Battery monomer, battery pack and electric equipment

Abstract

The utility model relates to a battery monomer, a battery pack and electric equipment, comprising: a housing which is provided with an accommodating cavity and is provided with at least two first terminals with the same polarity; the plurality of battery cell groups are arranged in the accommodating cavity; the plurality of battery cell groups at least comprise two different types of battery cell groups, and each type of battery cell group comprises a first tab group with the same polarity as the first terminal; the number of the first terminals is equal to the type number of the battery cell groups, and the first tab groups of the multiple types of battery cell groups are electrically connected with the multiple first terminals in a one-to-one correspondence manner. By arranging different types of battery cell groups, the battery monomers are endowed with the capability of being suitable for different scenes, so that the possibility is provided for subsequently manufacturing the battery pack capable of being suitable for different scenes, and the use is more flexible.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile battery technology field especially is involved in a kind of battery monomer, battery package and electric equipment. BACKGROUND

[0002] Most of the current vehicle conditions are urban road conditions, daytime vehicle use, nighttime return charging, occasional long-distance driving requires fast charging, that is, most of the time only slow charging is used, and fast charging is used in a small number of emergency situations, and a small number of requirements increase the overall cost of the battery, which is not worth the loss. Therefore, on the one hand, consumers need the fast charging capability of the battery to avoid range anxiety, and on the other hand, consumers do not want fast charging to increase the cost of the battery system, reduce the service life, increase the risk of safety, and increase the cost of charging. The present application aims to solve the above conflicts and achieve a balance point that consumers can easily accept. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a battery monomer, battery package and electric equipment that increase battery life and reduce cost.

[0004] The technical solution adopted by the utility model to solve its technical problem is:

[0005] A battery monomer comprises:

[0006] A housing has a receiving cavity, and the housing is provided with at least two first terminals with the same polarity;

[0007] A plurality of said battery cell groups are arranged in the receiving cavity; the plurality of battery cell groups comprise at least two types of battery cell groups, each type of battery cell group comprises a first tab group with the same polarity as the first terminal; the number of first terminals is equal to the number of types of battery cell groups, and the first tab groups of the plurality of types of battery cell groups and the plurality of first terminals are electrically connected one by one.

[0008] Further specifically, it further comprises at least two types of electrolyte, the housing has at least two receiving cavities that are not connected to each other, the number of receiving cavities is equal to the number of types of battery cell groups, and the plurality of types of battery cell groups are accommodated in all receiving cavities one by one; the number of receiving cavities is equal to the number of types of electrolyte, and the plurality of types of electrolyte are accommodated in all receiving cavities one by one.

[0009] Further specifically, each type of battery cell group comprises an encapsulation bag made of aluminum plastic film and electrolyte accommodated in the encapsulation bag, wherein the types of electrolyte in different types of battery cell groups are different.

[0010] Further, the shell is provided with at least two second terminals with the same polarity, the polarity of the first terminal and the second terminal is opposite; each type of the battery cell group further comprises a second tab group with the same polarity as the second terminal; the number of the second terminals is equal to the number of the types of the battery cell groups, and the second tab groups of the battery cell groups of the multiple types and the multiple second terminals are electrically connected one by one.

[0011] Further, the shell is provided with at least two second terminals with the same polarity, the polarity of the first terminal and the second terminal is opposite; each type of the battery cell group further comprises a second tab group with the same polarity as the second terminal; the number of the second terminals is equal to the number of the types of the battery cell groups, and the second tab groups of the battery cell groups of the multiple types and the multiple second terminals are electrically connected one by one.

[0012] Further, the shell is provided with at least two second terminals with the same polarity, the polarity of the first terminal and the second terminal is opposite; each type of the battery cell group further comprises a second tab group with the same polarity as the second terminal; the number of the second terminals is equal to the number of the types of the battery cell groups, and the second tab groups of the battery cell groups of the multiple types and the multiple second terminals are electrically connected one by one.

