shown in Figure 3B and Figure 4 , the battery 10 can further comprise an explosion-proof valve 14 arranged on the side plate 13, such as the side plate 13 located at the upper side of the battery cell 2, so as to play a role in explosion-proof. In addition, compared with arranging the explosion-proof valve 14 on the cover plate, arranging the explosion-proof valve 14 on the side plate 13 can make the explosion-proof valve 14 closer to the inner cavity of the battery, and the heat dissipation path is shortened, which helps to release heat faster when the internal temperature of the battery 10 rises, and reduces the risk of thermal runaway of the battery 10.

[0098] Figure 3B An exploded view of a battery is shown. Referring to Figure 4 and Figure 4 , the first cover plate 11 comprises a first hole 01, and the first hole 01 is along the thickness direction of the first cover plate 11 (as shown in Figure 4The first cover plate 11. The positive pole 31 is arranged in the first hole 01. The second cover plate 12 includes a second hole 02, which extends through the second cover plate 12 in the thickness direction (as shown in the Z direction) of the second cover plate 12. The negative pole 32 is arranged in the second hole 02. Figure 2 The first cover plate 11. The positive pole 31 is arranged in the first hole 01. The second cover plate 12 includes a second hole 02, which extends through the second cover plate 12 in the thickness direction (as shown in the Z direction) of the second cover plate 12. The negative pole 32 is arranged in the second hole 02.

[0099] The battery 10 also includes pins, including a first pin 41 and a second pin 42, which are accommodated in the accommodation cavity 03. The battery cell 2 includes a positive tab 21 arranged on the side of the battery cell 2 facing the first cover plate 11 and a negative tab 22 arranged on the side of the battery cell 2 facing the second cover plate 12. The first pin 41 is electrically connected to the positive tab 21 and the positive pole 31, and the second pin 42 is electrically connected to the negative tab 22 and the negative pole 32. The current of the battery cell 2 can flow to the first pin 41 and the second pin 42 through the positive tab 21 and the negative tab 22, and then to the positive pole 31 and the negative pole 32. The positive pole 31 and the negative pole 32 are electrically connected to an external device to form a charging circuit for supplying power to the external device.

[0100] Since the liquid cooling plate 20 only exchanges heat with the bottom side plate 131, this causes the temperature inside the battery 10 to be uneven, which shortens the service life of the battery 10 and reduces the charging efficiency of the battery 10. In order to improve the temperature imbalance inside the battery 10, the first pin 41 and the second pin 42 are both designed to include a first section 401 and a second section 402 connected together. The first section 401 of the first pin 41 is located between the first cover plate 11 and the positive tab 21, and the second section 402 of the first pin 41 is located between the bottom side plate 131 and the battery cell 2. The first section 401 of the second pin 42 is located between the second cover plate 12 and the negative tab 22, and the second section 402 of the second pin 42 is located between the bottom side plate 131 and the battery cell 2. Among them, the second section 402 of the first pin 41 and the bottom side plate 131, and the second section 402 of the second pin 42 and the bottom side plate 131 are both provided with a thermally conductive insulating plate 5.

[0101] Among them, the material of the thermally conductive insulating plate 5 can be selected according to actual needs, for example, in some embodiments, the thermally conductive insulating plate 5 can be a thermally conductive insulating ceramic plate, which has high insulation strength and can ensure its stability and safety under high pressure and high temperature conditions. It can be used to isolate and protect electronic components, prevent current leakage and short circuit. In addition, the thermally conductive insulating ceramic plate has high thermal conductivity and temperature resistance, on the one hand, it can effectively conduct and dissipate heat. On the other hand, it can work for a long time in a high temperature environment, and has higher stability. For example, in some embodiments, the thermally conductive insulating plate 5 can also be made of high-thermal-conductivity epoxy resin, high-thermal-conductivity silicone rubber, high-thermal-conductivity silicone grease, etc. The application does not make specific limitations.

