CN220272634U - Battery and electricity utilization device - Google Patents

Abstract

The application provides a battery and an electric device, which can improve the performance of the battery. The battery includes: a first battery cell; a second battery cell; the box body comprises a first box body part and a second box body part, the second box body part is of a hollow structure with an opening, and the first box body part covers the opening to form a first accommodating space for accommodating the first battery unit and a second accommodating space for accommodating the second battery unit; the second box portion comprises a first wall which is arranged opposite to the opening, the first box portion comprises a second wall which is arranged opposite to the opening, the second wall comprises a first portion corresponding to the first accommodating space and a second portion corresponding to the second accommodating space, the distance between the second portion and the first wall is larger than the distance between the first portion and the first wall, and the size of the second battery cell is larger than the size of the first battery cell along the thickness direction of the first wall.

Description

Battery and electricity utilization device

Technical Field

The present disclosure relates to battery technology, and in particular, to a battery and an electric device.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. How to improve the internal structure of the battery to improve the performance thereof becomes a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a battery and an electricity utilization device, which can improve the performance of the battery.

In a first aspect, there is provided a battery comprising: a first battery cell; a second battery cell; the box body comprises a first box body part and a second box body part, the second box body part is of a hollow structure with an opening, and the first box body part covers the opening to form a first accommodating space for accommodating the first battery unit and a second accommodating space for accommodating the second battery unit; the second box body comprises a first wall which is opposite to the opening, the first box body comprises a second wall which is opposite to the opening, the second wall comprises a first part corresponding to the first accommodating space and a second part corresponding to the second accommodating space, the distance between the second part and the first wall is larger than that between the first part and the first wall, and the size of the second battery unit is larger than that of the first battery unit along the thickness direction of the first wall.

In this application embodiment, the box of battery has different sizes in its thickness direction to form the accommodation space that is used for holding not unidimensional battery monomer respectively, thereby make full use of the space between battery and the front and back row seat of vehicle, be favorable to improving the volume utilization ratio and the energy density of battery.

In one implementation, the battery further comprises: at least one accommodating shell which is arranged in the box body and divides the box body into at least one first accommodating space, wherein a third accommodating space is arranged in the accommodating shell; and a third battery cell disposed in the third accommodation space.

Set up the accommodation shell in the box and separate the box into at least one first accommodation space, set up first battery monomer in first accommodation space to set up the third battery monomer in the third accommodation space in the accommodation shell, both effectively utilized the space in the accommodation shell for setting up extra third battery monomer, utilized the accommodation shell again to realize the isolation between first battery monomer and the third battery monomer, be favorable to reducing the propagation of risk between the battery monomer of different grade under the circumstances that takes place the risk in the battery.

In one implementation, the second wall further includes a third portion corresponding to the receiving case, wherein a distance between the third portion and the first wall is smaller than a distance between the first portion and the first wall, and a size of the third battery cell is smaller than a size of the first battery cell in a thickness direction of the first wall; and/or, the distance between the third part and the first wall is smaller than the distance between the second part and the first wall, and the size of the third battery cell is smaller than the size of the second battery cell along the thickness direction of the first wall.

The box has three kinds of sizes in its thickness direction to form respectively and be used for holding the elementary accommodation space of the elementary battery of first battery, the elementary battery of second and the elementary battery of third of size different, thereby make full use of the space between battery and the front and back row seat of vehicle, be favorable to improving the volume utilization ratio and the energy density of battery.

In one implementation, the battery includes a first battery cell group including a plurality of the first battery cells connected in parallel and a third battery cell group including a plurality of the third battery cells connected in parallel, the first battery cell group being connected in series with the third battery cell group. The first battery monomer group is formed after the first battery monomers with enough quantity are connected in parallel, the third battery monomer group is formed after the third battery monomers with enough quantity are connected in parallel, the first battery monomer group and the third battery monomer group are connected in series, and the current in a charge-discharge loop can be increased, so that the effective high-voltage output is provided for the battery together, and the charge-discharge requirement of the battery is easily met.

In one implementation, the chemical systems of the first cell and the third cell are different. For example, the first battery cell is a battery cell of a lithium iron phosphate material, and/or the third battery cell is a battery cell of a ternary material. Thus, the overall energy of the battery can be increased without increasing the volume and weight of the battery.