[0013] Further, the shell is provided with at least two second terminals with the same polarity, the polarity of the first terminal and the second terminal is opposite; each type of the battery cell group further comprises a second tab group with the same polarity as the second terminal; the number of the second terminals is equal to the number of the types of the battery cell groups, and the second tab groups of the battery cell groups of the multiple types and the multiple second terminals are electrically connected one by one.

[0014] Further, the shell is provided with at least two second terminals with the same polarity, the polarity of the first terminal and the second terminal is opposite; each type of the battery cell group further comprises a second tab group with the same polarity as the second terminal; the number of the second terminals is equal to the number of the types of the battery cell groups, and the second tab groups of the battery cell groups of the multiple types and the multiple second terminals are electrically connected one by one.

[0015] Further, the shell is provided with at least two second terminals with the same polarity, the polarity of the first terminal and the second terminal is opposite; each type of the battery cell group further comprises a second tab group with the same polarity as the second terminal; the number of the second terminals is equal to the number of the types of the battery cell groups, and the second tab groups of the battery cell groups of the multiple types and the multiple second terminals are electrically connected one by one.

[0016] Alternatively, the first battery cell has a first tab and a second tab, the second battery cell has a third tab and a fourth tab, the width of the first tab is greater than 1.2 times the width of the third tab, and the width of the second tab is greater than 1.2 times the width of the fourth tab;

[0017] Alternatively, the first battery cell includes a first positive electrode, a first negative electrode, and a first separator, and the second battery cell includes a second positive electrode, a second negative electrode, and a second separator. The second negative electrode is made of graphite material improved by secondary granulation and carbon coating process, or is made of lithium titanate material, or is made of silicon-carbon material; the first negative electrode is made of graphite material.

[0018] A battery pack comprising the aforementioned battery cells.

[0019] An electrical device comprising the aforementioned battery pack.

[0020] The beneficial effects of this utility model are: by setting different types of cell groups, the battery cells are endowed with the ability to be used in different scenarios, which makes it possible to subsequently manufacture battery packs that can be adapted to different scenarios, making them more flexible in use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery cell of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of a second embodiment of the battery cell of this utility model;

[0023] Figure 3 This is a schematic diagram of the assembly of the battery cell assembly and the housing of this utility model;

[0024] Figure 4 This is a cross-sectional structural diagram of the battery cell structure of this utility model;

[0025] Figure 5 yes Figure 4 Enlarged structural diagram of part A in the middle;

[0026] Figure 6 This is a schematic diagram of the structure of the battery pack of this utility model.

[0027] In the figure: 10, shell; 20, battery cell group; 21, first type battery cell group; 22, second type battery cell group; 31, first pole; 32, second pole; 41, third pole; 42, fourth pole; 43, fifth pole; 51, first pole lug; 52, third pole lug; 61, second pole lug; 62, fourth pole lug; 71, insulating plate; 72, cover plate; 73, plastic plate; 74, rivet; 741, center column body; 742, connecting disc; 75, sealing ring; 76, rivet block; 77, partition plate; 78, first buckling part; 79, second buckling part. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0031] The present application provides a battery monomer and a battery pack composed of the battery monomer in series or parallel, so as to adapt to the needs of fast charging or slow charging in actual use, and will not affect the service life of the battery, and also reduces the cost of the battery.

[0032] As Figure 1 - Figure 3The battery cell shown includes a shell 10 and a plurality of cell groups 20, the shell 10 has a receiving cavity inside, the shell 10 is provided with at least two first terminals with the same polarity; a plurality of cell groups 20 are arranged in the receiving cavity; a plurality of cell groups 20 include at least two different types of cell groups 20, each type of cell group 20 includes a first tab group with the same polarity as the first terminal; the number of first terminals is equal to the number of types of cell groups 20, and the first tab groups of the plurality of types of cell groups 20 and the plurality of first terminals are electrically connected one by one.

