Single battery and battery module

Abstract

In order to solve the problem that an energy storage power battery or module in the prior art cannot monitor the internal health condition of a single battery in real time, the utility model provides a single battery and a battery module, the single battery comprises a shell, a signal transmission connector, a battery cell assembly and a monitoring assembly, and the monitoring assembly comprises a voltage sensor; the voltage sensor comprises an acquisition end and a transmission line; at least one of the positive tab and the negative tab of at least one core package is provided with a voltage acquisition end, and the voltage acquisition end is connected to the signal transmission connector through a voltage transmission line. According to the single battery provided by the utility model, the voltage of the core package in the single battery is acquired by utilizing the voltage sensor and is transmitted to the signal transmission connector through the voltage transmission line, and the voltage information of the core package is transmitted to a management system of the battery module by the output wire harness, so that the self-monitoring of the voltage health condition of the battery module in the whole life cycle is realized; and the battery management system can conveniently and timely take countermeasures for core package abnormity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery related technical field, concretely relates to a single battery and battery module. BACKGROUND

[0002] The existing battery with monitoring function usually only roughly monitors the voltage and temperature of the pole outside the battery core, and controls through the battery management system (BMS). This monitoring method cannot comprehensively grasp the health status of the single battery in the whole life cycle, resulting in problems such as overcharge, overdischarge, high internal resistance, insufficient endurance, inconsistent life with expectation, and even causing fire, explosion and other safety accidents.

[0003] The defect of the prior art is that it can only realize the monitoring of the outside of the battery core, cannot obtain the key parameter information inside each single battery in real time, such as expansion force, pole voltage, resistance, temperature and impedance of the welding position of the pole lug and the adapter piece and the pole, and further cannot accurately evaluate the health status of the battery and timely warn potential safety hazards. UTILITY MODEL CONTENT

[0004] In view of the problem that the energy storage battery in the prior art cannot monitor the internal health status of the single battery in real time, a single battery and a battery are provided.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is as follows:

[0006] On the one hand, the utility model provides a single battery, which comprises a shell, a signal transmission connector, a battery core assembly and a monitoring assembly for monitoring the health status of the battery core assembly;

[0007] The shell is provided with a positive pole and a negative pole;

[0008] The signal transmission connector is arranged on the shell, and the signal transmission connector is sealingly connected with the shell;

[0009] The battery core assembly is arranged in the shell, and the battery core assembly comprises two groups of core packs, a positive connection piece and a negative connection piece, each group of core packs comprises at least one core pack, the positive lug of the two groups of core packs is connected with the positive connection piece, the positive connection piece is connected with the positive pole, the negative lug of the two groups of core packs is connected with the negative connection piece, and the negative connection piece is connected with the negative pole;

[0010] The monitoring assembly is arranged in the shell and connected with the signal transmission connector;

[0011] The monitoring assembly comprises a voltage sensor;

[0012] The voltage sensor comprises a voltage collection end and a voltage transmission line; the voltage collection end is arranged on each of the core packs, and at least one of the positive and negative tabs of at least one of the core packs in each group is provided with the voltage collection end; and the voltage collection end is connected to the signal transmission connector through the voltage transmission line.

[0013] Optionally, the voltage collection end of the voltage sensor comprises a first voltage collection end and a second voltage collection end.

[0014] The first voltage collection end and the second voltage collection end are respectively arranged on the positive tabs farthest from the positive connection piece in the two groups of core packs; the first voltage collection end and the second voltage collection end are located on the side of the corresponding positive tab away from the positive connection piece; or,

[0015] The first voltage collection end and the second voltage collection end are respectively arranged on the negative tabs farthest from the negative connection piece in the two groups of core packs; the first voltage collection end and the second voltage collection end are located on the side of the corresponding negative tab away from the negative connection piece.

[0016] The voltage transmission line of the voltage sensor comprises a first voltage transmission line and a second voltage transmission line.

[0017] The first voltage collection end is connected to the signal transmission connector through the first voltage transmission line.

[0018] The second voltage collection end is connected to the signal transmission connector through the second voltage transmission line.

[0019] Optionally, the number of core packs is 2-8, and is an even number; and the plurality of core packs is divided into two groups of core packs.

[0020] Each of the core packs has one or more positive tabs and one or more negative tabs.

[0021] One of the positive tabs of one of the core packs in one group is provided with a first voltage collection end, and one of the positive tabs of one of the core packs in the other group is provided with a second voltage collection end; or,

[0022] One of the negative tabs of one of the core packs in one group is provided with a first voltage collection end, and one of the negative tabs of one of the core packs in the other group is provided with a second voltage collection end.

