CN220710431U - Battery pack shell, battery pack, vehicle and electric equipment - Google Patents

Abstract

The application relates to the technical field of batteries and discloses a battery pack shell, a battery pack, a vehicle and electric equipment, wherein the battery pack shell comprises a body and a heat preservation piece, a containing cavity is formed in the body, the containing cavity comprises a first area, an isolation area and a second area, the isolation area is positioned between the first area and the second area so as to isolate the first area from the second area, and the position of the second area corresponds to the outer edge of the first area; the first area is used for accommodating the battery cell; the second area is provided with a heat preservation piece, and the heat preservation piece is used for generating heat so as to keep the temperature of the battery cell. By the technical scheme, the heat preservation performance of the battery pack can be improved, and the probability of thermal runaway is reduced.

Description

Battery pack shell, battery pack, vehicle and electric equipment

Technical Field

The application relates to the field of battery technology, in particular to a battery pack shell, a battery pack, and a vehicle and electric equipment which are provided with electric energy by the battery pack.

Background

New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like.

In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the energy storage field, the battery may be mounted in an energy storage case or directly on the user side. In these application scenarios, there is a problem that the battery is poor in performance due to low temperature, which affects the use.

Disclosure of Invention

In order to solve the technical problem, the application provides a battery pack shell with high heat preservation performance, a vehicle and electric equipment with the battery comprising the battery pack shell or the battery.

The application is realized by the following technical scheme.

A first aspect of the present application provides a battery pack case, including a body and a thermal insulation member, in which a receiving chamber is formed, the receiving chamber including a first region, an isolation region and a second region, the isolation region being located between the first region and the second region to isolate the first region from the second region, the second region being located at a position corresponding to an outer edge of the first region; the first area is used for accommodating the battery cell; the second area is provided with a heat preservation piece, and the heat preservation piece is used for generating heat so as to keep the temperature of the battery cell.

In this embodiment of the utility model, because the body is formed with and holds the chamber, hold the chamber and include first region, isolation region and second region, first region is used for holding the electric core, the second region is provided with the heat preservation piece, the heat preservation piece produces heat in order to keep the temperature of electric core, make the temperature of electric core maintain in the state that can exert better performance, moreover, isolation region is located between first region and the second region, isolation region can keep apart first region and second region, the position of second region corresponds with the outward flange of first region, isolation region is located the outside of first region promptly, the second region is located the outside of isolation region, the heat preservation piece in the second region and the electric core in the first region are not direct contact, the possibility of local electric core overheat in the first region has been reduced, in order to reduce the probability of thermal runaway when guaranteeing electric core work with better performance.

In some embodiments of the present application, the number of insulation elements is at least two, and at least two insulation elements are arranged along the circumference of the first region.

Here, at least two heat preservation pieces are arranged along the circumference of the first area, and the heat preservation pieces can be arranged in different directions of the battery cell group in the first area, so that heat transfer is performed on the battery cell group from a plurality of directions, and the temperature uniformity of the battery cell group is improved.

In some embodiments of the present application, at least two insulation members form an annular structure along the circumference of the first region to surround the first region.

Here, at least two heat preservation pieces form the annular structure and encircle wherein with the electric core in the first region, and at least two heat preservation pieces can carry out heat transfer to the electric core in the first region along a plurality of different directions for electric core in the first region is heated more evenly, improves the sameness of electric core in the first region, thereby makes electric core homoenergetic in the first region work with the preferred performance, in order to make the battery package keep better operating condition.

In some embodiments of the present application, the two ends of the annular structure are provided with insulation members to form an enclosure around the first region.

Here, the surrounding structure formed by the plurality of heat insulating members accommodates the cell group in the first region therein, and heat can be transferred from a plurality of different directions toward the cell group, thereby improving the temperature uniformity of the cell group.

In some embodiments of the present application, the insulating member is attached to the cavity wall of the receiving cavity.

Here, the heat preservation piece is connected on holding the chamber wall in chamber, can provide the support for the heat preservation piece by the chamber wall for the heat preservation piece is more firm.

In some embodiments of the present application, the accommodating cavity is square, and heat insulation members are respectively connected to opposite cavity walls of the accommodating cavity.

Here, be connected with the heat preservation piece on holding the relative chamber wall in chamber respectively, two heat preservation pieces that set up relatively can follow opposite direction towards holding the heat transfer in the chamber to provide the heat from the electric core in the relative side direction holding the chamber, make to hold electric core in the chamber and be heated more evenly.

In some embodiments of the present application, the accommodating cavity is square, and heat insulation members are respectively connected to adjacent cavity walls of the accommodating cavity.

Here, connect the heat preservation piece on holding the adjacent chamber wall in chamber respectively, two heat preservation pieces can be respectively to holding the adjacent side transfer heat of electric core group in the chamber for electric core group's adjacent side electric core can both obtain more even heat, especially electric core group's corner, also can obtain the heat, thereby makes electric core group's corner and electric core group's other part can obtain comparatively balanced heat, further promotes electric core group's samming nature.

In some embodiments of the present application, the receiving cavity includes a plurality of cavity walls, and each cavity wall is connected with a thermal insulation member.

Here, each chamber wall that holds the chamber all is connected with the heat preservation spare, holds the heat preservation spare on the chamber and can form surrounding structure, will hold electric core group parcel in the chamber wherein to from a plurality of different directions towards electric core group transmission heat, with the homogeneity that promotes electric core group and receive heat.

In some embodiments of the present application, the insulating member is a sheet-like structure, the insulating member extending along an outer edge of the first region.

Here, sheet structure's heat preservation spare can reduce the heat preservation spare size for the heat preservation spare is more small and exquisite frivolous, and when the material volume is the same, and sheet structure's heat preservation spare can correspond the battery cell group of bigger area, so that can extend to the edge of battery cell group, provides more even heat transfer for the battery cell group.

In some embodiments of the present application, the battery pack case further includes a separator disposed within the body to form at least two receiving chambers within the body, and a thermal insulation member is disposed on the separator.

Here, the separator can divide into a plurality of accommodation cavities to hold the electric core group respectively, make the size of every electric core group reduce relatively, the heat that electric core group edge received is more easy to transmit to the center of electric core group, and sets up the heat preservation piece on the separator, can increase the quantity of separator in this body, further promotes the samming nature of the electric core of everywhere in this body. In addition, the separating piece can also provide support for the body, and the structural strength of the body is improved.

In some embodiments of the present application, the divider has a heat channel formed therein, the heat channel communicating with at least two receiving chambers.

