WO2024008194A1 - 电池包 - Google Patents

电池包 Download PDF

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Publication number
WO2024008194A1
WO2024008194A1 PCT/CN2023/106614 CN2023106614W WO2024008194A1 WO 2024008194 A1 WO2024008194 A1 WO 2024008194A1 CN 2023106614 W CN2023106614 W CN 2023106614W WO 2024008194 A1 WO2024008194 A1 WO 2024008194A1
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WO
WIPO (PCT)
Prior art keywords
battery pack
battery
circuit board
sampling circuit
pack according
Prior art date
Application number
PCT/CN2023/106614
Other languages
English (en)
French (fr)
Inventor
任朝举
张国江
江吉兵
徐宇虹
Original Assignee
湖北亿纬动力有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 湖北亿纬动力有限公司 filed Critical 湖北亿纬动力有限公司
Publication of WO2024008194A1 publication Critical patent/WO2024008194A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the field of battery technology, and in particular, to a battery pack.
  • the sampling circuit board can reduce the use of the internal space of the battery pack, simplify the circuit, and improve the efficiency of the group.
  • the sampling circuit board is usually placed on the top of the battery core. Since the temperature at the top of the battery core is relatively high, the arrangement of the sampling circuit board will affect the heat dissipation ability of the battery core, resulting in poor heat dissipation effect of the battery, and the battery core is prone to malfunction. The risk of thermal runaway, leading to battery pack explosion or fire.
  • the present disclosure provides a battery pack that has a good heat dissipation effect, thereby effectively avoiding the occurrence of thermal runaway of the battery core due to excessive internal temperature of the battery pack.
  • the present application provides a battery pack, including a plurality of battery cells, a bus bar, and a sampling device; the bus bar is arranged on the top of the battery core and electrically connects several of the battery cells to form a battery cell group; the sampling device The device includes a sampling circuit board, which is arranged on the first side of the battery core group and is electrically connected to the busbar.
  • the busbar is arranged to electrically connect several cells to form a cell group, and the electrical connection between the sampling circuit board and the busbar can collect signals such as temperature and pressure of the cells in the cell group.
  • the sampling circuit board can be prevented from affecting the heat dissipation of the top of the battery cell and the bus bar, thereby effectively avoiding the occurrence of thermal runaway of the battery core caused by excessive internal temperature of the battery pack.
  • the sampling circuit board is disposed on the side of the battery pack, the space occupied in the height direction of the battery pack is reduced.
  • Figure 1 is a structural schematic diagram 1 of the partial structure of the battery pack provided by the present disclosure
  • Figure 2 is a schematic assembly diagram of the busbar and sampling circuit board provided by the present disclosure
  • Figure 3 is an enlarged view of the partial structure at A in Figure 1;
  • Figure 4 is a second structural schematic diagram of the partial structure of the battery pack provided by the present disclosure.
  • Battery core 100. Battery core group; 200. Bracket; 210. End plate; 211. Raised rib; 212. Glue hole; 220. First side plate; 221. Fixed part; 222. Support part; 230. Second side plate; 300, sampling circuit board; 310, second connection part; 400, bus bar; 410, first connection part; 420, positive connection part; 430, negative connection part; 440, base material; 500, connection 600, series row; 700, positive output row; 800, negative output row; 900, liquid cooling plate; 1000, nickel sheet.
  • first position and second position are two different positions, and the first feature “on”, “above” and “above” the second feature include the first feature on the second feature. Directly above and diagonally above, or simply means that the level of the first feature is higher than that of the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • connection should be understood in a broad sense.
  • connection or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components.
  • connection or integral connection
  • connection, or integral connection can be a mechanical connection or an electrical connection
  • it can be a direct connection or an indirect connection through an intermediate medium
  • it can be an internal connection between two components.
  • specific meanings of the above terms in this disclosure can be understood on a case-by-case basis.
