CN214848762U - Electricity core subassembly, battery module and battery package - Google Patents
Electricity core subassembly, battery module and battery package Download PDFInfo
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- CN214848762U CN214848762U CN202120093205.4U CN202120093205U CN214848762U CN 214848762 U CN214848762 U CN 214848762U CN 202120093205 U CN202120093205 U CN 202120093205U CN 214848762 U CN214848762 U CN 214848762U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides an electric core assembly, a battery module and a battery pack, wherein the electric core assembly comprises an electric core monitoring unit and an electric core, a first input end of the electric core monitoring unit is electrically connected with a positive electrode of the electric core, and a second input end of the electric core monitoring unit is electrically connected with a negative electrode of the electric core; the battery cell monitoring unit receives the electric signal transmitted by the battery cell; and a voltage acquisition module is integrated in the battery cell monitoring unit, receives the electric signal and outputs a battery cell voltage value corresponding to the electric signal. Above scheme has reduced the pencil and has used, avoids the interference to voltage detection, has removed the battery management module to the concentrated monitoring of module level from simultaneously, has practiced thrift the inner space of battery module, and the space of saving is used for more reasonable arranging electric core, and the battery module or the battery package that obtain from this have higher energy density and bigger electric capacity.
Description
Technical Field
The application belongs to the technical field of power battery, specifically relates to an electric core subassembly, battery module and battery package.
Background
In recent years, new energy automobiles, especially electric automobiles, have been rapidly developed. The electric vehicle uses a power battery as a power source, each battery module or a plurality of battery modules in a battery pack share one battery management module for monitoring, and the current battery management module mainly has two installation schemes, as shown in fig. 1 and 2:
in the first structure shown in fig. 1, the circuit board 3 of the battery management module 2 is directly installed above the battery cells 1, the circuit board 3 of the battery management module 2 can be directly electrically connected with the positive electrode or the negative electrode of each battery cell 1, although the use of the wire harness is reduced, the use amount of the circuit board 3 is increased, the height of the battery module needs to be increased, a space is reserved for the circuit board 3, the space effective utilization rate of the battery module and the battery pack is reduced, and the energy density of the battery pack is low.
In a second structure shown in fig. 2, a circuit board 3 of a battery management module 2 is disposed at one end of a battery module, and each battery cell 1 is electrically coupled to the circuit board 3 of the battery management module 2 through a wire harness, so that although the height of the battery module is reduced, a plurality of additional wire harnesses are added, and an electric signal passing through the wire harness interferes with the accuracy of the cell voltage; in addition, the transverse dimension of the battery module also needs to be increased to reserve a space for the circuit board 3, so that the space effective utilization rate of the battery module and the battery pack is reduced, and the energy density of the battery pack is low.
Obviously, the low energy density of the battery pack as a power source in the prior art causes the electric quantity value of the battery pack in a full-charge state to be relatively low, which affects the endurance mileage.
Disclosure of Invention
The application aims at providing a battery pack, battery module and battery package to solve the problem that power battery's energy density or electric quantity capacity are lower among the prior art.
Some embodiments of the present application provide a battery pack, including a battery cell monitoring unit and a battery cell, wherein:
a first input end of the battery cell monitoring unit is electrically connected with a positive electrode of the battery cell, and a second input end of the battery cell monitoring unit is electrically connected with a negative electrode of the battery cell; the battery cell monitoring unit receives the electric signal transmitted by the battery cell;
and a voltage acquisition module is integrated in the battery cell monitoring unit, receives the electric signal and outputs a battery cell voltage value corresponding to the electric signal.
In some embodiments of the present application, the battery cell monitoring unit includes a flexible circuit board and a chip circuit disposed on the flexible circuit board, and the flexible circuit board is disposed on the battery cell and has a thickness smaller than a set thickness.
In some embodiments of the present application, the set thickness is: female the arranging of electric core and the distance between the module roof in the battery module.
In some embodiments of the battery cell assembly provided in the present application, a temperature sensing module and/or an internal resistance measuring module are further integrated in the battery cell monitoring unit;
the temperature sensing module receives the electric signal and outputs a battery core temperature value corresponding to the electric signal;
and the internal resistance measuring module receives the electric signal and outputs the electric core internal resistance value corresponding to the electric signal.
In some embodiments of the battery cell assembly provided in the present application, the battery cell monitoring unit is configured with an input interface and an output interface;
the input interface is in communication connection with the output interfaces of other battery cell monitoring units and receives data sent by the output interfaces of the other battery cell monitoring units;
the output interface is used for outputting the cell voltage value, the cell temperature value and/or the cell internal resistance value to input interfaces of different cell monitoring units or a battery management system.