[0023] Optionally, the first voltage collection end and the second voltage collection end are connected to one side of the positive tab or the negative tab, and each is respectively close to the positive tab or the negative tab of the other group of core packs.

[0024] Optionally, the monitoring assembly comprises a first temperature sensor.

[0025] The first temperature sensor comprises a first temperature collection end and a first temperature transmission line connected with each other; the first temperature collection end is arranged on a side of one group of the core packs facing another group of the core packs, and the first temperature transmission line is connected to the signal transmission connector.

[0026] Optionally, the monitoring assembly further comprises a second temperature sensor.

[0027] The second temperature sensor comprises a second temperature collection end and a second temperature transmission line connected with each other; the second temperature collection end is arranged at a part of the positive pole tab connected with the positive pole, and the second temperature transmission line is connected to the signal transmission connector; and / or,

[0028] The second temperature sensor comprises a third temperature collection end and a third temperature transmission line connected with each other; the third temperature collection end is arranged at a part of the negative pole tab connected with the negative pole, and the third temperature transmission line is connected to the signal transmission connector; and / or,

[0029] The second temperature sensor comprises a fourth temperature collection end and a fourth temperature transmission line connected with each other; the fourth temperature collection end is arranged at the positive pole tab, and the fourth temperature transmission line is connected to the signal transmission connector; and / or,

[0030] The second temperature sensor comprises a fifth temperature collection end and a fifth temperature transmission line connected with each other; the fifth temperature collection end is arranged at the negative pole tab, and the fifth temperature transmission line is connected to the signal transmission connector.

[0031] Optionally, the monitoring assembly further comprises an internal resistance sensor.

[0032] The internal resistance sensor comprises a first internal resistance collection end and a first internal resistance transmission line connected with each other; the first internal resistance collection end is arranged at a part of the positive pole tab connected with the positive pole, and the first internal resistance transmission line is connected to the signal transmission connector; and / or,

[0033] The internal resistance sensor comprises a second internal resistance collection end and a second internal resistance transmission line connected with each other; the second internal resistance collection end is arranged at a part of the negative pole tab connected with the negative pole, and the second internal resistance transmission line is connected to the signal transmission connector; and / or,

[0034] The internal resistance sensor comprises a third internal resistance collection end and a third internal resistance transmission line connected with each other; the third internal resistance collection end is arranged at the positive pole tab, and the third internal resistance transmission line is connected to the signal transmission connector; and / or,

[0035] The internal resistance sensor comprises a fourth internal resistance collecting end and a fourth internal resistance transmission line connected with each other; the fourth internal resistance collecting end is arranged on the negative electrode connecting piece; and the fourth internal resistance transmission line is connected to the signal transmission connector.

[0036] The monitoring assembly comprises an expansion force sensor, which comprises an expansion force collecting end and an expansion force transmission line connected with each other; the expansion force collecting end is arranged on the side surface of the battery cell assembly; and the expansion force transmission line is connected to the signal transmission connector.

[0037] Optionally, the shell comprises a shell body and a cover plate covering the shell body; the positive electrode pole, the negative electrode pole and the signal transmission connector are arranged on the cover plate; and an explosion-proof valve is further arranged on the cover plate.

[0038] The signal transmission connector is arranged between the explosion-proof valve and the negative electrode pole or between the explosion-proof valve and the positive electrode pole.

[0039] The inner end of the signal transmission connector does not protrude from the lowest position of the inner side of the cover plate.

[0040] Optionally, the signal transmission connector comprises an output terminal, a connector and an input terminal which are sequentially and sealingly connected.

[0041] The connector is sealingly arranged on the shell; and the output terminal is used for connecting a battery management system.

[0042] The input terminal is located in the shell; the inner end of the input terminal does not protrude from the lowest position of the inner side of the cover plate; and the monitoring assembly is connected to the input terminal.

[0043] In another aspect, the utility model provides a kind of battery, comprising multiple the monomer battery of the single battery.

