Battery Pack

Abstract

The present invention provides a battery pack, which relates to the field of battery technology. The battery pack includes a battery module and a BMS mainboard, the battery module includes a plurality of battery cells and a plurality of acquisition modules, the plurality of acquisition modules correspond to the plurality of battery cells one by one, the acquisition module is connected to the battery cells corresponding to the acquisition module in communication to acquire temperature information of the battery cells; the plurality of acquisition modules are connected to the BMS mainboard, and each of the acquisition modules can send the acquired temperature information to the BMS mainboard. The battery pack of this solution can solve the problem that the existing battery pack cannot detect abnormal temperature information in time when thermal runaway occurs.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] With the development of battery technology, the CTP (Cell to Pack) structure came into being. The CTP structure means that the battery pack is formed by assembling the battery cells directly into the shell. This structure eliminates or greatly reduces the intermediate module components, greatly reduces the overall weight of the battery pack, and directly contributes to the lightweight and driving range of electric vehicles.

[0003] In order to monitor the performance of the battery pack, it is generally necessary to collect information such as the voltage and temperature of the battery cells in the battery pack. In the existing battery cell temperature collection, it is generally carried out for the entire battery pack. The battery pack includes a voltage collection line and a temperature collection line. Due to the space limitation of the BMS temperature collection channel, the total number of temperature collection lines and voltage collection lines is limited, which makes the number of temperature collection lines set small, and it is impossible to set a temperature collection line for each battery cell. When a battery cell that is not directly connected to the temperature collection line has thermal runaway, the temperature collection line cannot detect the abnormality of the temperature information in time, and the battery pack has a certain lag in detecting the temperature information. Summary of the invention

[0004] In view of this, the present application provides a battery pack to solve the problem that the existing battery pack cannot detect abnormal temperature information in time when thermal runaway occurs.

[0005] The present application provides a battery pack, the battery pack comprising a battery module and a BMS mainboard, the battery module comprising a plurality of battery cells and a plurality of acquisition modules, the plurality of acquisition modules corresponding to the plurality of battery cells one by one, the acquisition module being communicatively connected with the battery cells corresponding to the acquisition modules to acquire temperature information of the battery cells;

[0006] The multiple acquisition modules are all connected to the BMS mainboard, and each of the acquisition modules can send the collected temperature information to the BMS mainboard.

[0007] Preferably, the battery cell comprises a negative electrode column and a first cover plate, the negative electrode column and the collection module are both arranged on the first cover plate, the multiple battery cells are arranged along a first direction, and in two adjacent battery cells, the two first cover plates included in the two battery cells are located at different ends in a second direction, and the first direction is perpendicular to the second direction;

[0008] The battery module also includes a communication line, the multiple acquisition modules are all connected to the communication line, and the communication line is connected to the BMS mainboard.

[0009] Preferably, the battery module further includes two end plates, which are respectively arranged on both sides of the whole formed by the multiple battery cells in the first direction, and limiting grooves are provided on the two end plates, and part of the communication line is arranged in the limiting grooves.

[0010] Preferably, the communication line comprises a first connecting section, a connecting section and a second connecting section connected in sequence, and the first connecting section and the second connecting section are respectively fixed at two ends of the whole body formed by the plurality of battery cells in the second direction;

[0011] The first connecting section is connected to the acquisition module located on the same side as the first connecting section, and the second connecting section is connected to the acquisition module located on the same side as the second connecting section.

[0012] Preferably, the battery pack comprises a plurality of battery modules, the plurality of battery modules are all connected to the BMS mainboard, and the two communication lines comprised by two adjacent battery modules are connected in series.

[0013] Preferably, the battery module further comprises a module output pole, and the battery cells at the end of the battery module located in the first direction are connected to the module output pole;

[0014] The battery pack also includes a first connecting aluminum bar, and the two module output poles in two adjacent battery modules are connected through the first connecting aluminum bar.

[0015] Preferably, the battery pack also includes a first end beam, which is arranged at one end of the battery module in the first direction, and the position of the first connecting aluminum bar in the third direction is higher than the upper end surface of the first end beam in the third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0016] Preferably, the battery pack also includes two second end beams, the two second end beams are spaced apart along the second direction, the multiple battery modules are arranged between the two second end beams, and the position of any one of the acquisition modules in the third direction is higher than the upper end surface of the second end beam in the third direction.

