A battery pack and an electric device

Abstract

The utility model belongs to new energy battery technical field discloses a kind of battery pack and electrical equipment, battery pack includes: box, the cover plate being connected with box and covering opening, cover plate and box form containing cavity;Multiple batteries, be located in containing cavity, all include shell and the pole that passes the shell, and pole is located at the side of shell;Insulating plate, including first heat exchange part, first joint and second joint;First heat exchange part includes first heat exchange layer and first sealing layer, first heat exchange layer is connected battery, first sealing layer is set at the side of first heat exchange layer deviating battery, first heat exchange layer and first sealing layer form closed first heat exchange flow channel;First joint, second joint communicate first heat exchange flow channel;First heat exchange layer is equipped with first through-hole, first sealing layer is equipped with second through-hole, pole passes first through-hole and second through-hole. Significantly improve the heat exchange capacity and heat dissipation capacity of battery pole nearby area.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, specifically to a battery pack and electrical equipment. Background Technology

[0002] Power battery packs typically consist of multiple batteries and are equipped with independent cooling systems to handle the enormous heat generated during charging and discharging. The cooling capacity of the battery pack has become a major factor limiting its charging and discharging power.

[0003] The battery terminals are one of the main heat-generating parts. However, traditional air-cooling solutions have limited cooling power, and liquid-cooling solutions can only cool flat surfaces, such as between batteries or on the top or bottom plate of the battery pack. Neither of these solutions can provide sufficient cooling power to the terminals. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and electrical equipment to solve the problem of poor heat dissipation in the battery terminal area.

[0005] In a first aspect, this utility model provides a battery pack having a vertical first direction and a third direction, comprising: a housing having an opening; a cover plate connected to the housing and covering the opening, the cover plate and the housing forming a receiving cavity; a plurality of batteries disposed within the receiving cavity, the plurality of batteries being arranged along the first direction, each battery including a housing and an electrode post penetrating the housing, the electrode post being located on one side of the housing in the third direction; and a separator plate including a first heat exchange section, a first connector, and a second connector; the first heat exchange section including a first heat exchange layer and a first sealing layer, the first heat exchange layer... The battery is connected to the side of the third direction where the electrode post is provided. The first sealing layer is provided on the side of the first heat exchange layer opposite to the battery. The first heat exchange layer and the first sealing layer enclose and form a sealed first heat exchange channel. The first connector is connected to the first heat exchange part and communicates with the first heat exchange channel. The second connector is connected to the first heat exchange part and communicates with the first heat exchange channel. The first heat exchange layer has a first through hole, and the first sealing layer has a second through hole. The first through hole and the second through hole are correspondingly arranged along the third direction. The electrode post passes through the first through hole and the second through hole.

[0006] According to the above technical means, by designing a hollow separator plate to surround the battery terminals, the hollow space of the separator plate can be filled with a heat exchange medium. The heat exchange medium absorbs the heat emitted by the battery terminals by means of its heat absorption capacity. In addition, the separator plate prevents the battery terminals from being covered by the first and second through holes, maintaining its air permeability and significantly improving the heat dissipation capacity of the area near the battery terminals.

[0007] In some alternative embodiments, the battery pack further includes a first busbar disposed on the side of the first sealing layer opposite to the first heat exchange layer, with one end of the first busbar connected to the terminal post and the other end of the first busbar connected to the terminal post of the battery adjacent to the first direction, having the opposite polarity to the terminal post connected to both ends of the first busbar.

[0008] According to the above technical means, the positions of the first through hole and the second through hole can be connected together by setting the first busbar to connect the terminals of different batteries, thereby realizing the series and parallel connection effect of multiple batteries, and also facilitating the realization of functions such as temperature sampling and voltage sampling.

[0009] In some alternative embodiments, the housing is provided with a pressure relief hole that penetrates the housing and is located at a position corresponding to the first heat exchange channel position of the housing; the battery also includes a pressure relief valve that is connected to and covers the pressure relief hole.

[0010] Based on the above technical means, the first heat exchange channel of the isolation plate is designed to be positioned directly opposite the pressure relief hole of the battery casing. This allows the isolation plate to melt when the battery catches fire and causes high-temperature compounds to be ejected from the pressure relief hole, so that the heat exchange medium in the isolation plate can flow onto the burning battery, achieving a rapid fire extinguishing effect.

[0011] In some alternative embodiments, the battery pack further includes a heat exchange medium that fills the first heat exchange channel; the heat exchange medium is a liquid medium with an electrical conductivity of not more than 5.0 mS / cm.