Here, the arrangement of the heat channel makes the air current in two at least holding chambers that are linked together flow each other, makes the temperature in two at least holding chambers tend to be the same through convection action to the homogeneity of electric core group in the different holding chambers has been improved.

In some embodiments of the present application, the dimension of the body in the height direction thereof is larger than the dimension of the separator in the height direction of the body to form a heat channel at one side of the separator in the height direction of the body.

Here, the heat channel is provided at the edge of the partitioning member, so that the influence on the insulating member arranged on the partitioning member can be reduced, and the arrangement of the insulating member on the partitioning member is more convenient.

In some embodiments of the present application, the battery pack housing further comprises a heat exchange assembly for transferring heat from the battery cell to the outside of the housing, the heat exchange assembly comprising a heat exchange plate disposed within the receiving chamber, and the thermal insulation member disposed between the chamber wall of the receiving chamber and the heat exchange plate.

Here, heat exchange assembly's setting can realize the intensification and the cooling of electric core group fast, and the setting of heat preservation spare is between holding the chamber wall and the heat exchanger plate in chamber, can make the heat exchanger plate be close to electric core group on the one hand, improves the heat exchange efficiency between heat exchanger plate and the electric core group, and on the other hand, the heat exchanger plate separates heat preservation spare and electric core group to avoid the direct contact of heat exchanger plate and electric core group.

A second aspect of the present application provides a battery pack comprising the battery pack housing of any one of the first aspects, further comprising a battery cell stack disposed in a first region of the battery pack housing, the battery cell stack comprising at least one stacked battery cell.

According to the battery pack provided by the embodiment of the application, due to the battery pack shell comprising the first aspect, the first area and the second area can be isolated by the isolation area of the battery pack shell, the heat preservation piece in the second area is not in direct contact with the battery core in the first area, the possibility of local overheating of the battery core in the first area is reduced, and the possibility of thermal runaway is reduced while the battery core is ensured to work with better performance.

In some embodiments of the application, the battery pack shell further comprises a temperature measuring piece and a controller, the temperature measuring piece is arranged in the battery cell group and at the edge of the battery cell group, the controller is electrically connected with the temperature measuring piece, the temperature measuring piece is used for monitoring the temperature of the battery cell at the corresponding position, and the controller controls the heat preservation piece to generate heat according to the detection result of the temperature measuring piece.

Here, through setting up controller and temperature measurement spare for the controller carries out intelligent regulation and control to the heat production of heat preservation spare according to the electric core temperature that temperature measurement spare measured, makes the heat production ability of heat preservation spare more pointed, and the inside and the edge of electric core group all set up temperature measurement spare, can acquire the electric core temperature of electric core group different positions, and the true temperature condition of electric core group can be reflected more to the electric core temperature that obtains.

In some embodiments of the present application, the temperature measuring element is a temperature measuring element disposed in each cell, and the controller obtains the temperature of each cell through the temperature measuring element, and controls the heat generated by the heat insulating element according to the maximum value and the minimum value of the plurality of temperatures.

Here, the temperature of each electric core can be obtained by the controller, so that the electric core temperature obtained by the controller is more representative, a better basis can be provided for the decision of the controller, and the controller can control the heat preservation piece according to the maximum value and the minimum value of the electric core temperature, so that the control is more targeted, and the heat preservation piece can be controlled to generate heat so as to reduce the temperature difference of the battery pack.

A third aspect of the present application provides a vehicle comprising the battery pack of any one of the second aspects, further comprising a power mechanism, the battery pack being electrically coupled to the power mechanism.

According to the vehicle provided by the embodiment of the application, as the vehicle comprises the battery pack, the battery pack comprises the battery pack shell, the isolation area of the battery pack shell can isolate the first area from the second area, the heat preservation piece in the second area is not in direct contact with the battery core in the first area, the possibility of overheating of the local battery core in the first area is reduced, and the possibility of thermal runaway is reduced while the battery core is ensured to work with better performance.

A fourth aspect of the present application provides an electrical consumer comprising the battery pack of any of the second aspects, further comprising an electrical consumer, the battery pack being electrically coupled to the electrical consumer.

According to the electric equipment, the battery pack comprises the battery pack shell, the isolation area of the battery pack shell can isolate the first area from the second area, the heat preservation piece in the second area is not in direct contact with the battery core in the first area, the possibility of overheating of the local battery core in the first area is reduced, and the battery core is ensured to work with better performance and meanwhile the probability of thermal runaway is reduced.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural view of a battery pack case according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a thermal insulation member in a battery can body according to an embodiment of the present application, where the thermal insulation member is disposed along a first area circumferential direction;

Fig. 3 is a schematic view of a ring-shaped structure formed by a heat insulating member in a battery can body according to an embodiment of the present application;

fig. 4 is a top view of a surrounding structure formed by a thermal insulation member in a battery can body according to an embodiment of the present application;

fig. 5 is an isometric view of a thermal insulation member forming an enclosure structure in a battery can body provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a relative arrangement of heat insulation members in a battery can body according to an embodiment of the present disclosure;

fig. 7 is a schematic view of an adjacent arrangement of heat insulation members in a battery can body according to an embodiment of the present disclosure;

fig. 8 is a top view of a thermal insulation member connected to a cavity wall of a receiving cavity in a battery can body according to an embodiment of the present application;

fig. 9 is an isometric view of a thermal insulation member in a battery can body according to an embodiment of the present disclosure connected to a cavity wall of a receiving cavity;

fig. 10 is a schematic structural view of a separator in a battery pack case according to an embodiment of the present application;

fig. 11 is a schematic structural view of a heat channel in a battery can body according to an embodiment of the present disclosure;

fig. 12 is a schematic view of a communication accommodating cavity of a heat channel in a battery can body provided in an embodiment of the present application;

fig. 13 is a front view of a heat exchange assembly in a battery pack housing provided in an embodiment of the present application;

FIG. 14 is a side view of a heat exchange assembly in a battery pack housing provided in an embodiment of the present application;

Fig. 15 is a top view of a heat exchange assembly in a battery pack housing provided in an embodiment of the present application;

fig. 16 is a schematic structural view of a vehicle according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of an electric device according to an embodiment of the present application;

fig. 18 is a flowchart of a temperature control method according to an embodiment of the present application.

Reference numerals:

1-a body; 11-a receiving cavity; 111-a first region; 112-isolation regions; 113-a second region; 2-a heat preservation piece; 3-spacers; 31-heat channel; 4-a heat exchange assembly; 41-heat exchange plates; 411-pipe; 5-an electric core; 6-a power mechanism; 7-an electric appliance.

Detailed Description

For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.