  • this embodiment provides a battery pack, including a battery cell 10, a bus bar 400 and a sampling device.
  • the bus bar 400 is disposed on the top of the battery cells 10 and electrically connects several battery cells 10 to form a battery core group.
  • the sampling device includes a sampling circuit board 300.
  • the sampling circuit board 300 is disposed on the first side of the battery pack and is electrically connected to the bus bar 400.
  • the bus bar 400 is arranged to electrically connect several cells 10 to form a cell group, and then the sampling circuit board 300 and the bus bar 400 are electrically connected. Therefore, the sampling device can collect the Signals such as temperature and pressure of the battery cells 10 in the battery pack.
  • the sampling circuit board 300 By arranging the sampling circuit board 300 on the side of the battery pack, the sampling circuit board 300 can be prevented from affecting the heat dissipation of the top of the battery cell 10 and the bus bar 400, thereby effectively avoiding the occurrence of thermal runaway of the battery cell 10 caused by excessive internal temperature of the battery pack. .
  • the sampling circuit board 300 is disposed on the side of the battery pack, the space occupied in the height direction of the battery pack is reduced.
  • the sampling circuit board 300 may be a flexible flat cable.
  • Flexible flat cable is a kind of flexible electronic component, also known as FFC. It is a new type of data made of PET (Polyethylene terephthalate) insulation material and extremely thin tinned flat copper wire, pressed through a high-tech automated equipment production line. Cables. It has the advantages of small size, high density, strong functions, low process difficulty, and can ensure stable quality. The number and spacing of wires can be freely selected to meet various connection needs.
  • each battery group is connected to a sampling circuit board 300 , and adjacent battery groups are connected in series through series rows 600 .
  • the positive electrode is provided with a positive output row 700
  • the negative electrode is provided with a negative output row 800.
  • the bus bar 400 uses a 0.3mm thin copper bar.
  • the series bus bar 600, the positive output bar 700 and the negative output bar 800 use variable cross-section copper bars, which are welded from 0.3mm and 2mm copper sheets. This can not only meet the overcurrent requirements. , and can save space.
  • each battery cell group includes a plurality of battery cells 10 arranged in a rectangular parallelepiped shape, and the first side refers to the side in the length direction of the battery cell group.
  • the sampling device also includes a connector 500 that electrically connects the sampling circuit board 300 and the battery management system.
  • the connector 500 can be electrically connected to the sampling circuit board 300 through plugging, laser welding or terminal crimping.
  • the connector 500 is provided on the second side of the battery pack, that is, the side in the width direction of the battery pack.
  • the connector 500 and the sampling circuit board 300 can be disposed on the same plane, and the specific layout can be set according to the structures of the connector 500 and the sampling circuit board 300 .
  • connection structure of the bus bar 400 and the sampling circuit board 300 See Figure 2 for the connection structure of the bus bar 400 and the sampling circuit board 300.
  • the bus bar 400 has a first connection part 410, and the first connection part 410 is connected to the nickel piece 1000.
  • the sampling circuit board 300 has a second connection part 310.
  • the second connecting part 310 is connected to the nickel piece 1000 through terminal crimping.
  • Terminal crimping is a common conductive connection method, and the terminal model can be selected according to the use needs. Using this connection method, the connection is convenient and reliable.
  • the connector 500 and the sampling circuit board 300 are connected via terminal crimps.
  • Terminal crimping is a commonly used electrical connection method in circuit connections and will not be described in detail here.
  • the connection between the bus bar 400 and the sampling circuit board 300 and the connection between the connector 500 and the sampling circuit board 300 may also be accomplished by other methods such as laser welding.
  • the battery pack also includes a bracket 200, and the sampling device is fixedly connected to the bracket 200.
  • the sampling circuit board 300 can be fixed to the bracket 200 through connecting components such as screws to prevent the sampling circuit board 300 from positional deviation.
  • the bracket 200 includes an end plate 210.