[0033] It can be understood that the receiving cavity of the shell 10 is a closed space. The cell group 20 is provided with at least two, and at least two types, for example, the cell group 20 is provided with three, two cell groups 20 are consistent in type and are first type cell groups 21, and the remaining one cell group 20 is a second type cell group 22, and for example, the cell group 20 is provided with three, the types of the three cell groups 20 are different, which are first type cell groups 21, second type cell groups 22 and third type cell groups. The number of first terminals is the same as the number of types of cell groups 20, and the polarity of all first terminals is the same, the polarity of the first tab group is the same as the polarity of the first terminal, the first tab group of the same type of cell group 20 is electrically connected with the same first terminal, and the first tab group of the different type of cell group 20 is electrically connected with the different first terminal, for example, the cell group 20 is provided with two types, which are first type cell groups 21 and second type cell groups 22, and the first terminal is provided with two, which are first pole 31 and second pole 32, the first tab group of the first type cell group 21 is electrically connected with the first pole 31, and the first tab group of the second type cell group 22 is electrically connected with the second pole 32.

[0034] In this application, different types of cell groups 20 are placed in the receiving cavity of the shell 10, that is, a plurality of types of cell groups 20 that can be used in different scenarios are placed in the same shell 10, so that the battery cell produced has the ability to adapt to different scenarios, providing the possibility of making a battery pack that can adapt to different scenarios for use, and using more flexibly.

[0035] Because different electrolytes have different effects under different charging methods, in order to adapt to the needs of different types of cells, different types of electrolytes can be placed in the shell.

[0036] Specifically, each type of cell group 20 includes an aluminum-plastic film packaging bag and electrolyte contained in the packaging bag, and the types of electrolyte in different types of cell groups 20 are different.

[0037] It can be understood that the number of packaging bags is the same as the number of types of battery cell groups 20, and the number of types of electrolytes is the same as the number of types of battery cell groups 20. The battery cell group 20 includes at least one battery cell, all battery cells of the same type are arranged in the same packaging bag, and the electrolyte is injected into the packaging bag. Battery cells of different types are arranged in different packaging bags, and the types of electrolytes in different packaging bags are also different. For example, three battery cell groups 20 are arranged and there are two types, that is, two battery cell groups 20 are first type battery cell groups 21, and one battery cell group 20 is a second type battery cell group 22. Two packaging bags are arranged, and there are two types of electrolytes, which are respectively accommodated in the two packaging bags. In the two packaging bags, one packaging bag accommodates two first type battery cell groups 21, and the other packaging bag accommodates a second type battery cell group 22.

[0038] Alternatively, the shell 10 has at least two accommodation cavities that are not in communication with each other. The number of accommodation cavities is equal to the number of types of battery cell groups 20, and the battery cell groups 20 of the plurality of types are correspondingly accommodated in all the accommodation cavities. The number of accommodation cavities is equal to the number of types of electrolytes, and the electrolytes of the plurality of types are correspondingly accommodated in all the accommodation cavities.

[0039] It can be understood that the shell 10 has a plurality of accommodation cavities that are not in communication with each other. The number of accommodation cavities is equal to the number of types of battery cell groups and equal to the number of types of electrolytes. For example, there are two types of battery cell groups, two accommodation cavities are arranged, and there are two types of electrolytes. The battery cell groups of the two types are arranged in the two accommodation cavities, and the electrolytes of the two types are arranged in the two accommodation cavities.

[0040] In the embodiment, by arranging the battery cell groups 20 of different types to cooperate with the electrolytes of different types, and the electrolytes of different types do not interfere with each other, the same battery cell can work in different use scenarios.

[0041] In order for the battery cell to be able to be controlled differently in different use scenarios, one is that the shell 10 further comprises at least two second terminals with the same polarity, and the polarity of the first terminal and the second terminal is opposite. Each type of battery cell group 20 further includes a second tab group with the same polarity as the second terminal. The number of second terminals is equal to the number of types of battery cell groups 20, and the second tab groups of the plurality of types of battery cell groups 20 and the plurality of second terminals are one-to-one electrically connected.