[0044] The utility model has the advantages of:

[0045] The single battery provided by the utility model, including shell and electric core assembly, and setting monitoring assembly in the shell, using the monitoring assembly to monitor the health state of the electric core assembly, wherein the voltage sensor in the monitoring assembly is connected with the signal transmission connector, and makes the voltage collection end of the voltage sensor connected with at least one kind of pole lug of the positive pole lug and the negative pole lug of the core package, the voltage collection end is connected with the signal transmission connector through the voltage transmission line, using the voltage sensor to collect the voltage of the core package state obtained from the single battery interior and transmit to the signal transmission connector through the voltage transmission line, then output to the battery management system from the signal transmission connector to the outside, to monitor the internal voltage of the single battery life cycle, then realize the voltage monitoring of the whole life cycle of the battery module, improve the sensitivity and accuracy of monitoring, when the voltage of the battery is abnormal, the battery management system can take measures in time, improve the use safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is the single battery structure schematic provided by the utility model Figure 1 ;

[0047] Figure 2 It is the structure schematic before the electric core assembly of the utility model is combined core.

[0048] Figure 3 It is the single battery structure schematic provided by the utility model Figure 2 ;

[0049] Figure 4 It is Figure 3 the A-A section view of the single battery of the utility model.

[0050] The reference signs in the drawings of the specification are as follows:

[0051] 1, shell; 11, shell; 12, cover plate; 2, signal transmission connector; 21, output terminal; 22, connector; 23, input terminal; 3, core assembly; 31, core package; 32, positive connection piece; 33, negative connection piece; 4, monitoring assembly; 411, voltage acquisition end; 4111, first voltage acquisition end; 4112, second voltage acquisition end; 412, voltage transmission line; 4121, first voltage transmission line; 4122, second voltage transmission line; 42, internal resistance sensor; 421, first internal resistance acquisition end; 422, first internal resistance transmission line; 423, second internal resistance acquisition end; 424, second internal resistance transmission line; 425, third internal resistance acquisition end; 426, third internal resistance transmission line; 427, fourth internal resistance acquisition end; 428, fourth internal resistance transmission line; 43, expansion force sensor; 431, expansion force acquisition end; 432, expansion force transmission line; 44, first temperature sensor; 441, first temperature acquisition end; 442, first temperature transmission line; 45, second temperature sensor; 451, second temperature acquisition end; 452, second temperature transmission line; 453, third temperature acquisition end; 454, third temperature transmission line; 455, fourth temperature acquisition end; 456, fourth temperature transmission line; 457, fifth temperature acquisition end; 458, fifth temperature transmission line; 5, positive pole; 6, negative pole; 7, positive lug; 8, negative lug; 9, explosion-proof valve. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0053] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0054] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning of the utility model according to specific circumstances.

[0055] Referring to Figures 1-4 The utility model provides a single battery, including shell 1, signal transmission connector 2, electric core subassembly 3 and the monitoring component 4 for monitoring the health state of electric core subassembly 3;

[0056] The shell 1 is equipped with positive pole 5 and negative pole 6;

[0057] The signal transmission connector 2 is equipped in the shell 1, and the signal transmission connector 2 is sealingly connected with the shell 1;

[0058] The electric core subassembly 3 is arranged in the shell 1, and the electric core subassembly 3 includes two groups of core packs 31, positive connection sheets 32 and negative connection sheets 33, each group of core packs 31 includes at least one core pack 31;The positive ears 7 of the two groups of core packs 31 are connected with the positive connection sheets 32, and the positive connection sheets 32 are connected with the positive pole 5;The negative ears 8 of the two groups of core packs 31 are connected with the negative connection sheets 33, and the negative connection sheets 33 are connected with the negative pole 6;

[0059] The monitoring component 4 is arranged in the shell 1 and connected with the signal transmission connector 2;

[0060] The monitoring component 4 includes a voltage sensor;

[0061] The voltage sensor includes a voltage acquisition end 411 and a voltage transmission line 412;Each group of core packs 31 is correspondingly provided with the voltage acquisition end 411, at least one of the positive ears 7 and the negative ears 8 of at least one core pack 31 in a group of core packs 31 is provided with the voltage acquisition end 411, and the voltage acquisition end 411 is connected with the signal transmission connector 2 through the voltage transmission line 412.

[0062] Specifically, the single battery provided by the utility model, including shell 1 and electric core assembly 3, and monitoring assembly 4 is arranged in shell 1, the health state of electric core assembly 3 is monitored by monitoring assembly 4, wherein the voltage sensor in monitoring assembly 4 is connected with signal transmission connector 2, and the voltage collection end 411 of the voltage sensor is connected with at least one of the positive pole lug 7 and the negative pole lug 8 of the core package 31, the voltage collection end 411 is connected with signal transmission connector 2 through the voltage transmission line 412, the voltage of the core package state obtained from the single battery is collected by the voltage sensor and transmitted to signal transmission connector 2 through the voltage transmission line 412, and then the signal transmission connector 2 is output to the battery management system outside, so that the internal voltage of the single battery in the life cycle is monitored, the voltage monitoring of the whole life cycle of the battery is realized, the sensitivity and accuracy of monitoring are improved, the battery management system can take timely countermeasures when the voltage of the battery is abnormal, and the use safety of the battery is improved.