[0102] During battery 10 operation, the heat transferred from cell 2 to first pin 41, as well as the heat generated by the ohmic effect at first pin 41, can be transferred from the first segment 401 of first pin 41 to the second segment 402 of first pin 41. Since the thermally conductive insulating plate 5 is disposed between the second segment 402 of first pin 41 and the bottom side plate 131, the heat transferred to the second segment 402 of first pin 41 can be transferred along the temperature gradient direction to the thermally conductive insulating plate 5, and then to the bottom side plate 131. The bottom side plate 131 can be kept separate from the external environment and... Figure 2 The liquid cooling plate 20 shown performs heat exchange. The external environment and the liquid cooling plate 20 can remove the heat from the bottom side plate 131, so that there is always a temperature difference between the bottom side plate 131 and the thermally conductive insulating plate 5. Similarly, there is always a temperature difference between the thermally conductive insulating plate 5 and the second segment 402 of the first pin 41. In this way, the heat of the first pin 41 can be continuously transferred to the outside of the battery 10.

[0103] Similarly, the heat transferred from cell 2 to the second pin 42, as well as the heat generated by the second pin 42 due to ohmic efficiency, can be transferred from the first segment 401 of the second pin 42 to the second segment 402 of the second pin 42. Since the thermally conductive insulating plate 5 is in contact with both the second segment 402 of the second pin 42 and the bottom side plate 131, the heat transferred to the second segment 402 of the second pin 42 can be transferred along the temperature gradient direction to the thermally conductive insulating plate 5, and then to the bottom side plate 131. The bottom side plate 131 can be kept in contact with the external environment and... Figure 4 The liquid cooling plate 20 shown performs heat exchange. The external environment and the liquid cooling plate 20 can remove the heat from the bottom side plate 131, so that there is always a temperature difference between the bottom side plate 131 and the thermally conductive insulating plate 5. Similarly, there is always a temperature difference between the thermally conductive insulating plate 5 and the second segment 402 of the second pin 42. In this way, the heat of the second pin 42 can be continuously transferred to the outside of the battery 10.

[0104] This configuration establishes a heat conduction path between the battery cell 2 and the bottom side plate 131. Furthermore, since the liquid cooling plate 20 can exchange heat with the bottom side plate 131, establishing this heat conduction path further improves the heat dissipation efficiency inside the battery 10, resulting in a more balanced internal temperature and mitigating any temperature imbalances within the battery 10.

[0105] In one embodiment, the thermally conductive insulating plate 5 contacts the second segment 402 of the first pin 41, the second segment 402 of the second pin 42, and the bottom side plate 131, respectively, to improve the heat exchange efficiency between the thermally conductive insulating plate 5 and the second segment 402 of the first pin 41, and to improve the heat exchange efficiency between the thermally conductive insulating plate 5 and the second segment 402 of the second pin 42 and the bottom side plate 131.

[0106] existFigure 4 In the embodiment shown, the positive electrode tab 21 and the negative electrode tab 22 of the battery cell 2 are located on opposite sides of the battery cell 2. The heat of the positive electrode tab 21 can be transmitted to the bottom side plate 131 through the first pin 41. The heat of the negative electrode tab 22 can be transmitted to the bottom side plate 131 through the second pin 42. Such a setting mode can further increase the heat dissipation path of the battery cell 2 to the outside of the battery, so as to further improve the heat dissipation efficiency of the battery cell 2 and improve the temperature imbalance inside the battery cell 2, thereby being beneficial to further improving the temperature imbalance inside the battery 10.

[0107] In some embodiments, the first pin 41 is an integrally formed structure, which can facilitate the processing, manufacturing and assembly of the first pin 41, reduce production cost and assembly process. In addition, the first pin 41 is an integrally formed structure, which can be more beneficial to heat transmission, thereby ensuring the heat dissipation efficiency of the heat conduction link between the first pin 41 and the bottom side plate 131.