In the present embodiments, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in the embodiments of the present application, the terms "upper," "lower," "left," and "right," etc., are defined with respect to the orientation in which the components in the drawings are schematically disposed, and it should be understood that these directional terms are relative terms, which are used for descriptive and clarity with respect to each other, and which may vary accordingly with respect to the orientation in which the components in the drawings are disposed.

In the embodiments herein, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either a fixed connection, a removable connection, or an integral body; can be directly connected or indirectly connected through an intermediate medium.

In the present embodiments, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The present application will be described in detail below.

At present, new energy batteries are increasingly widely applied to life and industry. The new energy battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuous.

In many application scenarios, the battery adopts a battery pack form, the battery pack comprises a battery core, the performance of the battery core is influenced by environmental temperature, for example, when the temperature is lower, the charge and discharge performance of the battery core is influenced, so that the battery core is difficult to exert better working performance.

But the heat preservation piece laminating can lead to the battery core overheated and influence the samming performance of battery package on the battery core, and the heat preservation piece is too close to the battery core still can lead to the battery core too high temperature moreover, causes the overheated and damage of battery core, brings the risk of thermal runaway.

Therefore, referring to fig. 1, the battery pack according to the embodiment of the present application includes a battery pack case and a battery cell group, in which a housing cavity 11 is formed in the battery pack case, a battery cell 5 is disposed in the housing cavity 11, and the battery cell group includes at least one battery cell 5 stacked.

In this embodiment of the present application, the number of the battery cells 5 in the battery pack may be plural, and the plural battery cells 5 may be connected in series or parallel or in series-parallel, where in series-parallel refers to that the plural battery cells 5 are connected in series or parallel. The multiple electric cores 5 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the multiple electric cores 5 is placed in a containing cavity 11 formed by the battery pack shell; of course, the battery pack can also be in a form of a battery module formed by connecting a plurality of battery cells 5 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole body, and the battery pack is accommodated in an accommodating cavity 11 formed by the battery pack shell. The battery pack may further include other structures, for example, a bus bar member for making electrical connection between the plurality of battery cells 5.

In this embodiment, the battery cell 5 may be a secondary battery, and the secondary battery refers to the battery cell 5 that can be continuously used by activating the active material in a charging manner after the battery cell 5 is discharged.

The battery cell 5 may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like, which is not limited in the embodiment of the present application.

Although not shown, the battery cell 5 generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell 5, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

In this embodiment, the electrode assembly is provided with a tab (not shown), and the tab can conduct current from the electrode assembly. The tab includes a positive tab and a negative tab.

In the embodiment of the present application, the battery cell 5 may include a housing. The case is used to encapsulate the electrode assembly, the electrolyte, and the like. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.

As an example, the battery cell 5 may be a cylindrical battery cell 5, a prismatic battery cell 5, a soft package battery cell 5, or other shaped battery cells 5, and the prismatic battery cell 5 includes a square case battery cell 5, a blade-shaped battery cell 5, a polygonal prismatic battery cell such as a hexagonal battery cell, etc., which is not particularly limited in this application.

In the embodiment of the application, the case includes a case body (not shown) provided with an opening and an end cap (not shown) closing the opening to form a closed space for accommodating the electrode assembly, electrolyte, and the like. The shell element may be provided with one or more openings. One or more end caps may also be provided.

In this embodiment, at least one electrode terminal (not shown) is provided on the case, and the electrode terminal is electrically connected to a tab (not shown). The electrode terminal may be directly connected to the tab, or may be indirectly connected to the tab through the adapter member. The electrode terminal may be provided on the terminal cover or may be provided on the case unit.

In addition, referring to fig. 1, the battery pack case further includes a body 1 and a heat insulating member 2, a receiving chamber 11 is formed in the body 1, the receiving chamber 11 includes a first region 111, an isolation region 112, and a second region 113, the isolation region 112 is located between the first region 111 and the second region 113 to isolate the first region 111 from the second region 113, and the second region 113 is located corresponding to an outer edge of the first region 111; the first region 111 is for accommodating the battery cell 5; the second region 113 is provided with a thermal insulation 2, the thermal insulation 2 being adapted to generate heat to maintain the temperature of the cells 5.

In this embodiment, body 1 is the main bearing structure of battery package, is formed with in the body 1 and holds chamber 11 and be used for placing electric core 5, and body 1 is used for bearing electric core 5 to keep apart electric core 5 and external world, thereby provide the protection for electric core 5.

In this embodiment, the accommodating cavity 11 includes a first area 111, an isolation area 112, and a second area 113, and it should be noted that the first area 111, the isolation area 112, and the second area 113 are all three-dimensional areas, and the first area 111, the isolation area 112, and the second area 113 have volumes capable of accommodating objects respectively.

In this embodiment, the isolation region 112 isolates the first region 111 from the second region 113, specifically, the isolation region 112 is located between the first region 111 and the second region 113, so that the object in the first region 111 and the object in the second region 113 are not contacted.

In this embodiment, the position of the second area 113 corresponds to the outer edge of the first area 111, specifically, the size of the inner outline of the second area 113 is larger than the size of the outer outline of the first area 111, and the second area 113 is located outside the first area 111.

In this embodiment of the present application, the battery cell 5 may be a battery cell capable of performing charge and discharge, and the working performance of the battery cell 5, such as charge or discharge, is greatly affected by temperature, because when a plurality of battery cells 5 are connected in series to form a battery cell group, the working performance of the battery cell group depends on the working performance of the battery cell 5 with the lowest temperature in the battery cell group. Therefore, it is necessary to keep the battery cell 5 at a proper temperature so that it exhibits a preferable operation performance.

In the embodiment of the application, the heat preservation piece 2 can slow down heat exchange between the battery cell 5 in the accommodating cavity 11 and the outside. In some embodiments of the present application, the insulation 2 is made of a porous insulating material, such as foam material, fibrous material, etc., which converts heat conduction into heat radiation, thereby retarding heat exchange. In other embodiments of the present application, the heat insulation member 2 may be coated with a heat reflective material, such as nickel, aluminum plating, etc., so as to improve heat reflection, thereby reducing heat exchange efficiency and further reducing heat exchange between the battery cell 5 and the outside.

In this embodiment, the heat insulation member 2 can also generate heat to supplement the heat loss of the battery cell 5, so as to maintain the temperature of the battery cell 5. In some embodiments of the present application, a resistance heating wire is provided in the insulating member 2, and the resistance heating wire generates heat after being electrified, thereby maintaining the temperature of the battery cell 5. In other embodiments of the present application, a pipe is disposed in the heat insulating member 2, the pipe is connected to a heating component, a liquid medium flows in the pipe, the heating component heats the liquid medium, and heat is transferred to the electric core 5 through the liquid medium, so that the temperature of the electric core 5 is maintained.