[0063] In an embodiment, the voltage collection end 411 includes a first voltage collection end 4111 and a second voltage collection end 4112.

[0064] The first voltage collection end 4111 and the second voltage collection end 4112 are respectively arranged on the positive pole lug 7 farthest from the positive pole connecting piece 32 in the two groups of core packages 31; the first voltage collection end 4111 and the second voltage collection end 4112 are located on the side of the corresponding positive pole lug 7 away from the positive pole connecting piece 32; or,

[0065] The first voltage collection end 4111 and the second voltage collection end 4112 are respectively arranged on the negative pole lug 8 farthest from the negative pole connecting piece 33 in the two groups of core packages 31; the first voltage collection end 4111 and the second voltage collection end 4112 are located on the side of the corresponding negative pole lug 8 away from the negative pole connecting piece 33.

[0066] The voltage transmission line 412 of the voltage sensor includes a first voltage transmission line 4121 and a second voltage transmission line 4122.

[0067] The first voltage collection end 4111 is connected with the signal transmission connector 2 through the first voltage transmission line 4121.

[0068] The second voltage collection end 4112 is connected with the signal transmission connector 2 through the second voltage transmission line 4122.

[0069] Specifically, on the one hand, the first voltage collection end 4111 and the second voltage collection end 4112 are arranged on the positive electrode ears 7 farthest from the positive electrode connecting piece 32 in the two groups of core packs 31 respectively, or the first voltage collection end 4111 and the second voltage collection end 4112 are arranged on the negative electrode ears 8 farthest from the negative electrode connecting piece 33 in the two groups of core packs 31 respectively, so as to realize the collection of the voltage parameters of the two groups of core packs 31 by the first voltage collection end 4111 and the second voltage collection end 4112; on the other hand, the first voltage collection end 4111 is connected to the signal transmission connector 2 through the first voltage transmission line 4121, and the second voltage collection end 4112 is connected to the signal transmission connector 2 through the second voltage transmission line 4122, so as to transmit the voltage parameters of the two groups of core packs 31 collected by the first voltage collection end 4111 and the second voltage collection end 4112 to the signal transmission connector 2, and realize the monitoring of the single battery voltage.

[0070] In an embodiment, the core packs 31 are 2-8 and are even in number; the plurality of core packs 31 are divided into two groups of core packs; when the core packs 31 are 2, one group of core packs includes one core pack 31; when the core packs 31 are 4, one group of core packs includes two core packs 31; when the core packs 31 are 6, one group of core packs includes three core packs 31; and when the core packs 31 are 8, one group of core packs includes four core packs 31.

[0071] Each of the core packs 31 has one or more positive electrode ears 7 and one or more negative electrode ears 8; for example, a three-electrode ear core pack 31 can include one positive electrode ear 7 and two negative electrode ears 8, or two positive electrode ears 7 and one negative electrode ear 8.

[0072] The first voltage collection end 4111 is arranged on one of the positive electrode ears 7 of one group of the core packs 31, and the second voltage collection end 4112 is arranged on one of the positive electrode ears 7 of the other group of the core packs 31; or

[0073] The first voltage collection end 4111 is arranged on one of the negative electrode ears 8 of one group of the core packs 31, and the second voltage collection end 4112 is arranged on one of the negative electrode ears 8 of the other group of the core packs 31.

[0074] Specifically, since the plurality of core packs 31 in the single battery are divided into two groups of core packs 31, the plurality of core packs 31 are arranged to be even in number; in addition, the first voltage collection end 4111 or the second voltage collection end 4112 is arranged on the positive electrode ear 7 or the negative electrode ear 8 of one group of core packs 31, or the first voltage collection end 4111 or the second voltage collection end 4112 is arranged on the positive electrode ear 7 or the negative electrode ear 8 of the other group of core packs 31, which is beneficial to accurately measuring the voltage conditions of the two groups of core packs 31.

[0075] In an embodiment, the first voltage collection end 4111 and the second voltage collection end 4112 are connected to one side of the positive tab 7 or the negative tab 8, and are respectively close to the other group of the positive tab 7 or the negative tab 8 of the core pack.