[0108] In some embodiments, the second pin 42 is an integrally formed structure, which can facilitate the processing, manufacturing and assembly of the second pin 42, reduce production cost and assembly process. In addition, the second pin 42 is an integrally formed structure, which can be more beneficial to heat transmission, thereby ensuring the heat dissipation efficiency of the heat conduction link between the second pin 42 and the bottom side plate 131.

[0109] In Figure 5 In the embodiment shown, the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 are located on the same side of the battery cell 2. The second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 are both located between the bottom side plate 131 and the battery cell 2. On the one hand, heat exchange can be performed between the liquid cooling plate 20 and the bottom side plate 131 to achieve concentrated heat dissipation of the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42. Compared with the setting mode in which the liquid cooling plate 20 is arranged on the plurality of side plates 13 of the shell 1, concentrated heat dissipation can reduce the occupied space of the liquid cooling plate 20 while ensuring the same heat dissipation effect. On the other hand, the size of the battery 10 can be reduced, thereby reducing the occupied space of the battery 10 and being beneficial to the miniaturization design of the battery 10.

[0110] In other embodiments, the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 can also be located on different sides of the battery cell 2. A heat-conducting insulation plate 5 is arranged between the second segment 402 of the first pin 41 and the corresponding side plate 13. A heat-conducting insulation plate 5 is also arranged between the second segment 402 of the second pin 42 and the corresponding side plate 13. The two heat-conducting insulation plates 5 are located on different sides of the battery cell 2. The present application does not make specific limitations thereon, and those skilled in the art can selectively design according to the needs.

[0111] Below, the application will be exemplarily introduced only by taking the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 located on the same side of the battery cell 2 as an example.

[0112] Figure 3B A second exploded view of a battery is shown. Referring to Figure 5 and Figure 5 , the battery 10 further comprises a first insulating plate 61, the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 are located between the first insulating plate 61 and the battery cell 2, and the first insulating plate 61 is in contact with the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 of the battery cell 2 respectively. Through the first insulating plate 61, the battery cell 2 and the second segment 402 of the first pin 41 can be electrically isolated, preventing the battery cell 2 and the second segment 402 of the first pin 41 from being electrically connected to cause internal short circuit of the battery 10, and ensuring safe operation of the battery 10. Similarly, through the first insulating plate, the battery cell 2 and the second segment 402 of the second pin 42 can be electrically isolated, preventing the battery cell 2 and the second segment 402 of the second pin 42 from being electrically connected to cause internal short circuit of the battery 10, and ensuring safe operation of the battery.

[0113] In addition, the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 are located between the first insulating plate 61 and the battery cell 2, compared with the case that an insulating plate is respectively arranged between the second segment 402 of the first pin 41 and the battery cell 2 and between the second segment 402 of the second pin 42 and the battery cell 2, the number of parts of the battery 10 can be reduced, and the assembly process and difficulty of the battery 10 can be reduced.

[0114] In some examples, the battery cell 2 can be mounted on the first insulating plate 61. In this case, the first insulating plate 61 can also be used as a tray for the battery cell 2 to support, protect and insulate the battery cell 2.

[0115] In some embodiments, the thermal conductivity of the heat-conducting insulating plate 5 is greater than the thermal conductivity of the first insulating plate 61. Therefore, the heat of the first insulating plate 61 and the heat of the pin tend to be transmitted to the heat-conducting insulating plate 5, and then transmitted to the bottom plate 131 through the heat-conducting insulating plate 5, so as to improve the heat dissipation efficiency of the battery 10, further improve the temperature imbalance inside the battery 10, and ensure the operation reliability of the battery 10. In addition, it can also prevent the heat from being transmitted to the battery cell 2 to cause local temperature rise of the battery cell 2, and ensure the safe operation of the battery cell 2.