[0012] Based on the above technical means, the heat exchange medium adopts a liquid medium with an electrical conductivity of no more than 5.0 mS / cm. The low electrical conductivity of the heat exchange medium can avoid the problem of short circuits in the batteries when the heat exchange medium flows between different batteries.

[0013] In some alternative embodiments, a second direction is also included, wherein the second direction, the first direction, and the third direction are perpendicular to each other, and a plurality of the batteries are arranged in the first direction to form multiple rows, and the multiple rows of batteries are arranged in the second direction; the battery pack also includes a plurality of first partitions, wherein the first partitions are disposed between two adjacent batteries in the first direction.

[0014] According to the above-mentioned technical means, the batteries in the box are separated by the first partition, which can effectively prevent the leakage of electrolyte inside the battery pack and the leakage of gas generated during charging and discharging to a certain extent.

[0015] In some alternative embodiments, the first separator includes a separator body and a boss disposed on the edge of the separator body on the side opposite to the battery.

[0016] According to the above-mentioned technical means, the battery will expand during operation, with more expansion at the center of the larger side of the battery. The groove formed by the protrusion can accommodate the expanded part and play a buffering role.

[0017] In some alternative embodiments, the partition body is made of thermal insulation material.

[0018] Based on the above technical means, when a battery experiences thermal runaway, the thermal insulation material can slow down the transfer of heat, preventing the thermal runaway of one battery from quickly spreading and affecting the thermal runaway of the entire battery pack, thereby improving the safety of the battery pack.

[0019] In some optional embodiments, the battery pack further includes a heat exchange plate, the electrode post being disposed on one side of the housing in the third direction, and the heat exchange plate being disposed on the other side of the housing in the third direction; the heat exchange plate includes a second heat exchange portion, a third connector, and a fourth connector; the second heat exchange portion includes a second heat exchange layer connected to the battery, and a second sealing layer disposed on the side of the second heat exchange layer opposite to the battery, the second heat exchange layer and the second sealing layer enclosing to form a sealed second heat exchange channel; the third connector is connected to the second heat exchange portion and communicates with the second heat exchange channel, and the fourth connector is connected to the second heat exchange portion and communicates with the second heat exchange channel.

[0020] Based on the above-mentioned technical means, a liquid-cooled heat exchange plate is also provided on the opposite side of the battery terminal to dissipate heat from the battery, thereby further improving the heat dissipation capacity of the battery pack.

[0021] In some alternative embodiments, the first connector, the second connector, the third connector, and the fourth connector are all disposed on the same side of the plurality of batteries in the first direction; or, the first connector, the second connector, the third connector, and the fourth connector are all disposed on the same side of the plurality of batteries in the second direction.

[0022] Based on the above technical means, the first connector, the second connector, the third connector and the fourth connector are all set on the same side of the battery pack. The liquid medium can be injected and flowed out from the same side, which optimizes the layout of the liquid medium pipeline and improves the heat exchange efficiency between the liquid medium and the battery.

[0023] Secondly, this utility model provides an electrical device, including the battery pack provided in any of the first aspects. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the internal components of the battery pack housing according to an embodiment of the present utility model;

[0027] Figure 3 This is an exploded view of the internal components of the battery pack housing according to an embodiment of the present utility model;

[0028] Figure 4 This is a partially enlarged schematic diagram of the isolation plate according to an embodiment of the present utility model;

[0029] Figure 5 This is an exploded view of the isolation plate according to an embodiment of the present utility model;

[0030] Figure 6 This is a partial enlarged view of the first heat exchange layer according to an embodiment of the present utility model;

[0031] Figure 7 This is a partial enlarged view of the first sealing layer according to an embodiment of the present utility model;

[0032] Figure 8 This is a partial enlarged view of a battery according to an embodiment of the present utility model;

[0033] Figure 9 This is a partial enlarged view of the first partition according to an embodiment of the present utility model;

[0034] Figure 10 This is a schematic diagram of the structure of the heat exchange plate according to an embodiment of the present utility model;

[0035] Figure 11 This is a partially enlarged view of the heat exchange plate according to an embodiment of the present utility model;

[0036] Figure 12 This is a structural block diagram of the battery pack cooling circulation loop according to an embodiment of the present utility model;