[0017] Preferably, the battery pack includes a third end beam, the third end beam is located on the side of the first end beam facing away from the battery module, an installation space is formed between the third end beam and the first end beam, and the BMS mainboard is arranged in the installation space.

[0018] Preferably, the acquisition module includes a PCB, an acquisition chip, a temperature sensor, a first connecting bar and a heat conducting part. The temperature sensor and the acquisition chip are both fixed to the PCB, the first end of the first connecting bar is connected to the PCB, the second end of the first connecting bar is connected to the first cover plate, the heat conducting part is attached to the PCB, the heat conducting part is located between the temperature sensor and the first connecting bar, and the temperature sensor is communicatively connected to the acquisition chip.

[0019] In the battery pack of the present application, the battery pack includes a battery module, the battery module includes multiple battery cells and multiple acquisition modules, each battery cell is correspondingly provided with an acquisition module for collecting temperature information, each acquisition module is connected to the BMS mainboard, so that each acquisition module can send the collected temperature information to the BMS mainboard, in this way, the temperature data of each battery cell can be collected, when any battery cell in the battery pack has thermal runaway, the BMS mainboard can promptly detect the temperature information of the battery cell with thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A three-dimensional structural diagram of a battery pack according to an embodiment of the present invention is shown;

[0022] Figure 2 A three-dimensional structural diagram showing a battery module from one perspective;

[0023] Figure 3 A three-dimensional structural diagram showing another perspective of the battery module;

[0024] Figure 4 A plan view showing a partial structure of a battery pack;

[0025] Figure 5 Show Figure 4 A magnified view of part A;

[0026] Figure 6 The diagram shows the relative positions of the battery cell and the acquisition module.

[0027] Icons: 1-battery module; 11-battery cell; 111-first cover plate; 112-negative pole; 12-acquisition module; 121-PCB; 122-acquisition chip; 123-first connecting strip; 124-second connecting strip; 125-temperature sensor; 126-transmitting antenna; 13-end plate; 131-placement slot; 132-limiting slot; 14-communication line; 141-first connecting section; 142-connecting section; 143-second connecting section; 144-fixing section; 15-hot riveting column; 16-second connecting aluminum bar; 17-module output pole; 2-bottom plate; 3-shell; 4-first end beam; 5-second end beam; 6-third end beam; 7-information processing module; 8-first connecting aluminum bar; 9-series connector; L1-first direction; L2-second direction; L3-third direction. DETAILED DESCRIPTION

[0028] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0029] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0030] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0031] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0032] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0033] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0034] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0035] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0036] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0037] The following will be combined Figures 1 to 6The battery pack of the present invention is described. Figures 1 to 6 In the embodiment, the first direction L1, the second direction L2 and the third direction L3 are perpendicular to each other.

[0038] like Figures 1 to 6 As shown, the battery pack includes a battery module 1 and a BMS mainboard ( Figures 1 to 6 (not shown), the battery module 1 includes a plurality of battery cells 11 and a plurality of acquisition modules 12, the plurality of acquisition modules 12 correspond to the plurality of battery cells 11 one by one, the acquisition modules 12 are communicatively connected with the battery cells 11 corresponding to the acquisition modules 12 to collect temperature information of the battery cells 11; the plurality of acquisition modules 12 are all connected to the BMS mainboard, and each acquisition module 12 can send the collected temperature information to the BMS mainboard.

[0039] In the battery pack of the present application, the battery pack includes a battery module 1, the battery module 1 includes multiple battery cells 11 and multiple acquisition modules 12, each battery cell 11 is correspondingly provided with an acquisition module 12 for collecting temperature information, each acquisition module 12 is connected to the BMS mainboard, so that each acquisition module 12 can send the collected temperature information to the BMS mainboard, so that the temperature data of each battery cell 11 can be collected, and when any battery cell 11 in the battery pack has thermal runaway, the BMS mainboard can promptly detect the temperature information of the battery cell with thermal runaway.