[0116] Referring to Figure 6 , the shell 1 contains two battery cells 2, and the positive electrode tabs 21 of the two battery cells 2 are electrically connected to the positive electrode posts 31 through the first pins 41. The negative electrode tabs 22 of the two battery cells 2 are electrically connected to the negative electrode posts 32 through the second pins 42.

[0117] The electric cell 2 can be made in any suitable manner, for example, in some embodiments, the electric cell is made by a stacking process. In other embodiments, the electric cell is made by a winding process. The working principle, structure, process method, etc. of the electric cell made by the stacking process and the electric cell made by the winding process are well known to those skilled in the art, and will not be described here.

[0118] In other embodiments of the present application, the number of electric cells 2 accommodated in the housing 1 can be various, for example, the housing 1 accommodates one electric cell 2, or the housing 1 accommodates three or more electric cells, and the number of electric cells in the housing 1 is not specifically limited by the present application.

[0119] Figure 6 A partial structural schematic diagram of a battery is shown. Referring to Figure 6A The second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 are spaced apart. The distance between the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 should meet the safety specification and standard requirements (such as electrical clearance, creepage distance, etc.) to prevent short circuiting due to the small distance between the first pin 41 and the second pin 42.

[0120] In order to further electrically isolate the first pin 41 and the second pin 42, the first insulating plate 61 is provided with a protrusion 611 facing away from the surface of the electric cell 2, and the protrusion 611 is located between the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42, so as to separate the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 by the protrusion 611, prevent short circuiting between the first pin 41 and the second pin 42 due to displacement of the first pin 41 and the second pin 42 in the battery, and ensure safe operation of the battery.

[0121] In some embodiments, the protrusion 611 can have a dimension in the Y direction that is greater than the safety distance between the second segment 402 of the first pin 41 and the second segment 402 of the second pin 42 (i.e., the distance that meets the safety specification and standard requirements such as electrical clearance, creepage distance, etc.).

[0122] Figure 6A A partial structural schematic diagram of a battery is shown. Referring to Figure 6A The minimum distance between the first insulating plate 61 and the first segment 401 of the first pin 41 is d1, and the distance between the positive tab 21 and the first segment 401 of the first pin 41 is d2, d1 < d2. The minimum distance between the first insulating plate 61 and the first segment 401 of the first pin 41 can be understood as the end face of the first insulating plate 61 closest to the first segment 401 of the first pin 41 (such as the end face of the protrusion 611 closest to the first segment 401 of the first pin 41), and the distance between the positive tab 21 and the first segment 401 of the first pin 41 can be understood as the distance between the end face of the positive tab 21 closest to the first segment 401 of the first pin 41 and the first segment 401 of the first pin 41. Figure 6BThe distance between the end face of the first insulating plate 61 closest to the first segment 401 of the second lead 42 (as shown in the B face of FIG. 6) and the first segment 401 of the second lead 42. Since d3

[0123] In addition, since the positive tab 21 is arranged at the side of the battery cell 2 closest to the first cover plate 11, the distance d1 between the first insulating plate 61 and the first segment 401 of the first lead 41 is smaller than the distance d2 between the positive tab 21 and the first segment 401 of the first lead 41, which can make the end of the tab of the battery cell 2 be arranged apart from the first segment 401 of the first lead 41, so as to prevent the first segment 401 of the first lead 41 from contacting the tab of the battery cell 2 to cause internal short circuit of the battery 10, and ensure the insulation between the battery cell 2 and the first lead 41.

[0124] Figure 6B A partial structure diagram of a battery is shown in FIG. 6. Referring to FIG. 6, Figure 6B The minimum distance between the first insulating plate 61 and the first segment 401 of the second lead 42 is d3, and the distance between the negative tab 22 and the first segment 401 of the second lead 42 is d4, d3 Figure 7 The distance between the end face of the first insulating plate 61 closest to the first segment 401 of the second lead 42 (as shown in the B face of FIG. 6) and the first segment 401 of the second lead 42. Since d3

[0125] In addition, since the negative tab 22 is arranged at the side of the battery cell 2 closest to the second cover plate 12, the minimum distance d3 between the first insulating plate 61 and the first segment 401 of the second lead 42 is smaller than the distance d4 between the negative tab 22 and the first segment 401 of the second lead 42, which can make the end of the tab of the battery cell 2 be arranged apart from the first segment 401 of the second lead 42, so as to prevent the first segment 401 of the second lead 42 from contacting the tab of the battery cell 2 to cause internal short circuit of the battery 10, and ensure the insulation between the battery cell 2 and the second lead 42.