[0042] It can be understood that the number of second terminals is the same as the number of first terminals, and the number of second terminals is the same as the number of types of battery cell groups.

[0043] Alternatively, the shell 10 is further provided with a second terminal, the polarity of the second terminal being opposite to that of the first terminal; each type of the battery cell group 20 further comprises a second tab group with the same polarity as the second terminal; and the second tab groups of all types of the battery cell group 20 are electrically connected with the second terminal.

[0044] It can be understood that the number of the first terminals is the same as the number of the types of the battery cell groups, and one second terminal is provided.

[0045] The application will be implemented more specifically by showing the following embodiments.

[0046] As an embodiment of the application, the plurality of battery cell groups 20 comprises two different types of battery cell groups 20, which are respectively a first type of battery cell group 21 and a second type of battery cell group 22; the first type of battery cell group 21 comprises at least one first battery cell, and the second type of battery cell group 22 comprises at least one second battery cell, wherein the first battery cell comprises a first tab 51 and a second tab 61, and the second battery cell comprises a third tab 52 and a fourth tab 62; when one first battery cell and one second battery cell are provided, the first tab 51 of the first battery cell is the first tab group of the first type of battery cell group 21, the second tab 61 of the first battery cell is the second tab group of the first type of battery cell group 21, the third tab 52 of the second battery cell is the first tab group of the second type of battery cell group 22, and the fourth tab 62 of the second battery cell is the second tab group of the second type of battery cell group 22; and when a plurality of first battery cells and a plurality of second battery cells are provided, the first tabs 51 of all the first battery cells are the first tab group of the first type of battery cell group 21, the second tabs 61 of all the first battery cells are the second tab group of the first type of battery cell group 21, the third tabs 52 of all the second battery cells are the first tab group of the second type of battery cell group 22, and the fourth tabs 62 of all the second battery cells are the second tab group of the second type of battery cell group 22.

[0047] As an embodiment of the application, the first type of battery cell group 21 and the second type of battery cell group 22 are used in different scenarios, so they can be distinguished by capacity; the capacity of the first battery cell is smaller than that of the second battery cell, that is, the low-capacity first battery cell is used to adapt to subsequent fast charging, and the high-capacity second battery cell is used to adapt to subsequent slow charging; specifically, in the case that the use of the electrical equipment is not urgent, the high-capacity second battery cell is fully charged by using the slow charging technology, which can meet the demand for high endurance capability and the demand for high safety and long service life; and in the case that the high-capacity second battery cell is insufficient and the use of the electrical equipment is urgent, the low-capacity first battery cell can be fully charged by using the fast charging technology, and the high-capacity second battery cell can be charged by using the slow charging technology at the same time, which can meet the demand for fast charging to supply power and can also give the high-capacity second battery cell more charging time.

[0048] In addition, it is known that if the same battery cell is charged by using both fast charging technology and slow charging technology, the service life of the battery cell will be affected, therefore, by distinguishing the first battery cell for charging by using fast charging technology and the second battery cell for charging by using slow charging technology in the battery, the service life of the whole battery can be increased, so that the battery will not decay too fast.

[0049] It should be noted that, as shown in Figure 3 In order to improve the heat dissipation efficiency of the first battery cell and better adapt to fast charging, the first battery cell can be designed to be attached to the second battery cell, so that the second battery cell can take away part of the heat generated by charging the first battery cell by using fast charging technology, and the first battery cell can also be designed to be attached to the large side of the shell of the battery monomer, so that the heat can be taken away by the large surface cooling in the battery pack.

[0050] Here, the first type battery cell group 21 can include one or two or three first battery cells, and the second type battery cell group 22 can include one or two or three second battery cells.

[0051] As an embodiment of the utility model, because different electrolytes have different effects under different charging methods, in order to adapt to the needs of different types of battery cells, two different electrolytes can be arranged in the shell 10.