In one implementation, the battery includes a first battery cell group including a plurality of the first battery cells connected in parallel and a second battery cell group including a plurality of the second battery cells connected in parallel, the first battery cell group being connected in series with the second battery cell group. The first battery monomer group is formed after the first battery monomers with enough quantity are connected in parallel, the second battery monomer group is formed after the second battery monomers with enough quantity are connected in parallel, the first battery monomer group and the second battery monomer group are connected in series, and the current in a charge-discharge loop can be increased, so that the effective high-voltage output is provided for the battery together, and the charge-discharge requirement of the battery is easily met.

In one implementation mode, the capacity of the second battery unit group is Cap2, and the capacity of the first battery unit group is Cap1, wherein Cap2 is more than or equal to Cap1. When the second battery unit group is connected with the first battery unit group in series, the current in the series circuit is the same, and the circuit current depends on the minimum current on the circuit, and the capacity Cap2 of the second battery unit group is not smaller than the capacity Cap1 of the first battery unit group, so that the current of the whole circuit can be prevented from becoming smaller, and the battery can meet the charge and discharge requirements.

In one implementation, the projected area of the second portion is smaller than the projected area of the first portion in the thickness direction of the first wall. Since most of the area of the first housing portion is relatively low, the first housing portion is allowed to be upwardly convex only at a partial position of the seat bottom, the central passage, etc., so that most of the space in the housing portion is used for accommodating the battery cell having a small height, and only the small space can accommodate the battery cell having a large height. The projected area of the second portion is smaller than the projected area of the first portion.

In a second aspect, there is provided an electrical device comprising a battery according to the first aspect or any implementation of the first aspect, the battery being adapted to provide electrical energy to the electrical device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a battery according to an embodiment of the present application.

Fig. 3 is an exploded view of a battery according to an embodiment of the present application.

Fig. 4 is a cross-sectional view of the battery shown in fig. 3.

Fig. 5 is an exploded view of a battery according to another embodiment of the present application.

Fig. 6 is a cross-sectional view of the battery shown in fig. 5.

In the drawings, the drawings are not drawn to scale.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

The term "plurality" as used herein means two or more, and the term "plurality" means two or more.

In this embodiment of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use. The battery cell may be, for example, 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.

The battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charge and discharge of the battery cell, active ions such as 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 some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector, and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (e.g., liFePO ₄ (also abbreviated as LFP)), composite material of lithium iron phosphate and carbon, and manganese lithium phosphate (such as LiMnPO) ₄ ) At least one of a composite material of lithium manganese phosphate and carbon, and a composite material of lithium manganese phosphate and carbon.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector, and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the negative electrode tab may include a negative electrode current collector, and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, the anode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like.

In some embodiments, the negative electrode may employ a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. In the case where the metal foam is used as the negative electrode sheet, the surface of the metal foam may not be provided with the negative electrode active material, but may be provided with the negative electrode active material.

As an example, a lithium source material, which is a lithium metal and/or a lithium-rich material, potassium metal, or sodium metal, may also be filled and/or deposited within the negative electrode current collector.

The material of the positive electrode current collector may be, for example, aluminum, and the material of the negative electrode current collector may be, for example, copper.

The separator in the electrode assembly is disposed between the positive electrode and the negative electrode. In some embodiments, the separator is a separator film. The type of the isolating membrane is not limited, and any known isolating membrane with a porous structure and good chemical stability and mechanical stability can be selected. For example, the main material of the separator may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The type of electrolyte is not limited, and can be selected according to requirements. The electrolyte may be liquid, gel or solid.

In this embodiment of the present application, the electrode assembly may be a winding structure, in which the positive electrode sheet and the negative electrode sheet are wound to form a winding structure. The electrode assembly may also be a lamination structure, for example, the positive electrode sheet and the negative electrode sheet may be provided in plurality, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked. Or, the positive pole pieces can be arranged in a plurality, the negative pole pieces are folded to form a plurality of folded sections which are arranged in a stacked mode, and one positive pole piece is clamped between the adjacent folded sections; or, the positive electrode plate and the negative electrode plate are folded to form a plurality of folded sections which are arranged in a stacked mode.

The separator can be arranged in a plurality of ways and is respectively arranged between any adjacent positive pole pieces or negative pole pieces.

In some embodiments, the separator may be disposed continuously, by being folded or rolled, between any adjacent positive or negative electrode sheets.