Here, since the accommodating cavity 11 is formed in the body 1, the accommodating cavity 11 includes the first area 111, the isolation area 112 and the second area 113, the first area 111 is used for accommodating the battery cell 5, the second area 113 is provided with a heat-insulating member, the heat-insulating member generates heat to keep the temperature of the battery cell 5, so that the temperature of the battery cell 5 can be kept in a state capable of exerting better performance, furthermore, the isolation area 112 is located between the first area 111 and the second area 113, the isolation area 112 can isolate the first area 111 from the second area 113, the position of the second area 113 corresponds to the outer edge of the first area 111, namely, the isolation area 112 is located at the outer side of the first area 111, the second area 113 is located at the outer side of the isolation area 112, the heat-insulating member 2 in the second area 113 is not in direct contact with the battery cell 5 in the first area 111, the possibility of overheating of the local battery cell 5 in the first area 111 is reduced, and the possibility of thermal runaway is reduced while the battery cell 5 is ensured to work with better performance.

The first area 111 may accommodate at least one battery cell 5, where the at least one battery cell 5 forms a battery cell group, and the battery cells 5 in the battery cell group are stacked in the first area 111. For example, at least two cells 5 are stacked in a single-layer structure within the first region 111, i.e., at least two cells 5 are arranged spread along the same plane; for another example, at least two of the cells 5 form a multi-layered structure, the cells 5 in each layer being spread out along the same plane.

Referring to fig. 2, in some embodiments of the present application, at least two insulation members 2 are arranged along the circumference of the first region 111, and at least two insulation members 2 are arranged along the circumference of the first region.

In this embodiment, the circumference of the first area 111 is a direction around the central axis of the first area 111 and can encircle the circumference of the first area 111, and in this embodiment, the outer contour of the first area 111 may be in a block shape, a column shape, a cake shape, or the like.

The outer contour of the first area 111 may be cylindrical, and the cylindrical first area 111 has a central axis, and a direction surrounding the first area 111 around the central axis is a circumferential direction. Alternatively, the outer contour of the first region 111 is square, and the square first region 111 has three central axes perpendicular to each other, and correspondingly, the first region 111 may be surrounded from three different directions, which are all circumferential directions of the first region 111.

In this embodiment of the present application, at least two heat preservation pieces 2 are arranged along the circumference of the first area 111, which may be that at least two heat preservation pieces 2 are arranged along the circumference of the first area 111 at intervals, that is, there is a gap between two adjacent heat preservation pieces 2, and also may be that at least two heat preservation pieces 2 are arranged continuously along the circumference of the first area 111.

Here, at least two heat insulating members 2 may be disposed in different directions of the cell group in the first region 111 along the circumferential direction of the first region 111, so as to perform heat transfer to the cell group from multiple directions, thereby improving the temperature uniformity of the cell group.

Referring to fig. 3, in some embodiments of the present application, at least two insulation members 2 are formed in an annular structure along the circumference of the first region 111 to surround the first region 111.

In this embodiment, at least two heat preservation pieces 2 are arranged along the circumference of the first region 111, and an annular structure can be formed by sequentially arranging at least two heat preservation pieces 2, and the annular structure is sleeved on the outer side of the first region 111.

Wherein adjacent heat preservation pieces 2 in at least two heat preservation pieces 2 can be connected together; or, at least two heat preservation pieces 2 are independently arranged, and a gap is reserved between two adjacent heat preservation pieces 2.

Here, the at least two heat preservation pieces 2 form a ring structure to encircle the battery cell group in the first area 111 therein, and the at least two heat preservation pieces 2 can transfer heat to the battery cell group in the first area 111 along a plurality of different directions, so that the battery cell group in the first area 111 is heated more uniformly, the temperature uniformity of the battery cells 5 in the first area 111 is improved, and therefore the battery cells 5 in the first area 111 can work with better performance, and the battery pack can keep a better working state.

Referring to fig. 4 and 5, in some embodiments of the present application, the two ends of the annular structure are provided with insulation 2 to form an enclosure around the first region 111.

In this embodiment, two ends of the annular structure, specifically, two ends of the annular structure along the central axis surrounded by the annular structure.

In this embodiment, the first region 111 of surrounding structure parcel, specifically each face in first region 111 all corresponds and is provided with heat preservation piece 2, and the surrounding structure that heat preservation piece 2 formed holds wherein with the electric core group in the first region 111, can follow a plurality of different directions towards electric core group transmission heat to improve electric core group's samming nature.

Referring to fig. 6, 7 and 8, in some embodiments of the present application, the insulating member 2 is attached to the cavity wall of the accommodating cavity 11.

In this embodiment, the cavity wall is a structural surface on the body 1 for forming the accommodating cavity 11, where the cavity wall may extend along a plane or may extend along an arc surface. The receiving chamber 11 includes at least two chamber walls, for example, the receiving chamber 11 is cylindrical, which includes an arc-shaped side wall and end walls at both ends of the side wall.

In this embodiment of the present application, the heat-preserving member 2 may be connected to the cavity wall in various manners, for example, the heat-preserving member 2 and the cavity wall may be connected in an undetachable manner such as adhesion, welding, etc., and for example, the heat-preserving member 2 and the cavity wall may be connected in a detachable manner such as a clamping connection, a fastening connection, etc.

Here, the heat insulating member 2 is connected to the cavity wall of the accommodating cavity 11, and the cavity wall can provide support for the heat insulating member 2, so that the heat insulating member 2 is more stable.

Referring to fig. 6, in some embodiments of the present application, the accommodating cavity 11 is square, and insulation members 2 are respectively connected to opposite cavity walls of the accommodating cavity 11.

In this embodiment, the square accommodating chamber 11 includes six chamber walls, the upper chamber wall and the lower chamber wall are oppositely disposed, the front chamber wall and the rear chamber wall are oppositely disposed, and the left chamber wall and the right chamber wall are oppositely disposed.

In this embodiment, the heat preservation members 2 are respectively connected to opposite chamber walls of the accommodating chamber 11. For example, the left cavity wall and the right cavity wall are respectively connected with a heat preservation piece 2, and the heat preservation piece 2 connected with the left cavity wall and the heat preservation piece 2 connected with the right cavity wall are oppositely arranged; for another example, the heat insulating member 2 is connected to the front side chamber wall and the rear side chamber wall, respectively, and the heat insulating member 2 connected to the front side chamber wall and the heat insulating member 2 connected to the rear side chamber wall are disposed opposite to each other.