[0126] Figure 3B An exploded view of a battery is shown in FIG. 6. Referring to FIG. 6, Figure 7 and Figure 3BThe second insulating plate 62 is in contact with the first section 401 of the first pin 41 and the first cover plate 11. Through the second insulating plate 62, the first cover plate 11 and the first section 401 of the first pin 41 can be electrically isolated, preventing the first cover plate 11 and the first section 401 of the first pin 41 from being electrically connected to cause internal short circuit of the battery 10, ensuring safe operation of the battery 10.

[0127] With reference to Figure 7 and Figure 3B , one end of the thermally conductive insulating plate 5 facing the first cover plate 11 is in contact with the second insulating plate 62. Since the thermally conductive insulating plate 5 is located between the second section 402 of the first pin 41 and the bottom side plate 131, and the second insulating plate 62 is located between the first section 401 of the first pin 41 and the first cover plate 11, by making one end of the thermally conductive insulating plate 5 facing the first cover plate 11 in contact with the second insulating plate 62, insulation between the second section 402 of the first pin 41 and the first cover plate 11 can be ensured, and insulation between the first section 401 of the first pin 41 and the bottom side plate 131 can be ensured, further ensuring safe operation of the battery 10.

[0128] The third insulating plate 63 is in contact with the first section 401 of the second pin 42 and the second cover plate 12. Through the third insulating plate 63, the second cover plate 12 and the first section 401 of the second pin 42 can be electrically isolated, preventing the second cover plate 12 and the first section 401 of the second pin 42 from being electrically connected to cause internal short circuit of the battery 10, ensuring safe operation of the battery 10.

[0129] With reference to Figure 7 and Figure 8 , one end of the thermally conductive insulating plate 5 facing the second cover plate 12 is in contact with the third insulating plate 63.

[0130] Since the thermally conductive insulating plate 5 is located between the second section 402 of the second pin 42 and the bottom side plate 131, and the third insulating plate 63 is located between the first section 401 of the second pin 42 and the second cover plate 12, by making one end of the thermally conductive insulating plate 5 facing the second cover plate 12 in contact with the third insulating plate 63, insulation between the second section 402 of the second pin 42 and the second cover plate 12 can be ensured, and insulation between the first section 401 of the second pin 42 and the bottom side plate 131 can be ensured, further ensuring safe operation of the battery 10.

[0131] In some embodiments, the thermal conductivity of the thermal insulation plate 5 is greater than the thermal conductivity of the second insulation plate 62. Since the positive pole is located on the first cover plate 11 for connecting external devices, by making the thermal conductivity of the thermal insulation plate 5 greater than the thermal conductivity of the second insulation plate 62, the heat transmitted to the first pin 41 is more inclined to be transmitted to the thermal insulation plate 5, and then transmitted to the bottom plate 131 through the thermal insulation plate 5, which can prevent the heat from concentrating at the positive pole and affecting the electrical connection between the positive pole and the external device, on the one hand, and can transmit the heat of the first pin 41 to the liquid cooling plate 20 of the battery 10 through the thermal insulation plate 5 as much as possible, on the other hand, so as to improve the heat dissipation efficiency of the battery 10 and further improve the temperature imbalance inside the battery 10, thereby ensuring the operation reliability of the battery 10.