[0076] Specifically, connecting the first voltage collection end 4111 and the second voltage collection end 4112 to one side of the positive tab 7 or the negative tab 8 and close to the corresponding tab of the other group of core packs can reduce the length and resistance of the voltage collection end wire, and improve the accuracy of measurement.

[0077] In an embodiment, the monitoring assembly 4 further comprises a first temperature sensor 44;

[0078] The first temperature sensor 44 comprises a first temperature collection end 441 and a first temperature transmission line 442 connected to each other; the first temperature collection end 441 is arranged on the side of one group of core packs 31 facing the other group of core packs 31, and the first temperature transmission line 442 is connected to the signal transmission connector 2.

[0079] Specifically, by arranging the first temperature sensor 44 and using the first temperature collection end 441 and the first temperature transmission line 442 to connect with the signal transmission connector 2, accurate and reliable temperature monitoring of the single battery is realized.

[0080] The arrangement of the first temperature collection end 441 on the side of one group of core packs 31 facing the other group of core packs 31 helps to more accurately monitor the temperature distribution inside the battery.

[0081] In an embodiment, the monitoring assembly 4 comprises a second temperature sensor 45;

[0082] The second temperature sensor 45 comprises a second temperature collection end 451 and a second temperature transmission line 452 connected to each other; the second temperature collection end 451 is arranged at the part of the positive tab 7 connected with the positive connecting piece 32, and the second temperature transmission line 452 is connected to the signal transmission connector 2; and / or,

[0083] The second temperature sensor 45 comprises a third temperature collection end 453 and a third temperature transmission line 454 connected to each other; the third temperature collection end 453 is arranged at the part of the negative tab 8 connected with the negative connecting piece 33, and the third temperature transmission line 454 is connected to the signal transmission connector 2; and / or,

[0084] The second temperature sensor 45 comprises a fourth temperature collection end 455 and a fourth temperature transmission line 456 connected with each other; the fourth temperature collection end 455 is arranged on the positive tab 32, and the fourth temperature transmission line 456 is connected to the signal transmission connector 2; and / or

[0085] The second temperature sensor 45 comprises a fifth temperature collection end 457 and a fifth temperature transmission line 458 connected with each other; the fifth temperature collection end 457 is arranged on the negative tab 33, and the fifth temperature transmission line 458 is connected to the signal transmission connector 2.

[0086] Specifically, by the arrangement relationship between the second temperature collection end 451 and the second temperature transmission line 452, the third temperature collection end 453 and the third temperature transmission line 454, the fourth temperature collection end 455 and the fourth temperature transmission line 456, the fifth temperature collection end 457 and the fifth temperature transmission line 458 and the plurality of elements in the single battery, and in cooperation with the signal transmission connector 2, the temperature distribution of the single battery can be comprehensively monitored, so as to ensure that the battery using the single battery maintains the best electrical performance and safety during use.

[0087] In an embodiment, the monitoring assembly 4 further comprises an internal resistance sensor 42.

[0088] The internal resistance sensor 42 comprises a first internal resistance collection end 421 and a first internal resistance transmission line 422 connected with each other; the first internal resistance collection end 421 is arranged at the part of the positive lug 7 connected with the positive tab 32, and the first internal resistance transmission line 422 is connected to the signal transmission connector 2; and / or,

[0089] The internal resistance sensor 42 comprises a second internal resistance collection end 423 and a second internal resistance transmission line 424 connected with each other; the second internal resistance collection end 423 is arranged at the part of the negative lug 8 connected with the negative tab 33, and the second internal resistance transmission line 424 is connected to the signal transmission connector 2; and / or,

[0090] The internal resistance sensor 42 comprises a third internal resistance collection end 425 and a third internal resistance transmission line 426 connected with each other; the third internal resistance collection end 425 is arranged on the positive tab 32, and the third internal resistance transmission line 426 is connected to the signal transmission connector 2; and / or,

[0091] The internal resistance sensor 42 comprises a fourth internal resistance collection end 427 and a fourth internal resistance transmission line 428 connected with each other; the fourth internal resistance collection end 427 is arranged on the negative tab 33, and the fourth internal resistance transmission line 428 is connected to the signal transmission connector 2.