[0040] In an embodiment of the present application, the battery cell 11 includes a negative electrode column 112, a positive electrode column, a first cover plate 111, a second cover plate and a shell 3, the first cover plate 111 and the second cover plate are respectively located on both sides of the shell 3 in the second direction L2, the negative electrode column 112 is arranged on the first cover plate 111, and the positive electrode column is arranged on the second cover plate.

[0041] like Figure 1 and Figure 4 As shown, the battery pack may include multiple battery modules 1, and multiple battery cells 11 in each battery module 1 may be arranged along the first direction L1. In two adjacent battery cells 11, the two negative poles 112 included in the two battery cells 11 are respectively located at different ends in the second direction L2, and the collection module 12 is fixed on the first cover plate 111.

[0042] like Figure 6As shown, the acquisition module 12 includes a PCB 121, an acquisition chip 122, a first connecting bar 123, a second connecting bar 124, a temperature sensor 125, a thermal conductive adhesive layer and a transmitting antenna 126. The acquisition chip 122 and the temperature sensor 125 are both fixed to the PCB 121, and a thermal conductive adhesive is coated around the temperature sensor 125 to form a thermal conductive adhesive layer. The first end of the first connecting bar 123 is connected to the PCB 121, and the thermal conductive adhesive layer covers the portion of the PCB 121 located between the first connecting bar 123 and the temperature sensor 125. The second end of the first connecting bar 123 is connected to the first cover plate 111, so that the temperature of the battery cell 11 can be measured through the temperature sensor 125. The temperature sensor 125 is connected to the acquisition chip 122 to send the temperature information to the acquisition chip 122. In addition, the acquisition module 12 also includes a resistor, which is fixed on the PCB 121.

[0043] like Figure 6 As shown, the first end of the second connecting strip 124 is connected to the PCB 121, the second end of the second connecting strip 124 is connected to the negative pole 112 of the battery cell 11, the positive pole of the battery cell 11 is connected to the second cover plate through the third connecting strip, and the acquisition chip 122 can realize the acquisition of the voltage of the positive pole of the battery cell 11 through the first cover plate 111, the second cover plate and the shell 3. The acquisition chip 122 is connected to the transmitting antenna 126, and the collected temperature and voltage information is sent to the BMS mainboard through the transmitting antenna 126 and the communication line 14 described below. Optionally, the communication line 14 is attached to the transmitting antenna 126, so that this acquisition module 12 communicates with the BMS mainboard through NFC wireless induction.

[0044] Optionally, the first connecting bar 123, the second connecting bar 124 and the third connecting bar are all FPC (Flexible Printed Circuit, FPC for short). The acquisition chip 122 is a chip produced by Dukosi for data acquisition of the battery cell 11, so that the acquisition module 12 can realize the acquisition of voltage, temperature and internal resistance information of the battery cell 11.

[0045] Further, as 2 to Figure 4 As shown, the battery module 1 also includes a communication line 14, which includes a first connecting section 141, a connecting section 142 and a second connecting section 143 connected in sequence, the first connecting section 141 and the second connecting section 143 are respectively fixed at two ends of the whole formed by the multiple battery cells 11 in the second direction L2, the first connecting section 141 is connected to the transmitting antenna 126 on the acquisition module 12 located on the same side as the first connecting section 141, the second connecting section 143 is connected to the transmitting antenna 126 on the acquisition module 12 located on the same side as the second connecting section 143, and the connecting section 142 is fixed to one end of the whole formed by the multiple battery cells 11 in the first direction L1.

[0046] Optionally, the communication line 14 further includes a fixed section 144, which is connected to the end of the first connecting section 141 away from the connecting section 142, that is, the communication line 14 can be designed to be lengthened, and the excess part of the communication line 14 can be stored in the limiting groove 132. At this time, the first connecting section 141 is arranged at the first end of the whole body composed of multiple battery cells 11 in the second direction L2, and the second connecting section 143 is arranged at the second end of the whole body composed of multiple battery cells 11 in the second direction L2; the collection modules 12 located on the side of the first end of the whole body composed of multiple battery cells 11 in the first direction L1 are all connected to the first connecting section 141, and the collection modules 12 located on the side of the second end of the whole body composed of multiple battery cells 11 in the first direction L1 are all connected to the second connecting section 143, and the fixed section 144 and the connecting section 142 are respectively located on both sides of the whole body composed of multiple battery cells 11 in the first direction L1.