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Housing; 2. Cover plate; 3. Receiving cavity; 4. Battery; 4a. Outer shell; 4b. Terminal post; 5. Isolation plate; 5a. First heat exchange section; 5b. First connector; 5c. Second connector; 5d. First heat exchange layer; 5e. First sealing layer; 5f. First heat exchange channel; 5g. First through hole; 5h. Isolation plate through hole; 6. First manifold; 7. Second manifold; 8. Pressure relief valve; 9. First partition; 10. Partition body; 10a. Boss; 10b. Second partition; 11. Heat exchange plate; 12. Second heat exchange section; 12a. Third connector; 12b. Fourth connector; 12c. Second heat exchange layer; 12d. Second sealing layer; 12e. Second heat exchange channel; 12f. Water pump; 13. Expansion tank; 14. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also mean including the plural forms. The terms “comprising,” “including,” and “having” are inclusive and therefore indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0041] Although terms such as "first," "second," etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Furthermore, in the description of this application, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] For ease of description, spatial relative terms can be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "end," "length," "inner," and "outer." Such spatial relative terms are intended to include different orientations of the mechanism in use or operation, in addition to those depicted in the figure.

[0043] According to an embodiment of the present invention, a battery pack is provided, such as... Figure 1 As shown, the battery pack has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other, including:

[0044] Box 1 has an opening;

[0045] The cover plate 2 is connected to the box body 1 and covers the opening. The cover plate 2 and the box body 1 enclose and form a receiving cavity 3.

[0046] Multiple batteries 4 are disposed in the receiving cavity 3. The multiple batteries 4 are arranged along the first direction X. Each battery 4 includes a housing 4a and an electrode post 4b passing through the housing 4a. The electrode post 4b is located on the side of the housing 4a in the third direction Z.

[0047] The isolation plate 5 includes a first heat exchange section 5a, a first connector 5b, and a second connector 5c. The first heat exchange section 5a includes a first heat exchange layer 5d and a first sealing layer 5e. The first heat exchange layer 5d is connected to the side of the battery 4 in the third direction Z where the electrode post 4b is provided. The first sealing layer 5e is provided on the side of the first heat exchange layer 5d away from the battery 4. The first heat exchange layer 5d and the first sealing layer 5e enclose and form a sealed first heat exchange channel 5f. The first connector 5b is connected to the first heat exchange section 5a and communicates with the first heat exchange channel 5f. The second connector 5c is connected to the first heat exchange section 5a and communicates with the first heat exchange channel 5f. The first heat exchange layer 5d is provided with a first through hole 5g, and the first sealing layer 5e is provided with a second through hole 5h. The first through hole 5g and the second through hole 5h are provided correspondingly along the third direction Z. The electrode post 4b passes through the first through hole 5g and the second through hole 5h.

[0048] Specifically, such as Figure 1 As shown, in this embodiment of the utility model, multiple batteries 4 are placed in the receiving cavity 3 formed by the box body 1 and the cover plate 2.

[0049] It should be noted that the introduction of the first direction X, the second direction Y, and the third direction Z in the various embodiments of this application is merely for the convenience of describing spatial positional relationships and should not be construed as limiting the scope of the embodiments of this application. Therefore, the pairwise perpendicular relationship of the first direction X, the second direction Y, and the third direction Z can be interpreted, depending on the actual technical scenario, as the first direction X, the second direction Y, and the third direction Z respectively representing three mutually perpendicular directions in three-dimensional space, or it can be reasonably interpreted as a nearly perpendicular relationship between the first direction X, the second direction Y, and the third direction Z, for example, the included angles between the first direction X, the second direction Y, and the third direction Z are all within the range of 85°-95°... As long as the technical solution can conform to the spirit of this application or achieve the technical effect described in this application, it can be considered to fall within the scope defined by the appended claims.

[0050] like Figure 2 and Figure 3 As shown, in some optional embodiments, the battery 4 may be a square aluminum-cased battery, including a wide side along the first direction X and a long side along the second direction Y, with the terminal post 4b disposed on the same side of the third direction Z, and the battery also arranged along the second direction Y; or the battery 4 may be a cylindrical battery, with the casing 4a as the negative electrode and the terminal post 4b as the positive electrode, disposed along the third direction Z, and arranged in a hexagonal close arrangement on a plane perpendicular to the third direction Z; or the battery 4 may be a blade battery, arranged along the first direction X, with terminal posts 4b of opposite polarity disposed at both ends of the third direction Z. This utility model is only an example and is not limited thereto.