[0092] Specifically, the internal resistance sensor 42 in the monitoring assembly 4 is used to monitor the internal resistance condition of the single battery; the first internal resistance collection end 421 is arranged at the part of the positive electrode tab 7 connected with the positive electrode connecting tab 32, the second internal resistance collection end 423 is arranged at the part of the negative electrode tab 8 connected with the negative electrode connecting tab 33, the second internal resistance transmission line 424 is connected with the signal transmission connector 2, the third internal resistance collection end 425 is arranged at the positive electrode connecting tab 32, the third internal resistance transmission line 426 is connected with the signal transmission connector 2, the fourth internal resistance collection end 427 is arranged at the negative electrode connecting tab 33, and the fourth internal resistance transmission line 428 is connected with the signal transmission connector 2. Through the distribution between the internal resistance sensor 42 and the above structural members in the single battery, it is beneficial to comprehensively monitor the change of the internal resistance of the single battery, beneficial to the battery management system to more accurately control the charging and discharging process of the battery, optimize the use efficiency and life of the battery, and improve the reliability of the whole battery system.

[0093] In an embodiment, the monitoring assembly 4 comprises an expansion force sensor 43, which comprises an expansion force collection end 431 and an expansion force transmission line 432 connected with each other; the expansion force collection end 431 is arranged on the side surface of the battery cell assembly 3, and the expansion force transmission line 432 is connected with the signal transmission connector 2.

[0094] Specifically, the expansion force sensor 43 uses its expansion force collection end 431 and expansion force transmission line 432 to monitor the physical changes of the single battery generated in the charging and discharging process. By monitoring the expansion force in real time, the abnormal behavior of the battery can be found in time, so that measures can be taken to prevent serious safety accidents such as thermal runaway.

[0095] Because the battery may generate a large expansion force on the side surface of the battery cell assembly 3 during the charging and discharging process, especially in extreme conditions such as overcharging or internal short circuit, the expansion force sensor 43 is arranged on the side surface of the battery cell assembly 3 in the present application, which can more directly monitor the expansion of the single battery, thereby providing more accurate data; in addition, arranging the expansion force sensor 43 on the side surface of the battery cell assembly 3 can help reduce the interference to other structures of the single battery.

[0096] In an embodiment, the shell 1 comprises a shell body 11 and a cover plate 12 covering the shell body 11; the positive electrode pole 5, the negative electrode pole 6 and the signal transmission connector 2 are arranged on the cover plate 12; and the cover plate 12 is further provided with an explosion-proof valve 9;

[0097] The signal transmission connector 2 is arranged between the explosion-proof valve 9 and the negative electrode pole 6, or between the explosion-proof valve 9 and the positive electrode pole 5;

[0098] The inner end of the signal transmission connector 2 does not protrude from the innermost position of the cover plate 12; specifically, the innermost position of the cover plate 12 is the inner side of the part where the explosion-proof valve 9 is arranged (i.e. the side of the cover plate 12 facing the shell 11).

[0099] Specifically, the assembly structure of the shell 11 and the cover plate 12 forms a sealed accommodation cavity of the electric core assembly 3, which is conducive to protecting the electric core assembly 3 and other structural members in the shell 11.

[0100] The signal transmission connector 2 can be arranged between the explosion-proof valve 9 and the negative electrode post 6, or between the explosion-proof valve 9 and the positive electrode post 5, which helps to optimize the space utilization while ensuring the stability and safety of signal transmission.

[0101] The inner end of the signal transmission connector 2 does not protrude from the innermost position of the cover plate 12, which avoids the additional occupation of the internal height space of the battery by the signal transmission connector 2, does not affect the height of the core pack, and thus does not affect the energy density of the single battery.

[0102] In an embodiment, the signal transmission connector 2 comprises an output terminal 21, a connector 22 and an input terminal 23 connected in sequence.

[0103] The connector 22 is sealingly arranged on the shell 1, and the output terminal 21 is used to connect the battery management system.

[0104] The input terminal 23 is located inside the shell 1, and the inner end of the input terminal 23 does not protrude from the innermost position of the cover plate 12; the monitoring assembly 4 is connected to the input terminal 23.

[0105] Specifically, the output terminal 21 as part of the signal transmission connector 2 can be connected to the corresponding battery management system to transmit the signals monitored inside the single battery; the connector 22 is used to connect the output terminal 21 and the input terminal 23 and ensure that the electrical connection between them is sealed to prevent environmental factors such as moisture or dust from affecting signal transmission; the part of the input terminal 23 located inside the shell 1 is used to receive signals from the monitoring assembly 4 (such as voltage sensor, temperature sensor, internal resistance sensor, swelling force sensor).