Here, the heat preservation pieces 2 are respectively connected to opposite cavity walls of the accommodating cavity 11, and the two heat preservation pieces 2 oppositely arranged can transfer heat from opposite directions to the accommodating cavity 11 so as to provide heat from opposite sides to the battery cells 5 in the accommodating cavity 11, so that the battery cells 5 in the accommodating cavity 11 are heated more uniformly.

Referring to fig. 7, in some embodiments of the present application, the accommodating cavity 11 is square, and heat insulation members 2 are respectively connected to adjacent cavity walls of the accommodating cavity 11.

In the embodiment of the present application, the square accommodating cavity 11 includes six cavity walls, each cavity wall corresponds to four adjacent side walls, for example, the front side cavity wall corresponds to an adjacent upper side cavity wall, lower side cavity wall, left side cavity wall and right side cavity wall; for another example, the left side chamber wall corresponds to an adjacent upper side chamber wall, lower side chamber wall, front side chamber wall, and rear side chamber wall.

In this embodiment, the adjacent cavity walls of the accommodating cavity 11 are respectively connected with the heat insulation member 2, that is, any one of a certain cavity wall of the accommodating cavity 11 and four adjacent cavity walls corresponding to the certain cavity wall is connected with the heat insulation member 2, for example, the front side cavity wall and the adjacent left side cavity wall are both connected with the heat insulation member 2; alternatively, a heat insulating member 2 is connected to one of the cavity walls of the accommodating cavity 11 and any adjacent cavity wall corresponding thereto, for example, the heat insulating member 2 is connected to the rear cavity wall and the adjacent upper and right cavity walls thereof, respectively.

Here, the adjacent chamber walls of the accommodating chamber 11 are respectively connected with the heat-insulating members 2, and the two heat-insulating members 2 can respectively transfer heat to the adjacent sides of the cell groups in the accommodating chamber 11, so that the adjacent side cells 5 of the cell groups can obtain relatively uniform heat, especially the corners of the cell groups can also obtain heat, and therefore the corners of the cell groups and the rest parts of the cell groups can obtain relatively uniform heat, and the temperature uniformity of the cell groups is further improved.

Referring to fig. 5 and 9, in some embodiments of the present application, the receiving chamber 11 includes a plurality of chamber walls, and each chamber wall is connected with a thermal insulation member 2.

In this embodiment, the accommodating cavity 11 may be square, cylindrical, or the like, and the accommodating cavity 11 includes a plurality of adjacent or opposite cavity walls.

Here, each cavity wall of the accommodating cavity 11 is connected with a heat insulating member 2, and the heat insulating member 2 on the accommodating cavity 11 can form a surrounding structure, so that the battery cell group in the accommodating cavity 11 is wrapped therein, and heat is transferred from a plurality of different directions towards the battery cell group, so that the heating uniformity of the battery cell group is improved.

Referring to fig. 9, in some embodiments of the present application, insulation 2 is a sheet-like structure, with insulation 2 extending along an outer edge of first region 111.

In this embodiment of the present application, the heat insulating member 2 of the sheet structure may be a hard sheet structure that is not easily deformed, or may be a flexible film structure that is easily deformed.

In this embodiment, the extension of the heat insulation member 2 along the outer edge of the first area 111 may be that the outline of the heat insulation member 2 is similar to the outer outline of the first area 111, for example, the outer outline of the first area 111 is square, and the outline of the heat insulation member 2 formed by extension is also square.

Here, the heat preservation piece 2 of sheet structure can reduce the heat preservation piece 2 size for heat preservation piece 2 is small and exquisite frivolous more, and when the material volume is the same, the heat preservation piece 2 of sheet structure can correspond the battery cell group of bigger area, so that can extend to the edge of battery cell group, provides more even heat transfer for the battery cell group.

In this embodiment, the outline of body 1 and the outline shape that holds chamber 11 can set up similarly, for example, the outline of body 1 and the outline that holds chamber 11 are square, and body 1 includes bottom plate and apron, and bottom plate and apron are parallel to each other, are provided with a plurality of curb plates between bottom plate and the apron, and the curb plate connects gradually and forms annular structure, bottom plate and curb plate integrated into one piece, and the apron can be dismantled and be connected on the bottom plate, and bottom plate, apron and curb plate enclose and close and form and hold chamber 11.

Referring to fig. 10 and 11, in some embodiments of the present application, the battery pack case further includes a separator 3, the separator 3 being disposed in the body 1 to form at least two receiving chambers 11 in the body 1, and the heat insulating member 2 being disposed on the separator 3.

In this embodiment, the partition 3 may be a plate-like member disposed in the body 1, and the partition 3 may be parallel to any one of the side plates of the body 1, or alternatively, the partition 3 may be disposed obliquely with respect to the side plate of the body 1.

Wherein, the separating piece 3 can be connected to the bottom plate, and the separating piece 3 can also be connected to the side plate, or, the separating piece 3, the bottom plate and the side plate are integrally formed.

In this embodiment, the number of the spacers 3 is one or more, and the plurality of spacers 3 may be arranged in parallel or may be arranged vertically, for example, two spacers 3 are arranged in a crisscross manner, and four accommodating chambers 11 are formed in the body 1.

Wherein, a plurality of holding cavities 11 in the body 1 can be the same or different in shape, and each holding cavity 11 holds the electric core 5 respectively, and the heat preservation piece 2 can be set up respectively on the chamber wall of each holding cavity 11, especially set up heat preservation piece 2 on the partition piece 3.

Here, the partition 3 can divide into a plurality of accommodating cavities 11 to accommodate the electric core groups respectively, so that the size of each electric core group is relatively reduced, heat received by the edges of the electric core groups is more easily transferred to the center of the electric core group, and the heat preservation pieces 2 are arranged on the partition 3, so that the number of the partition 3 in the body 1 can be increased, and the temperature uniformity of the electric cores 5 at all positions in the body 1 is further improved. In addition, the partition 3 can also provide support for the body 1, improving the structural strength of the body 1.

Referring to fig. 11 and 12, in some embodiments of the present application, a heat channel 31 is formed on the partition 3, and the heat channel 31 communicates with at least two accommodating chambers 11.

In this embodiment, the heat channel 31 is a channel that can communicate two accommodating chambers 11 with each other, so that an air flow can flow between two accommodating chambers 11, when the temperature in one of the accommodating chambers 11 is higher, the air flow in the accommodating chamber 11 with higher temperature will flow toward the accommodating chamber 11 with lower temperature due to convection, thereby transferring heat from the accommodating chamber 11 with higher temperature to the accommodating chamber 11 with lower temperature.