In some embodiments of the battery module provided in the present application, the input interface and the output interface are serial communication interfaces.
In some embodiments of the battery cell assembly provided in the present application, a battery cell balancing module is further integrated in the battery cell monitoring unit;
the battery cell balancing module is connected with the positive end and the negative end of the battery cell through the first input end and the second input end.
There is also provided in some embodiments herein a battery module comprising a plurality of the electric core assembly of any of the above, wherein: a plurality of electric cores in the electric core assembly are connected between the positive terminal and the negative terminal of the battery module after being connected in series.
In some embodiments of the present application, in a cell monitoring unit in each cell assembly, an input interface of the cell monitoring unit is connected to an output interface of a cell monitoring unit in an adjacent previous cell assembly, and an output interface of the cell monitoring unit in an adjacent subsequent cell assembly is connected to an input interface of a cell monitoring unit in the adjacent subsequent cell assembly; the input interface of the cell monitoring unit in the cell component at the head position is suspended; and the output interface of the cell monitoring unit in the cell component at the end position is connected with a battery management system.
Some embodiments of the present application also provide a battery pack including the battery module as set forth in any one of the above.
Compared with the prior art, the above technical scheme provided by the application has the following beneficial effects at least: through for each electric core configuration electric core monitoring unit, utilize integrated voltage acquisition module in the electric core monitoring unit directly to carry out voltage acquisition to the signal of telecommunication of electric core, thereby can carry out real time monitoring to electric core voltage, owing to reduced the pencil and used, avoid the interference to voltage detection, simultaneously because single electric core can independently detect, the battery management module of monitoring is concentrated to the module level has been removed from, can practice thrift the inner space of battery module, saved space is used for more reasonable arrangement electric core, the battery module or the battery package that obtain from this have higher energy density and bigger electric capacity.
Drawings
Fig. 1 is a diagram illustrating an arrangement of a battery management module in a battery module according to the prior art;
fig. 2 is another arrangement of a battery management module in a battery module according to the prior art;
FIG. 3 is a schematic structural diagram of an electrical core assembly according to an embodiment of the present application;
fig. 4 is a block diagram of an internal structure of the cell monitoring unit according to an embodiment of the present application;
fig. 5 is a schematic diagram of a pin connection relationship of the cell monitoring unit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a battery module according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a battery pack according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be further described with reference to the accompanying drawings. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present application, and do not indicate or imply that the device or component being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Some embodiments of the present application provide a battery cell assembly, which is shown in fig. 3 and fig. 4, and includes a battery cell 31 and a battery cell monitoring unit 32, where a first input end of the battery cell monitoring unit 32 is electrically connected to a positive electrode 311 of the battery cell 31, and a second input end of the battery cell monitoring unit 32 is electrically connected to a negative electrode 312 of the battery cell 31; the cell monitoring unit 32 receives the electrical signal transmitted by the cell 31; a voltage acquisition module 321 is integrated in the cell monitoring unit 32, and the voltage acquisition module 321 receives the electrical signal and outputs a cell voltage value corresponding to the electrical signal.
In the above scheme, through configuring electric core monitoring unit 32 for each electric core 31, utilize integrated voltage acquisition module 321 in electric core monitoring unit 32 directly to carry out voltage acquisition to electric signal of electric core 31, thereby can carry out real time monitoring to electric core 31's voltage, obviously, the above-mentioned scheme has reduced the pencil and has used, the interference of pencil electric signal to voltage detection has been avoided, simultaneously because single electric core 31 can independently detect, the battery management module of monitoring is concentrated to the module level has been removed from, can practice thrift the inner space of battery module, saved space is used for more reasonable arrangement electric core, the battery module or the battery package that obtain from this have higher energy density and bigger electric capacity.
The above battery cell monitoring unit 32 may be implemented by any existing chip integrated with a voltage acquisition function, such as a PLC control module integrated with a current sensing element.
In some embodiments, as shown in fig. 4, a temperature sensing module 322 and/or an internal resistance measuring module 323 are further integrated in the cell monitoring unit 32; the temperature sensing module 322 receives the electrical signal and outputs a cell temperature value corresponding to the electrical signal; the internal resistance measurement module 323 receives the electrical signal and outputs a cell internal resistance value corresponding to the electrical signal. The corresponding relationship between the electric core temperature value and the electric signal and the corresponding relationship between the electric core internal resistance value and the electric signal can be determined in advance through a calibration test mode, the electric core internal resistance value and the electric signal are stored in the electric core monitoring unit 32, and the corresponding electric core temperature value and the corresponding electric core internal resistance value can be directly found after the electric signal is detected.