[0106] The connector 22 is sealingly arranged on the shell 1 to prevent leakage of the single battery.

[0107] The inner end of the input terminal 23 does not protrude from the innermost position of the cover plate 12, which avoids the additional occupation of the internal height space of the battery by the signal transmission connector 2, does not affect the height of the core pack, and thus does not affect the energy density of the single battery.

[0108] The monitoring assembly 4 is connected to the input terminal 23, that is, the signals monitored by the monitoring assembly 4 are transmitted to the connector 22 through the input terminal 23, and then transmitted to the battery management system through the output terminal 21, so that the real-time monitoring of the changes of various parameters in the single battery is realized.

[0109] Another embodiment of the utility model provides a battery, including a plurality of the single battery.

[0110] Specifically, the plurality of single batteries in the battery include the expansion force sensor 43, a temperature sensor, a voltage sensor, an internal resistance sensor 42, and the monitored internal data of the single battery is transmitted to the battery management system through the signal transmission connector 2, so that the intelligent monitoring of the battery is realized.

[0111] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A single cell, characterized by: The application relates to a battery pack, which comprises a shell (1), a signal transmission connector (2), an electric core assembly (3) and a monitoring assembly (4) for monitoring the health state of the electric core assembly (3). The shell (1) is provided with a positive pole post (5) and a negative pole post (6). The signal transmission connector (2) is arranged on the shell (1) and is in sealed connection with the shell (1). The electric core assembly (3) is arranged in the shell (1) and comprises core packs (31), positive pole connecting pieces (32) and negative pole connecting pieces (33). Each group of the core packs (31) comprises at least one core pack. The positive pole ears (7) of two groups of the core packs are connected with the positive pole connecting pieces (32), the positive pole connecting pieces (32) are connected with the positive pole post (5), the negative pole ears (8) of two groups of the core packs (31) are connected with the negative pole connecting pieces (33), and the negative pole connecting pieces (33) are connected with the negative pole post (6). The monitoring assembly (4) is arranged in the shell (1) and is connected with the signal transmission connector (2). The monitoring assembly (4) comprises a voltage sensor. The voltage sensor comprises voltage collection ends (411) and voltage transmission lines (412). The voltage collection ends (411) are arranged on each group of the core packs (31), at least one of the positive pole ears (7) and the negative pole ears (8) of at least one core pack (31) in one group of the core packs (31) is provided with the voltage collection end (411), and the voltage collection end (411) is connected with the signal transmission connector (2) through the voltage transmission line (412).

2. The cell according to claim 1, wherein: The voltage collection end (411) comprises first voltage collection ends (4111) and second voltage collection ends (4112). The first voltage collection ends (4111) and the second voltage collection ends (4112) are arranged on the positive pole ears (7) farthest from the positive pole connecting pieces (32) in two groups of the core packs (31) respectively. The first voltage collection ends (4111) and the second voltage collection ends (4112) are located on the sides of the corresponding positive pole ears (7) away from the positive pole connecting pieces (32); or The first voltage collection ends (4111) and the second voltage collection ends (4112) are arranged on the negative pole ears (8) farthest from the negative pole connecting pieces (33) in two groups of the core packs (31) respectively. The first voltage collection ends (4111) and the second voltage collection ends (4112) are located on the sides of the corresponding negative pole ears (8) away from the negative pole connecting pieces (33). The voltage transmission line (412) comprises first voltage transmission lines (4121) and second voltage transmission lines (4122). The first voltage collection end (4111) is connected with the signal transmission connector (2) through the first voltage transmission line (4121). The second voltage collection end (4112) is connected with the signal transmission connector (2) through the second voltage transmission line (4122).

3. The cell according to claim 2, wherein: The core packs (31) are 2-8 and even in number; the plurality of core packs (31) are divided into two groups of core packs; Each of the core packs (31) has one or more positive tabs (7) and one or more negative tabs (8); One of the positive tabs (7) of one of the core packs (31) in one group is provided with a first voltage collection end (4111), and one of the positive tabs (7) of one of the core packs (31) in the other group is provided with a second voltage collection end (4112); or, One of the negative tabs (8) of one of the core packs (31) in one group is provided with a first voltage collection end (4111), and one of the negative tabs (8) of one of the core packs (31) in the other group is provided with a second voltage collection end (4112).

4. The cell according to claim 3, wherein: The first voltage collection end (4111) and the second voltage collection end (4112) are connected to one side of the positive tab (7) or the negative tab (8) and are respectively close to the positive tab (7) or the negative tab (8) of the other group of core packs (31).