In this embodiment, the heat channel 31 may be connected to two adjacent accommodating chambers 11, or may be connected to three or more accommodating chambers 11.

Here, the heat channels 31 are arranged so that the air flows in the at least two accommodating chambers 11 which are communicated can flow mutually, and the temperatures in the at least two accommodating chambers 11 tend to be the same through convection, so that the temperature uniformity of the cell groups in the different accommodating chambers 11 is improved.

Referring to fig. 11 and 12, in some embodiments of the present application, the dimension of the body 1 in the height direction thereof is larger than the dimension of the separator 3 in the height direction of the body 1 to form the heat channel 31 at one side of the separator 3 in the height direction of the body 1.

In this embodiment, the height of the body 1 may be a direction perpendicular to the bottom plate of the body 1, and the dimension of the body 1 along the height direction thereof is greater than the dimension of the separator 3 along the height direction of the body 1, so that the separator 3 is not in contact with the cover plate, thereby forming the heat channel 31 between the separator 3 and the cover plate.

Wherein the heat channel 31 may also be formed between the partition 3 and the bottom plate; alternatively, the heat channel 31 is formed between the partition 3 and the side plate; still alternatively, the heat passage 31 may be a through hole opened in the partition 3.

Here, the heat passage 31 is provided at the edge of the partitioning member 3, so that the influence on the heat insulating member 2 laid on the partitioning member 3 can be reduced, and the layout of the heat insulating member 2 on the partitioning member 3 can be facilitated.

Referring to fig. 13, 14 and 15, in some embodiments of the present application, the battery pack housing further includes a heat exchange assembly 4, the heat exchange assembly 4 is used for transferring heat of the battery cell 5 to the outside of the housing, the heat exchange assembly 4 includes a heat exchange plate 41 disposed in the accommodating chamber 11, and the heat insulating member 2 is disposed between the chamber wall of the accommodating chamber 11 and the heat exchange plate 41.

In this embodiment, heat exchange assembly 4 is used for exchanging heat with electric core 5, and heat exchange assembly 4 can be with heat transfer to electric core 5 to promote electric core 5's temperature, or, heat exchange assembly 4 absorbs the heat from electric core 5 department, thereby for electric core 5 cooling.

The heat exchange assembly 4 comprises a heat exchange plate 41, the heat exchange plate 41 can exchange heat with the electric core 5, and the heat exchange plate 41 can be made of materials with high heat conductivity such as copper; or, the heat exchange plate 41 is internally provided with a heat pipe, and the heat pipe can rapidly transfer heat through the heat convection principle; still alternatively, the heat exchange plate 41 may be provided with a channel, which communicates with the heating device or the cooling device, and a liquid medium flows in the channel, so that efficient heat exchange can be performed through the liquid medium.

In this embodiment, heat preservation spare 2 sets up between holding chamber 11's chamber wall and heat exchanger plate 41, and heat exchanger plate 41 laminating holds the electric core group in the chamber 11 to separate electric core group and heat preservation spare 2, wherein, heat exchanger plate 41 can set up on the diapire of body 1, also can set up on the lateral wall or the apron of body 1, and illustratively, the heat exchanger ring sets up between the electric core group of the diapire of body 1.

Here, the setting of heat exchange assembly 4 can realize the intensification and the cooling of electric core group fast, and heat preservation spare 2 sets up between holding the chamber wall and the heat exchanger plate 41 of chamber 11, can make heat exchanger plate 41 be close to electric core group on the one hand, improves the heat exchange efficiency between heat exchanger plate 41 and the electric core group, and on the other hand, heat exchanger plate 41 separates heat preservation spare 2 and electric core group to avoid the direct contact of heat exchanger plate 41 and electric core group.

In this embodiment, battery package casing still includes temperature measurement spare and controller, and the inside and the edge of electric core group all set up temperature measurement spare, and controller and temperature measurement spare electric connection, temperature measurement spare are used for monitoring the temperature of corresponding position electric core 5, and the heat preservation spare 2 is produced according to the testing result control heat of temperature measurement spare to the controller.

In this embodiment of the application, the temperature measurement piece can be temperature sensor, and the temperature measurement piece can be resistance type temperature sensor, radial temperature sensor etc. and the temperature measurement piece can be used to obtain the electric core 5 temperature of corresponding position.

In this embodiment of the present application, the corresponding position of the battery cell 5 refers to the battery cell 5 connected with the temperature measuring element in the battery cell group of the temperature measuring element, for example, the temperature measuring element is disposed at the edge position of the battery cell group, so that the temperature of the battery cell 5 at the edge can be obtained, and for example, the temperature measuring element is disposed at the center of the battery cell group, so that the temperature of the battery cell 5 at the center of the battery cell group can be obtained.

In the embodiment of the present application, the controller refers to a device that can be executed according to a computer instruction to control the operation state of the thermal insulation member 2, for example, the controller is a battery management system (battery management system, BMS) integrated in a battery pack.

In this embodiment of the present application, the electrical connection between the controller and the temperature measuring member refers to that signals can be transmitted between the controller and the temperature measuring member, for example, the temperature measuring member transmits the temperature of the battery cell 5 measured by the temperature measuring member to the controller, and it can be understood that the controller is also electrically connected to the heat insulating member 2, and the controller can drive the heat insulating member 2 to change the working state.

In this embodiment, the working state of the heat insulating member 2 may be whether to start heating, heating power, heating time, etc. of the heat insulating member 2.

Here, through setting up controller and temperature measurement spare for the controller carries out intelligent regulation and control to the heat production of heat preservation spare 2 according to the electric core 5 temperature that temperature measurement spare measured, makes the heat production ability of heat preservation spare 2 more have pertinence, and the inside and the edge of electric core group all set up temperature measurement spare, can acquire electric core 5 temperature in electric core group different positions, and the true temperature condition of electric core group can be reflected more to electric core 5 temperature that obtains.

In this embodiment of the present application, the temperature measuring element is a temperature measuring element disposed in each electric core 5, and the controller obtains the temperature of each electric core 5 through the temperature measuring element, and controls the heat generated by the heat insulating element 2 according to the maximum value and the minimum value in the plurality of temperatures.

In this embodiment of the present application, the temperature measuring element may be a negative temperature coefficient thermistor (negative temperature coefficient, NTC), and the temperature measuring element is integrated in the electric core 5, and the temperature measuring element can obtain the temperature of the electric core 5 where the temperature measuring element is located, and transmit the temperature data of the electric core 5 to the controller, so that the controller can obtain the corresponding temperatures of all the electric cores 5 in the body 1.