[0052] Specifically, one is that the shell 10 has two non-communicating accommodation cavities, the first type battery cell group 21 and the second type battery cell group 22 are respectively accommodated in the two accommodation cavities, and the first electrolyte and the second electrolyte are respectively accommodated in the two accommodation cavities. For example, the first electrolyte and the first type battery cell group 21 are arranged in the first accommodation cavity, and the second electrolyte and the second type battery cell group 22 are arranged in the second accommodation cavity.

[0053] The other is that the first type battery cell group 21 includes a first battery cell, a first electrolyte and a first packaging bag, the first packaging bag is made of an aluminum plastic film, and at least one first battery cell and first electrolyte are accommodated in the first packaging bag; the second type battery cell group 22 includes a second battery cell, a second electrolyte and a second packaging bag, the second packaging bag is also made of an aluminum plastic film, and at least one second battery cell and second electrolyte are accommodated in the second packaging bag; the first packaging bag and the second packaging bag are arranged in the shell 10.

[0054] It should be noted that the first type battery cell group 21 is used for fast charging, and the second type battery cell group 22 is used for slow charging; the first electrolyte should have a faster ion transmission speed than the second electrolyte, so the first electrolyte is prepared from high-purity organic solvents, electrolyte lithium salt and additives, the electrolyte lithium salt is selected as lithium hexafluorophosphate, and the performance can be changed by changing the additives, such as increasing the conductivity agent and anti-dendrite.

[0055] In addition, the first electrolyte needs to be designed to have the following properties: 1. The first electrolyte has high conductivity and large diffusion coefficient in a wide range of lithium salt concentration; 2. The first electrolyte has low lithium ion desolvation energy; 3. The first electrolyte has low surface tension and low viscosity, and has good wettability; 4. The first electrolyte has stable SEI film formation and small internal resistance; 5. The first electrolyte can effectively reduce concentration polarization; 6. The first electrolyte has good compatibility with thick electrode sheets; 7. The first electrolyte can effectively inhibit lithium dendrites.

[0056] As an embodiment of the utility model, in order to make the first type battery cell group 21 better suitable for fast charging technology, and make the second type battery cell group 22 better suitable for slow charging technology, in the aspect of battery cell thickness, as shown in the figure, Figure 3 The thickness of the first battery cell is less than the thickness of the second battery cell, wherein the thickness of the first battery cell is h1, the thickness of the second battery cell is h2, and 60%≤h2 / (h1+h2)≤90% is required, preferably 65%≤h2 / (h1+h2)≤85%, and specifically the ratio of h2 / (h1+h2) can be 62% or 66% or 72% or 75% or 78% or 83% or 86% or 88%.

[0057] In the aspect of electrode sheet, the first battery cell includes a first positive electrode sheet, a first negative electrode sheet and a first separator, and the second battery cell includes a second positive electrode sheet, a second negative electrode sheet and a second separator, wherein the thickness of the first positive electrode sheet is less than the thickness of the second positive electrode sheet, and the thickness of the first negative electrode sheet is less than the thickness of the second negative electrode sheet; Specifically in the present application, the thickness of the first positive electrode sheet is 0.171mm, the thickness of the second positive electrode sheet is 0.182mm, the thickness of the first negative electrode sheet is 0.122mm, and the thickness of the second negative electrode sheet is 0.127mm.

[0058] In the aspect of electrode tab, as shown in the figure, Figure 3 The first battery cell has a first tab 51 and a second tab 61, and the second battery cell has a third tab 52 and a fourth tab 62, wherein the width of the first tab 51 is greater than 1.2 times the width of the third tab 52, and the width of the second tab 61 is greater than 1.2 times the width of the fourth tab 62; for improving the overcurrent and heat dissipation capacity of the first type battery cell group 21; Specifically in the present application, the first tab 51 and the third tab 52 are both positive tabs, and the second tab 61 and the fourth tab 62 are both negative tabs.

[0059] In the aspect of electrode sheet material, since the negative electrode sheet is the place where lithium ions are embedded after being removed from the positive electrode sheet, factors such as ion transport channels, particle morphology and orientation inside the negative electrode sheet will affect the fast charging performance, so the negative electrode sheet is a key link to improve the fast charging performance.