The electrode assembly in the embodiments of the present application may have a cylindrical shape, a flat shape, a polygonal column shape, or the like, for example. The electrode assembly may be provided with tabs for conducting current away from the electrode assembly. The tab includes a positive tab and a negative tab.

In some embodiments, the battery cell includes 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. The housing includes a case and a cover plate.

The battery cell may be, for example, a cylindrical battery cell, a prismatic battery cell, a soft pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, or a polygonal battery cell, for example, a hexagonal battery cell, etc., which is not limited in this application.

The battery described in embodiments of the present application may be a single physical module that includes one or more battery cells to provide higher voltage and capacity. In the case of a plurality of battery cells, the plurality of battery cells are connected in series, in parallel, or in series-parallel through the bus bar member.

In some embodiments, the battery may be a battery module, where there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being accommodated in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

The battery is usually set up in the front and back row seat below of vehicle, has certain space between the top of battery and the seat bottom, and present battery design can't utilize this part space, and for this reason, this application provides a battery, through design into irregular shape and set up not unidimensional battery monomer in the battery in order to adapt to the shape of box to improve the volume utilization ratio and the energy density of battery.

The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, for example, mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecraft, and the like, and for example, spacecraft include airplanes, rockets, space shuttles, spacecraft, and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described devices, but may be applied to all devices using batteries, but for simplicity of description, the following embodiments are described by taking an electric vehicle as an example.

For example, as shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application, the vehicle 1 may be a fuel-oil vehicle, a gas-fired 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. The motor 30, the controller 20, and the battery 10 may be provided inside the vehicle 1, and the controller 20 is configured to control the battery 10 to supply power to the motor 30. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, e.g. the battery 10 may be used as an operating power source for the vehicle 1, for electrical circuitry of the vehicle 1, e.g. for start-up, navigation and operational power requirements of the vehicle 1. In another embodiment of the present application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1. In addition, a battery for low-voltage power supply, for example a 12V or 48V battery, may be provided in the vehicle 1.

To meet different power requirements for use, the battery may include a plurality of battery cells. The plurality of battery cells can form a plurality of battery cell groups in a serial connection, parallel connection or series-parallel connection mode according to the types of the battery cells, and the plurality of battery cell groups are connected in series to form a battery, wherein the series-parallel connection is a mixture of serial connection and parallel connection. The plurality of different battery cells can also be directly connected in series, parallel or series-parallel to form a battery. That is, the plurality of battery cells may directly constitute the battery, or the battery cell group may be first formed according to the type of the battery cell, and then the battery cell group may be formed into the battery.

Fig. 2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application, and the battery 10 may include a plurality of battery cells (not shown). The battery 10 may further include a case (or cover) 110, wherein the case 110 has a hollow structure, and a plurality of battery cells are accommodated in the case 110. The housing 110 may include two portions, referred to herein as a first housing portion 111 and a second housing portion 112, respectively, the first housing portion 111 and the second housing portion 112 being snap-fit together. The shape of the first and second case parts 111 and 112 may be determined according to the shape of the combination of the plurality of battery cells, at least one of the first and second case parts 111 and 112 having one opening.

For example, as shown in fig. 2, only one of the first case portion 111 and the second case portion 112 is a hollow rectangular parallelepiped having an opening, and the other is a plate-like shape to cover the opening. Here, taking the second case 112 as a hollow structure and only one surface as an opening surface, the first case 111 is in the shape of a plate, and then the first case 111 is covered at the opening of the second case 112 to form a case 110 having a closed chamber that can be used to accommodate a plurality of battery cells. The plurality of battery cells are connected in parallel, in series or in a combination of series and parallel, and then placed in a box 110 formed by buckling a first box portion 111 and a second box portion 112.

For another example, unlike the embodiment shown in fig. 2, the first case portion 111 and the second case portion 112 may each have a hollow structure and only one surface thereof is an open surface, the openings of the first case portion 111 and the second case portion 112 are disposed opposite to each other, and the first case portion 111 and the second case portion 112 are fastened to each other to form the case 110 having a closed chamber. The plurality of battery cells are connected in parallel, in series or in a combination of series and parallel, and then placed in a box 110 formed by buckling a first box portion 111 and a second box portion 112.

In addition, other structures may be included in the battery 10, and are not described in detail herein.