[0132] In some embodiments, the thermal conductivity of the thermal insulation plate 5 is greater than the thermal conductivity of the third insulation plate 63. The thermal conductivity of the thermal insulation plate 5 is greater than the thermal conductivity of the third insulation plate 63. Since the negative pole is located on the second cover plate 12 for connecting external devices, by making the thermal conductivity of the thermal insulation plate 5 greater than the thermal conductivity of the third insulation plate 63, the heat transmitted to the second pin 42 is more inclined to be transmitted to the thermal insulation plate 5, and then transmitted to the bottom plate 131 through the thermal insulation plate 5, which can prevent the heat from concentrating at the negative pole and affecting the electrical connection between the negative pole and the external device, on the one hand, and can transmit the heat of the second pin 42 to the liquid cooling plate 20 of the battery 10 through the thermal insulation plate 5 as much as possible, on the other hand, so as to improve the heat dissipation efficiency of the battery 10 and further improve the temperature imbalance inside the battery 10, thereby ensuring the operation reliability of the battery 10.

[0133] Figure 8 A structural schematic diagram of a battery cell is shown. Referring to Figure 9 The positive tab 21 includes a plurality of positive tabs 71 extending from the battery cell 2, and the plurality of positive tabs 71 converge to form a full tab. The negative tab 22 includes a plurality of negative tabs 72 extending from the battery cell 2, and the plurality of negative tabs 72 converge to form a full tab.

[0134] It can be understood that the positive tab 21 and the negative tab 22 of the battery cell 2 are both full tabs. The full tab is also called a no-tab. Compared with a single tab, through the positive tab 21 and the negative tab 22 of the full tab, the current conduction area of the positive tab 21 and the negative tab 22 can be increased, and the current transmission distance can be shortened, so that the current distribution inside the battery cell 2 can be more balanced, and the problem of current imbalance inside the battery cell 2 is improved. Moreover, the internal resistance of the battery 10 can be greatly reduced, the heat generation amount can be reduced, and the service life of the battery 10 can be prolonged.

[0135] Wherein, the structure of the full tab, and the working principle, process of the multiple tabs gathering to form the full tab are well known to those skilled in the art, and will not be repeated here.

[0136] Figure 9 Another structural schematic diagram of the battery cell is shown. Referring to ​ The positive tab 21 includes multiple, each of which is electrically connected to the first pin 41, such as welding, and adjacent two positive tabs 21 are arranged at intervals. The negative tab 22 includes multiple, each of which is electrically connected to the second pin 42, such as welding, and adjacent two negative tabs 22 are arranged at intervals.

[0137] It can be understood that the positive tab 21 and the negative tab 22 of the battery cell 2 are both multiple tabs. Compared with single tab, the number of the positive tab 21 and the negative tab 22 of the multiple tab is increased, so as to significantly improve the current capacity of the battery 10 and the power output of the battery 10. Moreover, the multiple positive tabs 21 and the multiple negative tabs 22 can also make the current distribution inside the battery 10 more uniform, improve the problem of current imbalance inside the battery cell 2, and reduce local overheating and potential safety risks.

[0138] Wherein, the structure of the multiple tab, and the working principle, process of the multiple tab and the pin connection are well known to those skilled in the art, and will not be repeated here.

[0139] In the above embodiments of the present application, the materials of the first insulating plate 61, the second insulating plate 62 and the third insulating plate 63 can be various, for example, in some embodiments, the first insulating plate 61, the second insulating plate 62 and the third insulating plate 63 can be made of polypropylene (Polypropylene) material, and the present application does not make specific limitation, and those skilled in the art can selectively design according to actual needs.

[0140] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery, characterized by, The battery comprises a cover plate, a plurality of side plates, a battery cell and a pin, the cover plate is perpendicular to the plurality of side plates, the plurality of side plates and the cover plate enclose a receiving cavity, the battery cell is located in the receiving cavity, the cover plate is provided with a pole, the battery cell is provided with a tab, the pin comprises a first segment and a second segment connected with each other, the first segment is used for electrically connecting the tab and the pole, the first segment is located between the tab of the battery cell and the cover plate, the second segment is located between the battery cell and one of the plurality of side plates, and a thermally conductive insulating plate is arranged between the second segment and the one of the plurality of side plates.