  • the end plate 210 is provided with a communication hole.
  • the bus bar 400 is provided on the end plate 210 and is electrically connected to the battery core 10 through the communication hole.
  • Each bus bar 400 includes a plurality of bus bar units.
  • the plurality of bus bar units are connected through a base material 440 .
  • the first connecting portion 410 is located at the end of the bus bar 400 .
  • Each busbar unit includes a positive electrode connecting portion 420 and a negative electrode connecting portion 430 that are connected to each other. That is, each busbar unit can connect two battery cells 10 in series.
  • the communication holes include a positive electrode communication hole and a negative electrode communication hole.
  • the positive electrode connection part 420 is electrically connected to the positive electrode of the battery core 10 through the positive electrode communication hole
  • the negative electrode connection part 430 is electrically connected to the negative electrode of the battery core 10 through the negative electrode communication hole.
  • busbar units are connected in a wavy shape through the base material 440, so that the cells 10 below the busbar 400 are disposed in a staggered manner to fully utilize the internal space of the battery pack and ensure that the battery pack has high energy. density.
  • the bracket 200 also includes a first side plate 220.
  • the first side plate 220 is connected to the end plate 210 and is arranged perpendicularly to the end plate 210.
  • the sampling circuit board 300 fits the first side plate 220. set up.
  • the outer contour of the end plate 210 of the bracket 200 is rectangular with long sides and short sides.
  • the first side plate 220 in this embodiment refers to a plate-like structure connected to the long sides of the end plate 210 .
  • the first side plate 220 and the end plate 210 are arranged vertically and extend toward the bottom of the battery pack. The arrangement of the first side plate 220 can limit the position of the sampling circuit board 300 to ensure its position on the side of the battery pack.
  • a support portion 222 can be provided on the lower edge of the first side plate 220 to limit the position of the sampling circuit board 300 .
  • the support portion 222 is a rectangular sheet structure extending toward the bottom of the battery core 10 , and its outer side is flush with the outer side of the first side plate 220 .
  • the shape of the supporting portion 222 can be set as needed.
  • the connector 500 can also be fixed on the second side plate 230 of the bracket 200 .
  • the second side plate 230 is a plate-like structure connected to the short side of the end plate 210 .
  • the connector 500 can be fixed to the second side plate 230 by bonding or snapping.
  • the battery pack also includes a detection element.
  • the detection element is arranged on the bracket 200 .
  • the detection element is electrically connected to the sampling circuit board 300 .
  • the detection element may be a temperature sensor or a pressure sensor or other components used for sampling the battery core 10 .
  • a fixing part 221 is provided on the side of the battery pack.
  • the fixing part 221 is connected to the first side plate 220 , and the detection element is fixed on the fixing part 221 .
  • the fixing portion 221 extends toward the bottom direction of the battery core 10 .
  • There are multiple fixing portions 221 and the plurality of fixing portions 221 are spaced apart along the long sides of the side plates.
  • the detection element in this embodiment is a dripper-type temperature sensor, which is connected to the sampling circuit board 300 using a terminal crimping method. Compared with the traditional welding connection, this connection method has higher reliability, simpler process, and economy. Better advantages.
  • the battery core temperature acquisition requirement is to reflect the battery core temperature in the highest temperature area in the entire battery core group. The design requirements are extremely high. According to the simulation results, the high temperature areas are located 1/3 of the way up from the bottom of the battery core 10.
  • the fixed part 221 is used to fix the dripper temperature sensor in a suitable position, which can ensure the accuracy of the collection position and also protect the dripper temperature sensor.
  • a liquid cooling plate 900 is provided on the end plate 210, and a liquid cooling channel is provided on the liquid cooling plate 900.
  • a liquid inlet and a liquid outlet are provided on the end surface of the liquid cooling plate 900, and the liquid cooling plate 900 is provided with a liquid inlet and a liquid outlet. The coolant flows through the liquid cooling channel and then flows out from the liquid outlet to achieve the cooling effect of the battery pack.