[0051] In addition, such as Figure 4 As shown, the first heat exchange part 5a provided in this embodiment of the present invention adopts a hollow design. By enclosing the edges of the first heat exchange layer 5d and the first sealing layer 5e, a first heat exchange channel 5f is formed in the space between the first heat exchange layer 5d and the first sealing layer 5e. This hollow component is the first heat exchange part 5a.

[0052] Then, a first connector 5b and a second connector 5c are reserved at the edge of the isolation plate 5. The first connector 5b and the second connector 5c are respectively used to connect with the first heat exchange channel 5f.

[0053] Based on the hollow design of the first heat exchange section 5a, the user can use a water pump to connect water pipes to the first connector 5b and the second connector 5c to form a circulation loop for the heat exchange medium. For example, water flows in from the first connector 5b and out from the second connector 5c, or water flows in from the second connector 5c and out from the first connector 5b, so that the first heat exchange channel 5f in the isolation plate 5 can circulate the flow of the heat exchange medium.

[0054] In some optional embodiments, a heating wire can be installed in the circulation loop consisting of the water pump, water pipe, first connector 5b, first heat exchange channel 5f, and second connector 5c to heat the heat exchange medium. Heat is then conducted around the battery terminal 4b via the insulating plate 5, controlling the temperature of the battery 4 and ensuring it remains within its usable range. For example, when the ambient temperature is very low, causing the battery 4 to become too cold, a signal from the battery management system is triggered, causing the heat exchange medium in the circulation loop to circulate, activating the heating wire, and raising the temperature of the heat exchange medium to heat the battery 4. Conversely, when the battery 4 temperature is too high, the heating wire does not need to operate; instead, a signal from the battery management system is triggered, causing the heat exchange medium in the circulation loop to circulate and remove heat from the battery, thus cooling it down.

[0055] In some optional embodiments, the thickness of the first heat exchange layer 5d and the first sealing layer 5e is as thin as possible, and can be set between 0.3mm and 0.8mm, for example, 0.5mm, to ensure that the heat exchange medium in the separator 5 is closer to the battery terminal 4b, facilitating the absorption of heat dissipated from the area near the battery terminal 4b. Additionally, in some optional embodiments, the cavity height of the first heat exchange channel 5f is not too high, and can be set between 1.5mm and 3mm, for example, 2mm, to ensure that the height of the separator 5 is as low as possible, reducing the space occupied by the battery pack in the third direction Z, improving the space utilization rate of the equipment used to install the battery pack, and reducing the production cost of the battery pack.

[0056] In addition, such as Figure 3 As shown, a partition plate through hole 6 is provided on the first heat exchange section 5a. The partition plate through hole 6 is used to pass through the battery terminal 4b and exactly surround the battery terminal 4b. Figure 3 The isolation plate 5 shown is divided into two parts, one above the other. Figure 5 , Figure 6 and Figure 7 As shown, specifically, a first through hole 5g corresponding to the position of the electrode post 4b is provided on the first heat exchange layer 5d, and a second through hole 5h corresponding to the position of the electrode post 4b is provided on the first sealing layer 5e. Since both the first through hole 5g and the second through hole 5h correspond to the position of the electrode post 4b, when the first heat exchange layer 5d and the first sealing layer 5e are joined together, the first through hole 5g and the second through hole 5h can be aligned at their edges, thereby forming the isolation plate through hole 6 on the first heat exchange part 5a. This through hole passes through the battery electrode post 4b and surrounds the battery electrode post 4b.

[0057] According to the above technical means, by designing a hollow isolation plate 5 to surround the battery terminal 4b, the hollow space of the isolation plate 5 can be filled with a heat exchange medium. The heat exchange medium absorbs the heat emitted by the battery terminal 4b by means of its heat absorption capacity. In addition, the isolation plate 5 prevents the battery terminal 4b from being covered by the first through hole 5g and the second through hole 5h, maintaining its air permeability and significantly improving the heat dissipation capacity of the area near the battery terminal 4b.

[0058] In some alternative implementations, such as Figure 2 As shown, the battery pack also includes a first busbar 7, which is disposed on the side of the first sealing layer 5e facing away from the first heat exchange layer 5d. One end of the first busbar 7 is connected to a terminal post 4b, and the other end of the first busbar 7 is connected to a terminal post 4b of an adjacent battery 4 along the first direction X, with the polarity opposite to that of the terminal post 4b connected to both ends of the first busbar 7. Similarly, in some optional embodiments, the battery pack also includes a second busbar 8, with both ends of the second busbar 8 connected to terminal posts 4b of two batteries along the second direction Y with opposite or the same polarity.