2. The battery of claim 1, wherein, The tab comprises a positive tab and a negative tab, the pole comprises a positive pole and a negative pole, the pin comprises a first pin and a second pin, the first segment of the first pin is electrically connected with the positive tab and the positive pole, and the first segment of the second pin is electrically connected with the negative tab and the negative pole. The positive tab and the negative tab are located on opposite sides of the battery cell respectively, and the second segment of the first pin and the second segment of the second pin are located on the same side of the battery cell.

3. The battery of claim 2, wherein, The battery further comprises a first insulating plate, the second segment of the first pin and the second segment of the second pin are located between the first insulating plate and the battery cell, and the first insulating plate is in contact with the battery cell, the second segment of the first pin and the second segment of the second pin respectively.

4. The battery of claim 3, wherein, The thermal conductivity of the thermally conductive insulating plate is greater than that of the first insulating plate.

5. The battery according to claim 3 or 4, characterized in that, The second segment of the first pin and the second segment of the second pin are arranged at intervals. A protrusion is arranged on the surface of the first insulating plate away from the battery cell, and the protrusion is located between the second segment of the first pin and the second segment of the second pin.

6. The battery of any one of claims 3-5, wherein, The distance between the first insulating plate and the first segment of the first pin is less than the minimum distance between the positive tab and the first segment of the first pin; and / or, The minimum distance between the first insulating plate and the first segment of the second pin is less than the distance between the negative tab and the first segment of the second pin.

7. The battery of any one of claims 2-6, wherein, The cover plate comprises a first cover plate, and the positive pole is arranged on the first cover plate. A second insulating plate is arranged between the first segment of the first pin and the first cover plate, and the second insulating plate is in contact with the first segment of the first pin and the first cover plate respectively. The thermal conductivity of the thermally conductive insulating plate is greater than that of the second insulating plate.

8. The battery of claim 7, wherein, One end of the thermally conductive insulating plate towards the first cover plate is in contact with the second insulating plate.

9. The battery of any one of claims 2-8, wherein, The cover plate comprises a second cover plate, and the negative pole is arranged on the second cover plate. A third insulating plate is arranged between the first segment of the second pin and the second cover plate, and the third insulating plate is in contact with the first segment of the second pin and the second cover plate respectively. The thermal conductivity of the thermally conductive insulating plate is greater than that of the third insulating plate.

10. The battery of claim 9, wherein, One end of the thermally conductive insulating plate towards the second cover plate is in contact with the third insulating plate.

11. The battery of any one of claims 2-10, wherein, The positive tab comprises a plurality of positive pole pieces extending from the battery cell, and the plurality of positive pole pieces are gathered to form a full tab. The negative tab includes a plurality of negative tab pieces extending from the battery cell, and the plurality of negative tab pieces are gathered to form a full tab.

12. The battery of any one of claims 2-10, wherein, The positive tab includes a plurality of positive tabs, each of which is electrically connected to the first lead pin, and adjacent two of the positive tabs are arranged at intervals. The negative tab includes a plurality of negative tabs, each of which is electrically connected to the second lead pin, and adjacent two of the negative tabs are arranged at intervals.

13. The battery of any one of claims 1-12, wherein, The lead pin is an integrally formed structural member.

14. A battery pack, characterized by The battery includes a liquid cooling plate and the battery as claimed in any one of claims 1-13, the thermally conductive insulating plate is arranged between the one side plate and the battery cell, and the liquid cooling plate is arranged on the side of the one side plate away from the battery cell.

15. An energy storage system characterized by, The energy storage system includes the battery pack as claimed in claim 14 and a power converter, and the power converter is used to perform power conversion on the voltage output by the battery pack.

Images