  • thermal conductive glue (not shown in the figure) is provided between the end plate 210 and the liquid cooling plate 900 .
  • Thermal conductive glue is laid on the surface of the bracket 200 and the bus bar 400.
  • the thermal conductive glue can bond the bracket 200 and the bus bar 400 to ensure that their positions do not move relative to each other, which increases the rigidity and stability of the structure; on the other hand, the thermal conductive glue can bond the bracket 200 and the bus bar 400.
  • the bus bar 400 locally heats up seriously.
  • the setting of the thermal conductive adhesive can transfer the heat of the bus bar 400 to the lower temperature part, preventing the local temperature inside the battery from being too high, causing thermal runaway of the battery core 10, etc. Security risks.
  • the bracket 200 is provided with a glue hole 212 , and the thermally conductive glue can contact the end surface of the battery core 10 through the glue hole 212 .
  • Thermal conductive glue can be filled in the glue holes 212 and directly contact the battery core 10, so that the heat transfer effect of the thermal conductive glue can be fully exerted, the heat of the battery core 10 can be quickly dispersed, and the thermal runaway phenomenon of the battery core 10 can be prevented.
  • the sampling circuit board 300 is arranged on the side of the battery core group, so that the thermal conductive glue can directly contact the top of the battery core 10. The heat of the battery core 10 and the bus 400 is directly transferred to the liquid cooling plate 900 through the thermal conductive glue without going through the sampling circuit. board 300, therefore, the battery pack has good heat dissipation effect and can effectively reduce the risk of thermal runaway caused by excessive temperature of the battery core 10.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