As an example, as shown in fig. 3 to 6, the battery 10 includes a case 110, the case 110 including a first case portion 111 and a second case portion 112, the second case portion 112 being a hollow structure having an opening, the first case portion 111 covering the opening to form a first receiving space 131 for receiving the first battery cell 11 and a second receiving space 132 for receiving the second battery cell 12; wherein the second housing part 112 comprises a first wall 1101 disposed opposite to the opening, the first housing part 111 comprises a second wall 1102 disposed opposite to the opening, the second wall 1102 comprises a first portion 1102A corresponding to the first accommodation space 131 and a second portion 1102B corresponding to the second accommodation space 132, and a distance between the second portion 1102B and the first wall 1101 is greater than a distance between the first portion 1102A and the first wall 1101. As shown in fig. 3 and 4, the battery 10 further includes a first battery cell 11 and a second battery cell 12, wherein the second battery cell 12 has a size H2 along the thickness direction Z of the first wall 1101, and the first battery cell 11 has a size H1, wherein H2 > H1. Alternatively, the thickness direction Z of the first wall 1101 may also be the thickness direction of the case 110.

It will be appreciated that the first wall 1101 and the second wall 1102 are two opposite walls of the case 110 in the thickness direction Z, the distance between the first wall 1101 and the second wall 1102 is not uniform, the distance between the first wall 1101 and the first portion 1102A of the second wall 1102 is D1, and the distance between the first wall 1101 and the second portion 1102B of the second wall 1102 is D2, where D2 > D1. D1 and D2 may be sized according to the size of the space between the battery 10 and the front and rear seats of the vehicle to make full use of the space between the battery 10 and the front and rear seats of the vehicle.

Wherein the accommodating space formed between the first wall 1101 and the first portion 1102A is used for accommodating the first battery cell 11, so that it is required to satisfy d1+.h1; the accommodation space formed between the first wall 1101 and the second portion 1102B is for accommodating the second battery cell 12, and thus it is required to satisfy d2.gtoreq.h2.

It can be seen that the case 110 of the battery 10 has different sizes in the thickness direction Z thereof to form receiving spaces for receiving the battery cells of different sizes, respectively, thereby fully utilizing the space between the battery and the front and rear seats of the vehicle for receiving the battery cells, thus being advantageous in improving the volume utilization rate and energy density of the battery 10.

Since most of the area of the first housing part 111 is relatively low, the first housing part 111 is allowed to be upwardly protruded only at a partial position of the seat bottom, the central passage, etc., so that most of the space in the housing 110 is used to accommodate the battery cell having a small height, and only the small space can accommodate the battery cell having a large height. Thus, in some embodiments, the projected area of the second portion 1102B is smaller than the projected area of the first portion 1102A along the thickness direction Z of the first wall 1101.

In some embodiments, the battery 10 includes a first battery cell stack 121 and a second battery cell stack 122, the first battery cell stack 121 including a plurality of first battery cells 11 in parallel, the second battery cell stack 122 including a plurality of second battery cells 12 in parallel, the first battery cell stack 121 being in series with the second battery cell stack 122. The first battery unit groups 121 are formed by connecting a sufficient number of first battery units 11 in parallel, the second battery unit groups 122 are formed by connecting a sufficient number of second battery units 12 in parallel, and the first battery unit groups 121 and the second battery unit groups 122 are connected in series, so that the current in a charge-discharge loop can be increased, and the effective high-voltage output is provided for the battery together, and the battery can meet the charge-discharge requirement easily. The first battery cell group 121 is disposed in an accommodating space formed between the first wall 1101 and the first portion 1102A, and the second battery cell group 122 is disposed in an accommodating space formed between the first wall 1101 and the second portion 1102B.

In some embodiments, the capacity of the second battery cell group 122 is Cap2, and the capacity of the first battery cell group 121 is Cap1, cap 2. Gtoreq.Cap 1.

The first battery cell group 121 includes a plurality of first battery cells 11 connected in parallel, and a capacity Cap1 of the first battery cell group 121 is a sum of capacities of the plurality of first battery cells 11 in the first battery cell group 121; the second battery cell group 122 includes a plurality of second battery cells 12 connected in parallel, and the capacity Cap2 of the second battery cell group 122 is the sum of the capacities of the plurality of second battery cells 12 in the second battery cell group 122. The capacity of a battery cell refers to, for example, the initial capacity of the battery cell, that is, the capacity of the battery cell measured at a discharge rate of 0.33C under a specific charge/discharge termination voltage at room temperature (25 ℃) in ampere hours (Ah).