Additionally, in some embodiments, a cell balancing module 324 is further integrated in the cell monitoring unit 32; the cell balancing module 324 is connected to the positive terminal and the negative terminal of the battery cell 31 via the first input terminal and the second input terminal. Along with electric automobile's development, power battery's energy density is higher and higher more, can adopt a plurality of electric cores to concatenate the use from this, and in electric core series connection use, in order to guarantee the uniformity of each electric core monomer voltage, can use voltage equalizer circuit, can adopt in this scheme that existing ripe voltage equalizer circuit integrate to electric core monitor unit 32 can.
In some embodiments, the cell monitoring unit 32 may also be configured with an input interface and an output interface; the input interface is in communication connection with the output interfaces of other battery cell monitoring units and receives data sent by the output interfaces of the other battery cell monitoring units; the output interface is used for outputting the cell voltage value, the cell temperature value and/or the cell internal resistance value to input interfaces of different cell monitoring units or a battery management system. Because the cell assembly in the above-mentioned scheme of the present application is a part used for the battery module, when there are a plurality of cell assemblies in the battery module, the cell monitoring units 32 of adjacent cell assemblies can perform data transmission through the input interface and the output interface. The input interface and the output interface can be in communication connection in a wireless communication mode, or can be selected as serial communication interfaces, and the serial communication interfaces can be connected through only two serial data lines.
For the cell monitoring unit 32, all the functional circuits proposed in the above embodiments of the present application can be implemented by referring to existing circuits in the prior art, such as a voltage acquisition circuit, a temperature sensing circuit, an internal resistance detection circuit, an equalization circuit, and the like. Through being in the same place with above-mentioned circuit integration, change traditional battery module voltage and concentrate the scheme of measuring, adopt the mode of electric core distributed measurement in the module can improve the energy density of battery module and battery package well.
As an implementation solution, the cell monitoring unit 32 may be implemented by using a DNB1168 chip proposed by NXP corporation shown in fig. 5. As shown in the figure, the battery cell 31 is connected between the positive pin and the negative pin of the DNB1168 chip, and the DNB1168 chip has integrated therein a plurality of functions such as a temperature sensor, voltage acquisition, serial communication, battery equalization, internal resistance measurement, etc., so that various parameters of the battery cell connected thereto can be directly detected, and then the battery cell is used as an output interface through the first group of communication pin pins 325, and is used as an input interface through the second group of communication pin pins 326, thereby realizing data transmission between different DNB1168 chips.
In some embodiments, the cell monitoring unit 32 includes a flexible circuit board and a chip circuit disposed on the flexible circuit board, where the flexible circuit board is disposed on the cell 31 and has a thickness smaller than a set thickness, and the set thickness may be selected from a thickness of a common PCB commonly used in the prior art. The chip Circuit can be as shown in fig. 5, and a Flexible Printed Circuit board (FPC for short) is a Flexible Printed Circuit board which is highly reliable and excellent and is made of polyimide or polyester film as a base material, and has the characteristics of high wiring density, light weight, thin thickness and good bending property. Compared with the PCB frequently used by the battery management module in the prior art, the battery management module has the advantage of being lighter and thinner, so that the use space can be further saved.
In some embodiments, the set thicknesses in the above schemes are: female the arranging of electric core and the distance between the module roof in the battery module. The battery module includes the casing, at the inside a plurality of electric core subassemblies that set up of casing, the anodal and the negative pole of different electric cores are in the same place through female the arranging series connection, in order to make the battery module have good thermal diffusivity, can reserve certain space between female row and the module roof and supply steam dissipation, set up the thickness of flexible circuit board for being less than the distance between female row and the module roof on this basis, can utilize the energy density that battery module inner space promoted the battery module well.
Some embodiments of the present application further provide a battery module, as shown in fig. 6, which includes a plurality of the battery cell assemblies according to any of the above aspects, wherein a plurality of the battery cells 31 in the battery cell assemblies are connected in series and then connected between the positive terminal 41 and the negative terminal 42 of the battery module. The positive pole and the negative pole of two adjacent electric cores 31 are directly connected through a wire. In some embodiments, the input interface of the cell monitoring unit in each cell assembly is connected with the output interface of the cell monitoring unit in the adjacent previous cell assembly, and the output interface of the cell monitoring unit in the adjacent next cell assembly is connected with the input interface of the cell monitoring unit in the adjacent next cell assembly; the input interface of the cell monitoring unit in the cell component at the head position is suspended; and the output interface of the cell monitoring unit in the cell component at the end position is connected with a battery management system. As shown in the figure, when the input interface and the output interface are serial communication interfaces, two adjacent battery cell monitoring units 32 are directly connected through two serial data lines 43.