[0060] The material of the negative plate needs to have good electron and ion conductivity to quickly transmit electric charges and ions during fast charging; the surface structure of the negative plate needs to have good porosity and specific surface area to quickly adsorb and release electrolyte ions during fast charging, and also needs to have low resistance and good electrochemical stability to ensure stability and durability during fast charging; and the quality and purity of the material also need to be strictly controlled to ensure stability and safety during fast charging.

[0061] The charging speed of the graphite negative electrode material is limited by its layered structure, so that the lithium ion channel may be blocked during fast charging, resulting in a decrease in charging efficiency, and the fast charging performance of the graphite can be improved by secondary granulation and carbon coating processes; the lithium titanate negative electrode material is a new type of negative electrode material with high energy density and good cycle life, and during fast charging, the lithium titanate negative electrode material can quickly absorb and release lithium ions, and its structure is stable and is not prone to lithium precipitation; the silicon-carbon composite material is a new type of negative electrode material with high energy density and good electrochemical performance, and during fast charging, the silicon-carbon composite material can quickly absorb and release lithium ions, and its structure is stable and is not prone to lithium precipitation.

[0062] Therefore, in terms of the negative plate material of the battery cell, the second negative plate is made of graphite material improved by secondary granulation and carbon coating processes, or made of lithium titanate material, or made of silicon-carbon material; and the first negative plate is made of graphite material.

[0063] As an embodiment of the utility model, as shown in Figure 2 In order to realize charging the first battery cell by using fast charging technology and charging the second battery cell by using slow charging technology, the cover plate 72 is provided with a first pole 31, a second pole 32, a third pole 41 and a fourth pole 42, the first pole 31 and the second pole 32 are of the same polarity and are both positive poles, the first pole 31 and the third pole 41 are of opposite polarity, the third pole 41 and the fourth pole 42 are of the same polarity and are both negative poles, the first tab 51 of the first battery cell is electrically connected with the first pole 31, the second tab 61 of the first battery cell is electrically connected with the third pole 41, the third tab 52 of the second battery cell is electrically connected with the second pole 32, and the fourth tab 62 of the second battery cell is electrically connected with the fourth pole 42, so that the fast charging system and the slow charging system can charge the first battery cell and the second battery cell respectively.

[0064] As an embodiment of the utility model, as shown in Figure 1As shown, the cover plate 72 is provided with the first pole 31, the second pole 32 and the fifth pole 43, the first pole 31 and the second pole 32 are positive poles with the same polarity, the first pole 31 and the fifth pole 43 are opposite in polarity, the fifth pole 43 is a negative pole, the first tab 51 of the first battery cell is electrically connected with the first pole 31, the second tab 61 of the first battery cell is electrically connected with the fifth pole 43, the third tab 52 of the second battery cell is electrically connected with the second pole 32, and the fourth tab 62 of the second battery cell is electrically connected with the fifth pole 43.

[0065] As an embodiment of the utility model, Figure 4 With Figure 5 As shown, the first pole 31, the second pole 32, the third pole 41, the fourth pole 42 and the fifth pole 43 are the same structure, all including rivet 74 and rivet block 76, the battery monomer further includes sealing ring 75, plastic plate 73 and insulating plate 71, rivet 74 is connected with rivet block 76 after passing through insulating plate 71, cover plate 72 and plastic plate 73 in sequence, wherein, the sealing ring 75 is sleeved on the outside of rivet 74, and the sealing ring 75 is limited between the cover plate 72 and rivet 74.

[0066] Need to be explained, the rivet 74 includes center column 741 and contact disc 742 formed by the center column 741 one end in radial direction, the contact disc 742 is electrically connected with the tab, and the insulating plate 71 is insulated with the contact disc 742 and the cover plate 72.