When the second battery cell group 122 is connected in series with the first battery cell group 121, since the current in the series loop is the same and the loop current depends on the minimum current on the loop, the capacity Cap2 of the second battery cell group 122 is set to be not smaller than the capacity Cap1 of the first battery cell group 121, so that the current of the whole loop is prevented from becoming smaller, and the battery 10 meets the charge and discharge requirements.

In some embodiments, as shown in fig. 5, the battery 10 further includes at least one receiving case 130, the at least one receiving case 130 is disposed in the case 110, and divides the case 110 into at least one first receiving space 131, and the receiving case 130 has a third receiving space 133 therein. The battery 10 further includes a third battery cell 13, and the third battery cell 13 is disposed in the third accommodating space 133.

In some embodiments, the second wall 1102 further includes a third portion 1102C corresponding to the receiving case 130, wherein a distance D3 between the third portion 1102C and the first wall 1101 is smaller than a distance D1 between the first portion 1102A and the first wall 1101, and a dimension H3 of the third battery cell 13 is smaller than a dimension H1 of the first battery cell 11 along a thickness direction Z of the first wall 1101; and/or, a distance D3 between the third portion 1102C and the first wall 1101 is smaller than a distance D2 between the second portion and the first wall 1101, and a dimension H3 of the third battery cell 13 is smaller than a dimension H2 of the second battery cell 12 along a thickness direction Z of the first wall 1101.

For example, as shown in fig. 6, the case 110 has three dimensions in the thickness direction Z thereof to form accommodation spaces for accommodating the first battery cell 11, the second battery cell 12, and the third battery cell 13, respectively, which are different in size, thereby fully utilizing the space between the battery 10 and the front and rear seats of the vehicle, which is advantageous in improving the volume utilization rate and the energy density of the battery 10.

As shown in fig. 6, a distance D1 is formed between the first wall 1101 and the first portion 1102A of the second wall 1102, a distance D2 is formed between the first wall 1101 and the second portion 1102B of the second wall 1102, and a distance D3 is formed between the first wall 1101 and the third portion 1102C of the second wall 1102, wherein D2 > D1 > D3. Along the thickness direction Z of the first wall 1101, the second cell 12 has a size H2, the first cell 11 has a size H1, and the third cell 13 has a size H3, wherein H2 > H1 > H3.

D1, D2, and D3 may be sized according to the size of the space between the battery 10 and the front-rear seats of the vehicle to make full use of the space between the battery 10 and the front-rear seats of the vehicle. Wherein the accommodating space formed between the first wall 1101 and the first portion 1102A is used for accommodating the first battery cell 11, so that it is required to satisfy d1+.h1; the accommodation space formed between the first wall 1101 and the second portion 1102B is for accommodating the second battery cell 12, and thus it is required to satisfy d2+.h2; the accommodation space formed between the first wall 1101 and the third portion 1102C is for accommodating the third battery cell 13, and thus it is required to satisfy d3.gtoreq.h3.

In some embodiments, the battery 10 further includes a third battery cell group 123, the third battery cell group 123 including a plurality of third battery cells 13 connected in parallel, the third battery cell group 123 being connected in series with the first battery cell group 121. The first battery unit group 121 is formed by connecting a sufficient number of first battery units 11 in parallel, the third battery unit group 123 is formed by connecting a sufficient number of third battery units 13 in parallel, and the first battery unit group 121 and the third battery unit group 123 are connected in series, so that the current in a charge-discharge loop can be increased, and the effective high-voltage output is provided for the battery 10 together, and the battery 10 can easily meet the charge-discharge requirement. The first battery cell group 121 is disposed in an accommodating space formed between the first wall 1101 and the first portion 1102A, and the third battery cell group 123 is disposed in an accommodating space formed between the first wall 1101 and the third portion 1102C.

The receiving case 130 may be disposed at any position within the case 110. In some embodiments, the receiving case 130 may be disposed at a central portion within the case 110. For example, as shown in fig. 5 and 6, the number of the accommodating cases 130 is one, and the accommodating cases 130 are disposed at the middle of the case 110 to partition the inner space of the case 110 along the first direction X of the case 110 to form two first accommodating spaces 131. For another example, the number of the accommodating cases 130 is plural, which are disposed at intervals along the first direction X of the case 110 to partition the inner space of the case 110 along the first direction X to form a plurality of first accommodating spaces 131.