[0059] Specifically, in this embodiment of the invention, a first busbar 7 and / or a second busbar 8 are provided in the through-hole space on the first heat exchange part 5a to connect different battery terminals 4b together, thereby realizing the series and parallel connection effect of multiple batteries 4, which facilitates the unified use of the electrical energy of multiple batteries 4. In addition, connecting multiple batteries 4 in series and parallel also facilitates the realization of functions such as temperature sampling and voltage sampling.

[0060] In some optional embodiments, a pressure relief hole (not shown) is provided on the battery casing 4a, the pressure relief hole penetrating the casing, and the pressure relief hole is located at a position corresponding to the position of the first heat exchange channel 5f of the casing; for example Figure 3 As shown, the battery also includes a pressure relief valve 9 that is connected to and covers the pressure relief hole.

[0061] Specifically, when battery 4 is damaged by external force or baked at high temperature, a chemical reaction occurs inside battery 4, producing a large amount of hydrogen and oxygen, as well as generating enormous heat. When this heat reaches a certain level, the pressure relief valve 9 of battery 4 will open, and the internal heat will be ejected from the valve 9. For safety, it is required that the heat generated by the runaway battery does not spread to adjacent batteries, causing the battery to run away. In this embodiment, when the separator 5 is installed on the Z-direction side of the battery pack, the separator 5 covers the position of the battery pressure relief valve 9, and the first heat exchange channel 5f is directly opposite the position of the battery pressure relief valve 9. The separator 5 is made of a fusible material with a melting point not exceeding 400 degrees Celsius. In this embodiment, if the battery experiences thermal runaway, the internal compounds and heat are ejected from the pressure relief valve 9, the separator 5 is burned through, and the heat exchange medium flows out from the first heat exchange channel 5f of the separator 5, thereby physically cooling the battery 4 to achieve a protective effect.

[0062] In some alternative embodiments, the heat exchange medium provided by the present invention is used to fill the first heat exchange channel 5f, and the heat exchange medium is a liquid medium with an electrical conductivity of not more than 5.0 mS / cm.

[0063] Specifically, when the compound and heat inside the battery are ejected from the pressure relief valve 9, the separator 5 is burned through, and the heat exchange medium flows out from the first heat exchange channel 5f of the separator 5. After the heat exchange medium flows out, it will inevitably spread to other nearby batteries 4. If the conductivity of the heat exchange medium is too high, situations may occur where positive and negative electrodes of batteries 4 are connected together, positive and negative electrodes that should not be connected are connected together, and circuits that should not be connected are connected together. Based on this, the heat exchange medium provided in this embodiment of the present invention uses a liquid medium with a conductivity of no more than 5.0 mS / cm and a sufficiently large latent heat of phase change to avoid interference with the circuit connection after the heat exchange medium flows out. According to the above technical means, the low conductivity heat exchange medium can further avoid the problem of battery short circuit when the heat exchange medium flows between different batteries.

[0064] In various embodiments of this application, the electrical conductivity of the liquid medium used for heat exchange is less than or equal to 5.0 mS / cm, that is, the electrical conductivity of the liquid medium can be controlled within the range of 0 mS / cm to 5.0 mS / cm. For example, the conductivity of the liquid medium can be any one of 0.1 mS / cm, 0.2 mS / cm, 0.4 mS / cm, 0.5 mS / cm, 0.6 mS / cm, 0.7 mS / cm, 0.9 mS / cm, 1.0 mS / cm, 1.1 mS / cm, 1.2 mS / cm, 1.3 mS / cm, 1.8 mS / cm, 1.9 mS / cm, 2.0 mS / cm, 2.1 mS / cm, 2.3 mS / cm, 2.6 mS / cm, 2.9 mS / cm, 3.0 mS / cm, 3.4 mS / cm, 3.7 mS / cm, 3.9 mS / cm, 4.0 mS / cm, 4.3 mS / cm, 4.5 mS / cm, 4.7 mS / cm, and 4.9 mS / cm. The specific values ​​of the conductivity of the liquid medium given above are merely illustrative examples, and any value within the range of 0 mS / cm to 5.0 mS / cm is within the scope of protection of this application.

[0065] In some alternative implementations, the heat exchange medium is a flame-retardant antifreeze with an electrical conductivity of no more than 5.0 mS / cm.