公开了一种电池包。该电池包包括电芯、汇流排和采样装置。汇流排设置在电芯的顶部并将若干电芯电连接形成电芯组。采样装置包括采样电路板，采样电路板设置在电芯组的第一侧面，并和汇流排电连接。

Description

电池包
本申请要求在2022年7月8日提交中国专利局、申请号为202221759894.9的中国专利申请的优先权，以上申请的全部内容通过引用结合在本申请中。
技术领域
本公开涉及电池技术领域，尤其涉及一种具有电池包。
 背景技术
在相关技术的动力电池中，需对电池包内部电芯的温度及电压信号进行采集，再通过电池管理***实时监控，管理并调节电池包运行状态。相关技术中动力电池大多采用线束来采集电芯的温度和电压信号，但采样线束通常走线复杂，装配困难，生产效率低下，并且线束会占据电池包内部的大量空间，不利于电池包空间的优化利用和成组效率的提高。因此，采样电路板的应用愈加广泛。
采样电路板能够减少对电池包内部空间的利用，并简化电路，提高成组效率。但是，相关技术中，采样线路板通常设置在电芯的顶部，而由于电芯顶部温度较高，采样电路板的如此设置将影响电芯的散热能力，导致电池散热效果差，电芯容易发生热失控的风险，进而导致电池包***或失火。
 发明概述
本公开提供一种电池包，该电池包具有良好的散热效果，从而有效避免电池包内部温度过高造成电芯热失控的现象发生。
为达此目的，本公开采用以下技术方案：
本申请提供一种电池包，包括多个电芯，汇流排、以及采样装置；所述汇流排设置在所述电芯的顶部并将若干所述电芯电连接形成电芯组；所述采样装置包括采样电路板，所述采样电路板设置在所述电芯组的第一侧面，并与所述汇流排电连接。
有益效果
本公开提供的电池包中，汇流排的设置能够将若干个电芯电连接形成电芯组，采样电路板和汇流排进行电连接能够采集该电芯组中电芯的温度、压力等信号。同时，通过将采样电路板设置在电芯组的侧面，能够避免采样电路板影响电芯顶部及汇流排的散热，从而有效避免电池包内部温度过高造成电芯热失控的现象发生。另外，由于采样电路板设置在电芯组的侧面，因而减少占据电池包高度方向上的空间。
 附图说明
图1是本公开提供的电池包的局部结构的结构示意图一；
图2是本公开提供的汇流排和采样电路板的装配示意图；
图3是图1中A处的局部结构放大图；
图4是本公开提供的电池包的局部结构的结构示意图二。
附图标记说明：
10、电芯；100、电芯组；200、支架；210、端板、211、凸棱；212、过胶孔；220、第一侧板；221、固定部；222、支撑部；230、第二侧板；300、采样电路板；310、第二连接部；400、汇流排；410、第一连接部；420、正极连接部；430、负极连接部；440、基材；500、连接器；600、串联排；700、正极输出排；800、负极输出排；900、液冷板；1000、镍片。
 本发明的实施方式
在本公开的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、仅用于描述目的，而不能理解为指示或暗示相对重要性。其中，术语“第一位置”和“第二位置”为两个不同的位置，而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
参见图1，本实施例提供一种电池包，包括电芯10、汇流排400和采样装置。汇流排400设置在电芯10的顶部并将若干电芯10电连接形成电芯组。采样装置包括采样电路板300，采样电路板300设置在电芯组的第一侧面，并和汇流排400电连接。
上述具有采样装置的电池包，其中，汇流排400的设置能够将若干个电芯10电连接形成电芯组，再将采样电路板300和汇流排400进行电连接，因此，采样装置能够采集该电芯组中电芯10的温度、压力等信号。通过将采样电路板300设置在电芯组的侧面，能够避免采样电路板300影响电芯10顶部及汇流排400的散热，从而有效避免电池包内部温度过高造成电芯10热失控的现象发生。
另外，由于采样电路板300设置在电芯组的侧面，因而减少占据电池包高度方向上的空间。
在一些实施例中，采样电路板300可以为柔性扁平电缆。为了节约空间，降低质量及成本，电池包常常采用柔性扁平电缆与各个电芯10电连接并进行采样。柔性扁平电缆是一种柔性电子部件，也被称为FFC，是一种用PET（Polyethylene terephthalate）绝缘材料和极薄的镀锡扁平铜线，通过高科技自动化设备生产线压合而成的新型数据线缆。它具有体积小、密度高、功能强、工艺难度低，能够保证质量稳定的优点，并且可以自由选择导线数量和导线间距，满足各种连接需求。