In other embodiments, the receiving case 130 may be provided at an edge region within the case 110. For example, the receiving case 130 may be disposed at one end of the case 110 such that the receiving case 130 and the other end of the case 110 together form a first receiving space 131.

The number of the receiving cases 130 may be one or more. For example, the number of the receiving cases 130 may be identical to the number of the third battery cell groups 123, i.e., the number of the third receiving spaces 133 in the receiving cases 130 is identical to the number of the third battery cell groups 123, so that the third receiving spaces 133 in each receiving case 130 serve to receive one third battery cell group 123. Of course, the number of the third receiving spaces 133 may be inconsistent with the number of the third battery cell groups 123, and in this case, the third receiving spaces 133 may be used to receive a plurality of the third battery cell groups 123.

Since the accommodating case 130 is disposed in the case 110 and the case 110 is partitioned into at least one first accommodating space 131, the first battery cell stack 121 is disposed in the first accommodating space 131, and the third battery cell stack 123 is disposed in the third accommodating space 133 in the accommodating case 130, not only is the space in the accommodating case 130 effectively utilized to dispose the additional third battery cell stack 123, but also the accommodating case 130 is utilized to realize the isolation between the first battery cell stack 121 and the third battery cell stack 123, which is beneficial to reducing the risk of propagation between different battery cell stacks in case of occurrence of a risk in the battery, for example, the accommodating case 130 can prevent the thermal runaway from propagating to the first battery cell stack 121 in the first accommodating space 131 to a certain extent in case of occurrence of a risk of thermal runaway or the like in the third battery cell stack 123 in the accommodating case 130, so as to control the risk in the third accommodating space 133.

The first battery cell 11 may be, for example, a cylindrical battery cell, a prismatic battery cell, or another battery cell, and the third battery cell 13 may be, for example, a cylindrical battery cell, a prismatic battery cell, or another battery cell. The shapes of the first battery cell 11 and the third battery cell 13 may be the same or different. Fig. 5 and 6 illustrate an example in which the third battery cell 13 is a prismatic battery cell.

Alternatively, the receiving case 130 may be fixed in the case 110 by a detachable connection. For example, the housing case 130 and the case 110 may be fixed by a mechanical connection such as a screw connection, a pin connection, or a snap connection. In this way, in case that the third battery cell group 123 in the second receiving space 132 of the receiving case 130 fails, it is convenient to detach the receiving case 130 from the case 110 to repair or replace the third battery cell group 123.

Optionally, as shown in fig. 5, a recess is further provided on the housing 130 for receiving the mounting sleeve 160. The mount mounting sleeve 160 is used to accommodate a mounting mechanism for mounting the battery 10 to an external mechanism. An opening is provided in the first housing part 111 of the housing 110 at a position corresponding to the mount mounting sleeve 160 so that the mount mechanism passes through the opening to be connected to an external mechanism.

It can be seen that, in this embodiment of the present application, the housing shell 130 is disposed in the housing shell 110 of the battery 10, the housing shell 130 separates the housing shell 110 into at least one first housing space 131, the first battery cell 11 is disposed in the first housing space 131, and the third battery cell 13 is disposed in the third housing space 133 in the housing shell 130, which effectively utilizes the space in the housing shell 130 to set up the additional third battery cell 13, and further utilizes the housing shell 130 to realize isolation between the first battery cell 11 and the third battery cell 13, which is beneficial to reducing the propagation of risks between different types of battery cells under the condition that risks occur in the battery.

In some embodiments, the chemical systems of the first cell 11 and the third cell 13 are different. For example, the first cell is a cell of lithium iron phosphate (LiFePO, LFP) material, and/or the third cell is a cell of ternary material (Ni-Co-Mn, NCM).

Generally, the overall energy of the battery can be improved by increasing the number of battery cells or the battery cells with high volume energy density such as the battery cells adopting the NCM chemical system. However, increasing the number of battery cells results in an increase in the volume and mass of the battery, while the safety of the battery cells of the NCM chemical system is poor. The battery 10 is internally provided with two battery monomers with different chemical systems, for example, a third battery monomer group 123 formed by connecting a plurality of ternary lithium battery monomers in parallel is connected with a first battery monomer group 121 formed by connecting a plurality of lithium iron phosphate battery monomers in parallel in series, so that the advantage of high-temperature stability of the lithium iron phosphate battery monomers can be utilized, the advantage of high energy density of the ternary lithium battery monomers can be fully utilized to compensate the disadvantage of the lithium iron phosphate battery monomers, and the energy density of the battery 10 is improved, thereby improving the overall energy of the battery on the premise of not increasing the volume and the weight of the battery 10.