[0066] Specifically, when the battery pack is installed on a vehicle or other carrier, outdoor use is unavoidable. In winter, the low ambient temperature can easily freeze the heat exchange medium in the separator 5. If the heat exchange medium freezes, its volume increases due to the change from liquid to solid, potentially damaging the separator 5. This embodiment of the invention uses a low-conductivity flame-retardant antifreeze, which not only provides flame retardancy but also prevents the heat exchange medium from solidifying in low winter temperatures, thus solving the problem of the heat exchange medium increasing in volume and damaging the separator 5 after solidification.

[0067] In various embodiments of this application, the electrical conductivity of the flame-retardant antifreeze used as the heat exchange medium is less than or equal to 5.0 mS / cm, that is, the electrical conductivity of the flame-retardant antifreeze can be controlled within the range of 0 mS / cm to 5.0 mS / cm. For example, the conductivity of the flame-retardant antifreeze can be any one of 0.1 mS / cm, 0.2 mS / cm, 0.4 mS / cm, 0.5 mS / cm, 0.6 mS / cm, 0.7 mS / cm, 0.9 mS / cm, 1.0 mS / cm, 1.1 mS / cm, 1.2 mS / cm, 1.3 mS / cm, 1.8 mS / cm, 1.9 mS / cm, 2.0 mS / cm, 2.1 mS / cm, 2.3 mS / cm, 2.6 mS / cm, 2.9 mS / cm, 3.0 mS / cm, 3.4 mS / cm, 3.7 mS / cm, 3.9 mS / cm, 4.0 mS / cm, 4.3 mS / cm, 4.5 mS / cm, 4.7 mS / cm, and 4.9 mS / cm. The specific values ​​of the conductivity of the flame retardant antifreeze mentioned above are merely illustrative examples. Any value within the range of 0 mS / cm to 5.0 mS / cm is within the scope of protection of this application.

[0068] In some alternative implementations, such as Figure 8 As shown, multiple batteries 4 are arranged in a first direction X to form multiple rows, and the multiple rows of batteries are arranged in a second direction Y; the battery pack also includes multiple first separators 10, which are disposed between two adjacent batteries in the first direction X.

[0069] Preferably, the battery pack further includes a second separator 11, which is disposed between two adjacent batteries in the second direction Y.

[0070] Specifically, the first separator 10 and the second separator 11 provided in this embodiment of the present invention separate the batteries 4 from each other and maintain the relative distance between the batteries 4, thereby effectively preventing the leakage of electrolyte inside the battery pack and the leakage of gas generated during charging and discharging to a certain extent. When the battery 4 experiences thermal runaway, it can also slow down the spread of thermal runaway.

[0071] For example, in one specific embodiment, the first separator 10 and the second separator 11 can be made of silicone. Silicone has certain high-temperature resistance and insulation properties, which can effectively prevent leakage and other problems in the battery pack under high-temperature conditions. Silicone also has certain corrosion resistance, resisting the erosion of various chemicals and ensuring long-term stable use. The silicone sheet has good thermal conductivity, which can conduct heat from the heating element to the heat dissipation substrate, improving the overall heat dissipation efficiency. When a battery in the battery pack experiences a critical failure, the silicone can also isolate oxygen to a certain extent, protecting other batteries from being affected and reducing the risk of explosion. Silicone also has a sealing and waterproof function, protecting the battery pack in harsh environments and preventing moisture intrusion that could lead to short circuits or other problems.

[0072] In addition, if the temperature during battery thermal runaway is high, this embodiment of the invention can also use a thermal insulation material with a lower thermal conductivity index. The preferred range of thermal conductivity index is 0.01 W / (m·K) to 0.15 W / (m·K). When the battery experiences thermal runaway, the thermal insulation material can delay the transfer of heat, preventing the thermal runaway of one battery from causing the temperature of adjacent batteries to rise to a very high level instantly. This allows about 3 seconds for the isolation plate 5 to break, thereby preventing the thermal runaway of one battery from spreading quickly and affecting the thermal runaway of the entire battery pack, thus improving the safety of the battery pack.

[0073] In some alternative implementations, such as Figure 9 As shown, the first separator 10 includes a separator body 10a and a boss 10b disposed on the edge of the side of the separator body 10a opposite to the battery.

[0074] According to the above technical means, the battery 4 will expand during operation, with more expansion at the center of the large side of the battery 4. The partition groove formed by the boss 10b can accommodate the expanded part and play a buffering role.