[0067] As an embodiment of the utility model, the battery monomer further includes the baffle 77, the baffle 77 is arranged on the side of the insulating plate 71 away from the cover plate 72, the insulating plate 71 and the baffle 77 are stacked, and the insulating plate 71 and the baffle 77 are located on the both sides of the contact disc 742 respectively, a plurality of mounting holes for mounting the pole are arranged on the insulating plate 71, a first buckling part 78 is arranged between the adjacent two mounting holes on the insulating plate 71, a second buckling part 79 is arranged at the position corresponding to the first buckling part 78 on the baffle 77, and the baffle 77 and the insulating plate 71 are connected by the first buckling part 78 and the second buckling part 79 in the form of clamping; the first buckling part 78 of the application is a clamping claw, and the second buckling part 79 is a clamping groove.

[0068] Wherein, on the one hand, the baffle 77 can play the role of stop, that is, the baffle 77 is abutted against the first type battery cell group 21 and the second type battery cell group 22, to prevent the first type battery cell group 21 and the second type battery cell group 22 from moving; on the other hand, the baffle 77 can play the role of preventing the tab from being inserted reversely, so that the tab can be bent around the baffle 77.

[0069] It should be noted that the insulating plate 71 can be a whole, with all the poles set on the insulating plate 71. Alternatively, the insulating plate 71 can be divided into multiple parts as needed, with each pole corresponding to one insulating plate 71, or poles with the same polarity corresponding to one insulating plate 71. Similarly, the plastic plate 73 and the partition 77 can also be set as needed, in a similar manner to the insulating plate 71, and will not be described in detail here.

[0070] Based on the above-mentioned battery cells, such as Figure 6 The diagram shows how multiple battery cells can be connected in series to form a battery pack. The battery pack contains N battery cells, where the negative terminal of the i-th battery cell is electrically connected to the positive terminal of the (i+1)-th battery cell. N ≥ 2, 1 ≤ i < N, and i and N are both positive integers. The battery pack is guaranteed to have two positive terminals and two negative terminals for output.

[0071] To further ensure heat dissipation, a liquid cooling component can be provided on the housing 10 corresponding to the first type of cell group 21. When the battery pack is composed of N battery cells connected in series or in parallel, the first type of cell group 21 in the (2n-1)th battery cell is arranged close to the first type of cell group 21 in the 2nth battery cell, where N≥2, 1≤n≤N / 2, and n and N are both positive integers. A liquid cooling component is provided between the (2n-1)th battery cell and the 2nth battery cell.

[0072] One embodiment of this electrical device includes the aforementioned battery pack. The aforementioned electrical device can be a car, mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool, etc. Cars can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the aforementioned electrical device.

[0073] In summary, by setting two different types of battery cell groups 20, the fast charging function and the slow charging function are realized, the cost of the battery is reduced under the same battery capacity, the overall life of the battery is increased, so that the battery does not decay quickly; when fast charging, the heat absorption of other types of battery cell groups 20 is beneficial to the heat dissipation of fast charging; at the same time, the liquid cooling assembly is arranged on the side of the fast charging battery cell group 20, the heat dissipation effect is improved, and the volume utilization rate of the system is improved; when the fast charging battery cell group 20 is damaged, the use of the slow charging battery cell group 20 is not affected, and when repairing, only the corresponding fast charging battery cell group 20 can be replaced.

[0074] It should be emphasized that: the above is only a preferred embodiment of the present application, and does not limit the present application in any form, any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. A battery cell, characterized by, The application relates to a battery pack, comprising: a shell (10) provided with a plurality of accommodating cavities, the shell (10) being provided with at least two first terminals with the same polarity; a plurality of battery cell groups (20) arranged in the accommodating cavities; the plurality of battery cell groups (20) comprise at least two types of battery cell groups (20), each type of the battery cell groups (20) comprising a first tab group with the same polarity as the first terminal; the number of the first terminals is equal to the number of the types of the battery cell groups (20), and the first tab groups of the plurality of types of the battery cell groups (20) are electrically connected to the plurality of first terminals one by one.