在一些实施例中，电芯组设置有多个，每个电芯组均连接有采样电路板300，相邻电芯组之间通过串联排600串联。多个电芯组串联之后的正极设置有正极输出排700，其负极设置有负极输出排800。其中汇流排400使用0.3mm的薄铜排，串联排600、正极输出排700和负极输出排800采用变截面铜排，由0.3mm和2mm的铜片焊接而成，这样不仅能够满足过流要求，又能节省空间。
在本实施例的电池包中，每个电芯组包括排列呈长方体的多个电芯10，第一侧面指电芯组长度方向的侧面。电芯组设置有三个，因此，采样电路板300设置有三个，其中，两个采样电路板300设置在大电芯组的外侧，一个采样电路板300夹设在相邻的两个电芯组之间。三个电芯组通过两个串联排600进行串联形成大电芯组。在其他实施例中，电芯组的数量可以为两个、四个或五个等，根据使用需要设置即可。
采样装置还包括连接器500，连接器500将采样电路板300和电池管理***电连接。可选地，连接器500可以通过插接、激光焊接或端子压线等方式和采样电路板300进行电连接。本实施例中，连接器500设置在电芯组的第二侧面，即电芯组宽度方向的侧面。在其他实施例中，连接器500可以和采样电路板300设置于同一平面，具体布局根据连接器500及采样电路板300的结构进行设置即可。
汇流排400和采样电路板300的连接结构参见图2，具体地，汇流排400具有第一连接部410，第一连接部410连接有镍片1000，采样电路板300具有第二连接部310，第二连接部310与所述镍片1000通过端子压线连接。端子压线为常用的导电连接方式，端子的型号根据使用需要进行选择即可。采用这种连接方式，连接方便可靠。
在一些实施例中，连接器500和采样电路板300通过端子压线连接。端子压线为电路连接中常用的电连接方式，在此不再进行赘述。当然，在其他实施例中，汇流排400和采样电路板300的连接以及连接器500和采样电路板300的连接也可以采用激光焊接等其他方式。
参见图3，电池包还包括支架200，采样装置和支架200固定连接。采样电路板300可以通过螺钉等连接部件和支架200进行固定，防止采样电路板300发生位置偏移。支架200包括端板210，端板210上设置有连通孔，汇流排400设置在端板210上，并通过连通孔与电芯10电连接。
具体地。每个汇流排400包括多个汇流排单体，多个汇流排单体之间通过基材440进行连接，第一连接部410位于汇流排400的末端。每个汇流排单体包括互相连接的正极连接部420和负极连接部430，即每个汇流排单体能够将两个电芯10进行串联。连通孔包括正极连通孔和负极连通孔，正极连接部420通过正极连通孔和电芯10的正极电连接，负极连接部430通过负极连通孔和电芯10的负极电连接。采用这种结构实现汇流排400和电芯10的电连接，能够有效避免汇流排400或电芯10移位造成的电芯10短路。可选地，多个汇流排单体通过基材440呈波浪形连接，从而汇流排400下方的电芯10错位设置，以达到充分利用电池包内部空间的目的，保证电池包具有较高的能量密度。
支架200还包括第一侧板220，所述第一侧板220连接于所述端板210，并垂直于所述端板210设置，所述采样电路板300贴合所述第一侧板220设置。在本实施例中，支架200端板210的外轮廓呈长方形，具有长边和短边，本实施例中的第一侧板220指连接于端板210长边的板状结构。在一些实施例中，第一侧板220和端板210垂直设置，向电芯组底部的方向延伸。第一侧板220的设置能够对采样电路板300起到限位作用，保证其在电芯组侧面的位置。可选地，可以在第一侧板220的下边缘设置支撑部222，对采样电路板300起到限位作用。在本实施例中，支撑部222为向电芯10底部延伸的长方形片状结构，其外侧和第一侧板220的外侧平齐。在其他实施例中，支撑部222的形状根据需要进行设置即可。在一些实施例中，连接器500也可以固定在支架200的第二侧板230上，第二侧板230为连接于端板210的短边的板状结构。连接器500可通过粘接或卡接等方式和第二侧板230进行固定。
参见图3，电池包还包括检测元件，检测元件设置在支架200上，检测元件和采样电路板300电连接。检测元件可以为温度传感器或压力传感器或其他用于对电芯10采样的部件。电芯组的侧面设置有固定部221，固定部221连接于第一侧板220，检测元件固定在固定部221上。固定部221朝向电芯10的底部方向延伸，固定部221设置有多个，多个固定部221沿侧板的长边间隔设置。