[0075] In some alternative implementations, such as Figure 2 As shown, the battery pack also includes a heat exchange plate 12. The battery terminal 4b is disposed on one side of the casing in the third direction (Z), and the heat exchange plate 12 is disposed on the other side of the casing in the third direction (Z). The heat exchange plate 12 includes a second heat exchange section 12a, a third connector 12b, and a fourth connector 12c. Figure 10 and Figure 11 As shown, the second heat exchange section 12a includes a second heat exchange layer 12d connected to the battery, and a second sealing layer 12e disposed on the side of the second heat exchange layer 12d away from the battery. The second heat exchange layer 12d and the second sealing layer 12e enclose each other to form a sealed second heat exchange channel 12f. The third connector 12b is connected to the second heat exchange section 12a and communicates with the second heat exchange channel 12f. The fourth connector 12c is connected to the second heat exchange section 12a and communicates with the second heat exchange channel 12f.

[0076] Specifically, in this embodiment of the present invention, the heat exchange plate 12 also adopts a hollow design, and the heat exchange plate 12 is located on the opposite side of the battery terminal 4b. The heat exchange plate 12 is connected to the internal second heat exchange channel 12f through the third connector 12b and the fourth connector 12c, so that the heat exchange medium can flow in through one of the interfaces of the third connector 12b or the fourth connector 12c and flow out through the other interface, playing a liquid cooling role on the back of the battery, and further improving the heat dissipation capacity of the battery pack.

[0077] In some alternative embodiments, the first connector 5b, the second connector 5c, the third connector 12b, and the fourth connector 12c are all disposed on the same side of the plurality of batteries 4 in the first direction X; or, the first connector 5b, the second connector 5c, the third connector 12b, and the fourth connector 12c are all disposed on the same side of the plurality of batteries 4 in the second direction Y.

[0078] According to the above-mentioned technical means, the first connector 5b, the second connector 5c, the third connector 12b, and the fourth connector 12c are all set on the same side of the multiple batteries 4 in the first direction X or the second direction Y. In this way, the liquid medium can be injected and flowed out from the same side. Correspondingly, the expansion valve and compressor and other air conditioning system components can be set on the same side of the multiple batteries 4, eliminating the need for a long liquid medium transmission pipeline, thereby optimizing the layout of the liquid medium pipeline. Moreover, after the liquid medium is temperature controlled, it can be quickly input into the first heat exchange channel 5f and the second heat exchange channel 12f, reducing the loss of cooling or heating power. The tabs improve the heat exchange efficiency between the liquid medium and the battery 4.

[0079] Additionally, in some alternative implementations, such as Figure 12As shown, the heat exchange plate 12 and the isolation plate 5 can be integrated into a circulation loop. For example, the output pipe of the water pump 13 is connected to the first connector 5b of the isolation plate 5, the second connector 5c of the isolation plate 5 is connected to the third connector 12b of the heat exchange plate 12, and the fourth connector 12c of the heat exchange plate 12 is connected to the input pipe of the water pump 13. This allows for simultaneous cooling of the upper and lower layers of the battery pack through a single overall circulation, reducing the cost of the cooling solution. Alternatively, in an optional embodiment, an expansion tank 14 is added, with its piping connected to the circulation loop. Liquid is replenished through the expansion tank 14 when the heat exchange medium is insufficient. In addition, under normal operating conditions, the vehicle's water pump 13 serves as a power source to circulate the heat exchange medium. If the battery experiences thermal runaway and the isolation plate 5 is burned through, the water pump 13 will still operate, providing power to allow the heat exchange medium to flow out through the burned gap, thereby achieving physical cooling. If the water pump 13 happens to be unable to work during thermal runaway, the vehicle's expansion tank 14 can be used as a power source. This principle is based on the U-shaped principle of atmospheric pressure. Because the expansion tank 14 is higher than the battery pack, the heat exchange medium inside the expansion tank 14 flows out quickly through the gap under atmospheric pressure, achieving physical cooling.

[0080] This utility model also provides an electrical device in which the battery pack of the electrical device adopts the battery pack provided in the above embodiment, thereby achieving a better heat dissipation effect.