Some embodiments of the present application further provide a battery pack, as shown in fig. 7, including a plurality of battery modules 40 according to the above aspects, where adjacent battery modules are connected in series, the leading battery module is connected to the positive terminal 51 of the battery pack, and the last battery module is connected to the negative terminal 52 of the battery pack.
According to the scheme in the embodiment of the application, the mode of an external sensor is omitted, only 2 wire harnesses are needed to be connected between the battery cell monitoring units 32, the upper space of the battery cell is compressed to the maximum extent, the space does not need to be reserved for the thick circuit board of the battery management module, the space utilization rate in the bag is larger, and the weight is lighter. The energy density of the existing battery pack is in the range of 170Wh/L-180Wh/L, and tests prove that the energy density of the battery pack can be improved by more than 10% under the condition that a chemical system of an electric core is not changed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An electric core assembly, characterized in that, includes electric core monitoring unit and electric core, wherein:
a first input end of the battery cell monitoring unit is electrically connected with a positive electrode of the battery cell, and a second input end of the battery cell monitoring unit is electrically connected with a negative electrode of the battery cell; the battery cell monitoring unit receives the electric signal transmitted by the battery cell;
and a voltage acquisition module is integrated in the battery cell monitoring unit, receives the electric signal and outputs a battery cell voltage value corresponding to the electric signal.
2. The electric core assembly according to claim 1, wherein:
the battery cell monitoring unit comprises a flexible circuit board and a chip circuit arranged on the flexible circuit board, wherein the flexible circuit board is arranged on the battery cell, and the thickness of the flexible circuit board is smaller than the set thickness.
3. The electric core assembly according to claim 2, wherein:
the set thickness is: female the arranging of electric core and the distance between the module roof in the battery module.
4. The electric core assembly according to claim 1, wherein:
a temperature sensing module and/or an internal resistance measuring module are/is integrated in the battery cell monitoring unit;
the temperature sensing module receives the electric signal and outputs a battery core temperature value corresponding to the electric signal;
and the internal resistance measuring module receives the electric signal and outputs the electric core internal resistance value corresponding to the electric signal.
5. The electrical core assembly of claim 4, wherein:
the battery cell monitoring unit is provided with an input interface and an output interface;
the input interface is in communication connection with the output interfaces of other battery cell monitoring units and receives data sent by the output interfaces of the other battery cell monitoring units;
the output interface is used for outputting the cell voltage value, the cell temperature value and/or the cell internal resistance value to input interfaces of different cell monitoring units or a battery management system.
6. The electrical core assembly of claim 5, wherein:
the input interface and the output interface are serial communication interfaces.
7. The electrical core assembly of any one of claims 1-6, wherein:
a battery cell balancing module is integrated in the battery cell monitoring unit;
the battery cell balancing module is connected with the positive end and the negative end of the battery cell through the first input end and the second input end.
8. A battery module comprising a plurality of the electric core assembly of any one of claims 1-7, wherein:
a plurality of electric cores in the electric core assembly are connected between the positive terminal and the negative terminal of the battery module after being connected in series.
9. The battery module according to claim 8, wherein:
the input interface of the cell monitoring unit in each cell assembly is connected with the output interface of the cell monitoring unit in the adjacent previous cell assembly, and the output interface of the cell monitoring unit in the adjacent next cell assembly is connected with the input interface of the cell monitoring unit in the adjacent next cell assembly;
the input interface of the cell monitoring unit in the cell component at the head position is suspended; and the output interface of the cell monitoring unit in the cell component at the end position is connected with a battery management system.
10. A battery pack comprising a plurality of battery modules according to claim 8 or 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120093205.4U CN214848762U (en) | 2021-01-13 | 2021-01-13 | Electricity core subassembly, battery module and battery package |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120093205.4U CN214848762U (en) | 2021-01-13 | 2021-01-13 | Electricity core subassembly, battery module and battery package |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156551A (en) * | 2021-11-26 | 2022-03-08 | 冯凯 | Battery system and control method of battery system |
| CN115436823A (en) * | 2022-10-10 | 2022-12-06 | 深圳市卓讯达科技发展有限公司 | Battery cell testing method and testing equipment |
| CN117175030A (en) * | 2023-07-31 | 2023-12-05 | 深圳市特普生科技有限公司 | Battery module, battery management device and battery management method |
-
2021
- 2021-01-13 CN CN202120093205.4U patent/CN214848762U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156551A (en) * | 2021-11-26 | 2022-03-08 | 冯凯 | Battery system and control method of battery system |
| CN115436823A (en) * | 2022-10-10 | 2022-12-06 | 深圳市卓讯达科技发展有限公司 | Battery cell testing method and testing equipment |
| CN117175030A (en) * | 2023-07-31 | 2023-12-05 | 深圳市特普生科技有限公司 | Battery module, battery management device and battery management method |
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