[0047] Furthermore, in two adjacent battery modules 1, two communication lines 14 are connected in series through a series connector 9. The communication line 14 provided on the battery module 1 at the end of the plurality of battery modules 1 is connected to the information processing module 7, and the information processing module 7 is at a certain distance from the end of the communication line 14, and the end of the communication line 14 is connected to the BMS mainboard.

[0048] Optionally, a BMS mainboard integrated bridge chip may be used, in which case there is no need to separately set up the information processing module 7 .

[0049] Taking a battery pack including two battery modules 1 as an example, the second connecting sections 143 of the two communication lines 14 are connected, the end of the fixed section 144 of one communication line 14 away from the first connecting section 141 is connected to the information processing module 7, and the end of the communication line 14 is connected to the BMS mainboard.

[0050] In the embodiments of the present application, Figure 2 and Figure 3 As shown, the battery module 1 further includes two end plates 13, which are respectively arranged on both sides of the whole body formed by the plurality of battery cells 11 in the first direction L1. The two end plates 13 are provided with limiting grooves 132, and part of the communication line 14 is arranged in the limiting grooves 132. The connecting section 142 and the fixing section 144 are respectively located in the two limiting grooves 132. The length of the connecting section 142 is equal to the length of the limiting groove 132, and the length of the fixing section 144 is less than the length of the limiting groove 132. In two adjacent battery modules 1, the fixing section 144 is located on the same side in the first direction L1.

[0051] like Figure 4 and Figure 5As shown, the battery cell 11 at the end of each battery module 1 is connected to the module output pole 17, and the module output poles 17 in two adjacent modules can be connected through the first connecting aluminum bar 8. Taking the two battery cells 11 at the edge of two adjacent battery modules 1 as an example, the first cover plate 111 of the first battery cell 11 and the second cover plate of the second battery cell 11 face each other, the module output pole 17 of the first battery cell 11 and the module output pole 17 of the second battery cell 11 are located on the same side, and the two module output poles 17 are connected through the first connecting aluminum bar 8.

[0052] In addition, the end plate 13 has placement grooves 131 on both sides in the second direction L2, and the first connecting aluminum bar 8 includes a first part and a second part. The first part is fixed to the first cover plate 111 or the second cover plate of the battery cell 11, and the second part is located in the placement groove 131, and a hot rivet column 15 is arranged in the placement groove 131. The second part can be welded with the hot rivet column 15 to realize the welding fixation of the first connecting aluminum bar 8.

[0053] Furthermore, the battery module 1 also includes a second connecting aluminum bar 16, and two adjacent battery cells 11 are connected by the second connecting aluminum bar 16. The second connecting aluminum bar 16 is located on the lower side of the acquisition chip 122 in the third direction L3. In this way, the communication connection and the electrical connection in the battery pack are separated, which enables the gap between two adjacent battery cells 11 to be adjusted.

[0054] Optionally, two oblong holes are provided on the second connecting aluminum bar 16, and the two oblong holes extend along the second direction L2. By connecting two battery cells 11 to the two oblong holes at different positions in the second direction L2, the gap between two adjacent battery cells 11 can be adjusted. In this case, the communication line 14 needs to be lengthened to meet the requirements of gaps of different sizes between adjacent battery cells 11. The gap between the battery cells 11 can be adjusted, which enables the structure of the battery pack other than the battery module 1 to be platform-based and universal, avoiding repeated design of the battery pack and the electrical system.

[0055] In the embodiments of the present application, Figure 1 As shown, the battery pack includes a bottom plate 2 and a shell 3, and the battery module 1 is arranged between the shell 3 and the bottom plate 2. The battery pack also includes two first end beams 4, both of which are fixed on the bottom plate 2, and the two first end beams 4 are respectively located at both ends in the first direction L1. The position of the first connecting aluminum bar 8 in the third direction L3 is higher than the upper end surface of the first end beam 4 in the third direction L3.