5. The cell according to claim 1, wherein: The monitoring assembly further comprises a first temperature sensor (44); The first temperature sensor (44) comprises a first temperature collection end (441) and a first temperature transmission line (442) connected to each other; the first temperature collection end (441) is arranged on the side of one group of core packs (31) facing the other group of core packs (31), and the first temperature transmission line (442) is connected to the signal transmission connector (2).

6. The cell of claim 1 wherein: The monitoring assembly comprises a second temperature sensor (45); The second temperature sensor comprises a second temperature collection end (451) and a second temperature transmission line (452) connected to each other; the second temperature collection end (451) is arranged at the part of the positive tab (7) connected to the positive connection piece (32), and the second temperature transmission line (452) is connected to the signal transmission connector (2); and / or, The second temperature sensor (45) comprises a third temperature collection end (453) and a third temperature transmission line (454) connected to each other; the third temperature collection end (453) is arranged at the part of the negative tab (8) connected to the negative connection piece (33), and the third temperature transmission line (454) is connected to the signal transmission connector (2); and / or, The second temperature sensor (45) comprises a fourth temperature collection end (455) and a fourth temperature transmission line (456) connected to each other; the fourth temperature collection end (455) is arranged at the positive connection piece (32), and the fourth temperature transmission line (456) is connected to the signal transmission connector (2); and / or, The second temperature sensor (45) comprises a fifth temperature collection end (457) and a fifth temperature transmission line (458) connected to each other; the fifth temperature collection end (457) is arranged at the negative connection piece (33), and the fifth temperature transmission line (458) is connected to the signal transmission connector (2).

7. The cell according to claim 1, wherein: The monitoring assembly further comprises an internal resistance sensor (42); The internal resistance sensor (42) comprises a first internal resistance collecting end (421) and a first internal resistance transmission line (422) connected with each other; the first internal resistance collecting end (421) is arranged at a part of the positive pole lug (7) connected with the positive pole connecting piece (32), and the first internal resistance transmission line (422) is connected with the signal transmission connector (2); and / or, The internal resistance sensor (42) comprises a second internal resistance collecting end (423) and a second internal resistance transmission line (424) connected with each other; the second internal resistance collecting end (423) is arranged at a part of the negative pole lug (8) connected with the negative pole connecting piece (33), and the second internal resistance transmission line (424) is connected with the signal transmission connector (2); and / or, The internal resistance sensor (42) comprises a third internal resistance collecting end (425) and a third internal resistance transmission line (426) connected with each other; the third internal resistance collecting end (425) is arranged at the positive pole connecting piece (32), and the third internal resistance transmission line (426) is connected with the signal transmission connector (2); and / or, The internal resistance sensor (42) comprises a fourth internal resistance collecting end (427) and a fourth internal resistance transmission line (428) connected with each other; the fourth internal resistance collecting end (427) is arranged at the negative pole connecting piece (33), and the fourth internal resistance transmission line (428) is connected with the signal transmission connector (2). The monitoring assembly (4) comprises an expansion force sensor (43) comprising an expansion force collecting end (431) and an expansion force transmission line (432) connected with each other; the expansion force collecting end (431) is arranged on a side surface of the battery cell assembly (3), and the expansion force transmission line (432) is connected with the signal transmission connector (2).

8. The cell of claim 1 wherein: The shell (1) comprises a shell body (11) and a cover plate (12) covering the shell body (11); the positive pole post (5), the negative pole post (6) and the signal transmission connector (2) are arranged on the cover plate (12); and the cover plate (12) is further provided with an explosion-proof valve (9); The signal transmission connector (2) is arranged between the explosion-proof valve (9) and the negative pole post (6), or between the explosion-proof valve (9) and the positive pole post (5); An inner end of the signal transmission connector (2) does not protrude from an inner side lowest position of the cover plate (12).

9. The cell according to claim 8, wherein: The signal transmission connector (2) comprises an output terminal (21), a connector (22) and an input terminal (23) connected with each other in sequence; The connector (22) is sealingly arranged on the shell (1), and the output terminal (21) is used for connecting a battery management system; The input terminal (23) is located in the shell (1); an inner end of the input terminal (23) does not protrude from an inner side lowest position of the cover plate (12); and the monitoring assembly (4) is connected with the input terminal (23).

10. A battery module, characterized by: The battery comprises a plurality of single batteries as claimed in any one of claims 1-9.

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