[0081] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack having a first direction (X) and a third direction (Z) that are perpendicular to each other, characterized in that, include: Box (1), having an opening; A cover plate (2) is connected to the box body (1) and covers the opening. The cover plate (2) and the box body (1) enclose a receiving cavity (3). Multiple batteries (4) are disposed in the receiving cavity (3). The multiple batteries (4) are arranged along the first direction (X). Each battery (4) includes a housing (4a) and an electrode (4b) passing through the housing (4a). The electrode (4b) is located on the side of the housing (4a) in the third direction (Z). The isolation plate (5) includes a first heat exchange section (5a), a first connector (5b), and a second connector (5c). The first heat exchange section (5a) includes a first heat exchange layer (5d) and a first sealing layer (5e). The first heat exchange layer (5d) is connected to the side of the battery (4) in the third direction (Z) where the electrode post (4b) is disposed. The first sealing layer (5e) is disposed on the side of the first heat exchange layer (5d) away from the battery (4). The first heat exchange layer (5d) and the first sealing layer (5e) together form a sealed first heat exchange section. A hot runner (5f); the first connector (5b) is connected to the first heat exchange section (5a) and communicates with the first heat exchange runner (5f), the second connector (5c) is connected to the first heat exchange section (5a) and communicates with the first heat exchange runner (5f); the first heat exchange layer (5d) is provided with a first through hole (5g), the first sealing layer (5e) is provided with a second through hole (5h), the first through hole (5g) and the second through hole (5h) are correspondingly arranged along the third direction (Z), and the pole post (4b) passes through the first through hole (5g) and the second through hole (5h).

2. The battery pack according to claim 1, characterized in that, The battery pack further includes a first busbar (7), which is disposed on the side of the first sealing layer (5e) away from the first heat exchange layer (5d). One end of the first busbar (7) is connected to the terminal post (4b), and the other end of the first busbar (7) is connected to the terminal post (4b) of the battery (4) adjacent along the first direction (X), with the polarity opposite to that of the terminal post (4b) connected to both ends of the first busbar (7).

3. The battery pack according to claim 1, characterized in that, The outer casing (4a) is provided with a pressure relief hole, which penetrates the outer casing (4a) and is located at the position corresponding to the first heat exchange channel (5f) of the outer casing (4a); the battery (4) also includes a pressure relief valve (9) connected to and covering the pressure relief hole.

4. The battery pack according to claim 3, characterized in that, The battery pack also includes a heat exchange medium, which fills the first heat exchange channel (5f); the heat exchange medium is a liquid medium with an electrical conductivity of not more than 5.0 mS / cm.

5. The battery pack according to claim 1, further comprising a second direction (Y), wherein the second direction (Y), the first direction (X), and the third direction (Z) are mutually perpendicular, characterized in that, Multiple batteries (4) are arranged in the first direction (X) and form multiple rows, and the multiple rows of batteries (4) are arranged in the second direction (Y); the battery pack also includes multiple first partitions (10), and the first partitions (10) are disposed between two adjacent batteries (4) in the first direction (X).

6. The battery pack according to claim 5, characterized in that, The first separator (10) includes a separator body (10a) and a boss (10b) disposed on the edge of the side of the separator body (10a) opposite to the battery (4).

7. The battery pack according to claim 6, characterized in that, The partition body (10a) is made of heat-insulating material.

8. The battery pack according to claim 1, characterized in that, The battery pack further includes a heat exchange plate (12), the terminal post (4b) is disposed on one side of the outer casing (4a) in the third direction (Z), and the heat exchange plate (12) is disposed on the other side of the outer casing (4a) in the third direction (Z); the heat exchange plate (12) includes a second heat exchange section (12a), a third connector (12b), and a fourth connector (12c); the second heat exchange section (12a) includes a second heat exchange layer (12d) connected to the battery (4), and is provided with A second sealing layer (12e) is placed on the side of the second heat exchange layer (12d) away from the battery (4), and the second heat exchange layer (12d) and the second sealing layer (12e) enclose to form a closed second heat exchange channel (12f); the third connector (12b) is connected to the second heat exchange part (12a) and communicates with the second heat exchange channel (12f), and the fourth connector (12c) is connected to the second heat exchange part (12a) and communicates with the second heat exchange channel (12f).

9. The battery pack according to claim 8, characterized in that, The first connector (5b), the second connector (5c), the third connector (12b), and the fourth connector (12c) are all located on the same side of the plurality of batteries (4) in the first direction (X); or, the battery pack further includes a second direction (Y), the second direction (Y), the first direction (X), and the third direction (Z) are mutually perpendicular, and the first connector (5b), the second connector (5c), the third connector (12b), and the fourth connector (12c) are all located on the same side of the plurality of batteries (4) in the second direction (Y).

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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