[0056] Furthermore, the battery pack further includes two second end beams 5, the two ends of the second end beams 5 are respectively connected to the two first end beams 4, the two second end beams 5 are spaced apart along the second direction L2, the battery module 1 can be arranged between the two first end beams 4 and the two second end beams 5, and the position of any acquisition module 12 in the third direction L3 is higher than the upper end surface of the second end beam 5 in the third direction L3. In this way, the acquisition module 12 can be easily inspected and repaired.

[0057] In addition, the battery pack also includes a third end beam 6, which is located on the side of the first end beam 4 facing away from the battery module 1. There is an installation space between the third end beam 6 and the first end beam 4, and the installation space can be used as an electrical warehouse, a BMS motherboard or a BDU (Battery energy Distribution Unit, BDU, battery energy distribution unit).

[0058] Through the battery pack of this solution, it is possible to collect the voltage and temperature information of each battery cell 11, thereby improving the comprehensiveness of the temperature data collection of the battery cell 11. When any battery cell in the battery pack has thermal runaway, the BMS main control module can promptly detect the temperature information of the battery cell with thermal runaway.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack includes a battery module and a BMS mainboard, the battery module includes a plurality of battery cells and a plurality of acquisition modules, the plurality of acquisition modules correspond to the plurality of battery cells one by one, and the acquisition module is communicatively connected with the battery cells corresponding to the acquisition modules to collect temperature information of the battery cells; The multiple acquisition modules are all connected to the BMS mainboard, and each of the acquisition modules can send the collected temperature information to the BMS mainboard; The battery cell comprises a negative electrode column and a first cover plate, the negative electrode column and the collection module are both arranged on the first cover plate, the multiple battery cells are arranged along a first direction, and in two adjacent battery cells, the two first cover plates included in the two battery cells are located at different ends in a second direction, and the first direction is perpendicular to the second direction; The battery module also includes a communication line, the multiple acquisition modules are all connected to the communication line, and the communication line is connected to the BMS mainboard; The communication line comprises a first connecting section, a connecting section and a second connecting section connected in sequence, the first connecting section and the second connecting section are respectively fixed at two ends of the whole body formed by the plurality of battery cells in the second direction; The first connecting section is connected to the acquisition module located on the same side as the first connecting section, and the second connecting section is connected to the acquisition module located on the same side as the second connecting section; The acquisition module includes a PCB, an acquisition chip, a temperature sensor, a first connecting bar and a heat conducting part. The temperature sensor and the acquisition chip are both fixed to the PCB. The first end of the first connecting bar is connected to the PCB, the second end of the first connecting bar is connected to the first cover plate, the heat conducting part is attached to the PCB, the heat conducting part is located between the temperature sensor and the first connecting bar, and the temperature sensor is connected to the acquisition chip in communication; The acquisition module also includes a transmitting antenna, which is connected to the acquisition chip and is attached to the communication line.

2. The battery pack according to claim 1, characterized in that: The battery module also includes two end plates, which are respectively arranged on both sides of the whole body formed by the multiple battery cells in the first direction. Limiting grooves are provided on the two end plates, and part of the communication line is arranged in the limiting grooves.

3. The battery pack according to claim 2, characterized in that: The battery pack includes a plurality of battery modules, and the plurality of battery modules are all connected to the BMS mainboard, and the two communication lines included in two adjacent battery modules are connected in series.

4. The battery pack according to claim 3, characterized in that: The battery module further comprises a module output pole, and the battery cell at the end of the battery module located in the first direction is connected to the module output pole; The battery pack also includes a first connecting aluminum bar, and the two module output poles in two adjacent battery modules are connected through the first connecting aluminum bar.

5. The battery pack according to claim 4, characterized in that: The battery pack also includes a first end beam, which is arranged at one end of the battery module in the first direction. The position of the first connecting aluminum bar in the third direction is higher than the upper end surface of the first end beam in the third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

6. The battery pack according to claim 5, characterized in that: The battery pack also includes two second end beams, which are spaced apart along the second direction, and the multiple battery modules are arranged between the two second end beams. The position of any acquisition module in the third direction is higher than the upper end surface of the second end beam in the third direction.

7. The battery pack according to claim 5, characterized in that: The battery pack includes a third end beam, which is located on a side of the first end beam facing away from the battery module. An installation space is formed between the third end beam and the first end beam, and the BMS mainboard is arranged in the installation space.

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