本实施例中的检测元件为水滴头式温度传感器，采用端子压接方式和采样电路板300进行连接，这种连接方式相比传统的焊接连接，具有可靠性更高，工艺更简单，经济性更好的优点。对于电芯温度采集要求能够反映整个电芯组中温度最高区域的电芯温度，对于设计要求极高，通过仿真结果，高温区域都位于电芯10从底部往上1/3位置处，固定部221用于将水滴头式温度传感器固定在合适位置，能够保证采集位置的精准度，同时还能够对水滴头式温度传感器进行保护。
参见图4，端板210上设置有液冷板900，液冷板900上设置有液冷通道，液冷板900的端面上设置有进液口和出液口，通过向进液口通入冷却液，冷却液流经液冷通道后从出液口流出，达到对电池包冷却降温的效果。
进一步地，端板210和液冷板900之间设置有导热胶（图中未示出）。导热胶敷设在支架200和汇流排400的表面，一方面，导热胶能够将支架200和汇流排400进行粘接，保证两者位置不发生相对移动，增加了结构的刚度和稳定性；另一方面，电池在充放电过程中，汇流排400局部发热严重，导热胶的设置能够将汇流排400的热量传递至温度较低的部位，避免电池内部局部温度过高，造成电芯10热失控等安全隐患。在一些实施例中，支架200上设置有过胶孔212，导热胶能够通过过胶孔212和电芯10的端面接触。导热胶能够填充于过胶孔212，直接和电芯10接触，从而能够充分发挥导热胶的传热作用，迅速分散电芯10热量，防止电芯10热失控现象发生。将采样电路板300设置在电芯组的侧面，从而导热胶能够和电芯10顶部直接接触，电芯10及汇流排400的热量通过导热胶直接传递至液冷板900，而无需经过采样电路板300，因此，该电池包具有良好的散热效果，能够有效降低由电芯10温度过高造成的热失控风险。

Claims (14)

  1. 一种电池包，包括：
    多个电芯(10)；
    汇流排(400)，设置在多个所述电芯(10)的顶部并将多个所述电芯(10)电连接形成电芯组；以及
    采样装置，包括采样电路板(300)，所述采样电路板(300)设置在所述电芯组的第一侧面，并与所述汇流排(400)电连接。
  2. 根据权利要求1所述的电池包，其中，所述电芯组设置有多个，每个所述电芯组均连接有所述采样电路板(300)，相邻所述电芯组之间通过串联排(600)串联。
  3. 根据权利要求1所述的电池包，其中，所述采样装置还包括连接器(500)，所述连接器(500)将所述采样电路板(300)电连接至电池管理***。
  4. 根据权利要求3所述的电池包，其中，所述连接器(500)设置在所述电芯组的第二侧面。
  5. 根据权利要求3所述的电池包，其中，所述连接器(500)与所述采样电路板(300)通过端子压线连接。
  6. 根据权利要求1所述的电池包，其中，所述电池包还包括支架(200)，所述支架(200)包括端板(210)，所述端板(210)上设置有连通孔，所述汇流排(400)设置在所述端板(210)上，并通过所述连通孔与所述电芯(10)电连接，所述采样装置和所述支架(200)固定连接。
  7. 根据权利要求6所述的电池包，其中，所述支架(200)还包括第一侧板(220)，所述第一侧板(220)连接于所述端板(210)，并垂直于所述端板(210)设置，所述采样电路板(300)贴合所述第一侧板(220)设置。
  8. 根据权利要求7所述的电池包，其中，所述采样装置还包括检测元件，所述检测元件设置在所述支架(200)上，并与所述采样电路板(300)电连接。
  9. 根据权利要求8所述的电池包，其中，所述第一侧板(220)上连接有固定部(221)，所述检测元件固定在所述固定部(221)上。
  10. 根据权利要求6所述的电池包，其中，所述端板(210)上设置有液冷板(900)。
  11. 根据权利要求10所述的电池包，其中，所述端板(210)和所述液冷板(900)之间设置有导热胶。
  12. 根据权利要求11所述的电池包，所述汇流排（400）和所述支架（200）通过导热胶粘接。
  13. 根据权利要求1-12任一项所述的电池包，其中，所述汇流排(400)具有第一连接部(410)，所述第一连接部(410)连接有镍片(1000)，所述采样电路板(300)具有第二连接部(310)，所述第二连接部(310)与所述镍片(1000)通过端子压线连接。
  14. 根据权利要求13所述的电池包，其中，所述采样电路板(300)为柔性扁平电缆。
PCT/CN2023/106614 2022-07-08 2023-07-10 电池包 WO2024008194A1 (zh)

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