2. The battery cell of claim 1, wherein, The application further comprises at least two types of electrolyte, the shell (10) being provided with at least two accommodating cavities which are not communicated with each other, the number of the accommodating cavities being equal to the number of the types of the battery cell groups (20), and the plurality of types of the battery cell groups (20) are accommodated in the accommodating cavities one by one; the number of the accommodating cavities is equal to the number of the types of the electrolyte, and the plurality of types of the electrolyte are accommodated in the accommodating cavities one by one.

3. The battery cell of claim 1, wherein, Each type of the battery cell groups (20) comprises an encapsulating bag made of an aluminum plastic film and electrolyte accommodated in the encapsulating bag, wherein the types of the electrolyte in the different types of the battery cell groups (20) are different.

4. The battery cell of claim 1, wherein, The shell (10) is further provided with at least two second terminals with the same polarity, the polarity of the first terminals and the second terminals being opposite; each type of the battery cell groups (20) further comprises a second tab group with the same polarity as the second terminal; The number of the second terminals is equal to the number of the types of the battery cell groups (20), and the second tab groups of the plurality of types of the battery cell groups (20) are electrically connected to the plurality of second terminals one by one.

5. The battery cell of claim 1, wherein, The shell (10) is further provided with one second terminal, the polarity of the second terminal and the first terminal being opposite; each type of the battery cell groups (20) further comprises a second tab group with the same polarity as the second terminal; the second tab groups of all types of the battery cell groups (20) are electrically connected to the second terminal.

6. The battery cell of claim 1, wherein, The application further comprises an insulating plate (71) and a partition plate (77), the shell (10) comprising a first wall provided with the first terminals, the insulating plate (71) being arranged on the side of the first wall facing the battery cell groups (20) and connected to the first wall; the insulating plate (71) is provided with a plurality of mounting holes, a first buckling part (78) being arranged on the insulating plate (71) and located between two adjacent mounting holes; the partition plate (77) is arranged on the side of the insulating plate (71) facing the battery cell groups (20), wherein a second buckling part (79) is arranged on the partition plate (77) and corresponds to the position of the first buckling part (78), and the second buckling part (79) is clamped with the corresponding first buckling part (78).

7. The battery cell according to any one of claims 1 to 6, characterized in that, The plurality of cell groups (20) include two different types of cell groups (20), which are a first type of cell group (21) and a second type of cell group (22); the two first terminals are a first pole (31) and a second pole (32); the first tab group of the first type of cell group (21) is electrically connected to the first pole (31), and the first tab group of the second type of cell group (22) is electrically connected to the second pole (32).

8. The battery cell of claim 7, wherein, The first type of cell group (21) includes at least one first cell, and the second type of cell group (22) includes at least one second cell; the capacity of the first cell is less than the capacity of the second cell; Alternatively, the thickness of the first cell is less than the thickness of the second cell, the thickness of the first cell is h1, and the thickness of the second cell is h2, 60%≤h2 / (h1+h2)≤90%; the first cell includes a first positive plate, a first negative plate, and a first separator, and the second cell includes a second positive plate, a second negative plate, and a second separator; the thickness of the first positive plate is less than the thickness of the second positive plate, and the thickness of the first negative plate is less than the thickness of the second negative plate; Alternatively, the first cell has a first tab (51) and a second tab (61), and the second cell has a third tab (52) and a fourth tab (62); the width of the first tab (51) is greater than 1.2 times the width of the third tab (52), and the width of the second tab (61) is greater than 1.2 times the width of the fourth tab (62); Alternatively, the first cell includes a first positive plate, a first negative plate, and a first separator, and the second cell includes a second positive plate, a second negative plate, and a second separator; the second negative plate is made of a graphite material improved by a secondary granulation and carbon coating process, or made of a lithium titanate material, or made of a silicon-carbon material; and the first negative plate is made of a graphite material.

9. A battery pack, characterized by, The battery cell of any one of claims 1 to 8.

10. An electric device, characterized by The battery pack of claim 9.

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