In this embodiment of the present application, the maximum value and the minimum value in the multiple temperatures refer to that the controller compares the temperatures of all the battery cells 5 in the same time period, so as to determine that the battery cell 5 temperature with the largest value is the maximum value, and determine that the battery cell 5 temperature with the smallest value is the minimum value.

In the embodiment of the application, the heat preservation member 2 is controlled according to the maximum value and the minimum value in the temperature, for example, the controller controls the heat preservation member 2 to stop generating heat according to the maximum value; for another example, the controller controls the heat insulating member 2 to start generating heat according to the minimum value; for another example, the controller controls the operation state of the thermal insulation member 2 according to the difference between the maximum value and the minimum value.

Here, the temperature of each electric core 5 can be obtained by the controller, so that the temperature of the electric core 5 obtained by the controller is more representative, a better basis can be provided for the decision of the controller, the controller controls the heat preservation part 2 according to the maximum value and the minimum value of the temperature of the electric core 5, the control is more targeted, and the heat preservation part 2 can be controlled to generate heat so as to reduce the temperature difference of the battery pack.

The battery pack provided by the embodiment of the application can be used in an energy storage power supply system, a vehicle, a ship or an aircraft and other electric devices, but is not limited to. Because the battery pack that this application embodiment provided is provided with isolation region on its body, isolation region keeps apart the electric core in heat preservation spare and the first region, when heat preservation spare produced heat and kept electric core temperature, reduces thermal runaway's probability.

The battery pack provided by the embodiment of the application can be also used in an energy storage power supply system, a vehicle, a ship or an aircraft and other electric devices, but is not limited to. The use of a battery pack can provide a higher total energy. Moreover, the battery pack is formed by arranging a plurality of grouped batteries in the sealed box body, so that the battery pack has more reliable dustproof and waterproof performance, and can be applied to scenes in which the use environment is worse, moist and even immersed.

The embodiment of the application also provides an electricity utilization device comprising the battery pack for providing electric energy, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

Fig. 16 is a schematic structural diagram of a vehicle provided in an embodiment of the present application, where the vehicle may be a fuel-oil vehicle, a gas-oil vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended range vehicle.

Referring to fig. 16, the interior of the vehicle is provided with a battery pack, which may be provided at the bottom, the head or the tail of the vehicle, and which may be used for power supply of the vehicle, for example, the vehicle includes a power mechanism 6, and the battery pack supplies power to the power mechanism 6 to enable the vehicle to travel; for another example, the vehicle includes a driving assistance system including a lamp, a vehicle-mounted air conditioner, etc., and the battery pack may supply power to the driving assistance system; for another example, the vehicle includes an in-vehicle entertainment system, and the battery pack is used to power the in-vehicle entertainment system.

Referring to fig. 17, the embodiment of the present application further provides an electric device, where the electric device includes an electric device 7 and a battery pack provided in the embodiment of the present application, the electric device 7 is electrically coupled to the battery pack, and the electric device 7 can operate by means of electric energy supply of the battery pack.

According to the battery pack, the BMS can obtain the temperature of each battery cell 5, the temperature of all the battery cells 5 is compared, the maximum value, the minimum value and the temperature difference value are obtained, and the heat preservation piece 2 is controlled to heat accordingly, so that the temperature difference of the battery cell group is reduced, the performance of the battery cell group is improved, the heat preservation piece 2 and the battery cell group are provided with intervals, and the possibility of local overheating of the battery cells 5 can be reduced.

On this basis, the embodiment of the present application provides a battery pack temperature control method, and the controller is configured to execute the method, so as to control the working state of the thermal insulation member 2, and referring to fig. 18, the battery pack temperature control method includes:

s100: the controller obtains the temperatures of the plurality of battery cells 5, and obtains the maximum value, the minimum value and the temperature difference value according to the temperatures of the plurality of battery cells 5.

In this embodiment of the present application, the temperatures of the plurality of electric cells 5 are compared to obtain a maximum value and a minimum value, and the maximum value and the minimum value are differenced to obtain a temperature difference, where the temperature difference may reflect the uniformity of heat distribution of the electric cell group.

Specifically, a larger temperature difference indicates that the heat distribution of the battery cell group is not uniform, the performance of the battery cell group is limited by the temperature of the battery cell 5, and better performance is difficult to develop; when the temperature difference is smaller, the heat distribution of the battery cell group is more uniform, and the battery cell group can exert better performance.

S200: judging whether the temperature difference is greater than or equal to a first threshold, and executing step S300 when the temperature difference is greater than or equal to the first threshold: the heat-insulating member 2 is controlled to start generating heat, otherwise, step S400 is executed: the heat insulating member 2 is controlled to stop generating heat.

In this embodiment of the present application, the battery cell 5 has a suitable temperature range, and the suitable temperature range of the electrical property is related to materials, structures, production processes, etc. of the battery cell 5, for example, the battery cell 5 is made of materials less affected by temperature, the performance of the battery cell 5 is less affected by temperature change, and the suitable temperature range of the battery cell 5 is wider. For another example, the cell 5 with the finish machining is more stable than the cell 5 with the rough machining, and can accommodate a wider range of temperature variation.

On the basis, the first threshold value is used for comparing with the temperature difference value, and the first threshold value can reflect the adaptability of the battery cell 5 to temperature change, namely, when the suitable temperature range of the battery cell 5 is wider, the first threshold value can be set to a larger value, and when the suitable temperature range of the battery cell 5 is narrower, the first threshold value can be set to a smaller value.

In this embodiment of the present application, the first threshold may be selected within a range of 5 degrees celsius to 10 degrees celsius, for example, the first threshold may be 5 degrees celsius, 7.5 degrees celsius, 10 degrees celsius, or the like.

As an example, the first threshold is 5 degrees celsius, when the temperature difference is equal to or greater than 5 degrees celsius, the heat insulating member 2 is controlled to start generating heat, and when the temperature difference is less than 5 degrees celsius, the heat insulating member 2 is controlled to stop generating heat.

In an embodiment of the present application, the temperature control method further includes the steps of:

s500: judging whether the temperature difference is smaller than the second threshold, and executing step S400 when the temperature difference is smaller than the first threshold: the heat insulating member 2 is controlled to stop generating heat, otherwise step S100 is performed.

In this embodiment, the second threshold and the first threshold are both used for comparing with the temperature difference, and similar to the first threshold, the second threshold is also affected by the suitable temperature of the battery cell 5, where the second threshold and the first threshold may be the same or different, and the second threshold may be selected within a range of 5 degrees celsius to 10 degrees celsius, for example, the second threshold may be 5 degrees celsius, 7.5 degrees celsius, 10 degrees celsius, and so on.