In some embodiments, as shown in fig. 3 to 6, the battery 10 further includes a high voltage module 151 and/or a control module 152, and the high voltage module 151 and/or the control module 152 may be disposed, for example, in a receiving space of an edge of the case 110. The high voltage module 151 includes, for example, a relay, a fuse, a DC/DC converter, and the like. The control module 152 is used to monitor and manage the battery 10, and for example, includes a battery management unit (Battery Management Unit, BMU) or the like, which may be used to control the closing or opening of a relay or the like within the high voltage module 151 to enable charging or discharging of the battery 10.

Based on the above description, the case 110 of the battery 10 according to the embodiment of the present application has different dimensions in the thickness direction Z thereof to form accommodating spaces for accommodating battery cells of different dimensions, respectively, thereby fully utilizing the space between the battery 10 and the front-rear seats of the vehicle for accommodating the battery cells, and facilitating the improvement of the volume utilization rate and energy density of the battery 10.

The application also provides an electric device, comprising the battery 10 in any embodiment, wherein the battery 10 is used for providing electric energy for the electric device. The electric device may be, for example, the vehicle shown in fig. 1.

It should be noted that, on the premise of no conflict, the embodiments described in the present application and/or the technical features in the embodiments may be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall into the protection scope of the present application.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. 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 (10)

1. A battery, the battery comprising:

a first battery cell;

a second battery cell; the method comprises the steps of,

the box body comprises a first box body part and a second box body part, wherein the second box body part is of a hollow structure with an opening, and the first box body part covers the opening to form a first accommodating space for accommodating the first battery unit and a second accommodating space for accommodating the second battery unit;

the second box body comprises a first wall which is opposite to the opening, the first box body comprises a second wall which is opposite to the opening, the second wall comprises a first part corresponding to the first accommodating space and a second part corresponding to the second accommodating space, the distance between the second part and the first wall is larger than that between the first part and the first wall, and the size of the second battery unit is larger than that of the first battery unit along the thickness direction of the first wall.

2. The battery of claim 1, wherein the battery further comprises:

at least one accommodating shell which is arranged in the box body and divides the box body into at least one first accommodating space, wherein a third accommodating space is arranged in the accommodating shell; the method comprises the steps of,

and the third battery cell is arranged in the third accommodating space.

3. The battery of claim 2, wherein the second wall further comprises a third portion corresponding to the receiving case,

wherein a distance between the third portion and the first wall is smaller than a distance between the first portion and the first wall, and a size of the third battery cell is smaller than a size of the first battery cell in a thickness direction of the first wall; and/or the number of the groups of groups,

the distance between the third portion and the first wall is smaller than the distance between the second portion and the first wall, and the size of the third battery cell is smaller than the size of the second battery cell along the thickness direction of the first wall.

4. The battery of claim 3, wherein the battery comprises a first battery cell stack comprising a plurality of the first battery cells in parallel and a third battery cell stack comprising a plurality of the third battery cells in parallel, the first battery cell stack being in series with the third battery cell stack.

5. The battery of claim 3 or 4, wherein the chemical systems of the first cell and the third cell are different.

6. The battery of claim 5, wherein the first cell is a cell of a lithium iron phosphate material and/or the third cell is a cell of a ternary material.

7. A battery according to any one of claims 1 to 3, wherein the battery comprises a first battery cell group comprising a plurality of the first battery cells in parallel and a second battery cell group comprising a plurality of the second battery cells in parallel, the first battery cell group being in series with the second battery cell group.

8. The battery of claim 7, wherein the capacity of the second battery cell stack is Cap2 and the capacity of the first battery cell stack is Cap1, cap2 being greater than or equal to Cap1.

9. A battery according to any one of claims 1 to 3, wherein a projected area of the second portion is smaller than a projected area of the first portion in a thickness direction of the first wall.

10. An electricity consumption device, characterized in that it comprises a battery according to any one of claims 1 to 9 for providing electrical energy to the electricity consumption device.