As an example, the second threshold is the same as the first threshold, the second threshold is 5 degrees celsius, and when the temperature difference is less than 5 degrees celsius, the heat insulating member 2 is controlled to stop generating heat.

In an embodiment of the present application, the temperature control method further includes the steps of:

s600: judging whether the minimum value is smaller than or equal to a third threshold value, and executing step S300 when the minimum value is smaller than or equal to the first threshold value: the heat-insulating member 2 is controlled to start generating heat, otherwise, step S400 is executed: the heat insulating member 2 is controlled to stop generating heat.

In this embodiment of the present application, the minimum suitable temperature of the battery cell 5 is related to the material, structure, production process, etc. of the battery cell 5, for example, when the electrolyte of the battery cell 5 is made of a material with a higher melting point, the viscosity of the electrolyte of the battery cell 5 increases at a low temperature, and at this time, the performance of the battery cell 5 is poor at a low temperature, and the minimum suitable temperature of the battery cell 5 is higher. Therefore, the determination of the third threshold value is related to the minimum suitable temperature of the battery cell 5, and is smaller when the minimum suitable temperature of the battery cell 5 is lower, and is larger when the minimum suitable temperature of the battery cell 5 is higher.

In the embodiment of the present application, the third threshold may be selected in a range of 5 degrees celsius to 10 degrees celsius, for example, the third threshold may be 5 degrees celsius, 7.5 degrees celsius, 10 degrees celsius, or the like.

As an example, the third threshold is 5 degrees celsius, and when the minimum value is 5 degrees celsius or less, the heat insulating member 2 is controlled to start generating heat.

In an embodiment of the present application, the temperature control method further includes the steps of:

s700: judging whether the maximum value is greater than the fourth threshold, and executing step S400 when the maximum value is greater than the fourth threshold: the heat insulating member 2 is controlled to stop generating heat, otherwise step S100 is performed.

In this embodiment of the present application, the maximum suitable temperature of the battery cell 5 is related to the material, structure, production process, etc. of the battery cell 5, for example, when the electrolyte of the battery cell 5 is made of a material with a lower melting point, the viscosity of the electrolyte of the battery cell 5 is reduced at a high temperature, and at this time, the performance of the battery cell 5 at a high temperature is poor, and the maximum suitable temperature of the battery cell 5 is low. Therefore, the determination of the fourth threshold value is related to the maximum suitable temperature of the battery cell 5, and is smaller when the maximum suitable temperature of the battery cell 5 is lower and larger when the maximum suitable temperature of the battery cell 5 is higher.

In the embodiment of the present application, the fourth threshold may be selected in a range of 10 degrees celsius to 20 degrees celsius, for example, the fourth threshold may be 10 degrees celsius, 15 degrees celsius, 20 degrees celsius, or the like.

As an example, the fourth threshold is 15 degrees celsius, and when the maximum value is greater than 15 degrees celsius, the heat insulating member 2 is controlled to stop generating heat.

It is understood that after step S400 is performed, step S100 is continuously performed to circularly perform the temperature control method of the embodiment of the present application.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description.

In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (18)

1. A battery pack case, comprising:

the device comprises a body, wherein a containing cavity is formed in the body, the containing cavity comprises a first area, an isolation area and a second area, the isolation area is positioned between the first area and the second area so as to isolate the first area from the second area, and the position of the second area corresponds to the outer edge of the first area;

the first area is used for accommodating the battery cell;

the second region is provided with a thermal insulation member for generating heat to maintain the temperature of the battery cell.

2. The battery pack housing as claimed in claim 1, wherein at least two of the heat insulating members are arranged in a circumferential direction of the first region.

3. The battery pack case according to claim 2, wherein at least two of the heat insulating members are formed in a ring-shaped structure along the circumference of the first region so as to surround the first region.

4. A battery pack housing as claimed in claim 3, wherein the heat retaining members are provided at both ends of the annular structure to form an enclosure around the first region.

5. The battery pack housing as claimed in claim 1, wherein the thermal insulating member is attached to a wall of the accommodating chamber.

6. The battery pack housing as claimed in claim 5, wherein the receiving chamber has a square shape, and the heat insulating members are respectively connected to opposite chamber walls of the receiving chamber.

7. The battery pack case according to claim 5, wherein the accommodating chambers are square, and the heat insulating members are respectively connected to adjacent chamber walls of the accommodating chambers.

8. The battery pack housing as claimed in claim 5, wherein the receiving chamber includes a plurality of chamber walls, and the insulating member is connected to each of the chamber walls.

9. The battery pack case according to any one of claims 1 to 7, wherein the heat insulating member is a sheet-like structure, and the heat insulating member extends along an outer edge of the first region.

10. The battery pack case according to any one of claims 1 to 7, further comprising a partition provided in the body to form at least two of the accommodation chambers therein, the partition being provided with the heat insulating member thereon.

11. The battery pack case according to claim 10, wherein the partition is formed with a heat passage communicating with at least two of the accommodation chambers.

12. The battery pack case according to claim 11, wherein a dimension of the body in a height direction thereof is larger than a dimension of the separator in the body height direction to form the heat channel at one side of the separator in the body height direction.

13. The battery pack housing as claimed in any one of claims 1 to 7, further comprising a heat exchange assembly for transferring heat of the battery cells to an outside of the housing, the heat exchange assembly comprising a heat exchange plate disposed within the receiving chamber, the heat insulating member being disposed between a chamber wall of the receiving chamber and the heat exchange plate.

14. A battery pack, comprising:

the battery pack case of any one of claims 1 to 13;

the battery cell group is arranged in the first area of the battery pack shell and comprises at least one battery cell which is stacked.

15. The battery pack according to claim 14, further comprising a temperature measuring member and a controller, wherein the temperature measuring member is disposed in the battery cell group, and the temperature measuring member is electrically connected to the controller, the temperature measuring member is used for monitoring the temperature of the battery cell at a corresponding position, and the controller controls the heat insulating member to generate heat according to the detection result of the temperature measuring member.

16. The battery pack of claim 15, wherein the temperature measuring member is a temperature measuring element provided in each of the cells, and the controller obtains the temperature of each of the cells through the temperature measuring element and controls the amount of heat generated by the heat insulating member according to the maximum and minimum values among the plurality of temperatures.

17. A vehicle, characterized by comprising:

a power mechanism;

the battery pack of any one of claims 14-16, electrically coupled to the power mechanism.

18. A powered device, comprising:

an electric appliance;

the battery pack of any one of claims 14-16, electrically coupled to the electrical consumer.